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This paper aims to explain the phenomenon of laser light trapping (LLT) in a 3D polymer gel dosimeter. A VIC-T polymer gel dosimeter containing 17% N-vinylpyrrolidone, 8% N,N′-methylenebisacrylamide, 12% tert-butyl alcohol, 5% gelatine, 0.02% hydroquinone and 14 mM tetrakis(hydroxymethyl)phosphonium chloride was used in this study. It was exposed to green laser light with a wavelength of 532 nm. A film was recorded during the exposure. After exposure, Raman spectroscopy was used to study the reactions taking place inside the dosimeter. The obtained results were used to explain what the LLT phenomenon is, what are the consequences for the dosimeter in which such a phenomenon occurs, and what dosimeter components play an important role in the occurrence of LLT. In addition, the conditions under which 3D polymer gel dosimeters can be measured using optical computed tomography at short wavelengths of visible laser light are indicated.
Marek Kozicki; Malwina Jaszczak; Mariusz Dudek; Piotr Maras. Laser Light Trapping Phenomenon in a 3D Radiotherapy Polymer Gel Dosimeter. Materials 2021, 14, 3961 .
AMA StyleMarek Kozicki, Malwina Jaszczak, Mariusz Dudek, Piotr Maras. Laser Light Trapping Phenomenon in a 3D Radiotherapy Polymer Gel Dosimeter. Materials. 2021; 14 (14):3961.
Chicago/Turabian StyleMarek Kozicki; Malwina Jaszczak; Mariusz Dudek; Piotr Maras. 2021. "Laser Light Trapping Phenomenon in a 3D Radiotherapy Polymer Gel Dosimeter." Materials 14, no. 14: 3961.
This study compared the tribological properties in nano- and millinewton load ranges of Ti‑6Al-4V surfaces that were modified using self-assembled monolayers (SAMs) of carboxylic and phosphonic acids. The effectiveness of the creation of SAMs with the use of the liquid phase deposition (LPD) technique was monitored by the contact angle measurement, the surface free energy (SFE) calculation, X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR) measurements. The obtained results indicated that more stable and well-ordered layers, which were characterized by the lowest values of the coefficient of friction, adhesion, and wear rate, were obtained using phosphonic acid as a surface modifier. Based on the obtained results, it was found that the Ti-6Al-4V alloy modified by phosphonic acid would be the most advantageous for practical applications, especially in micro- and nanoelectromechanical systems (MEMS/NEMS).
Michal Cichomski; Milena Prowizor; Dorota Anna Kowalczyk; Andrzej Sikora; Damian Batory; Mariusz Dudek. Comparison of the Physicochemical Properties of Carboxylic and Phosphonic Acid Self-Assembled Monolayers Created on a Ti-6Al-4V Substrate. Materials 2020, 13, 5137 .
AMA StyleMichal Cichomski, Milena Prowizor, Dorota Anna Kowalczyk, Andrzej Sikora, Damian Batory, Mariusz Dudek. Comparison of the Physicochemical Properties of Carboxylic and Phosphonic Acid Self-Assembled Monolayers Created on a Ti-6Al-4V Substrate. Materials. 2020; 13 (22):5137.
Chicago/Turabian StyleMichal Cichomski; Milena Prowizor; Dorota Anna Kowalczyk; Andrzej Sikora; Damian Batory; Mariusz Dudek. 2020. "Comparison of the Physicochemical Properties of Carboxylic and Phosphonic Acid Self-Assembled Monolayers Created on a Ti-6Al-4V Substrate." Materials 13, no. 22: 5137.
The presented article shows the influence of concentration of perfluoroalkylsilanes in solutions on tribological properties of self-assembled monolayers (SAMs) deposited on three surfaces with different silicon content in the millinewton load range. The SAMs were created using the liquid phase deposition (LPD) method with 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (FDTS) and (3, 3, 3-trifluoropropyl) trichlorosilane (FPTS) solutions, for which viscosity and surface tension were estimated. Deposited layers were analyzed in terms of thickness, coverage, wettability, structure and coefficient of friction. The obtained results demonstrated that SAMs created on the silicon-incorporated diamond-like carbon (Si-DLC) coatings possess the best microtribological properties. Systems composed of perfluoroalkylsilane SAM structures deposited on Si-DLC coatings are highly promising candidates as material for microelectromechanical applications.
Michał Cichomski; Ewelina Borkowska; Milena Prowizor; Damian Batory; Anna Jedrzejczak; Mariusz Dudek. The Effect of Physicochemical Properties of Perfluoroalkylsilanes Solutions on Microtribological Features of Created Self-Assembled Monolayers. Materials 2020, 13, 3357 .
AMA StyleMichał Cichomski, Ewelina Borkowska, Milena Prowizor, Damian Batory, Anna Jedrzejczak, Mariusz Dudek. The Effect of Physicochemical Properties of Perfluoroalkylsilanes Solutions on Microtribological Features of Created Self-Assembled Monolayers. Materials. 2020; 13 (15):3357.
Chicago/Turabian StyleMichał Cichomski; Ewelina Borkowska; Milena Prowizor; Damian Batory; Anna Jedrzejczak; Mariusz Dudek. 2020. "The Effect of Physicochemical Properties of Perfluoroalkylsilanes Solutions on Microtribological Features of Created Self-Assembled Monolayers." Materials 13, no. 15: 3357.
