Journal articles: 'Oxide matrices'

1

Azeem, Muhammad, and Muhammad Azhar Saleem. "A Raman Spectroscopic Study of Calcium Silicate Hydrate (CSH) in the Cement Matrix with CNTs and Oxide Additives." Journal of Spectroscopy 2022 (April 26, 2022): 1–6. http://dx.doi.org/10.1155/2022/2281477.

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The calcium silicate hydrate (CSH) concentration in the cement paste mixed with different types of carbon nanotubes (CNTs) and oxide additives is compared by using Raman spectroscopy. The pristine, hydroxyl and carboxyl functionalized CNTs are used in this work. The oxide additives are zinc oxide (ZnO), gadolinium oxide (Gd2O3), and silicon oxide (SiO2). A laser wavelength of 785 nm was used to collect the Raman spectra. It was observed that the concentration of calcium silicate hydrate (CSH) is unaffected in CNTs-OPC matrices regardless of the type and weight percentage of the CNTs. The oxides, as expected, show significant effects on the concentration of the CSH in the matrices. An increase in the CSH concentration is observed in the ZnO and Gd2O3 matrices with cement. For the SiO2 cement paste matrix, however, the CSH concentration appears to be decreased. This study shows CSH concentration can be controlled by using oxide additives whereas CNTs do not react chemically with the cement composites.

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Azeem, Muhammad, and Muhammad Azhar Saleem. "A Raman Spectroscopic Study of Calcium Silicate Hydrate (CSH) in the Cement Matrix with CNTs and Oxide Additives." Journal of Spectroscopy 2022 (April 26, 2022): 1–6. http://dx.doi.org/10.1155/2022/2281477.

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The calcium silicate hydrate (CSH) concentration in the cement paste mixed with different types of carbon nanotubes (CNTs) and oxide additives is compared by using Raman spectroscopy. The pristine, hydroxyl and carboxyl functionalized CNTs are used in this work. The oxide additives are zinc oxide (ZnO), gadolinium oxide (Gd2O3), and silicon oxide (SiO2). A laser wavelength of 785 nm was used to collect the Raman spectra. It was observed that the concentration of calcium silicate hydrate (CSH) is unaffected in CNTs-OPC matrices regardless of the type and weight percentage of the CNTs. The oxides, as expected, show significant effects on the concentration of the CSH in the matrices. An increase in the CSH concentration is observed in the ZnO and Gd2O3 matrices with cement. For the SiO2 cement paste matrix, however, the CSH concentration appears to be decreased. This study shows CSH concentration can be controlled by using oxide additives whereas CNTs do not react chemically with the cement composites.

3

Egorin, Andrei, Eduard Tokar, Anna Matskevich, Nikita Ivanov, Ivan Tkachenko, Tatiana Sokolnitskaya, and Larisa Zemskova. "Composite Magnetic Sorbents Based on Iron Oxides in Different Polymer Matrices: Comparison and Application for Removal of Strontium." Biomimetics 5, no. 2 (May 18, 2020): 22. http://dx.doi.org/10.3390/biomimetics5020022.

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Introduction of magnetic nanoparticles into composite sorbents based on polymer matrices has received great attention due to the possibility of using cheap iron oxides and removing spent sorbents by means of magnetic separation. In the present paper, we discuss the problem of creating magnetic sorbents using two types of matrices as host materials: synthetic cation exchange resin and natural aminopolysaccharide chitosan. The possibilities of applying matrices for the in situ formation of oxide phases of a specified composition with the required content of an inorganic component in a composite material were estimated. The composition of the oxide phase formed in the composite material was studied, and particle sizes were evaluated by the method of X-ray diffraction analysis. Magnetic characteristics were investigated. Sorption characteristics with respect to strontium for the composites containing iron oxides were determined.

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Frolova, Elena, Tobias Otto, Nikolai Gaponik, and Vladimir Lesnyak. "Incorporation of CdTe Nanocrystals into Metal Oxide Matrices Towards Inorganic Nanocomposite Materials." Zeitschrift für Physikalische Chemie 232, no. 9-11 (August 28, 2018): 1335–52. http://dx.doi.org/10.1515/zpch-2018-1139.

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Abstract In this work we present a technique of incorporation of semiconductor CdTe nanocrystals (NCs) into metal oxide matrices prepared by inorganic sol-gel method. As the matrices, we chose alumina and aluminum tin oxide, which are optically transparent in the visible region. Among them the first is electrically insulating, while the second is conductive and thus can be used in optoelectronic devices. We found optimal synthetic parameters allowing us to maintain optical properties of the NCs in both matrices even after heating up to 150°C in air. Therefore, in our approach we overcame a common problem of degradation of the optical properties of semiconductor NCs in oxide matrices as a result of the incorporation and subsequent interaction with the matrix. The resulting materials were characterized in detail from the point of view of their optical and structural properties. Based on the results obtained, we suggest the formation mechanism of these materials. Semiconductor NCs embedded in robust and optically transparent metal oxides offer promising applications in optical switching, optical filtering, waveguides, light emitting diodes, and solar concentrators.

