1. |
Lisowski P., Jóźwiak-Niedźwiedzka D., Osial M., Bochenek K., Denis P., Glinicki M. A., Power ultrasound-assisted enhancement of granulated blast furnace slag reactivity in cement paste,
CEMENT AND CONCRETE COMPOSITES, ISSN: 0958-9465, DOI: 10.1016/j.cemconcomp.2024.105781, Vol.154, No.105781, pp.1-19, 2024Streszczenie: This paper introduces a first-time investigation into the impact of power ultrasound (PUS)-assisted preparation on the physicochemical and mechanical properties of cement-granulated blast furnace slag (GBFS) composite pastes. Pastes containing deposited GFBS with varying particle size fractions, partially replacing Portland cement, were prepared using PUS (ultrasonic horn tip, 20 kHz, 700 W) in pulse mode in a vertical jacketed glass sonoreactor with closed-circuit cooling. Cement paste incorporating 20 wt.% GBFS as mass substitution with varying particle size fractions was characterized by several physicochemical techniques at different curing ages. Exploring the cement and GBFS interaction induced by PUS, the compressive and flexural strength, the elastic modulus and indentation hardness, the heat of hardening, the mineral composition of hydration products, and the specific surface area BET were evaluated for a curing time of up to 28 days. The grain size distribution of GFBS and the reaction mixture's pH were measured. Both mechanical properties, heat of hydration and nanoporosity exhibited strong sensitivity to PUS treatment. Sonofragmentation of GBFS particles (especially the 125–250 μm fraction) increased with increasing sonication time, resulting in a relative increase of fraction <63 μm and a decrease of fraction >125 μm by 275 % and 60 %, respectively. Using the obtained SEM-EDS data, a simplified mechanism is proposed to explain the effects induced by PUS treatment. Słowa kluczowe: Power ultrasound treatment, Portland cement, Granulated blast furnace slag, Early strength development, C-S-H/C-A-S-H, Seeding effect Afiliacje autorów:
Lisowski P. | - | IPPT PAN | Jóźwiak-Niedźwiedzka D. | - | IPPT PAN | Osial M. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Denis P. | - | IPPT PAN | Glinicki M. A. | - | IPPT PAN |
| | 200p. |
2. |
Psiuk R., Chrzanowska-Giżyńska J.♦, Denis P., Wyszkowska E.♦, Wiśniewska M.♦, Lipińska M.♦, Wojtiuk E.♦, Kurpaska Ł.♦, Smolik J.♦, Mościcki T. P., Microstructural and properties investigations of tantalum-doped tungsten diboride ceramic coatings via HiPIMS and RF magnetron sputtering,
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING, ISSN: 1644-9665, DOI: 10.1007/s43452-024-01050-0, Vol.24, No.239, pp.1-16, 2024Streszczenie: In this work, tantalum-doped tungsten boride ceramic coatings were deposited from a single sputtering target with the radio frequency (RF) and high-power impulse magnetron sputtering (HiPIMS) methods. Two-inch torus targets were synthesised from pure elements with the spark plasma sintering (SPS) method with a stoichiometric composition of W1-xTaxB2.5 (x = 0, 0.08, 0.16, 0.24). Films were deposited with RF and HiPIMS power suppliers at process temperatures from RT to 600 °C. The substrate heating and the energy of the ionised material impacting the substrate increase the surface diffusivity of adatoms and are crucial in the deposition process. The results of SEM and XRD investigations clearly show that the addition of tantalum also changes the microstructure of the deposited films. The coatings without tantalum possess a finer microstructure than those with 24% of tantalum. The structure of films is homogeneous along the film thickness and composed mainly of columns with a (0001) preferred orientation. Deposited coatings are composed mainly of P6/mmm α-WB2 structures. The analysis of nanoindentation results allowed us to determine that ceramic coatings obtained with the HiPIMS method possess hardness above 41 GPa and a ratio of hardness to reduced Young modulus above 0.1. The thickness of HiPIMS-deposited films is relatively small: only around 60% of the RF magnetron sputtered coatings even when the average power input was two times higher. However, it has been shown that the RF coatings require heating the substrate above 400 °C to obtain a crystalline structure, while the HiPIMS method allows for a reduction of the substrate temperature to 300 °C. Słowa kluczowe: RF magnetron sputtering, HiPIMS magnetron sputtering, Superhard ceramic coatings, Transition metal borides, Deposition temperature Afiliacje autorów:
Psiuk R. | - | IPPT PAN | Chrzanowska-Giżyńska J. | - | inna afiliacja | Denis P. | - | IPPT PAN | Wyszkowska E. | - | National Centre for Nuclear Research (PL) | Wiśniewska M. | - | Łukasiewicz Research Network – Metal Forming Institute (PL) | Lipińska M. | - | inna afiliacja | Wojtiuk E. | - | inna afiliacja | Kurpaska Ł. | - | National Centre for Nuclear Research (PL) | Smolik J. | - | inna afiliacja | Mościcki T. P. | - | IPPT PAN |
| | 140p. |
3. |
Bandzerewicz A.♦, Wierzchowski K.♦, Mierzejwska J.♦, Denis P., Gołofit T.♦, Patrycja S.♦, Pilarek M.♦, Gadomska-Gajadhur A.♦, Biological Activity of Poly(1,3-propanediol citrate) Films andNonwovens: Mechanical, Thermal, Antimicrobial, andCytotoxicity Studies,
Macromolecular Rapid Communications, ISSN: 1521-3927, DOI: 10.1002/marc.202300452, Vol.45, pp.1-18, 2024Streszczenie: Polymers are of great interest for medical and cosmeceutical applications. Thecurrent trend is to combine materials of natural and synthetic origin in orderto obtain products with appropriate mechanical strength and goodbiocompatibility, additionally biodegradable and bioresorbable. Citric acid,being an important metabolite, is an interesting substance for the synthesis ofmaterials for biomedical applications. Due to the high functionality of themolecule, it is commonly used in biomaterials chemistry as a crosslinkingagent. Among citric acid-based biopolyesters, poly(1,8-octanediol citrate) isthe best known. It shows application potential in soft tissue engineering. Thiswork focuses on a much less studied polyester, poly(1,3-propanediol citrate).Porous and non-porous materials based on the synthesized polyesters areprepared and characterized, including mechanical, thermal, and surfaceproperties, morphology, and degradation. The main focus is on assessing thebiocompatibility and antimicrobial properties of the materials. Słowa kluczowe: biomaterials, cell cultures, citric acid polyesters, electrospinning Afiliacje autorów:
Bandzerewicz A. | - | inna afiliacja | Wierzchowski K. | - | inna afiliacja | Mierzejwska J. | - | inna afiliacja | Denis P. | - | IPPT PAN | Gołofit T. | - | inna afiliacja | Patrycja S. | - | inna afiliacja | Pilarek M. | - | inna afiliacja | Gadomska-Gajadhur A. | - | Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL) |
| | 100p. |
4. |
Bandzerewicz A.♦, Howis J.♦, Wierzchowski K.♦, Miroslav S.♦, Jiri H.♦, Denis P., Gołofit T.♦, Pilarek M.♦, Gadomska-Gajadhur A.♦, Exploring the application of poly(1,2-ethanediol citrate)/polylactide nonwovens in cell culturing,
Frontiers in Bioengineering and Biotechnology, ISSN: 2296-4185, DOI: 10.3389/fbioe.2024.1332290, Vol.12, pp.1-13, 2024Streszczenie: Biomaterials containing citric acid as a building unit show potential for use as blood vessel and skin tissue substitutes. The success in commercializing implants containing a polymer matrix of poly(1,8-octanediol citrate) provides a rationale for exploring polycitrates based on other diols. Changing the aliphatic chain length of the diol allows functional design strategies to control the implant’s mechanical properties, degradation profile and surface energy. In the present work, poly(1,2-ethanediol citrate) was synthesized and used as an additive to polylactide in the electrospinning process. It was established that the content of polycitrate greatly influences the nonwovens’ properties: an equal mass ratio of polymers resulted in the best morphology. The obtained nonwovens were characterized by surface hydrophilicity, tensile strength, and thermal properties. L929 cell cultures were carried out on their surface. The materials were found to be non-cytotoxic and the degree of porosity was suitable for cell colonization. On the basis of the most important parameters for assessing the condition of cultured cells (cell density and viability, cell metabolic activity and lactate dehydrogenase activity), the potential of PLLA + PECit nonwovens for application in tissue engineering was established. Afiliacje autorów:
Bandzerewicz A. | - | inna afiliacja | Howis J. | - | inna afiliacja | Wierzchowski K. | - | inna afiliacja | Miroslav S. | - | inna afiliacja | Jiri H. | - | inna afiliacja | Denis P. | - | IPPT PAN | Gołofit T. | - | inna afiliacja | Pilarek M. | - | inna afiliacja | Gadomska-Gajadhur A. | - | Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL) |
| | 100p. |
5. |
El-Okaily Mohamed S.♦, Mostafa Amany A.♦, Dulnik J., Denis P., Sajkiewicz P.Ł., Mahmoud Azza A.♦, Dawood R.♦, Maged A.♦, Nanofibrous Polycaprolactone Membrane with Bioactive Glass and Atorvastatin for Wound Healing: Preparation and Characterization,
Pharmaceutics, ISSN: 1999-4923, DOI: 10.3390/pharmaceutics15071990, Vol.15, No.7, pp.1990-1-19, 2023Streszczenie: Skin wound healing is one of the most challenging processes for skin reconstruction, especially after severe injuries. In our study, nanofiber membranes were prepared for wound healing using an electrospinning process, where the prepared nanofibers were made of different weight ratios of polycaprolactone and bioactive glass that can induce the growth of new tissue. The membranes showed smooth and uniform nanofibers with an average diameter of 118 nm. FTIR and XRD results indicated no chemical interactions of polycaprolactone and bioactive glass and an increase in polycaprolactone crystallinity by the incorporation of bioactive glass nanoparticles. Nanofibers containing 5% w/w of bioactive glass were selected to be loaded with atorvastatin, considering their best mechanical properties compared to the other prepared nanofibers (3, 10, and 20% w/w bioactive glass). Atorvastatin can speed up the tissue healing process, and it was loaded into the selected nanofibers using a dip-coating technique with ethyl cellulose as a coating polymer. The study of the in vitro drug release found that atorvastatin-loaded nanofibers with a 10% coating polymer revealed gradual drug release compared to the non-coated nanofibers and nanofibers coated with 5% ethyl cellulose. Integration of atorvastatin and bioactive glass with polycaprolactone nanofibers showed superior wound closure results in the human skin fibroblast cell line. The results from this study highlight the ability of polycaprolactone-bioactive glass-based fibers loaded with atorvastatin to stimulate skin wound healing. Słowa kluczowe: nanofibers, polycaprolactone, bioactive glass, coating, wound healing Afiliacje autorów:
El-Okaily Mohamed S. | - | inna afiliacja | Mostafa Amany A. | - | inna afiliacja | Dulnik J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Sajkiewicz P.Ł. | - | IPPT PAN | Mahmoud Azza A. | - | inna afiliacja | Dawood R. | - | inna afiliacja | Maged A. | - | inna afiliacja |
| | 140p. |
6. |
Skorupska M.♦, Kulczyk M.♦, Denis P., Grzęda D.♦, Czajka A.♦, Ryszkowska J.♦, Structural Hierarchy of PA6 Macromolecules after Hydrostatic Extrusion,
Materials, ISSN: 1996-1944, DOI: 10.3390/ma16093435, Vol.16, No.9, pp.1-18, 2023Streszczenie: This article presents the influence of severe plastic deformation by hydrostatic extrusion (HE) on the thermal and structural properties of polyamide 6 (PA6). During the hydrostatic extrusion process, a fibrous structure oriented along the extrusion direction is formed, which was visualized during microscopic observations. The degree of crystallinity was analyzed by differential scanning calorimetry (DSC). Wide-angle X-ray scattering diffraction (WAXS) analysis was used to partially characterize the PA6 structure after the HE process. The contents of various forms of the crystalline phase in PA6 samples before and after the HE process were analyzed in fragments of spectroscopy in infrared (FTIR). The favorable properties of PA6 after the HE process were obtained after deformation under conditions generating an adiabatic temperature higher than the glass transition temperature and lower than the temperature of the onset of melting of the crystalline phase. Thermal analysis using DSC allowed us to conclude that in the PA6 after the HE process generating deformations in the range of 0.68–1.56, the proportion of the crystalline phase α increases in PA6. As the deformation increases in the HE process, the crystalline phase proportion increases by 12% compared to the initial material (before HE). The glass transition temperature of PA6 is ca. 50.6 °C, reduced for the sample after the HE process at a small deformation of 0.68 (PA6_0.68) to ca. 44.2 °C. For other samples, Tg is ca. 53.2–53.5 °C. As a result of the analysis of WAXS diffractograms of PA6 samples after various deformations in the HE process, the presence of typical peaks of phases α1 and α2 and γ was observed. The results of the FTIR spectroscopic analysis confirm these observations that as the deformation increases, the proportion of the crystalline phase α increases. Słowa kluczowe: hydrostatic extrusion, polyamide 6, structure, thermal properties Afiliacje autorów:
Skorupska M. | - | Institute of High Pressure Physics, Polish Academy of Sciences (PL) | Kulczyk M. | - | inna afiliacja | Denis P. | - | IPPT PAN | Grzęda D. | - | inna afiliacja | Czajka A. | - | inna afiliacja | Ryszkowska J. | - | inna afiliacja |
| | 140p. |
7. |
Psiuk R., Mościcki T., Chrzanowska-Giżyńska J., Kurpaska ♦, Radziejewska J.♦, Denis P., Garbiec D.♦, Chmielewski M.♦, Mechanical and Thermal Properties of W-Ta-B Coatings Deposited by High-Power Impulse Magnetron Sputtering (HiPIMS),
Materials, ISSN: 1996-1944, DOI: 10.3390/ma16020664, Vol.16, No.2, pp.1-12, 2023Streszczenie: We present the deposition and characterization of tungsten-tantalum diboride (W,Ta)B2 coatings prepared by the high-power impulse magnetron sputtering technique. We evaluated the influence of pulse duration and substrate bias on the properties of (W,Ta)B2 films. A high hardness of up to 35 GPa measured by nanoindentation was simultaneously obtained with good elastic properties. Changing the pulse duration greatly affected the B/(W+Ta) atomic ratio, which influenced the properties of the coatings. The deposited films are thermally stable at up to 1000 ◦C in vacuum and are able to withstand oxidation at 500 ◦C. Słowa kluczowe: tungsten diboride, high power impulse magnetron sputtering (HiPIMS), hardness, thermal stability, oxidation resistance Afiliacje autorów:
Psiuk R. | - | IPPT PAN | Mościcki T. | - | IPPT PAN | Chrzanowska-Giżyńska J. | - | IPPT PAN | Kurpaska | - | National Centre for Nuclear Research (PL) | Radziejewska J. | - | inna afiliacja | Denis P. | - | IPPT PAN | Garbiec D. | - | Metal Forming Institute, Poznań (PL) | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) |
| | 140p. |
8. |
Miętus M.♦, Kolankowski K.♦, Gołofit T.♦, Denis P., Bandzerewicz A.♦, Spychalski M.♦, Mąkosa-Szczygieł M.♦, Pilarek M.♦, Wierzchowski K.♦, Gadomska-Gajadhur A.♦, From Poly(glycerol itaconate) Gels to Novel Nonwoven Materials for Biomedical Applications,