The a-C:H:TiOx coating deposited by radio-frequency plasma-enhanced chemical vapor deposition (RF PECVD) method, using methane and titanium (IV) isopropoxide mixture atmosphere, was post-deposition annealed at 400 °C in the atmosphere of air. Phase composition and coating structure were studied in detail by Raman spectroscopy, X-ray diffraction and transmission electron microscopy. Depending on the duration of the annealing process, two stages of transformation were identified. In the first stage, during the first 30 min of annealing, processes related to the degradation of a carbon matrix occurred. Characteristic bands attributed to carbon coatings disappeared in Raman spectra and hardness decreased from 10 GPa measured for the as-deposited coating to 2.7 GPa. In the second stage, after additional 10 min of annealing, the coating transformed into a crystalline TiO2 in which two polymorphs (anatase and srilankite) coexisted.
A. Jedrzejczak; D. Batory; M. Cichomski; A. Miletic; M. Czerniak-Reczulska; P. Niedzielski; Mariusz Dudek. Formation of anatase and srilankite mixture as a result of the thermally induced transformation of the a-C:H:TiOx coating. Surface and Coatings Technology 2020, 400, 126230 .
AMA StyleA. Jedrzejczak, D. Batory, M. Cichomski, A. Miletic, M. Czerniak-Reczulska, P. Niedzielski, Mariusz Dudek. Formation of anatase and srilankite mixture as a result of the thermally induced transformation of the a-C:H:TiOx coating. Surface and Coatings Technology. 2020; 400 ():126230.
Chicago/Turabian StyleA. Jedrzejczak; D. Batory; M. Cichomski; A. Miletic; M. Czerniak-Reczulska; P. Niedzielski; Mariusz Dudek. 2020. "Formation of anatase and srilankite mixture as a result of the thermally induced transformation of the a-C:H:TiOx coating." Surface and Coatings Technology 400, no. : 126230.
New materials that are as similar as possible in terms of structure and biology to the extracellular matrix (external environment) of cells are of great interest for regenerative medicine. Oligoproline and oligohydroxyproline derivatives (peptides 2–5) are potential mimetics of collagen fragments. Peptides 2–5 have been shown to be similar to the model collagen fragment (H-Gly-Hyp-Pro-Ala-Hyp-Pro-OH, 1) in terms of both their spatial structure and biological activity. In this study, peptides 2–5 were covalently bound to nonwovens based on chitosan and calcium alginate. Incorporation of the peptides was confirmed by Fourier transform -infrared (FT-IR) and zeta potential measurements. Biological studies (cell metabolic activity by using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test and Live/Dead assay) proved that the obtained peptide-polysaccharide conjugates were not toxic to the endothelial cell line EA.hy 926. In many cases, the conjugates had a highly affirmative influence on cell proliferation. The results of this study show that conjugates of chitosan and calcium alginate with oligoproline and oligohydroxyproline derivatives have potential for use in regenerative medicine.
Joanna Wasko; Justyna Fraczyk; Angelika Becht; Zbigniew J. Kaminski; Sandra Flinčec Grgac; Anita Tarbuk; Marta Kaminska; Mariusz Dudek; Eulalia Gliscinska; Zbigniew Draczynski; Beata Kolesinska. Conjugates of Chitosan and Calcium Alginate with Oligoproline and Oligohydroxyproline Derivatives for Potential Use in Regenerative Medicine. Materials 2020, 13, 3079 .
AMA StyleJoanna Wasko, Justyna Fraczyk, Angelika Becht, Zbigniew J. Kaminski, Sandra Flinčec Grgac, Anita Tarbuk, Marta Kaminska, Mariusz Dudek, Eulalia Gliscinska, Zbigniew Draczynski, Beata Kolesinska. Conjugates of Chitosan and Calcium Alginate with Oligoproline and Oligohydroxyproline Derivatives for Potential Use in Regenerative Medicine. Materials. 2020; 13 (14):3079.
Chicago/Turabian StyleJoanna Wasko; Justyna Fraczyk; Angelika Becht; Zbigniew J. Kaminski; Sandra Flinčec Grgac; Anita Tarbuk; Marta Kaminska; Mariusz Dudek; Eulalia Gliscinska; Zbigniew Draczynski; Beata Kolesinska. 2020. "Conjugates of Chitosan and Calcium Alginate with Oligoproline and Oligohydroxyproline Derivatives for Potential Use in Regenerative Medicine." Materials 13, no. 14: 3079.
Different microstructures were created on the surface of a polycrystalline diamond plate (obtained by microwave plasma-enhanced chemical vapor deposition—MW PECVD process) by use of a nanosecond pulsed DPSS (diode pumped solid state) laser with a 355 nm wavelength and a galvanometer scanning system. Different average powers (5 to 11 W), scanning speeds (50 to 400 mm/s) and scan line spacings (“hatch spacing”) (5 to 20 µm) were applied. The microstructures were then examined using scanning electron microscopy, confocal microscopy and Raman spectroscopy techniques. Microstructures exhibiting excellent geometry were obtained. The precise geometries of the microstructures, exhibiting good perpendicularity, deep channels and smooth surfaces show that the laser microprocessing can be applied in manufacturing diamond microfluidic devices. Raman spectra show small differences depending on the process parameters used. In some cases, the diamond band (at 1332 cm−1) after laser modification of material is only slightly wider and shifted, but with no additional peaks, indicating that the diamond is almost not changed after laser interaction. Some parameters did show that the modification of material had occurred and additional peaks in Raman spectra (typical for low-quality chemical vapor deposition CVD diamond) appeared, indicating the growing disorder of material or manufacturing of the new carbon phase.
Mariusz Dudek; Adam Rosowski; Marcin Kozanecki; Malwina Jaszczak; Witold Szymański; Martin Sharp; Anna Karczemska. Microstructures Manufactured in Diamond by Use of Laser Micromachining. Materials 2020, 13, 1199 .