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Silva, Nuno João O., Angel Millan, Vitor S. Amaral, Fernando Palacio, Lianshe Fu, Luís D. Carlos, and V. de Zea Bermudez. "Iron Oxide and Oxide-Hydroxide Nanoparticles in Organic-Inorganic Matrices." Materials Science Forum 514-516 (May 2006): 142–46. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.142.

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Nanometric ferrihydrite, maghemite and magnetite particles formed within an organicinorganic hybrid matrix were obtained by the sol-gel process. In contrast to precipitation techniques, sol-gel process appears as suitable way to achieve size-controlled nanoscopic magnetic particles anchored in a hybrid structure. The hybrid matrix here reported, named di-ureasil, is composed of poly(oxyethylene) chains grafted to siloxane groups by means of urea cross-linkages. The formation of ferrihydrite particles was achieved incorporating iron nitrate during the sol-gel process, at low pH. The formation of maghemite takes place after the incorporation of a mixture of Fe3+ and Fe2+ ions and treatment with an ammonia solution, after the sol-gel process. Magnetite nanoparticles are formed after the incorporation of Fe2+ ions and treatment with ammonia at 80°C. The AC magnetic susceptibility shows thermal irreversibility with a blocking temperature TB≈13K and ≈25K depending on frequency for the ferrihydrite and maghemite particles, respectively. The magnetite nanoparticles are blocked at room temperature. Above the irreversibility the magnetization of ferrihydrite and maghemite follows a Langevin function modified with a linear term, as found in antiferromagnetic and ferrimagnetic particles.

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Hubicki, Rafał, Maria Richert, and Piotr Łebkowski. "Influence of Operating Temperature on the Service Life of Aluminum Extrusion Dies." Materials 15, no. 19 (September 26, 2022): 6656. http://dx.doi.org/10.3390/ma15196656.

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The article investigates the effect of temperature and annealing time on the surface quality of WNLV nitrided steel used for the production of dies for extrusion of aluminum alloys. Eight annealing variants were tested, differing in the total annealing time at temperatures of 460 °C and 590 °C. The results show the effect of the annealing time on the width of the diffusion layer, which increased with the increasing length of the annealing time. The hardness decreased as the annealing time increased. It was found that annealing of the steel causes its oxidation. The oxide layer formed consisted of two layers, more specifically, an Fe2O3 oxide layer and a lower Fe3O4 oxide layer adhering to the steel surface. The surface of sections pressed on oxidized matrices was tested. The roughness of the surface of the oxide layers was also tested. The research revealed that an increase in the surface roughness of the oxides deposited on the matrices causes an increase in the roughness of the extruded sections. These results can potentially be used to improve the efficiency of the extrusion process and the quality of the extruded sections.

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Terencio, Tercio Bezerra Correia, Valter Bavastrello, and Claudio Nicolini. "Calcium Oxide Matrices and Carbon Dioxide Sensors." Sensors 12, no. 5 (May 8, 2012): 5896–905. http://dx.doi.org/10.3390/s120505896.

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Estrada, C., J. A. Gonzalez, A. Kunold, J. A. Reyes-Esqueda, and P. Pereyra. "Photoluminescence of nanocrystals embedded in oxide matrices." physica status solidi (c) 4, no. 2 (February 2007): 248–52. http://dx.doi.org/10.1002/pssc.200673264.

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Larichev, Timothy, Natalia Fedorova, Yuri Zakharov, Valerii Pugachev, Tatiana Sergina, and Liudmila Khitsova. "Catalytic thermo-oxidation of carbon matrix in the nanocomposite electrode material for supercapacitors preparation process." E3S Web of Conferences 460 (2023): 10041. http://dx.doi.org/10.1051/e3sconf/202346010041.

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The study of thermal oxidation in air of carbon matrix in the presence of nanosized particles of filler - cobalt oxide Co3O4, as well as mixed oxides NiCo2O4 and ZnxCo1-xOy was carried out. The particles of transition metal oxides were created by thermal decomposition of precursor compounds (azides and hydroxides). It is shown that vigorous oxidation in the air of the porous carbon matrix starts after the formation of Co3O4 at temperatures above 300 ° C. The intensity of oxidation is directly proportional to the filler concentration in the carbon-transition metal oxide composite system. Carbon matrices based on multilayer carbon tubes show higher resistance to oxidation processes.

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Ros Madi, Nur Alia Farhana, Nurfatehah Wahyuny Che Jusoh, Yuki Nagao, Lian See Tan, and Mariam Firdhaus Mad Nordin. "Utilizing metal oxide/fabric composites for photocatalytic degradation of wastewater." E3S Web of Conferences 516 (2024): 03004. http://dx.doi.org/10.1051/e3sconf/202451603004.