Gels, ISSN: 2310-2861, DOI: 10.3390/gels9100788, Vol.9, No.788, pp.1-19, 2023Streszczenie: Electrospinning is a process that has attracted significant interest in recent years. It provides the opportunity to produce nanofibers that mimic the extracellular matrix. As a result, it is possible to use the nonwovens as scaffolds characterized by high cellular adhesion. This work focused on the synthesis of poly(glycerol itaconate) (PGItc) and preparation of nonwovens based on PGItc gels and polylactide. PGItc gels were synthesized by a reaction between itaconic anhydride and glycerol. The use of a mixture of PGItc and PLA allowed us to obtain a material with different properties than with stand-alone polymers. In this study, we present the influence of the chosen ratios of polymers and the OH/COOH ratio in the synthesized PGItc on the properties of the obtained materials. The addition of PGItc results in hydrophilization of the nonwovens’ surface without disrupting the high porosity of the fibrous structure. Spectral and thermal analyzes are presented, along with SEM imagining. The preliminary cytotoxicity research showed that nonwovens were non-cytotoxic materials. It also helped to pre-determine the potential application of PGItc + PLA nonwovens as subcutaneous tissue fillers or drug delivery systems. Słowa kluczowe: poly(glycerol itaconate), polylactide, electrospinning, tissue engineering, hydrogels Afiliacje autorów:
Miętus M. | - | inna afiliacja | Kolankowski K. | - | inna afiliacja | Gołofit T. | - | inna afiliacja | Denis P. | - | IPPT PAN | Bandzerewicz A. | - | Politechnika Warszawska (PL) | Spychalski M. | - | inna afiliacja | Mąkosa-Szczygieł M. | - | inna afiliacja | Pilarek M. | - | inna afiliacja | Wierzchowski K. | - | inna afiliacja | Gadomska-Gajadhur A. | - | Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL) |
| | 20p. |
9. |
Nakielski P., Rinoldi C., Pruchniewski M.♦, Pawłowska S., Gazińska M.♦, Strojny B.♦, Rybak D., Jezierska-Woźniak K.♦, Urbanek O., Denis P., Sinderewicz E.♦, Czelejewska W.♦, Staszkiewicz-Chodor J.♦, Grodzik M.♦, Ziai Y., Barczewska M.♦, Maksymowicz W.♦, Pierini F., Laser-assisted fabrication of injectable nanofibrous cell carriers,
Small, ISSN: 1613-6810, DOI: 10.1002/smll.202104971, Vol.18, No.2, pp.2104971-1-18, 2022Streszczenie: The use of injectable biomaterials for cell delivery is a rapidly expanding field which may revolutionize the medical treatments by making them less invasive. However, creating desirable cell carriers poses significant challenges to the clinical implementation of cell-based therapeutics. At the same time, no method has been developed to produce injectable microscaffolds (MSs) from electrospun materials. Here the fabrication of injectable electrospun nanofibers is reported on, which retain their fibrous structure to mimic the extracellular matrix. The laser-assisted micro-scaffold fabrication has produced tens of thousands of MSs in a short time. An efficient attachment of cells to the surface and their proliferation is observed, creating cell-populated MSs. The cytocompatibility assays proved their biocompatibility, safety, and potential as cell carriers. Ex vivo results with the use of bone and cartilage tissues proved that NaOH hydrolyzed and chitosan functionalized MSs are compatible with living tissues and readily populated with cells. Injectability studies of MSs showed a high injectability rate, while at the same time, the force needed to eject the load is no higher than 25 N. In the future, the produced MSs may be studied more in-depth as cell carriers in minimally invasive cell therapies and 3D bioprinting applications. Afiliacje autorów:
Nakielski P. | - | IPPT PAN | Rinoldi C. | - | IPPT PAN | Pruchniewski M. | - | inna afiliacja | Pawłowska S. | - | IPPT PAN | Gazińska M. | - | inna afiliacja | Strojny B. | - | inna afiliacja | Rybak D. | - | IPPT PAN | Jezierska-Woźniak K. | - | inna afiliacja | Urbanek O. | - | IPPT PAN | Denis P. | - | IPPT PAN | Sinderewicz E. | - | inna afiliacja | Czelejewska W. | - | inna afiliacja | Staszkiewicz-Chodor J. | - | inna afiliacja | Grodzik M. | - | inna afiliacja | Ziai Y. | - | IPPT PAN | Barczewska M. | - | University of Warmia and Mazury in Olsztyn (PL) | Maksymowicz W. | - | University of Warmia and Mazury in Olsztyn (PL) | Pierini F. | - | IPPT PAN |
| | 200p. |
10. |
Mościcki T., Chrzanowska-Giżyńska J., Psiuk R., Denis P., Mulewska K.♦, Kurpaska Ł.♦, Chmielewski M.♦, Wiśniewska M.♦, Garbiec D.♦, Thermal and mechanical properties of (W,Zr)B2-z coatings deposited by RF magnetron sputtering method,
International Journal of Refractory Metals and Hard Materials, ISSN: 0263-4368, DOI: 10.1016/j.ijrmhm.2022.105811, Vol.105, pp.105811-1-8, 2022Streszczenie: Magnetron sputtered WB2 coatings doped with 8, 11 and 16 at.% zirconium were analysed using energy dispersive spectroscopy, X-ray diffraction and nanoindentation under the load of 4, 7 and 10 mN. It has been observed that these coatings crystallize in the α-AlB2 and ω-W2B5 prototype structure. Phenomenon responsible for this is an increase of the zirconium content which causes an increase in the ω-W2B5 phase. All the deposited coatings have a hardness of about 45 GPa while Young's modulus drops down from 497 to 480 GPa with increasing zirconium content. Coatings without doping and doped with 16 at.% zirconium were annealed at 650 °C and subjected to cyclic thermal loads using a maximum temperature 600 °C and cooling with a compressed air. It has been observed that addition of zirconium improved coatings phase stability. Słowa kluczowe: superhard coatings, tungsten diboride, zirconia doping, magnetron sputtering, cycling thermal loads, annealing Afiliacje autorów:
Mościcki T. | - | IPPT PAN | Chrzanowska-Giżyńska J. | - | IPPT PAN | Psiuk R. | - | IPPT PAN | Denis P. | - | IPPT PAN | Mulewska K. | - | National Centre for Nuclear Research (PL) | Kurpaska Ł. | - | National Centre for Nuclear Research (PL) | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) | Wiśniewska M. | - | Łukasiewicz Research Network – Metal Forming Institute (PL) | Garbiec D. | - | Metal Forming Institute, Poznań (PL) |
| | 140p. |
11. |
Jain A., Michalska M.♦, Zaszczyńska A., Denis P., Surface modification of activated carbon with silver nanoparticles for electrochemical double layer capacitors,
Journal of Energy Storage, ISSN: 2352-152X, DOI: 10.1016/j.est.2022.105367, Vol.54, pp.105367-1-9, 2022Streszczenie: In the present work, we report the synthesis of surface modified activated carbon (AC). The surface of the activated carbon have been modified by using silver nanoparticles. The synthesis process is simple, cost effective and environment friendly. The modified-AC powders have been characterized by using X-ray diffraction, scanning electron microscopy and surface area and pore size measurements. The electrochemical performance of the prepared materials have been tested by fabricating symmetric configuration of EDLC by using magnesium-ion based polymer electrolytes. The cells have been tested by using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge technique. AC with 3 wt% of silver presents best results with specific capacitance of the order of 398 F g−1 energy density and power density of 55 Wh kg−1 and 2.4 kW kg−1 making it an interesting material for supercapacitor application. Słowa kluczowe: supercapacitor, activated carbon-silver composite, gel polymer electrolyte, electrochemical studies Afiliacje autorów:
Jain A. | - | IPPT PAN | Michalska M. | - | Łukasiewicz Research Network‒Institute of Electronic Materials Technology (PL) | Zaszczyńska A. | - | IPPT PAN | Denis P. | - | IPPT PAN |
| | 100p. |
12. |
Jóźwiak-Niedźwiedzka D., Dąbrowski M., Dziedzic K., Jarząbek D., Antolik A., Denis P., Glinicki M.A., Effect of gamma irradiation on the mechanical properties of carbonation reaction products in mortar,