AMA StyleMariusz Dudek, Adam Rosowski, Marcin Kozanecki, Malwina Jaszczak, Witold Szymański, Martin Sharp, Anna Karczemska. Microstructures Manufactured in Diamond by Use of Laser Micromachining. Materials. 2020; 13 (5):1199.
Chicago/Turabian StyleMariusz Dudek; Adam Rosowski; Marcin Kozanecki; Malwina Jaszczak; Witold Szymański; Martin Sharp; Anna Karczemska. 2020. "Microstructures Manufactured in Diamond by Use of Laser Micromachining." Materials 13, no. 5: 1199.
Advanced 3D dosimetry is required for verifications of complex dose distributions in modern radiotherapy. Two 3D polymer gel dosimeters, coupled with magnetic resonance (MR) imaging (3 T MRI) readout and data processing with polyGeVero® software, were tested for the verification of calculated 3D dose distributions by a treatment planning system (TPS) and ArcCHECK®-3DVH®, related to eradication of a lung tumour. N-vinylpyrrolidone-containing 3D polymer gel dosimeters were used: VIC (containing ascorbic acid and copper sulfate pentahydrate) and VIC-T (containing tetrakis(hydroxymethyl)phosphonium chloride). Three remote centers were involved in the dosimeters preparation and irradiation (Poland), and MRI (Austria). Cross beam calibration of the dosimeters and verification of a 3D dose distribution calculated with an Eclipse External Beam TPS and ArcCHECK®-3DVH® were performed. The 3D-to-3D comparisons of the VIC and VIC-T with TPS and ArcCHECK®-3DVH® along with ArcCHECK®-3DVH® versus TPS dose matrixes were performed with the aid of the polyGeVero® by analyzing dose profiles, isodoses lines, gamma index, gamma angle, dose difference, and related histograms. The measured MR-relaxation rate (R2 = 1/T2) for the dosimeters relates to the dose, as follows: R2 = 0.0928 ± 0.0008 [Gy-1 s-1] × D [Gy] + 2.985 ± 0.012 [s-1] (VIC) and 0.1839 ± 0.0044 [Gy-1 s-1] × D [Gy] + 2.519 ± 0.053 [s-1] (VIC-T). The 3D-to-3D comparisons revealed a good agreement between the measured and calculated 3D dose distributions. VIC and VIC-T with 3T MRI readout and polyGeVero® showed potential for verifications of calculated irradiation plans. The results obtained suggest the implementation of the irradiation plan for eradication of the lung tumour.
Marek Kozicki; Andreas Berg; Piotr Maras; Malwina Jaszczak; Mariusz Dudek. Clinical radiotherapy application of N-vinylpyrrolidone-containing 3D polymer gel dosimeters with remote external MR-reading. Physica Medica 2020, 69, 134 -146.
AMA StyleMarek Kozicki, Andreas Berg, Piotr Maras, Malwina Jaszczak, Mariusz Dudek. Clinical radiotherapy application of N-vinylpyrrolidone-containing 3D polymer gel dosimeters with remote external MR-reading. Physica Medica. 2020; 69 ():134-146.
Chicago/Turabian StyleMarek Kozicki; Andreas Berg; Piotr Maras; Malwina Jaszczak; Mariusz Dudek. 2020. "Clinical radiotherapy application of N-vinylpyrrolidone-containing 3D polymer gel dosimeters with remote external MR-reading." Physica Medica 69, no. : 134-146.
This paper presents properties of TiOx-DLC (titanium oxides incorporated diamond like carbon) coatings deposited by RF PECVD (Radio Frequency Plasma Enhanced Chemical Vapour Deposition) method using combination of methane (CH4) and titanium(IV) isopropoxide (Ti[OCH(CH3)2]4) atmospheres. The obtained results show that the deposition process of TiOx-DLC coatings is strongly affected by the concentration of TTIP (titanium (IV) isopropoxide) precursor in working atmosphere. The proposed technology allows to obtain TiOx-DLC coatings with Ti concentration up to 10 at.%. Higher concentrations of Ti in the coating (5 and 10 at.%) result in twice the concentration of oxygen. As the results of the investigation it was noticed, stable TiOx-DLC coatings showing acceptable hardness and residual stress, as well as good optical properties contain up to 1.5 at.% of Ti and can be deposited at 400 V of the negative self-bias using 0.05 of TTIP partial pressure ratio.
Anna Jedrzejczak; Damian Batory; Milena Prowizor; Magdalena Dominik; Mateusz Smietana; Michal Cichomski; Aneta Kisielewska; Witold Szymanski; Witold Kozlowski; Mariusz Dudek. Titanium(IV) isopropoxide as a source of titanium and oxygen atoms in carbon based coatings deposited by Radio Frequency Plasma Enhanced Chemical Vapour Deposition method. Thin Solid Films 2020, 693, 137697 .
AMA StyleAnna Jedrzejczak, Damian Batory, Milena Prowizor, Magdalena Dominik, Mateusz Smietana, Michal Cichomski, Aneta Kisielewska, Witold Szymanski, Witold Kozlowski, Mariusz Dudek. Titanium(IV) isopropoxide as a source of titanium and oxygen atoms in carbon based coatings deposited by Radio Frequency Plasma Enhanced Chemical Vapour Deposition method. Thin Solid Films. 2020; 693 ():137697.
