Article
Biotechnology & Applied Microbiology
Bruna Natalia Alves da Silva Pimentel, Sarah Raquel De Annunzio, Marcelo Assis, Paula Aboud Barbugli, Elson Longo, Carlos Eduardo Vergani
Summary: Silver tungstate (alpha-Ag2WO4), silver molybdate (beta-Ag2MoO4), and silver vanadate (alpha-AgVO3) microcrystals exhibit interesting antimicrobial properties, but their biocompatibility is not fully understood. This study analyzed the cytotoxicity and inflammatory response of silver-containing microcrystals in different cell models and evaluated the production of cytokines and matrix metalloproteinases. The results showed promising biocompatibility profiles for alpha-Ag2WO4, beta-Ag2MoO4, and alpha-AgVO3 microcrystals.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Optics
Mohamed Ezzat, Constantin Aniculaesei, Joong Wook Lee, Seong Ku Lee, Chang Hee Nam
Summary: This study investigates the surface modification of a material irradiated by a nanosecond Nd:YAG green laser while exposed to a gas flow. Scanning electron microscopy images and X-ray diffraction profiles illustrate the effect of laser irradiation in different environments, especially under backing gas pressures of 0.5, 1, and 1.5 bar applied through a supersonic nozzle. After irradiation, the microhardness obtained through the Vickers hardness increased by a factor of 3.40 and 4.90 for Al and Ag, respectively. This enhancement can be attributed to the surface and structural modification of the irradiated sample under different environments. Furthermore, the microhardness was found to be associated with the microstrain.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Anna Sienkiewicz, Piotr Czub
Summary: This study investigated the influence of natural additives on the properties of epoxy resin composites. The composites filled with oak wood waste and peanut shells additive were prepared, and the effects of chemical modification on their chemical structure and morphology were studied. Mechanical tests showed that composites with natural fillers exhibited higher compressive strength, flexural strength, and impact strength compared to the reference epoxy composition. Additionally, composites with oak filler had better mechanical properties than those with peanut shell filler.
Article
Chemistry, Multidisciplinary
David J. Hayne, Bhagya Dharmasiri, Filip Stojcevski, Daniel J. Eyckens, Joel F. Hooper, Luke C. Henderson
Summary: A silver catalysed radical decarboxylation process was used to graft a copolymer onto short carbon fibers. Surface grafting was confirmed by XPS, SEM and TGA, with the polymer accounting for 10% of the modified materials mass. Incorporation of these surface enhanced carbon fibers into an epoxy resin resulted in composites with increased ductility and a change in failure mode from adhesive to cohesive.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Ivanildes S. Bastos, Francisco X. Nobre, Elton R. da Silva, Patricia P. Orlandi, Diene C. Lima, Otoniel da Cunha Mendes, Lizandro Manzato, Maria Luiza Rocco Duarte Pereira, Y. Leyet, Paulo Roggerio C. Couceiro, Walter R. Brito
Summary: In this study, silver tungstate microcrystals synthesized by the hydrothermal method were shown to have antimicrobial properties against gram-positive and gram-negative bacteria. The structural characteristics and optical properties of these microcrystals were also investigated.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Borbala Tegze, Emoke Albert, Boglarka Diko, Norbert Nagy, Adel Racz, Gyorgy Safran, Attila Sulyok, Zoltan Horvolgyi
Summary: In this study, mesoporous TiO2 sol-gel coatings were modified with silver using two methods, and the effects of silver modification on the functional properties were investigated. The samples made with the impregnation method showed better functional properties despite having significantly lower silver content. The pore structure influenced the Ag content achieved by the impregnation method, and subsequently affected their photoactivity.