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The growing concern over water pollution has increased the search for innovative and sustainable approaches to wastewater treatment. This manuscript offers a concise exploration of the utilization of composite materials comprising metal oxides and fabrics for the purpose of photocatalytic degradation. Metal oxides, including titanium dioxide (TiO2), zinc oxide (ZnO), and etc possess inherent photocatalytic properties that, when combined with fabric matrices, present a synergistic approach for pollutant removal. The incorporation of metal oxides and fabrics enhances the photocatalytic performance through the improvement of the catalyst properties. This review covers the photocatalytic mechanisms and properties of metal oxide fabric composites as well as the applications of these composites in environmental remediation and wastewater treatment. As a promising avenue for sustainable pollutant mitigation, further research in this field holds the key to unlocking the full potential of metal oxide fabric composites in diverse environmental applications.

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Grandis, Rone Aparecido De, Larissa Natiele Miotto, Luis Eduardo Genaro, Larissa Migliatti Polli, Ana Maria de Guzzi Plepis, Fabiana Tessari Rodrigues, Virginia da Conceição Amaro Martins, Leonardo Pereira Franchi, Raquel Mantuaneli Scarel-Caminaga, and Ticiana Sidorenko de Oliveira Capote. "In Vitro Evaluation of Acellular Collagen Matrices Derived from Porcine Pericardium: Influence of the Sterilization Method on Its Biological Properties." Materials 14, no. 21 (October 21, 2021): 6255. http://dx.doi.org/10.3390/ma14216255.

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The aim of this study were characterize acellular collagen matrices derived from porcine pericardium (PP) and to evaluate their properties after sterilization by ethylene oxide and gamma ray. PP matrices were subjected to alkaline hydrolysis (AH), and samples were characterized for biological stability, membrane thickness measurements, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). Subsequently, the matrices were frozen, lyophilized and sterilized by ethylene oxide or gamma radiation. For in vitro assays, CHO-K1 cell culture was used and evaluated for cytotoxicity, clonogenic survival assay, genotoxicity and mutagenicity. Analysis of variance (ANOVA) was used, followed by Dunnett’s post-test, with a significance level of 5%. After AH, there was no significant change in matrix thickness. The relative biodegradability of the material after implantation was observed. Morphology and dimensions had small changes after AH. As for cell viability, none of the tested matrices showed a statistically significant difference (p > 0.05; Dunnett) regardless of the sterilization method. Furthermore, it was found that PP matrices did not interfere with the proliferation capacity of CHO-K1 cells (p > 0.05; Dunnett). As for genotoxicity, when sterilized with ethylene oxide (NP, P12 and P24), it showed genotoxic potential, but it was not genotoxic when sterilized by gamma radiation. No mutagenic effects were observed in either group. PP-derived collagen matrices hydrolyzed at different times were not cytotoxic. It is concluded that the best method of sterilization is through gamma radiation, since no significant changes were observed in the properties of the PP matrices.

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Homaunmir, V., S. H. Tohidi, G. Grigorya, and M. Ayatollah Zada Shirazi. "Dependence Properties of Sol-Gel Derived CuO@SiO2 Nanostructure to Diverse Concentrations of Copper Oxide." Journal of Nanoparticles 2013 (September 19, 2013): 1–5. http://dx.doi.org/10.1155/2013/156813.

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Various concentrations of copper oxide were embedded into silica matrix of xerogel forms using copper source Cu(NO3)2·3H2O. The xerogel samples were prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) with determination of new molar ratios of the components by the sol-gel method. In this paper, three samples of copper oxide were doped into silica matrices using different concentrations. We obtained 10, 20, and 30 wt.% of copper oxide in silica matrices labeled as A, B, and C, respectively. The absorption and transmittance spectra of the gel matrices were treated at different concentrations by Uv-vis spectrophotometer. Quantities of water and transparency in the silica network change the spectral characteristics of Cu2+ ions in the host silica. Absorption spectra of the samples heated to higher concentration complete the conversion of Cu2+ ions to Cu+ ions. The effects of concentration of copper oxide were characterized by X-ray diffraction (XRD) patterns, and the transmission electron microscope (TEM) micrographs. Also, textural properties of samples were studied by surface area analysis (BET method) at different concentrations.

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Yashkina, S. Yu, V. A. Doroganov, Yu N. Trepalina, V. A. Loktionov, and E. I. Evtushenko. "Matrices of radiation-protective composites using bismuth oxide." IOP Conference Series: Materials Science and Engineering 327 (March 2018): 032061. http://dx.doi.org/10.1088/1757-899x/327/3/032061.