Chicago/Turabian StyleAnna Jedrzejczak; Damian Batory; Milena Prowizor; Magdalena Dominik; Mateusz Smietana; Michal Cichomski; Aneta Kisielewska; Witold Szymanski; Witold Kozlowski; Mariusz Dudek. 2020. "Titanium(IV) isopropoxide as a source of titanium and oxygen atoms in carbon based coatings deposited by Radio Frequency Plasma Enhanced Chemical Vapour Deposition method." Thin Solid Films 693, no. : 137697.
The tribological properties of diamond like carbon (DLC) and silicon-incorporated diamond like carbon (Si-DLC) coatings in contact with Si3N4 counterbody were investigated using a ball-on-disc tribometer. The effect of modification by perfluoro and alkylphosphonic self-assembled monolayers was evaluated in terms of lowering the coefficient of friction (CoF) and wear rate. The tribological tests revealed that the presence of silicon decreases the CoF and slightly increases the wear rate of Si-DLC coatings in comparison with DLC. Further decrease of CoF was achieved for Si-DLC coatings after self-assembled monolayers deposition. The effectiveness of modification, stability on ultraviolet (UV) irradiation and characterization of all coatings was monitored by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Raman spectroscopy and measurements of the surface free energy (SFE). The obtained study demonstrated that self-assembled monolayers reduce friction and are highly promising candidates as a good lubricant for tribological and mechanical systems.
Michal Cichomski; Aneta Kisielewska; Milena Prowizor; Ewelina Borkowska; Ireneusz Piwoński; Mariusz Dudek; Anna Jedrzejczak; Damian Batory. The influence of self-assembled monolayers on tribological properties of Si-DLC coatings. Surface Topography: Metrology and Properties 2019, 7, 045006 .
AMA StyleMichal Cichomski, Aneta Kisielewska, Milena Prowizor, Ewelina Borkowska, Ireneusz Piwoński, Mariusz Dudek, Anna Jedrzejczak, Damian Batory. The influence of self-assembled monolayers on tribological properties of Si-DLC coatings. Surface Topography: Metrology and Properties. 2019; 7 (4):045006.
Chicago/Turabian StyleMichal Cichomski; Aneta Kisielewska; Milena Prowizor; Ewelina Borkowska; Ireneusz Piwoński; Mariusz Dudek; Anna Jedrzejczak; Damian Batory. 2019. "The influence of self-assembled monolayers on tribological properties of Si-DLC coatings." Surface Topography: Metrology and Properties 7, no. 4: 045006.
M Kozicki; Malwina Jaszczak; P Maras; Mariusz Dudek. A chemical evolution of NVP-containing VIPAR-family 3D polymer gel dosimeters – a brief overview. Journal of Physics: Conference Series 2019, 1305, 1 .
AMA StyleM Kozicki, Malwina Jaszczak, P Maras, Mariusz Dudek. A chemical evolution of NVP-containing VIPAR-family 3D polymer gel dosimeters – a brief overview. Journal of Physics: Conference Series. 2019; 1305 ():1.
Chicago/Turabian StyleM Kozicki; Malwina Jaszczak; P Maras; Mariusz Dudek. 2019. "A chemical evolution of NVP-containing VIPAR-family 3D polymer gel dosimeters – a brief overview." Journal of Physics: Conference Series 1305, no. : 1.
M Kozicki; Malwina Jaszczak; K Kwiatos; P Maras; S Kadlubowski; Radoslaw Wach; Mariusz Dudek. Three-dimensional radiochromic and polymer gel dosimeters with Pluronic F-127 matrix – a review of current research. Journal of Physics: Conference Series 2019, 1305, 1 .
AMA StyleM Kozicki, Malwina Jaszczak, K Kwiatos, P Maras, S Kadlubowski, Radoslaw Wach, Mariusz Dudek. Three-dimensional radiochromic and polymer gel dosimeters with Pluronic F-127 matrix – a review of current research. Journal of Physics: Conference Series. 2019; 1305 ():1.
Chicago/Turabian StyleM Kozicki; Malwina Jaszczak; K Kwiatos; P Maras; S Kadlubowski; Radoslaw Wach; Mariusz Dudek. 2019. "Three-dimensional radiochromic and polymer gel dosimeters with Pluronic F-127 matrix – a review of current research." Journal of Physics: Conference Series 1305, no. : 1.
The diamond-like carbon (DLC) coatings containing 1.6%, 5.3% and 9.4 at.% of Ti deposited by the radio frequency plasma enhanced chemical vapor deposition (RF PECVD) method on the silicon substrate were modified by n-decylphosphonic acid (DP) and 1H, 1H, 2H and 2H-perfluorodecylphosphonic acid (PFDP). The presence of perfluoro and alkylphosphonic self-assembled monolayers prepared by the liquid phase deposition (LPD) technique was confirmed by Fourier transform infrared spectroscopy (FTIR). It was shown that DP and PFDP monolayers on the surface of titanium incorporated diamond-like carbon (Ti-DLC) coatings had a huge influence on their wettability, friction properties, stability under phosphate- and tris-buffered saline solutions and on antimicrobial activity. It was also found that the dispersive component of surface free energy (SFE) had a significant influence on the value of the friction coefficient and the percentage value of the growth inhibition of bacteria. The dispersive component of SFE caused a reduction in the growth of bacteria and the friction coefficient in mili- and nano-newton load range. Additionally, both self-assembled monolayers prepared on Ti-DLC coatings strongly reduced bacterial activity by up to 95% compared to the control sample.
Michal Cichomski; Milena Prowizor; Ewelina Borkowska; Ireneusz Piwoński; Anna Jędrzejczak; Mariusz Dudek; Damian Batory; Natalia Wrońska; Katarzyna Lisowska. Impact of Perfluoro and Alkylphosphonic Self-Assembled Monolayers on Tribological and Antimicrobial Properties of Ti-DLC Coatings. Materials 2019, 12, 2365 .