Article
Engineering, Biomedical
Carmen Streich, Frederic Stein, Jurij Jakobi, Alexandra Ingendoh-Tsakmakidis, Nils Heine, Christoph Rehbock, Andreas Winkel, Sebastian Grade, Mark Kuehnel, Vadim Migunov, Andras Kovacs, Thomas Knura, Meike Stiesch, Bernd Sures, Stephan Barcikowski
Summary: This study utilizes targeting silver-gold alloy nanoparticles to demonstrate that silver nanoparticles found inside bacteria follow a RElease-PEnetration-Reduction (REPER) mechanism of the emitted silver cations, potentially mitigating the therapeutic effect related to silver ions.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Environmental Sciences
Jianping Deng, Bing Li, Weizhao Yin, Huaitian Bu, Bo Yang, Ping Li, Xiangyu Zheng, Jinhua Wu
Summary: In this study, nano-sized silver oxides loaded on activated carbon (nAg(2)O/AC) were found to be efficient for bacterial inactivation in drinking water. The nAg(2)O/AC system demonstrated enhanced inactivation efficiency and stability, mainly through direct sterilization by Ag and generation of reactive oxygen species (ROS) for oxidation sterilization. The pH level and renewability of the nAg(2)O/AC also played important roles in the sterilization process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Mechanical
Fangyan Zheng, Jun Zhang, Ligang Yao, Rulong Tan
Summary: Recent studies have shown that proper cutter modification can enhance the wear resistance of gears, reducing wear and increasing the gear's lifespan.
Article
Biochemistry & Molecular Biology
Michael W. Martynowycz, Tamir Gonent
Summary: By soaking ligands into protein microcrystals on TEM grids simultaneously, a high-resolution structure with high occupancy of four ligands was successfully determined, demonstrating efficient uptake of ligands into protein microcrystals. The number of ligands bound and their occupancy was higher compared to larger crystals treated similarly and investigated by X-ray crystallography.
Article
Materials Science, Multidisciplinary
Pengfei Yang, Yunlin Pan, Qinning Wan, Shujie Chen, Mark G. Moloney, Junying Li, Liling Jing, Jinku Xu, Zhiliang Zhang, Jinlong Mao
Summary: This study successfully introduced methylthio groups into cotton materials using a carbene modification method, and formed composite materials with silver nanoparticles. Experiments on various substrates demonstrated the wide applicability of this method, and the resulting materials exhibited excellent antibacterial activity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Multidisciplinary
Dorota Puchowicz, Alicja Nejman, Irena Kaminska, Malgorzata Cieslak
Summary: This study characterizes cotton and wool fabrics modified by silver nanowires, finding that the presence of dye significantly affects the surface modification with AgNWs, with the amount of nanowires deposited on wool increasing with higher dye contents. Surface-enhanced Raman spectroscopy effect was observed on both fabrics following AgNW modification.
Article
Construction & Building Technology
Fatemeh Cheraghcheshm, Vahid Javanbakht
Summary: In this study, ZnO and silver nanoparticles were coated on the brick surface using chemical deposition to create hydrophobic, photocatalytic, and antibacterial properties of the brick. Characterization of the modified brick nanocomposite was done using various techniques, and tests showed improvement in photocatalytic and antibacterial properties. Flexural strength test demonstrated a significant increase in strength for the modified brick, with reduced efflorescence on the surface.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Materials Science, Paper & Wood
Adrian Krzysztof Antosik, Piotr Miadlicki, Katarzyna Wilpiszewska, Agata Markowska-Szczupak, Zvi C. Koren, Agnieszka Wroblewska
Summary: The study focused on modifying polysaccharide films with terpene compounds and colloidal silver for medical patch applications. Films containing terpenes showed better medicinal properties than those containing colloidal silver, as confirmed by microbiological tests.
Article
Psychology, Multidisciplinary
Meiling Hong, Zhenfeng Ge, Chanti Wu
Summary: Entrepreneurial ecosystems (EEs) are regions with intensive and coordinated entrepreneurship practices, and this research focuses on understanding how an EE emerges. By developing a two-phase model with Bourdieu's approach and analyzing interviews with technology entrepreneurs from Shenzhen, China, the study reveals that pursuit of economic capital and the habitus of quick profit result in copycat business practices in the heteronomous phase, while valuing cultural capital and altruism lead to innovation activity practices in the autonomous phase. The study suggests that public sectors should invest in technology-driven industries and social events can transform entrepreneurship practices.
FRONTIERS IN PSYCHOLOGY
(2023)
Article
Physics, Multidisciplinary
I. S. Yasnikov, A. Yu Vinogradov
Summary: Using the acoustic emission method, the probability density distribution function of shear band lengths in a metallic glass was determined, showing independence from glass composition and experimental conditions. The power-law form of this distribution independently confirms the observed quadratic scaling in the time dependence of shear processes in metallic glass.