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Marinero, E. E. "Laser-driven metal cluster segregation in oxide matrices." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 3, no. 5 (September 1985): 1560. http://dx.doi.org/10.1116/1.582984.

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Agarwal, Charu, Sudiksha Aggrawal, Dharm Dutt, and Paritosh Mohanty. "Cerium oxide immobilized paper matrices for bactericidal application." Materials Science and Engineering: B 232-235 (August 2018): 1–7. http://dx.doi.org/10.1016/j.mseb.2018.10.008.

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Wilson, Michael S., and R. David Rauh. "Novel amperometric immunosensors based on iridium oxide matrices." Biosensors and Bioelectronics 19, no. 7 (February 2004): 693–99. http://dx.doi.org/10.1016/s0956-5663(03)00275-6.

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Ghosh, Abhijit, Ji Young Park, Christopher Fenno, and Yvonne L. Kapila. "Porphyromonas gingivalis, Gamma Interferon, and a Proapoptotic Fibronectin Matrix Form a Synergistic Trio That Induces c-Jun N-Terminal Kinase 1-Mediated Nitric Oxide Generation and Cell Death." Infection and Immunity 76, no. 12 (October 6, 2008): 5514–23. http://dx.doi.org/10.1128/iai.00625-08.

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ABSTRACT During infection and inflammation, bacterial and inflammatory proteases break down extracellular matrices into macromolecular fragments. Fibronectin fragments are associated with disease severity in arthritis and periodontitis. The mechanisms by which these fragments contribute to disease pathogenesis are unclear. One likely mechanism is that fibronectin fragments induce apoptosis of resident cells, which can be further modulated by nitric oxide. Nitric oxide levels are increased at inflammatory sites in periodontitis patients. The aim of this study was to examine whether a proapoptotic fibronectin matrix (AFn) exerts its action by inducing nitric oxide and whether priming by bacterial and inflammatory components exacerbates this mechanism. Our data demonstrate that AFn increased the levels of nitric oxide and inducible nitric oxide synthase (iNOS) dose and time dependently in periodontal ligament (PDL) cells. These effects and apoptosis were inhibited by iNOS suppression and enhanced by iNOS overexpression. Nitric oxide and iNOS induction were paralleled by increased c-Jun N-terminal kinase 1 (JNK-1) phosphorylation. JNK-1 overexpression enhanced the expression of nitric oxide and iNOS, whereas inhibiting JNK-1 by small interfering RNA or a kinase mutant reversed these findings. Priming PDL cells with Porphyromonas gingivalis, its lipopolysaccharide (LPS), or gamma interferon (IFN-γ) further increased nitric oxide levels and apoptosis. Escherichia coli and Streptococcus mutans induced lesser effects. Gingival fibroblasts and neutrophils responded to a lesser degree to these stimuli, whereas keratinocytes were resistant to apoptosis. Thus, proapoptotic matrices trigger nitric oxide release via JNK-1, promoting further apoptosis in host cells. LPS and IFN-γ accentuate this mechanism, suggesting that during inflammation, the affected matrices and bacterial and inflammatory components combined exert a greater pathogenic effect on host cells.

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Kenzhina, I. E., A. A. Shaimerdenov, A. U. Tolenova, S. K. Askerbekov, and A. L. Kozlovskiy. "STUDY OF PHASE FORMATION PROCESSES IN CER-CER TYPE INERT MATRICES BASED ON OXIDE COMPOUNDS." NNC RK Bulletin, no. 3 (September 28, 2022): 82–87. http://dx.doi.org/10.52676/1729-7885-2022-3-82-87.

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The purpose of this work is to study the processes of phase formation in the samples (1-x)ZrO2 – xAl2O3 ceramics depending on the variation of the oxide components, as well as to establish changes in the structural parameters and degree of crystallinity. The choice of zirconium and aluminum oxides as the basis for cer-cer inert matrices for nuclear fuel is due to their physical, chemical, structural and mechanical properties, the combination of which will produce a new type of ceramics with great potential in the field of nuclear fuel. These oxide compounds have high thermal stability and resistance to high temperatures, which also allows their use as a basis for disperse nuclear fuel for new-generation hightemperature nuclear reactors. The method of mechanochemical milling followed by thermal annealing was chosen to obtain ceramics based on oxide compounds. The choice of grinding conditions, as well as the subsequent thermal annealing was chosen to initiate the processes of phase transformations and structural changes as a result of thermal influence and partial relaxation of the deformation distortions and metastable formations initiated during grinding. The X-ray diffraction method was chosen as the main method to study the processes of phase transformation and structural changes. During the studies it was found that the addition of aluminum oxide leads to the structural ordering of the main monocline phase ZrO2, as well as the formation of solid solutions of substitution and introduction. At equal concentrations of the oxide components using the method of X-ray phase analysis was established polymorphic phase transformation in zirconium dioxide, the presence of which indicates the processes of phase transformation arising from the addition of zirconium oxide and changes in the phase formation processes.