AMA StyleMichal Cichomski, Milena Prowizor, Ewelina Borkowska, Ireneusz Piwoński, Anna Jędrzejczak, Mariusz Dudek, Damian Batory, Natalia Wrońska, Katarzyna Lisowska. Impact of Perfluoro and Alkylphosphonic Self-Assembled Monolayers on Tribological and Antimicrobial Properties of Ti-DLC Coatings. Materials. 2019; 12 (15):2365.
Chicago/Turabian StyleMichal Cichomski; Milena Prowizor; Ewelina Borkowska; Ireneusz Piwoński; Anna Jędrzejczak; Mariusz Dudek; Damian Batory; Natalia Wrońska; Katarzyna Lisowska. 2019. "Impact of Perfluoro and Alkylphosphonic Self-Assembled Monolayers on Tribological and Antimicrobial Properties of Ti-DLC Coatings." Materials 12, no. 15: 2365.
This work reports results related to the manufacturing and optimisation of a leuco crystal violet (LCV)-Pluronic F-127 radiochromic gel dosimeter suitable for 3D radiotherapy dosimetry. A feature of this gel is that the natural gelatine polymer, which is most often used as a matrix in 3D dosimeters, is substituted with Pluronic F-127 synthetic copolymer (poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide). Pluronic F-127 ensures a higher transparency than gelatine, which may be beneficial for optical computed tomography readout, and improves the thermal properties in the temperature range above ~30 °C at which the gelatine physical gel converts to a solution. The optimal composition obtained comprises 2 mM LCV, 4 mM 4-(1,1,3,3-tetramethylbutyl)phenyl-polyethylene glycol (Triton X-100), 17 mM trichloroacetic acid (TCAA) and 25% Pluronic F-127. Its main dose-response features are 4‒150 Gy linear dose range (150 Gy was the maximal dose applied to gels in this work), 0.0070 Gy-1 cm-1 dose sensitivity (derived from absorbance (600 nm) = f (dose) for 6 MeV electrons, 0.88(3) Gy s-1 and 0.0156 Gy-1 cm-1 derived from optical density (Δµ) = f (dose) for 6 MV x-rays, 0.1010 Gy s-1), low initial colour (initial absorbance = 0.0429) and a diffusion coefficient of crystal violet (CV) in LCV-Pluronic of 0.054 ± 0.023 mm2 h-1. Raman spectroscopy was used to characterize LCV-Pluronic chemical changes after irradiation. Differential scanning calorimetry (DSC) revealed that LCV-Pluronic is stable in temperatures between approximately 11 °C and 56 °C. Irradiation of LCV-Pluronic gel impacts on its first sol-gel transition temperature and the thermal effect of this process-both increased with absorbed dose, which might be related to the degradation of Pluronic. LCV-Pluronic is a promising 3D dosimeter for ionising radiation applications. Further work is needed to improve LCV-Pluronic response in the low dose region, and characterize potential effects of pH, temperature during irradiation, and radiation quality/dose rate on dose response characteristics.
Konstantina Kouvati; Malwina Jaszczak; Panagiotis Papagiannis; Slawomir Kadlubowski; Radoslaw Wach; Piotr Maras; Mariusz Dudek; Marek Kozicki. Leuco crystal violet-Pluronic F-127 3D radiochromic gel dosimeter. Physics in Medicine & Biology 2019, 64, 175017 .
AMA StyleKonstantina Kouvati, Malwina Jaszczak, Panagiotis Papagiannis, Slawomir Kadlubowski, Radoslaw Wach, Piotr Maras, Mariusz Dudek, Marek Kozicki. Leuco crystal violet-Pluronic F-127 3D radiochromic gel dosimeter. Physics in Medicine & Biology. 2019; 64 (17):175017.
Chicago/Turabian StyleKonstantina Kouvati; Malwina Jaszczak; Panagiotis Papagiannis; Slawomir Kadlubowski; Radoslaw Wach; Piotr Maras; Mariusz Dudek; Marek Kozicki. 2019. "Leuco crystal violet-Pluronic F-127 3D radiochromic gel dosimeter." Physics in Medicine & Biology 64, no. 17: 175017.
This work reports on the impact of tetrakis(hydroxymethyl)phosphonium chloride (THPC) on the properties of a VIC gel dosimeter (VIC is an abbreviated acronym of VIPARCT). THPC was used as a substitute oxygen scavenger in VIC (17% N-vinylpyrrolidone, 8% N,N'-methylenebisacrylamide, 12% tert-butyl alcohol, 7.5% gelatine, 0.02% hydroquinone and an oxygen scavenger of 0.007% ascorbic acid and 0.0008% CuSO4×5H2O). THPC reduced the gelation time of VIC from hours to minutes. The best composition (VIC-T) contained 14 mM THPC and a reduced gelatine concentration (5%) with respect to VIC, which allowed for gelation in about 3 min. VIC-T was characterised by the same dose sensitivity (0.176 ± 0.003 Gy-1 s-1) for VIC-T and 0.171 ± 0.002 Gy-1 s-1 for VIC), dose threshold (0.5 Gy) and dynamic dose range (0.5‒50 Gy) as VIC, and a lower linear dose range (20 Gy for VIC-T, 30 Gy for VIC) (0.47 T NMR measurements). VIC-T was stable for at least 10 days after irradiation, and 3D dose distribution was stable for over 4 months after irradiation. The dose response of VIC-T was independent of the radiation dose rate, type and energy of radiation for 6 and 15 MV photons and 12 MeV electrons. This is an improvement with respect to VIC which showed a different dose response for 6 MV photons than for 12 MeV electrons and 15 MV photons. Raman spectroscopy showed similarity in the rate of radiation-induced conversion of monomers in VIC and VIC-T, indicating interaction of THPC with gelatine in VIC-T, and showed ageing of gelatine in both dosimeters. Differential scanning calorimetry showed VIC-T stability at 0–80 °C (VIC: 0‒29.5 °C). The chemical polymerisation and crosslinking of gelatine with THPC is reported, the mechanism of which was analysed in detail. A comparison of N-vinylpyrrolidone-containing dosimeters is presented in this work.