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Evgeniy Merson, Pavel Myagkikh, Vitaliy Poluyanov, Maxim Dorogov, Dmitri Merson, Alexei Vinogradov
Summary: The study compared the fracture surfaces and cracks in technically pure iron, Fe-2.5% Si alloy, and low-carbon steel grade S235JR produced by quasi-cleavage (QC) hydrogen-assisted cracking (HAC) and true cleavage (TC). It found that the morphology and topological features of QC and TC fracture surfaces are fundamentally different in all investigated materials, and the crystallographic orientation of QC facets is generally different from TC.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
G. Klevtsov, R. Z. Valiev, N. A. Klevtsova, M. Fesenyuk, M. N. Tyurkov, A. Polyakov
Summary: This study investigated the mechanical behavior and mechanism of torsional fracture of medical grade titanium Grade4 with ultrafine-grained (UFG) structure compared to coarse-grained (CG) structure. The research found that UFG titanium has increased torsional strength and yield strength, while reducing shear deformation compared to CG titanium.
LETTERS ON MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
I. S. Yasnikov, Y. Kaneko, M. Uchida, A. Vinogradov
Summary: By revisiting the strain hardening behavior from the perspective of an analytical model based on the evolution of dislocation density with strain, the study extended the capacity of the single internal variable model to predict necking instability and re-examined the influence of grain size on flow stress. The analysis highlighted the significance of dynamic recovery in necking occurrence and emphasized the validity of using simple modeling of dislocation density evolution for predicting stress-strain behavior and necking instability onset.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Coatings & Films
Anton Polunin, Alisa O. Cheretaeva, Eugeny D. Borgardt, Igor A. Rastegaev, Mikhail M. Krishtal, Alexander Katsman, Igor S. Yasnikov
Summary: The incorporation of TiC NPs significantly improved the hardness, effective elastic modulus, wear resistance, and corrosion resistance of the oxide layer, while also increasing the layer thickness. This enhancement was attributed to the chemically inert incorporation of particles and an increase in layer crystallinity.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Gennadiy V. Klevtsov, Ruslan Z. Valiev, Natal'ya A. Klevtsova, Maxim N. Tyurkov, Mikhail L. Linderov, Marina M. Abramova, Arseniy G. Raab, Timur B. Minasov
Summary: This paper investigates the corrosion-resistant austenitic steel Fe-0.02C-18Cr-8Ni for medical applications and compares the mechanical properties of the steel in initial and ultrafine-grained states. The study demonstrates that the ultrafine-grained steel 0.08C-18Cr-9Ni exhibits significantly improved properties and is highly promising for medical product manufacturing under various types of loads.
Article
Physics, Condensed Matter
N. S. Matveeva, N. N. Gryzunova, I. S. Yasnikov
Summary: This report presents experimental evidence demonstrating the possibility of controlling the habit of microcrystals in electrodeposited nickel coatings. The introduction of additives in the electrolyte influences the competition between different crystallographic facets, leading to the growth of microcrystal facets with specific crystallographic orientation. This results in the preparation of nickel coatings mainly composed of microcrystals exhibiting pentagonal symmetry and containing disclination-type defects.
PHYSICS OF THE SOLID STATE
(2022)
Article
Materials Science, Multidisciplinary
A. Sendrowicz, A. O. Myhre, I. S. Yasnikov, A. Vinogradov
Summary: This study revisits the classical topic of elastic energy storage during strain hardening of metals from the perspective of an analytically tractable thermodynamic modelling framework. The model's versatility has been extended to predict energy partitioning during plastic flow. The obtained analytical solutions demonstrate good predictive capability and can be applied to other metals.
Article
Physics, Multidisciplinary
K. K. Kudasheva, M. L. Linderov, A. I. Brilevsky, A. V. Danyuk, I. S. Yasnikov, D. L. Merson
Summary: The results of mechanical tests on magnesium alloys, namely Mg-Zn-Ca and Mg-Zn-Y, which are promising for medical applications, are presented. The study reveals a temperature and strain-rate sensitive behavior of the stress-strain curves, where an increase in plasticity and a decrease in the stable plastic flow range occur simultaneously with increasing temperature. The experimentally determined activation energy of dislocation annihilation can be used to predict the extent of plastic strain corresponding to the point of stability loss in plastic flow at different temperatures. The prospects of utilizing these findings in the production and operation of medical devices are also discussed.