MATERIALS AND STRUCTURES, ISSN: 1359-5997, DOI: 10.1617/s11527-022-02003-w, Vol.55, pp.164-1-17, 2022Streszczenie: Prediction of carbonation progress in concrete exposed to ionizing radiation is important for the durability assessment of nuclear power plants, eventually needed for operational license extension. The objective of this work is to reveal the influence of gamma irradiation on the carbonation development and resulting microstructural features of cement mortar. The composition of mortar was varied by using mineral additions. Canned specimens at elevated CO2 concentration environment were exposed to gamma irradiation up to the absorbed dose of 1.6 MGy in the vicinity of spent nuclear fuel rods in pool of research reactor. Micromechanical properties of carbonation reaction products were determined using nanoindentation tests. The carbonation depth was found to increase with increasing absorbed γ dose. The size of calcite crystals was about three times greater in irradiated specimens. Gamma irradiation improved the micromechanical properties of carbonation products. Effects of mineral additives on the characteristics of irradiated mortar are discussed. Słowa kluczowe: calcite, carbonation, cement mortar, gamma irradiation, microstructure, mineral additions, nanoindentation Afiliacje autorów:
Jóźwiak-Niedźwiedzka D. | - | IPPT PAN | Dąbrowski M. | - | IPPT PAN | Dziedzic K. | - | IPPT PAN | Jarząbek D. | - | IPPT PAN | Antolik A. | - | IPPT PAN | Denis P. | - | IPPT PAN | Glinicki M.A. | - | IPPT PAN |
| | 100p. |
13. |
Psiuk R., Milczarek M., Jenczyk P., Denis P., Jarząbek D., Bazarnik P.♦, Pisarek M.♦, Mościcki T., Improved mechanical properties of W-Zr-B coatings deposited by hybrid RF magnetron – PLD method,
APPLIED SURFACE SCIENCE, ISSN: 0169-4332, DOI: 10.1016/j.apsusc.2021.151239, Vol.570, pp.151239-1-11, 2021Streszczenie: In this work, novel W-Zr-B coatings were developed by a hybrid process combining pulsed laser deposited ZrB2 and radio frequency magnetron sputtered W2B5. The influence of the laser power density on the structure and mechanical properties of the deposited films was studied. Addition of zirconium causes a change in the structure of the deposited films from columnar to mainly amorphous. The nanoindentation tests and compression of nanopillars showed that doped W-Zr-B layers are still super-hard and incompressible in comparison to WB2 films without doping, but they change their behaviour from brittle to ductile. Films obtained with a fluence of 1.06 J/cm2 are superhard (H = 40 ± 4 GPa) and incompressible (12 ± 1 GPa), but possess a relatively low Young’s modulus (E = 330 ± 32 GPa) and a high elastic recovery (We = 0.9). Further increase in the fluence causes films to consist of deeply embedded fragments of laser ablated ZrB2 target in the deposited layer. Taking into account that the particles are made of ZrB2 which possess extraordinary thermal properties, and the matrix is made of W-Zr-B, a super-hard material, such a composite can also be interesting for industrial applications. Słowa kluczowe: superhard tungsten borides, hybrid magnetron sputtering – pulsed laser deposition, nanopillar compression Afiliacje autorów:
Psiuk R. | - | IPPT PAN | Milczarek M. | - | IPPT PAN | Jenczyk P. | - | IPPT PAN | Denis P. | - | IPPT PAN | Jarząbek D. | - | IPPT PAN | Bazarnik P. | - | Politechnika Warszawska (PL) | Pisarek M. | - | Institute of Physical Chemistry, Polish Academy of Sciences (PL) | Mościcki T. | - | IPPT PAN |
| | 140p. |
14. |
Fantilli A.P.♦, Jóźwiak-Niedźwiedzka D., Denis P., Bio-fibres as a reinforcement of gypsum composites,
Materials, ISSN: 1996-1944, DOI: 10.3390/ma14174830, Vol.14, No.17, pp.4830-1-14, 2021Streszczenie: Three series of tests performed on fibre-reinforced gypsum composites are described herein. Sheep wool fibres and hemp fibres were used as reinforcement. The aim was to evaluate the capability of these biomaterials to enhance the fracture toughness of the gypsum matrix. The mechanical properties were measured by means of flexural tests on small specimens, whereas scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction were used to analyse the microstructure and composition of the fibres and of the gypsum composites. As a result, wool fibres were shown to improve the mechanical performance of the gypsum matrix, better than hemp fibres. This is due to the high adhesion at the interface of the fibre and gypsum matrix, because the latter tends to roughen the surface of the wool and, consequently to increase the bond strength. This preliminary research carried out shows that this type of biofiber—a waste material—can be considered a promising building material in sustainable and environmentally friendly engineering. Słowa kluczowe: organic waste material, fibre-reinforced gypsum, mechanical properties, microstructure Afiliacje autorów:
Fantilli A.P. | - | Politecnico di Torino (IT) | Jóźwiak-Niedźwiedzka D. | - | IPPT PAN | Denis P. | - | IPPT PAN |
| | 140p. |
15. |
Kaczmarek A., Denis P., Krajewski M., Mościcki T., Małolepszy A.♦, Hoffman J., Improved laser ablation method for the production of luminescent carbon particles in liquids,
Materials, ISSN: 1996-1944, DOI: 10.3390/ma14092365, Vol.14, No.9, pp.2365-1-17, 2021Streszczenie: An improved method for the production of luminescent carbon nanoparticles is proposed in this work. The new method overcomes the disadvantages of commonly used approaches. It involves two-stage laser ablation in water and in aqueous solutions, where the first stage is the laser ablation of a graphite target and the second is the shredding of particles produced in the first step. The two-stage method offers the optimization of the laser pulse fluence for the performance of each process. It was found that the two-stage process of laser ablation allows producing photoluminescent carbon structures in pure water. The additional reagent may be added either in the first or second stage. The first stage performed in pure water allows avoiding the contamination of the target. Moreover, it simplifies the identification of the origin of photoluminescence. Two synthesis routes for the preparation of carbon nanoparticles by the proposed method using pure water as well as urea aqueous solution are investigated. It was found that the use of urea as a reagent results in luminescence properties similar to those obtained with other more hazardous amine-based reagents. The influence of the synthesis approach and process parameters on the structural and luminescent properties of nanoparticles is also explored in this work. Słowa kluczowe: pulsed laser ablation in liquid, carbon nanoparticles, photoluminescent particles Afiliacje autorów:
Kaczmarek A. | - | IPPT PAN | Denis P. | - | IPPT PAN | Krajewski M. | - | IPPT PAN | Mościcki T. | - | IPPT PAN | Małolepszy A. | - | Politechnika Warszawska (PL) | Hoffman J. | - | IPPT PAN |
| | 140p. |
16. |
Garbiec D.♦, Wiśniewska M.♦, Psiuk R., Denis P., Levintant-Zayonts N., Leshchynsky V.♦, Rubach R.♦, Mościcki T., Zirconium alloyed tungsten borides synthesized by spark plasma sintering,
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING, ISSN: 1644-9665, DOI: 10.1007/s43452-021-00188-5, Vol.21, pp.37-1-15, 2021Streszczenie: Tungsten borides (WBx; x = 2.5 or 4.5) with an increasing substitution of tungsten by zirconium from 0 to 24 at.% were synthesized by spark plasma sintering (SPS) for the first time. The influence of the holding time (2.5–30 min) on the densification behavior, microstructure evolution and development of the properties of W–Zr–B compounds were studied. The samples were characterized using scanning electron microscopy (SEM) for microstructure analysis, X-ray diffraction (XRD) for phase identification, Vickers micro-indentation for microhardness measurements, tribological tests to determine the coefficient of friction and specific wear rate, as well as measurements of electrical conductivity. The XRD results confirm the presence of the WB4 phase in the microstructure, despite the high sintering temperature (1800 °C) and small overstoichiometric excess of boron (4.5) addition in the sintered samples. This is caused by the high heating rate (400 °C/min), short holding time (2.5 min) and addition of zirconium. The Vickers hardness (HV) values measured at 1 N are 24.8 ± 2.0 and 26.6 ± 1.8 GPa for 24 at.% zirconium in WB2.5 and for 0 at.% zirconium in WB4.5, respectively. In addition, the hardest sample (W0.76Zr0.24B2.5) showed electrical conductivity up to 3.961·10^6 S/m, which is similar to WC–Co cemented carbides. The friction and wear test results reveal the formation of a boron-based film which seems to play the role of a solid lubricant. Afiliacje autorów:
Garbiec D. | - | Metal Forming Institute, Poznań (PL) | Wiśniewska M. | - | Łukasiewicz Research Network – Metal Forming Institute (PL) | Psiuk R. | - | IPPT PAN | Denis P. | - | IPPT PAN | Levintant-Zayonts N. | - | IPPT PAN | Leshchynsky V. | - | inna afiliacja | Rubach R. | - | inna afiliacja | Mościcki T. | - | IPPT PAN |
| | 140p. |
17. |
Wrzecionek M.♦, Bandzerewicz A.♦, Dutkowska E.♦, Dulnik J., Denis P., Gadomska-Gajadhur A.♦, Poly(glycerol citrate)-polylactide nonwovens toward tissue engineering applications,
Polymers for Advanced Technologies, ISSN: 1042-7147, DOI: 10.1002/pat.5407, Vol.32, No.10, pp.3955-3966, 2021Streszczenie: In 2002, Robert Langer proposed that new polyester for tissue engineering should have good mechanical properties followed by: covalent bonding (as crosslinking) and hydrogen-bonding interactions; and should be elastic like rubber materials due to three-dimensional network structure. Considering these hypotheses, a polyester made of glycerol and citric acid was designed in this work. Poly(glycerol citrate) should be attractive for tissue engineering because both glycerol and citric acid, taking part in natural human metabolic pathways; and due to the reactant's functionality, 3D networks should be produced easily. Moreover, the reagents are cheap, available, and often used in the food and pharmaceutical industries. In this work, poly(glycerol citrate) was synthesized and then used with PLA for creating porous nonwovens by electrospinning. Produced materials were tested for possible application in the field of tissue engineering. The obtained materials have properties similar to collagen fibers, but still, require refinement for medical applications. Słowa kluczowe: electrospinning, poly(glycerol citrate), polylactide, tissue engineering Afiliacje autorów:
Wrzecionek M. | - | Politechnika Warszawska (PL) | Bandzerewicz A. | - | Politechnika Warszawska (PL) | Dutkowska E. | - | Politechnika Warszawska (PL) | Dulnik J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Gadomska-Gajadhur A. | - | Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL) |
| | 70p. |
18. |
Węglewski W., Krajewski M., Bochenek K., Denis P., Wysmołek A.♦, Basista M., Anomalous size effect in thermal residual stresses in pressure sintered alumina-chromium composites,
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2019.138111, Vol.762, pp.138111-1-10, 2019Streszczenie: This paper explores an anomalous size effect in thermal residual stresses occurring in the alumina matrix of Al2O3/Cr sintered composite upon varying the particle size of the chromium reinforcement. When a coarse chromium powder (45 µm mean particle size) is used the average residual stress in the alumina phase after cooling is compressive in accordance with the classical Eshelby solution. However, in the case of a fine chromium (5 µm mean particle size) it switches to tension. This effect, detected by photoluminescence piezospectroscopy, is also confirmed by X-ray and neutron diffraction experiments. As the classical micromechanics models are incapable to capture it, a finite element model is developed with the actual composite microstructure being reconstructed from the microtomography images. It is shown by numerical simulations that the anomalous size effect is associated with the complex microstructure of the composite fabricated with the fine chromium powder. It is also pointed out that the temperature dependence of the coefficients of thermal expansion of the matrix and the reinforcement affects the residual stress levels. Słowa kluczowe: thermal residual stress, metal-ceramic composites, size effect, microcomputed tomography, finite element analysis Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Krajewski M. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Denis P. | - | IPPT PAN | Wysmołek A. | - | Uniwersytet Warszawski (PL) | Basista M. | - | IPPT PAN |
| | 140p. |
19. |
Chrzanowska-Giżyńska J., Denis P., Giżyński M.♦, Kurpaska Ł.♦, Mihailescu I.♦, Ristoscu C.♦, Szymański Z., Mościcki T., Thin WBx and WyTi1−yBx films deposited by combined magnetron sputtering and pulsed laser deposition technique,
APPLIED SURFACE SCIENCE, ISSN: 0169-4332, DOI: 10.1016/j.apsusc.2019.02.006, Vol.478, pp.505-513, 2019Streszczenie: The coatings of tungsten borides (WBx) and tungsten borides doped with titanium (WyTi1−yBx) were deposited by using combined magnetron sputtering - pulsed laser deposition technique. In the case of WBx coatings, pure tungsten target was evaporated by a laser pulse at 1064 nm wavelength and pure boron target was sputtered by a magnetron. In the case of WyTi1−yBx coatings, the W2B5 target was sputtered by the magnetron and titanium target was evaporated by the laser pulse at 1064 nm wavelength. The content of titanium dopant changed from 1.1 to 5.5 at.%. The microstructure, chemical and phase composition of deposited coatings were investigated by means of Scanning Electron Microscopy, Energy Dispersive X-Ray Spectroscopy, X-Ray Photoelectron Spectroscopy and X-Ray Diffractometry, respectively. The Vickers hardness and Young's modulus were determined by using the nanoindentation test. Nanocrystalline WB coatings with dominant WB2 phase were obtained at a substrate temperature of 520 °C. The coatings were superhard with a hardness of 47–50 GPa and the mean value of surface roughness was <6 nm. The WBx coatings doped with 5.5 at.% Ti had hardness similar to the coatings sputtered by magnetron from W2B5 target. Słowa kluczowe: The superhard WyBx thin films was deposited with hybrid laser-magnetron technology, The MS-PLD method allows for the deposition of ternary borides such as WyTi1−yBx, The MS-PLD method enables to control the chemical and phase composition of films, The deposited films are smooth with hardness above 50 GPa, Crystalline films were deposited only on a substrate kept an elevated temperature Afiliacje autorów:
Chrzanowska-Giżyńska J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Giżyński M. | - | Politechnika Warszawska (PL) | Kurpaska Ł. | - | National Centre for Nuclear Research (PL) | Mihailescu I. | - | National Institute for Lasers, Plasma and Radiation Physics (RO) | Ristoscu C. | - | National Institute for Lasers, Plasma and Radiation Physics (RO) | Szymański Z. | - | IPPT PAN | Mościcki T. | - | IPPT PAN |
| | 140p. |
20. |
Denis P., Wrzecionek M.♦, Gadomska‐Gajadhur A.♦, Sajkiewicz P., Poly(glycerol sebacate)–poly(l-lactide) nonwovens. Towards attractive electrospun material for tissue engineering,