Malwina Jaszczak; Beata Kolesinska; Radosław Wach; Piotr Maras; Mariusz Dudek; Marek Kozicki. Examination of THPC as an oxygen scavenger impacting VIC dosimeter thermal stability and comparison of NVP-containing polymer gel dosimeters. Physics in Medicine & Biology 2018, 64, 035019 .
AMA StyleMalwina Jaszczak, Beata Kolesinska, Radosław Wach, Piotr Maras, Mariusz Dudek, Marek Kozicki. Examination of THPC as an oxygen scavenger impacting VIC dosimeter thermal stability and comparison of NVP-containing polymer gel dosimeters. Physics in Medicine & Biology. 2018; 64 (3):035019.
Chicago/Turabian StyleMalwina Jaszczak; Beata Kolesinska; Radosław Wach; Piotr Maras; Mariusz Dudek; Marek Kozicki. 2018. "Examination of THPC as an oxygen scavenger impacting VIC dosimeter thermal stability and comparison of NVP-containing polymer gel dosimeters." Physics in Medicine & Biology 64, no. 3: 035019.
The aims of the study were to identify the short aromatic peptides which are able to form highly ordered amyloid‐like structures in self‐assembling processes, to test the influence of length of hydrophobic peptides on tendency to aggregation, and to check if aggregated peptides fulfill requirements expected for materials useful for scaffolding. All tested hydrophobic peptides were prepared on solid phase by using DMT/NMM/TosO‐ as a coupling reagent. The aggregation was studied by set of independent tests. All tested peptides have been found stable under in vitro test conditions. All fibrous material formed by self‐assembling of peptides does not show cytotoxic effects on L929 fibroblast cells. Peptides containing tyrosine and tryptophan residues effectively accelerated the proliferation and stimulated the activity of L929 fibroblasts.
Agata Chaberska; Justyna Fraczyk; Joanna Wasko; Piotr Rosiak; Zbigniew Kaminski; Agnieszka Solecka; Ewa Stodolak‐Zych; Weronika Strzempek; Elzbieta Menaszek; Mariusz Dudek; Wiktor Niemiec; Beata Kolesinska. Study on the Materials Formed by Self‐Assembling Hydrophobic, Aromatic Peptides Dedicated to Be Used for Regenerative Medicine. Chemistry & Biodiversity 2018, 16, e1800543 .
AMA StyleAgata Chaberska, Justyna Fraczyk, Joanna Wasko, Piotr Rosiak, Zbigniew Kaminski, Agnieszka Solecka, Ewa Stodolak‐Zych, Weronika Strzempek, Elzbieta Menaszek, Mariusz Dudek, Wiktor Niemiec, Beata Kolesinska. Study on the Materials Formed by Self‐Assembling Hydrophobic, Aromatic Peptides Dedicated to Be Used for Regenerative Medicine. Chemistry & Biodiversity. 2018; 16 (3):e1800543.
Chicago/Turabian StyleAgata Chaberska; Justyna Fraczyk; Joanna Wasko; Piotr Rosiak; Zbigniew Kaminski; Agnieszka Solecka; Ewa Stodolak‐Zych; Weronika Strzempek; Elzbieta Menaszek; Mariusz Dudek; Wiktor Niemiec; Beata Kolesinska. 2018. "Study on the Materials Formed by Self‐Assembling Hydrophobic, Aromatic Peptides Dedicated to Be Used for Regenerative Medicine." Chemistry & Biodiversity 16, no. 3: e1800543.
A laser system with a wavelength of 1064 nm was used to generate sp2 carbon on the surfaces of nanodiamond particles (NDPs). The modified by microplasma NDPs were analysed using FT-IR and Raman spectroscopy. Raman spectra confirmed that graphitization had occurred on the surfaces of the NDPs. The extent of graphitization depended on the average power used in the laser treatment process. FT-IR analysis revealed that the presence of C=C bonds in all spectra of the laser-modified powder. The characteristic peaks for olefinic bonds were much more intense than in the case of untreated powder and grew in intensity as the average laser power increased. The olefinized nanodiamond powder was further functionalized using aromatic amines via in situ generated diazonium salts. It was also found that isokinetic mixtures of structurally diverse aromatic amines containing different functional groups (acid, amine) could be used to functionalize the surfaces of the laser-modified nanoparticles leading to an amphiphilic carbon nanomaterial. This enables one-step orthogonal functionalization and opens the possibility of selectively incorporating molecules with diverse biological activities on the surfaces of NDPs. Modified NDPs with amphiphilic properties resulting from the presence carboxyl and amine groups were used to incorporate simultaneously folic acid (FA-CONH-(CH2)5-COOH) and 5(6)-carboxyfluorescein (FL-CONH-(CH2)2-NH2) derivatives on the surface of material under biocompatible procedures.
Justyna Fraczyk; Adam Rosowski; Beata Kolesinska; Anna Koperkiewcz; Anna Sobczyk-Guzenda; Zbigniew J. Kaminski; Mariusz Dudek. Orthogonal Functionalization of Nanodiamond Particles after Laser Modification and Treatment with Aromatic Amine Derivatives. Nanomaterials 2018, 8, 908 .