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Razaq, Aamir, Faiza Bibi, Xiaoxiao Zheng, Raffaello Papadakis, Syed Hassan Mujtaba Jafri, and Hu Li. "Review on Graphene-, Graphene Oxide-, Reduced Graphene Oxide-Based Flexible Composites: From Fabrication to Applications." Materials 15, no. 3 (January 28, 2022): 1012. http://dx.doi.org/10.3390/ma15031012.

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In the new era of modern flexible and bendable technology, graphene-based materials have attracted great attention. The excellent electrical, mechanical, and optical properties of graphene as well as the ease of functionalization of its derivates have enabled graphene to become an attractive candidate for the construction of flexible devices. This paper provides a comprehensive review about the most recent progress in the synthesis and applications of graphene-based composites. Composite materials based on graphene, graphene oxide (GO), and reduced graphene oxide (rGO), as well as conducting polymers, metal matrices, carbon–carbon matrices, and natural fibers have potential application in energy-harvesting systems, clean-energy storage devices, and wearable and portable electronics owing to their superior mechanical strength, conductivity, and extraordinary thermal stability. Additionally, the difficulties and challenges in the current development of graphene are summarized and indicated. This review provides a comprehensive and useful database for further innovation of graphene-based composite materials.

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Youn, Su-Min, and Soo-Jin Choi. "Food Additive Zinc Oxide Nanoparticles: Dissolution, Interaction, Fate, Cytotoxicity, and Oral Toxicity." International Journal of Molecular Sciences 23, no. 11 (May 28, 2022): 6074. http://dx.doi.org/10.3390/ijms23116074.

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Food additive zinc oxide (ZnO) nanoparticles (NPs) are widely used as a Zn supplement in the food and agriculture industries. However, ZnO NPs are directly added to complex food-matrices and orally taken through the gastrointestinal (GI) tract where diverse matrices are present. Hence, the dissolution properties, interactions with bio- or food-matrices, and the ionic/particle fates of ZnO NPs in foods and under physiological conditions can be critical factors to understand and predict the biological responses and oral toxicity of ZnO NPs. In this review, the solubility of ZnO NPs associated with their fate in foods and the GI fluids, the qualitative and quantitative determination on the interactions between ZnO NPs and bio- or food-matrices, the approaches for the fate determination of ZnO NPs, and the interaction effects on the cytotoxicity and oral toxicity of ZnO NPs are discussed. This information will be useful for a wide range of ZnO applications in the food industry at safe levels.

21

Bakhiia, Tamuna, Anna Yu Romanchuk, Konstantin I. Maslakov, Alexey A. Averin, and Stepan N. Kalmykov. "Use of Reduced Graphene Oxide to Modify Melamine and Polyurethane for the Removal of Organic and Oil Wastes." Energies 15, no. 19 (October 7, 2022): 7371. http://dx.doi.org/10.3390/en15197371.

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Methods for obtaining efficient sorption materials based on highly porous melamine and polyurethane matrices modified with reduced graphene oxide were developed. These materials are promising for solving environmental problems such as water pollution with organic products by sorption treatment. Reduced graphene oxides (rGOs) were synthesized from graphene oxide suspensions using potassium hydroxide, ascorbic acid or hydrazine hydrate. Composites with obtained rGO and melamine and polyurethane foam were produced for further characterization. The composites demonstrate high sorption of organic pollutants (oil, diesel fuel and gasoline) and low sorption of water. The composites were comprehensively analyzed by physicochemical techniques (SEM, XPS, Raman spectroscopy, UV–Vis) to elucidate the mechanism of sorption.

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Chen, Zimei, Dirk Kuckling, and Michael Tiemann. "Porous Aluminum Oxide and Magnesium Oxide Films Using Organic Hydrogels as Structure Matrices." Nanomaterials 8, no. 4 (March 22, 2018): 186. http://dx.doi.org/10.3390/nano8040186.

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Chauhan, Indu, Sudiksha Aggrawal, Chandravati Chandravati, and Paritosh Mohanty. "Metal oxide nanostructures incorporated/immobilized paper matrices and their applications: a review." RSC Advances 5, no. 101 (2015): 83036–55. http://dx.doi.org/10.1039/c5ra13601f.

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Wei, Yu-Ling, Hui-Chin Huang, Hsi-Chih Wang, Yao-Wen Yang, and Jyh-Fu Lee. "Temperature Dependence of Nickel Stabilization in Inorganic Oxide Matrices." Journal of the Air & Waste Management Association 55, no. 10 (October 2005): 1451–55. http://dx.doi.org/10.1080/10473289.2005.10464753.