RUSSIAN PHYSICS JOURNAL
(2023)
Article
Chemistry, Physical
Gennadiy V. V. Klevtsov, Ruslan Z. Z. Valiev, Luiza R. R. Rezyapova, Natal'ya A. Klevtsova, Maksim N. N. Tyurkov, Mikhail L. L. Linderov, Maksim V. V. Fesenyuk, Olesya A. A. Frolova
Summary: This study evaluates the fatigue strength of ultrafine-grained titanium in the low-cycle fatigue region and compares the strength of medical implants made of ultrafine-grained titanium with those made of coarse-grained titanium under various types of loading. The research demonstrates that medical implants made of ultrafine-grained titanium have higher strength under different types of loading, opening up possibilities for miniaturizing medical products.
Article
Materials Science, Multidisciplinary
G. Klevtsov, R. Z. Valiev, M. Fesenyuk, N. A. Klevtsova, M. N. Tyurkov, A. A. Matchin, E. Nosov
Summary: This paper investigates the mechanical properties of titanium Grade4, magnesium alloy Mg-Zn-Ca, and corrosion-resistant austenitic steel 08Kh18N9 for medical applications. The study compares the properties of coarse-grained (CG) and ultrafine-grained (UFG) materials produced by severe plastic deformation processing. It is found that the UFG materials have higher strength and lower sensitivity to cyclic overloads. Therefore, UFG materials show promise for the manufacture of medical devices.
LETTERS ON MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
I. M. Sosnin, L. A. Sokura, M. V. Dorogov, I. G. Smirnova, A. E. Romanov
Summary: Ellipsoid-shaped acid-resistant microparticles of 8-Ga2O3 were synthesized by chemical reaction of gallium nitrate and ammonia in an aqueous solution, followed by annealing in air. The particle size was found to depend non-monotonously on the molar ratio of the reacting substances. The maximum size (length 1718 +/- 291 nm, diameter 746 +/- 198 nm) was obtained at an ammonia to gallium nitrate ratio of 9:1, with a decrease in size observed with both reducing and increasing the ratio. The particles exhibited a layered structure with a thickness of 30 +/- 5 nm.
Article
Chemistry, Physical
Boris Krichevtsov, Alexander Korovin, Sergey Suturin, Aleksandr A. Levin, Ivan Lobov, Andrey Telegin, Andrey Badalyan, Vladimir Sakharov, Igor Serenkov, Maxim Dorogov, Nikolai Sokolov
Summary: Thin films of BaM hexaferrite were grown on alpha-Al2O3(0001) substrates by laser molecular beam epitaxy, and their structural, magnetic, and magneto-optical properties were studied. Annealing of the films was shown to significantly affect their structural and magnetic properties. Magnetic hysteresis loops were observed only in annealed films, with the shape of the loops depending on film thickness. The magneto-optical spectra and ferromagnetic resonance spectra of the thin films were consistent with previous observations in bulk samples and films of BaM hexaferrite.
Article
Materials Science, Characterization & Testing
I. A. Rastegaev, I. S. Yasnikov, I. I. Rastegaeva, E. A. Agletdinov, D. L. Merson
Summary: This paper proposes an approach to calculating the probability of detecting acoustic emission (AE) signals in various signal-to-noise ratios (SNR) and demonstrates good agreement with experimental data. The approach analyzes the distribution areas of amplitude spikes in the signal and noise, exceeding the amplitude discrimination threshold, frame by frame, allowing for estimates with SNR < 6 dB. The proposed approach provides a transition from estimating the probability of missing a signal due to a defect to estimating the probability of detecting different types of signals with varying degrees of transformation (distortion).
RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING
(2022)
Article
Physics, Multidisciplinary
I. S. Yasnikov, N. N. Gryzunova
Summary: The study explains the formation of microcrystals with a fullerene-like truncated icosahedral habit observed in copper electrodeposition experiments, analyzing the significant role of surface energy in their evolution and presenting reasons for the stability of this rare habit in single-component small particles and microcrystals observed experimentally.