AMA StyleJustyna Fraczyk, Adam Rosowski, Beata Kolesinska, Anna Koperkiewcz, Anna Sobczyk-Guzenda, Zbigniew J. Kaminski, Mariusz Dudek. Orthogonal Functionalization of Nanodiamond Particles after Laser Modification and Treatment with Aromatic Amine Derivatives. Nanomaterials. 2018; 8 (11):908.
Chicago/Turabian StyleJustyna Fraczyk; Adam Rosowski; Beata Kolesinska; Anna Koperkiewcz; Anna Sobczyk-Guzenda; Zbigniew J. Kaminski; Mariusz Dudek. 2018. "Orthogonal Functionalization of Nanodiamond Particles after Laser Modification and Treatment with Aromatic Amine Derivatives." Nanomaterials 8, no. 11: 908.
This paper presents tribological and corrosion properties of perfluoro and alkylphosphonic self-assembled monolayers formed on Ti incorporated carbon coatings. The Ti-DLC incorporated coatings were deposited on Ti6Al4V substrates by Radio Frequency Plasma Enhanced Chemical Vapour Deposition (RF PECVD) method using combination of methane (CH4) and titanium (IV) isopropoxide (Ti [OCH(CH3)2]4) atmospheres. The obtained coatings were subsequently modified by perfluoro and alkylphosphonic self-assembled layers having hydrocarbon or perfluorocarbon chains (DP and PFDP). Presented results show that application of these compounds on the top of Ti-DLC coatings significantly improves their tribological properties. After 1000 m of ball-on-disc test the DP- and PFDP- modified coatings presented low coefficient of friction, showing particularly more stable and lower value in case of PFDP while the unmodified coating was worn out already after 160 m of the test under the same conditions. The corrosion tests show varied results for both modifiers. In the case of PFDP an increased reactivity of the coating is observed, whereas for DP the results prove the anti-corrosive effect of this self-assembled layer.
M. Cichomski; Barbara Burnat; M. Prowizor; Anna Jedrzejczak; Damian Batory; Ireneusz Piwoński; W. Kozłowski; Witold Szymanski; Mariusz Dudek. Tribological and corrosive investigations of perfluoro and alkylphosphonic self-assembled monolayers on Ti incorporated carbon coatings. Tribology International 2018, 130, 359 -365.
AMA StyleM. Cichomski, Barbara Burnat, M. Prowizor, Anna Jedrzejczak, Damian Batory, Ireneusz Piwoński, W. Kozłowski, Witold Szymanski, Mariusz Dudek. Tribological and corrosive investigations of perfluoro and alkylphosphonic self-assembled monolayers on Ti incorporated carbon coatings. Tribology International. 2018; 130 ():359-365.
Chicago/Turabian StyleM. Cichomski; Barbara Burnat; M. Prowizor; Anna Jedrzejczak; Damian Batory; Ireneusz Piwoński; W. Kozłowski; Witold Szymanski; Mariusz Dudek. 2018. "Tribological and corrosive investigations of perfluoro and alkylphosphonic self-assembled monolayers on Ti incorporated carbon coatings." Tribology International 130, no. : 359-365.
This work discusses the substitution of a gelatine physical gel matrix with a matrix made of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F-127) in five 3D radiotherapy polymer gel dosimeters: MAGAT, PAGAT, NIPAM, VIPARnd (VIP) and VIPARCT (VIC). The current research outcomes showed that not each polymer gel dosimeter could be manufactured with Pluronic F-127. Two of the polymer gel dosimeters (PAGAT and VIP) containing the Pluronic F‐127 matrix allowed for some proper dose response for radiotherapy dosimetry (a response to a dose range of e.g. 0‒50 Gy). The new best performing Pluronic‐based polymer gel dosimeters were characterised by improved nuclear magnetic resonance properties, when being compared to gels with gelatine matrix at the same monomer content. These are: (i) a ~33% higher dose sensitivity; (ii) a comparable or slightly higher linear and dynamic dose range and (iii) a lower (new VIP composition, VIP3) or equivocal (new PAGAT composition, PAGAT2‐Pluronic) dose threshold. However, there might be optimised gelatine based polymer dosimeters demonstrating even better sensitivity. UV-Vis spectrophotometry measurements revealed that Pluronic matrices ensure six-times lower (VIP3–Pluronic) and eight-times lower (PAGAT2–Pluronic) absorbance (at 400 nm) of non-irradiated gels compared to gelatine matrices, which makes the new polymer gel dosimeters optically improved in comparison to their corresponding gelatine-based compositions. The differences in absorption reduce for higher wavelengths. Differential scanning calorimetry measurements revealed the following temperature stability ranges for the gels: (i) VIP with gelatine matrix: 0‒26°C, (ii) VIP3 with Pluronic matrix: 13.8–55.2°C, (iii) PAGAT2 with gelatine matrix: 0–80°C and (iv) PAGAT2 with Pluronic matrix: 21.4–55.2°C. In conclusion, Pluronic F-127 is an attractive co-polymer to serve as a substitute for the gelatine matrix in some 3D polymer gel dosimeters.
Malwina Jaszczak; Radosław Wach; Piotr Maras; Mariusz Dudek; Marek Kozicki. Substituting gelatine with Pluronic F-127 matrix in 3D polymer gel dosimeters can improve nuclear magnetic resonance, thermal and optical properties. Physics in Medicine & Biology 2018, 63, 175010 .