Polymers, ISSN: 2073-4360, DOI: 10.3390/polym11122113, Vol.11, No.12, pp.2113-1-26, 2019Streszczenie: Two types of poly(glycerol sebacate) (PGS) prepolymers were synthesized and electrospun with poly(l-lactic acid) (PLA), resulting in bicomponent nonwovens. The obtained materials were pre-heated in a vacuum, at different times, to crosslink PGS and investigate morphological and structural dependencies in that polymeric, electrospun system. As both PGS and PLA are sensitive to pre-heating (crosslinking) conditions, research concerns both components. More interest is focused on the properties of PGS, considering further research for mechanical properties and subsequent experiments with PGS synthesis. Electrospinning of PGS blended with PLA does not bring difficulties, but obtaining elastomeric properties of nonwovens is problematic. Even though PGS has many potential advantages over other polyesters when soft tissue engineering is considered, its full utilization via the electrospinning process is much harder in practice. Further investigations are ongoing, especially with the promising PGS prepolymer with a higher esterification degree and its variations. Słowa kluczowe: electrospinning, degradable polymers, synthesis, structure, crosslinking Afiliacje autorów:
Denis P. | - | IPPT PAN | Wrzecionek M. | - | Politechnika Warszawska (PL) | Gadomska‐Gajadhur A. | - | Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL) | Sajkiewicz P. | - | IPPT PAN |
| | 100p. |
21. |
Jenczyk P., Gawrońska M.♦, Dera W., Chrzanowska-Giżyńska J., Denis P., Jarząbek D.M., Application of SiC particles coated with a protective Ni layer for production of Ni/SiC co-electrodeposited composite coatings with enhanced tribological properties,
CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2019.08.063, Vol.45, No.17B, pp.23540-23547, 2019Streszczenie: In this paper, the mechanical properties of composites consisting of electroplated Ni and co-electrodeposited SiC particles, coated with a thin protective layer of Ni, were studied. The protective layer was on the SiC particles prior to adding them to the electrolyte bath. It was demonstrated that due to the application of the protective layer it was possible to decrease sliding friction force, and improve the wear resistance, of the composite coatings in comparison with standard electroplated composite coatings made of Ni and co-electrodeposited pure SiC particles. Coating SiC particles with Ni was achieved by means of a PVD process. The main advantage of this step is avoiding oxidation of the surface of the particles during the contact with an electrolyte. Particles protected from oxidation lead to stronger interfacial bonding between the matrix and the reinforcement. Furthermore, better bonding protects the SiC particles from being extracted from the matrix by a counter-probe during friction and wear tests. The influence of the particle's concentration is studied. A smaller friction force and constant wear rate was observed. Słowa kluczowe: wear, friction, interfacial bonding strength, metal matrix composites, silicon carbide, electrodeposited nickel Afiliacje autorów:
Jenczyk P. | - | IPPT PAN | Gawrońska M. | - | Politechnika Warszawska (PL) | Dera W. | - | IPPT PAN | Chrzanowska-Giżyńska J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Jarząbek D.M. | - | IPPT PAN |
| | 100p. |
22. |
Kołbuk D., Urbanek O., Denis P., Choińska E.♦, Sonochemical coating as an effective method of polymeric nonwovens functionalization,
Journal of Biomedical Materials Research Part A, ISSN: 1549-3296, DOI: 10.1002/jbm.a.36751, Vol.107, No.11, pp.2447-2457, 2019Streszczenie: A surface of polymeric nonwovens may be coated with various types of nanoparticles for medical applications, filtration, and so forth. However, quite often methods used for surface modification are difficult to scale up or are not applicable for polymers. In this article, we present one-step process enabling nonwovens functionalization. Poly(l-lactide-co-glicolide) (PLGA) nonwovens were prepared by electrospinning process and coated with hydroxyapatite nanoparticles (HAp) using ultrasonic processing. The effect of the process was evaluated with various techniques. HAp layer was successfully attached without loss of structural properties of HAp or PLGA nonwovens. The analysis confirmed the decrease of hydrophobicity of coated nonwoven, as well as its biocompatibility, making this material valuable from the perspective of medical applications. The sonochemical functionalization of polymeric nonwovens may be considered as an effective and economic method, enhancing surface properties of electrospun nonwovens for various applications. Słowa kluczowe: lectrospinning, fibrous composites, nanoparticles, surface modification, ultrasonic treatment Afiliacje autorów:
Kołbuk D. | - | IPPT PAN | Urbanek O. | - | IPPT PAN | Denis P. | - | IPPT PAN | Choińska E. | - | Politechnika Warszawska (PL) |
| | 100p. |
23. |
Misztal-Faraj B., Pęcherski R.B., Denis P., Jarecki L., Modeling of oriented crystallization kinetics of polymers in the entire range of uniaxial molecular orientation,
POLYMER, ISSN: 0032-3861, DOI: 10.1016/j.polymer.2019.04.037, Vol.173, pp.141-157, 2019Streszczenie: Closed-form analytical formulas describing kinetics of oriented crystallization under constant or variable amorphous orientation and isothermal or non-isothermal conditions are derived, valid in the whole range of orientation. Master relation for the deformation free energy vs. orientation factor, or tensile stress, is derived accounting for non-linear effects of finite chain extensibility. The Avrami-Evans model is expanded to account for the effects of orientation in thermodynamic driving force of nucleation and crystal growth. Involvement of predetermined and spontaneous nucleation varies strongly with the orientation and leads to domination of spontaneous nucleation at high orientations. Crystallization half-time involving separated or coexisting predetermined and spontaneous nucleation is discussed. A formula predicting equal contribution of both nucleation modes vs. orientation factor and temperature is derived and ranges of domination of the modes are discussed. Example computations illustrate the model predictions for an example polymer (PLLA) and are in good agreement with the experimental results. Słowa kluczowe: amorphous orientation, oriented crystallization kinetics, nucleation rate Afiliacje autorów:
Misztal-Faraj B. | - | IPPT PAN | Pęcherski R.B. | - | IPPT PAN | Denis P. | - | IPPT PAN | Jarecki L. | - | IPPT PAN |
| | 100p. |
24. |
Enayati M.S.♦, Neisiany R.E.♦, Sajkiewicz P., Behzad T.♦, Denis P., Pierini F., Effect of nanofiller incorporation on thermomechanical and toughness of poly (vinyl alcohol)-based electrospun nanofibrous bionanocomposites,
Theoretical and Applied Fracture Mechanics, ISSN: 0167-8442, DOI: 10.1016/j.tafmec.2018.11.006, Vol.99, pp.44-50, 2019Streszczenie: The current work studies the electrospun poly (vinyl alcohol) (PVA) nanofibers and its nanocomposites including nanohydroxy apatite (nHAp) and nHAp/cellulose nanofibers (CNFs), emphasizing the impact of nanofillers on the toughness of nanofibers. PVA nanofibers were incorporated with 10 wt% of nHAp and then various amounts of CNF were added to subsequent PVA/nHAp fibrous nanocomposites. The morphology of nonwoven mats was studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). While neat PVA nanofibers were smooth and uniform in thickness, the nanofiller loading resulted in thinner fibers with less uniformity. Furthermore, the thermal properties of the nonwoven network of fibers were characterized employing thermogravimetric analysis (TGA). Although the maximum loss mass temperature of PVA was partially reduced upon addition of nanofillers, the onset of decomposition was not altered. The mechanical characterizations were performed using static tensile and dynamic mechanical analysis (DMA). Compared to neat PVA mats, the tensile test of nanocomposites mats demonstrated the significant increase in Young's modulus; however, strain at break was dramatically reduced. In addition, the fracture work was assessed from the area under the stress-strain curve, which showed brittleness of fibrous nanocomposites due to the nanofiller incorporation. Field emission SEM (FE-SEM) was employed to scan the fracture surface of stretched fibers. The increase in modulus of electrospun mats was also shown by DMA in frequency mode. In parallel, both tensile test and DMA confirmed the change in fracture of PVA fibers from a tough to brittle mode, due to the nanofiller addition. Słowa kluczowe: electrospun nanocomposites, nanofillers, toughness, mechanical properties Afiliacje autorów:
Enayati M.S. | - | Isfahan University of Technology (IR) | Neisiany R.E. | - | Isfahan University of Technology (IR) | Sajkiewicz P. | - | IPPT PAN | Behzad T. | - | Isfahan University of Technology (IR) | Denis P. | - | IPPT PAN | Pierini F. | - | IPPT PAN |
| | 100p. |
25. |
Chrzanowska-Giżyńska J., Denis P., Woźniacka S., Kurpaska Ł.♦, Mechanical properties and thermal stability of tungsten boride films deposited by radio frequency magnetron sputtering,
CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2018.07.208, Vol.44, No.16, pp.19603-19611, 2018Streszczenie: Tungsten and boron compounds belong to the group of superhard materials since their hardness could exceed 40 GPa. In this study, the properties of the tungsten boride WBx coatings deposited by radio frequency magnetron sputtering were investigated. The sputtering was performed from specially prepared targets that were composed of boron and tungsten mixed in a molar ratio of 2.5 and sintered in Spark Plasma Sintering (SPS) process. WB films were deposited on silicon (100) and stainless steel 304 substrates at temperatures of 23 ÷ 770 °C. Microstructure, chemical and phase composition were investigated by using Scanning Electron Microscope (SEM), X-Ray Photoelectron Spectroscopy (XPS) and X-Ray Diffraction (XRD), respectively. The mechanical properties like Vickers hardness and Young's modulus were obtained by using nanoindentation test at a load of 5 ÷ 100 mN. The friction coefficient and wear resistance of αWB coatings were investigated in scratch test and reciprocal sliding wear instrumentation. Moreover, in order to investigate thermal properties, the αWB films were annealed at 1000 °C in argon/air for 1 h and at 250 °C for 2 h in air atmosphere. Results of our research confirm that αWB coatings can be considered as an alternative to superhard materials in the production of wear resistant, long-lasting tools. Słowa kluczowe: Hard coatings, Hard materials, Magnetron sputtering, Mechanical properties, Thermal properties, Tungsten boride Afiliacje autorów:
Chrzanowska-Giżyńska J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Woźniacka S. | - | IPPT PAN | Kurpaska Ł. | - | National Centre for Nuclear Research (PL) |
| | 40p. |
26. |
Dulnik J., Kołbuk D., Denis P., Sajkiewicz P., The effect of a solvent on cellular response to PCL/gelatin and PCL/collagen electrospun nanofibres,
EUROPEAN POLYMER JOURNAL, ISSN: 0014-3057, DOI: 10.1016/j.eurpolymj.2018.05.010, Vol.104, pp.147-156, 2018Streszczenie: Bicomponent polycaprolactone/gelatin and polycaprolactone/collagen fibres were formed by electrospinning using two kinds of solvents: a representative of commonly used solvents with this polymer composition, highly toxic hexafluoroisopropanol (HFIP) and alternative, less harmful one, the mixture of acetic (AA) and formic (FA) acids. Both material types were subjected to investigations of structure and in-vitro cellular activity. Viscosity and Fourier transform infrared spectroscopy (FTIR) measurements shown that the type of solvent used influences the structure of solution and conformation of polymer molecules. In-vitro quantitative tests as well as cell culture morphology observations proved that materials electrospun with the use of 'green' solvents can yield similar results to those obtained by made with toxic ones. Slightly better cellular response to materials electrospun from HFIP can be explained by relatively well dispersed components within the fibre and more expanded conformation of molecules, resulting in better exposition of RGD (Arg-Gly-Asp) binding sites to cells' integrin receptors. Słowa kluczowe: Cellular tests, Electrospinning, Biopolymers, Viscosity, Solvents Afiliacje autorów:
Dulnik J. | - | IPPT PAN | Kołbuk D. | - | IPPT PAN | Denis P. | - | IPPT PAN | Sajkiewicz P. | - | IPPT PAN |
| | 35p. |
27. |
Chrzanowska-Giżyńska J., Denis P., Hoffman J., Giżyński M.♦, Mościcki T., Garbiec D.♦, Szymański Z., Tungsten borides layers deposited by a nanosecond laser pulse,
SURFACE AND COATINGS TECHNOLOGY, ISSN: 0257-8972, DOI: 10.1016/j.surfcoat.2017.12.040, Vol.335, pp.181-187, 2018Streszczenie: Tungsten borides belong to the group of potentially superhard materials which hardness could be compared to cubic boron nitride and diamond. However, difficulty in fabrication of single phase material using conventional methods is the main drawback of this group of ceramics. In order to overcome this problem material can be deposited as a thin layer e.g. in the pulsed laser deposition process. In this paper, the effect of laser wavelength and energy density of nanosecond Nd:YAG laser on the WBx-type layers were analyzed using wavelengths 355 and 1064 nm with the energy density of laser beam from 1.7 to 5 J/cm2 and from 1.7 to 9.3 J/cm2, respectively. The WB2.5 and WB4.5 targets synthesized in Spark Plasma Sintering process were used and the layers were deposited onto Si (100) substrate heated to a temperature of 570 °C. Layers' microstructure were analyzed using X-ray Diffraction and scanning electron microscope equipped with energy dispersive X-ray spectrometer. Change of laser wavelength and energy density resulted in variations of the chemical composition and morphology of deposited layers. Finally, W2B-βWB, αWB-WB-WB3 and WB3, and boron layers were deposited wherein WB3 structure is formed in a wide range of laser fluences and at both investigated wavelength. Next, WB3 layers were investigated in the indentation test at a load of 5–30 mN and its hardness was up to 50 ± 10 GPa Słowa kluczowe: Pulsed laser deposition, Super-hard materials, Tungsten borides, Tungsten triboride Afiliacje autorów:
Chrzanowska-Giżyńska J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Hoffman J. | - | IPPT PAN | Giżyński M. | - | Politechnika Warszawska (PL) | Mościcki T. | - | IPPT PAN | Garbiec D. | - | Metal Forming Institute, Poznań (PL) | Szymański Z. | - | IPPT PAN |
| | 35p. |
28. |
Dulnik J., Denis P., Sajkiewicz P., Kołbuk D., Choińska E.♦, Biodegradation of bicomponent PCL/gelatin and PCL/collagen nanofibers electrospun from alternative solvent system,
Polymer Degradation and Stability, ISSN: 0141-3910, DOI: 10.1016/j.polymdegradstab.2016.05.022, Vol.130, pp.10-21, 2016Streszczenie: Bicomponent polycaprolactone/gelatin and polycaprolactone/collagen nanofibers formed by electrospinning using various solvents were subjected to biodegradation and compared. Hexafluoroisopropanol (HFIP) was used as a reference solvent, while the second, alternative solvent system was the mixture of acetic acid (AA) with formic acid (FA). Biodegradation of investigated materials was manifested mainly by the gelatin leaching, including collagen which is indeed denaturated to gelatin during electrospinning, leading to nanofibers erosion. There was no molecular degradation of PCL during 90 days of biodegradation procedure as deduced from no change in the elongation stress at break. The rate of biopolymer leaching was very fast from all materials during the first 24 h of biodegradation, being related to surface leaching, followed by a slower rate leaching from deeper material layers. Mass measurements showed much faster biopolymer leaching from nanofibers electrospun from AA/FA than from HFIP because of strongly emulsive nature of the solution in the former case. Irrespective of the solvent used, the leaching rate increased with initial content of gelatin. The analysis of Young modulus during biodegradation indicated complex mechanism of changes, including biopolymer mass loss, increase of PCL crystallinity and partial gelatin renaturation. Słowa kluczowe: Bicomponent nanofibers, Biodegradation, Biopolymer Afiliacje autorów:
Dulnik J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Sajkiewicz P. | - | IPPT PAN | Kołbuk D. | - | IPPT PAN | Choińska E. | - | Politechnika Warszawska (PL) |
| | 35p. |
29. |
Chrzanowska J., Hoffman J., Denis P., Giżyński M.♦, Mościcki T., The effect of process parameters on rhenium diboride films deposited by PLD,
SURFACE AND COATINGS TECHNOLOGY, ISSN: 0257-8972, DOI: 10.1016/j.surfcoat.2015.07.024, Vol.277, pp.15-22, 2015Streszczenie: Rhenium diboride (ReB2) thin films have been deposited by a nanosecond pulsed laser deposition method on Si (100) substrate heated to 570°C. The coatings were formed in the ablation process of SPS sintered ReB2 target. The effect of laser wavelength, energy density and postannealing on the films' properties was studied. Investigated wavelengths were 355 and 1064 nm of Nd:YAG nanosecond laser. Laser beam energy density varied from 2.1 to 6.1 J cm− 2 and from 4.1 to 9.4 J cm− 2 at 355 and 1064 nm, respectively. Layer thickness was of the order of several hundred nanometres. Deposition efficiency increases with an energy density in quasi linear way and strongly grows for shorter wavelength. The layers consist of two characteristic microstructures: a smooth basis and stick debris (typical diameters of several hundred nanometres). Lower energy density of laser beam and longer wavelength favour dominance of smooth basis and minimization of debris. The XRD analysis of all samples indicate the crystalline ReB2 with preferred (002) orientation and fine grain size of about 20 nm. Shorter wavelength and higher energy density foster stronger (002) orientation. Moreover, an annealing right after the deposition (25 min in 350°C) causes minimization of degree of orientation and decrease of hardness. The Vickers hardness of ReB2 films is at about 60 GPa and is reduced to about 40 GPa after the annealing process. Deposition efficiency and physical and chemical structures of layers produced under variety of conditions were studied and compared. Słowa kluczowe: Ceramics ablation, Pulsed laser deposition, Rhenium diboride, ReB2 optical properties, Super-hard films, Wavelength influence Afiliacje autorów:
Chrzanowska J. | - | IPPT PAN | Hoffman J. | - | IPPT PAN | Denis P. | - | IPPT PAN | Giżyński M. | - | Politechnika Warszawska (PL) | Mościcki T. | - | IPPT PAN |
| | 35p. |
30. |
Denis P., Dulnik J., Sajkiewicz P., Electrospinning and Structure of Bicomponent Polycaprolactone/Gelatin Nanofibers Obtained Using Alternative Solvent System,
International Journal of Polymeric Materials and Polymeric Biomaterials, ISSN: 0091-4037, DOI: 10.1080/00914037.2014.945208, Vol.64, No.7, pp.354-364, 2015Streszczenie: Bicomponent polycaprolactone/gelatin (PCL/Gt) nanofibers were successfully formed for the first time by electrospinning using a novel polymer–solvent system with solvents being alternative to the commonly used toxic solvents like fluorinated alcohols. The mixture of acetic acid (AA) with formic acid (FA; 90:10) was applied. Stable electrospinning was possible despite the fact the mixture of PCL and gelatin in AA/FA solvent showed emulsive structure. From the practical perspective, there is no doubt that it is possible to obtain PCL/Gt fibers using AA/FA mixture with morphology similar to that for fibers spun from hexafluoroisopropanol (HFIP) solutions. Słowa kluczowe: Alternative solvents, electrospinning, gelatin, nanofibers, polycaprolactone, structure Afiliacje autorów:
Denis P. | - | IPPT PAN | Dulnik J. | - | IPPT PAN | Sajkiewicz P. | - | IPPT PAN |
| | 25p. |
31. |
Sajkiewicz P., Brzeska J.♦, Denis P., Sikorska W.♦, Kowalczuk M.♦, Rutkowska M.♦, The preliminary studies of a structure and electrospinning of new polyurethanes based on synthetic atactic poly[(R, S)-3-hydroxybutyrate],
BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.2478/bpasts-2014-0006, Vol.62, No.1, pp.55-60, 2014Streszczenie: Novel polyurethanes based on synthetic, atactic poly[(R, S)-3-hydroxybutyrate] (a-PHB) and polycaprolactone (PCL) or polyoxytetramethylene (PTMG) diols were synthesized. It was shown that the presence of a-PHB within soft segments reduces crystallinity of PUR. Because of the low melting temperature for polyurethanes with PCL in soft segments, at this stage of work, electrospinning was limited to polyurethanes containing PTMG and a-PHB. Polyurethane containing 80% of PTMG and 20% of a-PHB was electrospun at various parameters from hexafluoro-2-propanole solution, resulting in formation of fibers with the average diameter ca. 2 μm. The fiber diameter decreased with decreasing polymer concentration in a solution and was practically insensitive to the needle-collector distance in the applied range of distances. Słowa kluczowe: polyurethane, polyhydroxybutyrate, electrospinning, scaffolds Afiliacje autorów:
Sajkiewicz P. | - | IPPT PAN | Brzeska J. | - | inna afiliacja | Denis P. | - | IPPT PAN | Sikorska W. | - | Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL) | Kowalczuk M. | - | inna afiliacja | Rutkowska M. | - | inna afiliacja |
| | 25p. |
32. |
Jóźwiak-Niedźwiedzka D., Brandt A.M.♦, Gibas K., Denis P., The alkali - aggregate reaction hazard in the case of barite concretes,
CEMENT, WAPNO, BETON, ISSN: 1425-8129, Vol.19, No.4, pp.234-242, 2014Streszczenie: Concretes for the shields against ionizing radiation should be executed with particular care to satisfy all requirements, not only effective attenuation of different radiation but also sufficient durability. In the paper fundamental problems are presented that are related with designing of such protective concretes in order to avoid alkali-aggregate reaction. The results of preliminary investigations are presented that indicate how to select barite aggregate and to define composition of concrete mix. Present knowledge in that area of materials engineering should be completed before initiation of construction of nuclear power stations at industrial scale in Poland. Słowa kluczowe: Alkali Aggregate Reaction (AAR), heavy aggregate, ionizing radiation Afiliacje autorów:
Jóźwiak-Niedźwiedzka D. | - | IPPT PAN | Brandt A.M. | - | inna afiliacja | Gibas K. | - | IPPT PAN | Denis P. | - | IPPT PAN |
| | 15p. |
33. |
Kołbuk D., Sajkiewicz P., Denis P., Choińska E.♦, Investigations of polycaprolactone/gelatin blends in terms of their miscibility,
BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.2478/bpasts-2013-0066, Vol.61, No.3, pp.629-632, 2013Streszczenie: Synthetic and natural polymers blends represent a new brand of materials with application in wound healing, scaffolds or drug delivery systems. Polycaprolactone/gelatin (PCL/Gt) blends were analyzed in terms of their miscibility. The PCL structure was investigated as a function of Gt content. Changes in the PCL spherulitic structure with Gt content were investigated by a polarizing-interference microscope. The analysis of the glass transition temperature (Tg) of both components as a function of PCL/Gt ratio by differential scanning calorimetry indicates that the system of polycaprolactone/gelatin belongs to a type of s.c. compatible system, being intermediate between miscible and immiscible systems. There is possibility of very limited miscibility of both components. Supplementary wide angle X-ray scattering results are presented. Słowa kluczowe: lends, compatibility, miscibility, polycaprolactone, gelatin Afiliacje autorów:
Kołbuk D. | - | IPPT PAN | Sajkiewicz P. | - | IPPT PAN | Denis P. | - | IPPT PAN | Choińska E. | - | Politechnika Warszawska (PL) |
| | 25p. |