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Mowery, K. A., and M. E. Meyerhoff. "The transport of nitric oxide through various polymeric matrices." Polymer 40, no. 22 (October 1999): 6203–7. http://dx.doi.org/10.1016/s0032-3861(99)00187-1.

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Mccluskey, A., and IR Dunkin. "Suppression of the Wolff Rearrangement of an Unstrained α-Carbonyl Carbene by CO and O2 in Low-Temperature Matrices." Australian Journal of Chemistry 48, no. 6 (1995): 1107. http://dx.doi.org/10.1071/ch9951107.

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Photolysis of matrix-isolated dimethyl diazomalonate (1) in low-temperature argon matrices resulted in a rapid photoinduced Wolff rearrangement to methoxy(methoxycarbonyl)ketene (3). When the photolysis was carried out in pure CO matrices or argon matrices containing carbon monoxide or dioxygen, the reaction pathway was diverted by trapping of the intermediate carbene (2). With dioxygen, a carbonyl oxide intermediate was detected by u.v.-visible spectroscopy. The relative reactivity of carbene (2) with CO and O2 suggests that it was generated and trapped in a singlet state.

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Bellussi, Francesco Maria, Carlos Sáenz Ezquerro, Manuel Laspalas, and Agustín Chiminelli. "Effects of Graphene Oxidation on Interaction Energy and Interfacial Thermal Conductivity of Polymer Nanocomposite: A Molecular Dynamics Approach." Nanomaterials 11, no. 7 (June 29, 2021): 1709. http://dx.doi.org/10.3390/nano11071709.

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Interfacial characteristics of polymer nanocomposites represent a crucial aspect to understand their global properties and to evaluate the interaction between nanofillers and matrix. In this work we used a molecular dynamics (MD) approach to characterize the interfacial region at the atomistic scale of graphene-based polymer nanocomposites. Three different polymer matrixes were considered, polylactic acid (PLA), polypropylene (PP) and epoxy resin (EPO), which were reinforced with three types of graphene fillers: pristine graphene (G), graphene oxide (GO) and reduced graphene oxide (rGO). In particular, the compatibility of the nanofillers in polymer matrixes were evaluated in terms of the interaction energy, while the interfacial thermal resistance (Kapitza resistance) between matrices and fillers was calculated with a nonequilibrium molecular dynamics (NEMD) method. Results showed that the oxidation degree plays an important role on the studied properties of the interfacial region. In particular, it was observed that the Kapitza resistance is decreased in the oxidized graphene (GO and rGO), while interaction energy depended on the polarity of the polymer matrix molecules and the contribution of the Coulombic component.

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Deline, Alyssa R., and Jeffrey A. Nason. "Evaluation of labeling methods used for investigating the environmental behavior and toxicity of metal oxide nanoparticles." Environmental Science: Nano 6, no. 4 (2019): 1043–66. http://dx.doi.org/10.1039/c8en01187g.

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Rashvand, Masoumeh, and Maryam Vosough. "Graphene oxide–polyaniline nanocomposite as a potential sorbent for dispersive solid-phase extraction and determination of selected pharmaceutical and personal care products in wastewater samples using HPLC with a diode-array detector." Analytical Methods 8, no. 8 (2016): 1898–907. http://dx.doi.org/10.1039/c5ay03182f.

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Sarkar, Arnab, Raju V. Shah, D. Alamelu, and Suresh K. Aggarwal. "Studies on the ns-IR-Laser-Induced Plasma Parameters in the Vanadium Oxide." Journal of Atomic, Molecular, and Optical Physics 2011 (October 16, 2011): 1–7. http://dx.doi.org/10.1155/2011/504764.

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We report spectroscopic studies of laser-induced plasma (LIP) produced by ns-IR-Nd:YAG laser light pulses of different energies onto four different oxides of vanadium (VO, V2O3, VO2, and V2O5) in air under atmospheric pressure. For each oxide with a different oxidation state of vanadium, both electron density and plasma temperature were calculated for different time delays and laser pulse energies. The plasma temperature was determined from Boltzmann plot method, whereas the electron number density was estimated from the Saha equation. The decay rates for plasma temperature as well as electron density were observed to follow power law and were independent of the nature of vanadium oxide. These investigations provide an insight to optimize various parameters during LIBS analysis of vanadium-based matrices.

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Chowdhury, Nargis A., John Robertson, Ahmed Al-Jumaily, and Maximiano V. Ramos. "Fast Release of Sulfosalicylic Acid from Polymer Implants Consisting of Regenerated Cellulose/γ-Ferric Oxide/Polypyrrole." Journal of Applied Chemistry 2014 (December 22, 2014): 1–7. http://dx.doi.org/10.1155/2014/474268.