AMA StyleMalwina Jaszczak, Radosław Wach, Piotr Maras, Mariusz Dudek, Marek Kozicki. Substituting gelatine with Pluronic F-127 matrix in 3D polymer gel dosimeters can improve nuclear magnetic resonance, thermal and optical properties. Physics in Medicine & Biology. 2018; 63 (17):175010.
Chicago/Turabian StyleMalwina Jaszczak; Radosław Wach; Piotr Maras; Mariusz Dudek; Marek Kozicki. 2018. "Substituting gelatine with Pluronic F-127 matrix in 3D polymer gel dosimeters can improve nuclear magnetic resonance, thermal and optical properties." Physics in Medicine & Biology 63, no. 17: 175010.
This work is a follow-up study for a recently-proposed 3D radiochromic gel dosimeter that contains a tetrazolium salt and a physical gel matrix made of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F-127). Several tetrazolium salts were examined in this work, including tetrazolium violet (TV), blue tetrazolium chloride (BT), nitro blue tetrazolium chloride (NBT), tetranitro blue tetrazolium chloride (tNBT) and thiazolyl blue tetrazolium bromide (TBTB). The salt-containing gel dosimeters were compared with the first Pluronic gel composition that contained 2,3,5-triphenyltetrazolium chloride (TTC) as the radiation-sensitive component (dose sensitivity of 0.0023 (Gy cm)–1). The Pluronic gels with NBT and tNBT outperformed the other gels, including the TTC-containing gel, with respect to their dose sensitivity and low dose-response. The NBT gels were found to have better stability over time than tNBT gels. Sensitization of the gels to ionizing radiation was examined by addition of tert-butyl alcohol and sodium formate. The best composition was 0.0818% NBT (1 mM), 25% Pluronic F-127 and 0.136 × 10−2% sodium formate. This gel dosimeter was insensitive to changes in dose rate for photons of different energies. The mean dose sensitivity amounted to 0.0047±0.1×10-4 (Gy cm)-1. A diversion in the dose-response was observed for the gel irradiated with electrons. Additional characteristics of the NBT gel were a linear-dose range and a dynamic-dose range between <1 and ≥150 Gy and a dose threshold of 1 Gy. The dose distribution registered for the NBT-Pluronic gel was stable after irradiation for over 7 days with no visible diffusion of the irradiated part, which is analogous to the original TTC-Pluronic gel.
Klaudia Kwiatos; Piotr Maras; Slawomir Kadlubowski; Zbigniew Stempien; Mariusz Dudek; Marek Kozicki. Tetrazolium salts-Pluronic F-127 gels for 3D radiotherapy dosimetry. Physics in Medicine & Biology 2018, 63, 095012 .
AMA StyleKlaudia Kwiatos, Piotr Maras, Slawomir Kadlubowski, Zbigniew Stempien, Mariusz Dudek, Marek Kozicki. Tetrazolium salts-Pluronic F-127 gels for 3D radiotherapy dosimetry. Physics in Medicine & Biology. 2018; 63 (9):095012.
Chicago/Turabian StyleKlaudia Kwiatos; Piotr Maras; Slawomir Kadlubowski; Zbigniew Stempien; Mariusz Dudek; Marek Kozicki. 2018. "Tetrazolium salts-Pluronic F-127 gels for 3D radiotherapy dosimetry." Physics in Medicine & Biology 63, no. 9: 095012.
Silicon-containing diamond-like carbon (Si-DLC) coatings were prepared on silicon wafers by Radio Frequency Plasma Enhanced Chemical Vapor Deposition (RF-PECVD) method using methane / hexamethyl-disiloxane atmosphere. Herein, we report that Si-DLC coatings can be effectively modified by fluoroalkylsilanes which results in significant enhancement of frictional and wettability properties. Two types of fluoroalkylsilanes differing in the length of fluorocarbon chains were deposited on Si-DLC coatings with the use of Vapor Phase Deposition (VPD) method. The chemical composition of Si-DLC coatings and effectiveness of modification with fluoroalkylsilanes were confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). Frictional properties in microscale were investigated with the use of ball-on-flat apparatus operating at millinewton (mN) load range. It was found that the presence of silicon enhances the chemisorption of fluoroalkylsilanes on Si-DLC coatings by creating adsorption anchoring centers. In consequence, a decrease of adhesion and an increase of hydrophobicity along with a decrease of coefficient of friction were observed. Experimental results indicate, that tribological properties are correlated with dispersive and acid-base components of the surface free energy as well as with the work of adhesion.
Ewelina Bystrzycka; Milena Prowizor; Ireneusz Piwoński; Aneta Kisielewska; Damian Batory; Anna Jedrzejczak; Mariusz Dudek; Witold Kozlowski; Michal Cichomski. The effect of fluoroalkylsilanes on tribological properties and wettability of Si-DLC coatings. Materials Research Express 2018, 5, 036411 .
AMA StyleEwelina Bystrzycka, Milena Prowizor, Ireneusz Piwoński, Aneta Kisielewska, Damian Batory, Anna Jedrzejczak, Mariusz Dudek, Witold Kozlowski, Michal Cichomski. The effect of fluoroalkylsilanes on tribological properties and wettability of Si-DLC coatings. Materials Research Express. 2018; 5 (3):036411.
Chicago/Turabian StyleEwelina Bystrzycka; Milena Prowizor; Ireneusz Piwoński; Aneta Kisielewska; Damian Batory; Anna Jedrzejczak; Mariusz Dudek; Witold Kozlowski; Michal Cichomski. 2018. "The effect of fluoroalkylsilanes on tribological properties and wettability of Si-DLC coatings." Materials Research Express 5, no. 3: 036411.