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This work presents a comparative study on the rate of drug release from implantable matrices induced by electric and magnetic fields separately for better biomedical applications. The matrices were prepared by coating γ-ferric oxide dispersed regenerated cellulose film by polypyrrole doped with sulfosalicylic acid as an anti-inflammatory drug. The drug release mechanisms were studied under both the electric and the magnetic fields separately in an acetate buffer solution with pH 5.5 and temperature 37°C during a period of 5 hours. The amount of drug released was analysed by UV-Vis spectrophotometry. The mechanism of drug release from the matrices under electric field includes expansion of conductive polymer chain and the electrostatic force between electron and drug. The drug release mechanism from the matrices under magnetic field is based on the fact that the heat produced locally by magnetic particles loosens the polymer (polypyrrole) chain surrounding the particles. As a result, the drugs attached to the polypyrrole chain come out to the release medium. The matrices showed fast release of drug, that is, more than 60% of the loaded drug was released within 1 h, and are ideal for the treatment of illness in an emergency care.

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Atanasova, Petia, Maofeng Dou, Shravan R. Kousik, Joachim Bill, and Maria Fyta. "Adsorption of azide-functionalized thiol linkers on zinc oxide surfaces." RSC Advances 11, no. 10 (2021): 5466–78. http://dx.doi.org/10.1039/d0ra05127f.

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Studying the interaction between organic molecules and metal oxide surfaces is key to the development and modification of organic–inorganic hybrids for application in heterogeneous catalysis, biomedical implants, and functional nanoporous matrices.

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Dunkin, Ian R., and Gordon A. Bell. "The generation and photochemistry of indenone -oxide and fluorenone -oxide in low temperature matrices." Tetrahedron 41, no. 2 (January 1985): 339–47. http://dx.doi.org/10.1016/s0040-4020(01)96425-7.

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Mileiko, Sergei, Andrew Kolchin, Olga Shakhlevich, Sergei Galyshev, and Maxim Nikonovich. "Ytterbium Silicate Fibers: Fabrication, Microstructure and Strength." Fibers 7, no. 12 (November 29, 2019): 104. http://dx.doi.org/10.3390/fib7120104.

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High temperature ceramic and metal matrix composites, which are to be used under complicated loading conditions in a severe atmosphere, have to satisfy a large number of the requirements. Hence, development of such composites calls for a large variety of fibers, matrices and interface materials to make an appropriate choice in designing a particular composite. The fiber is definitely the most important component of a composite. The family of oxide fibers is the most important among possible reinforcements for metal and oxide matrices. In this work, a family of potential oxide reinforcements containing ytterbium monosilicate Yb2SiO5 and disilicate Yb2Si2O7, and ytterbia-ytterbium monosilicate eutectic, was obtained and studied. The interest in those silicates was aroused because (i) they are highly resistant to hot corrosion in the presence of water vapor and (ii) their CTE varies from 8 × 10−6 K−1 for monosilicate to 4 × 10−6 K−1 for disilicate.

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Zeng, H. C., J. Lin, and K. L. Tan. "Memory effect of ZrO2 matrix on surface Co3O4–CoO transition." Journal of Materials Research 10, no. 12 (December 1995): 3096–105. http://dx.doi.org/10.1557/jmr.1995.3096.

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Cobalt oxide system Co3O4-CoO has been studied on the ZrO2 matrix surfaces with FTIR and XPS. The tetragonal and monoclinic ZrO2 matrix materials have been synthesized from the Zr-n-propoxide-acetylacetone-water-isopropanol system. The study shows that the ZrO2 matrix is able to retain the relative Co3O4:CoO population at elevated temperatures. The thermodynamically stable oxide population (Co3O4:CoO) at room temperature for ZrO2-supported Co3O4-CoO is about 50:50 (Co2+ :Co3+ = 2:1), which is markedly different from the 100:0 case (Co2+ :Co3+ = 1:2) for an unsupported Co3O4-CoO surface oxide system. The relative Co3O4 :CoO ratio in the surface region of the ZrO2 is temperature dependent but matrix-polymorph independent. The composition of an oxide solid solution formed by the Co3O4-CoO and matrices of ZrO2 is determined to have a cobalt molar percentage of 4.5%. Diffusion thermodynamic quantities are investigated, and the measured diffusion activation energy for a cobalt ion in the ZrO2 matrices is 0.21 eV. The mechanism of the ZrO2 memory effect on surface Co3O4-CoO transition will also be addressed.

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LAHA, RANJIT, and S. KASIVISWANATHAN. "GOLD NANOPARTICLES-EMBEDDED TRANSPARENT CONDUCTING OXIDES: PREPARATION, CHARACTERIZATION, AND TUNING OF THE OPTICAL PROPERTIES." International Journal of Nanoscience 10, no. 01n02 (February 2011): 155–59. http://dx.doi.org/10.1142/s0219581x11007569.

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Gold nanoparticles ( AuNP )-embedded indium oxide and indium tin oxide thin films were prepared by DC and DC magnetron reactive co-sputtering techniques. The concentration and size distribution of AuNP were changed by deposition conditions. The nanoparticles-embedded films were characterized by X-ray diffraction, transmission electron microscopy, and optical spectrophotometry. The X-ray diffraction data showed the polycrystalline nature of indium oxide and indium tin oxide along with the Au (111) peak confirming the presence of elemental AuNP in the matrices. The transmission electron microscope studies revealed that AuNP are distributed in the matrices in different shapes and sizes with the average sizes as 40 nm and 10 nm, respectively for DC-sputtered and DC magnetron-sputtered films. The optical absorbance measurements showed the SPR peak due to AuNP to be around 600 nm. The position and intensity of the SPR peak could be tuned from 650 to 570 nm by changing the concentration of AuNP and annealing the films in oxygen and Ar for different durations.

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Schabikowski, Mateusz, Paweł Kowalczyk, Agnieszka Karczmarska, Barbara Gawdzik, Aleksandra Wypych, Karol Kramkowski, Karol Wrzosek, and Łukasz Laskowski. "Aluminium(III) Oxide—The Silent Killer of Bacteria." Molecules 28, no. 1 (January 3, 2023): 401. http://dx.doi.org/10.3390/molecules28010401.

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In this article, we describe the antimicrobial properties of pristine anodised aluminium oxide matrices—the material many consider biologically inert. During a typical anodisation process, chromium and chlorine compounds are used for electropolishing and the removal of the first-step aluminium oxide. Matrices without the use of those harmful compounds were also fabricated and tested for comparison. The antibacterial tests were conducted on four strains of Escherichia coli: K12, R2, R3 and R4. The properties of the matrices were also compared to the three types of antibiotics: ciprofloxacin, bleomycin and cloxacillin using the Minimal Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) tests. Moreover, DNA was isolated from the analysed bacteria which was additionally digested with formamidopyrimidine-DNA glycosylase (Fpg) protein from the group of repair glycosases. These enzymes are markers of modified oxidised bases in nucleic acids produced during oxidative stress in cells. Preliminary cellular studies, MIC and MBC tests and digestion with Fpg protein after modification of bacterial DNA suggest that these compounds may have greater potential as antibacterial agents than the aforementioned antibiotics. The described composites are highly specific for the analysed model Escherichia coli strains and may be used in the future as new substitutes for commonly used antibiotics in clinical and nosocomial infections in the progressing pandemic era. The results show much stronger antibacterial properties of the functionalised membranes on the action of bacterial membranes in comparison to the antibiotics in the Fpg digestion experiment. This is most likely due to the strong induction of oxidative stress in the cell through the breakdown of the analysed bacterial DNA.

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Miller, P. R., R. H. J. Hannink, and B. C. Muddle. "Quantitative Microanalysis of ZrO2/Non-Oxide Ceramic Composites." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (August 12, 1990): 438–39. http://dx.doi.org/10.1017/s0424820100135794.

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Addition of zirconia (ZrO2) to oxide and non-ox1de ceramics improves consolidation behaviour, strength and toughness of fabricated bodies. Such materials are generally referred to as zirconia-toughened ceramics, ZTC. Typical examples of such systems include oxide matrices such as α- and β"-Al2O3, MgO.Al2O3 (spinel), ZrSiO4 (zircon) and ZnO; non-oxide systems include Sic, Si3N4, TiN, TiCN and TiB2. In these materials an Improved toughness is anticipated as a result of the stress-activated tetragonal to monoclinic transformation in the dispersed ZrO2. In an effort to understand the consolidation mechanisms and microstructural features leading to the improved strength and toughness of ZrO2-TiX (X=C,N,B2) based composites, a systematic study has been made of the composition of the component phases using energy dispersive x-ray spectroscopy (EDXS) and electron energy loss spectroscopy (EELS).The experiments were conducted on two types of samples. Firstly, to establish the kTizr factors for EDXS analysis and to assess the detectability limits of the EELS technique, a series of TiO2-ZrO2 solid-solution standards containing 2.5-13 mole% TiO2 were prepared.

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Yahya, Prima Kharisma Indra, Mohammed Moniruzzaman, and Philip P. Gill. "Interaction and thermal studies on graphene oxide in NC/DEGDN/GO nanocomposites." RSC Advances 9, no. 60 (2019): 35158–64. http://dx.doi.org/10.1039/c9ra07717k.

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Before considering the use of graphene oxide (GO) in nitrate ester-based materials for improved safety and performance its interaction, compatibility, and dispersion with the host matrices needs to be well understood.

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Salvador, Renan Pícolo, Roberto Munhoz Bueno, Dimas Alan Strauss Rambo, and Sandro Martini. "APPLICATION OF GRAPHENE OXIDE IN CEMENTITIOUS COMPOSITES FOR CEMENT CONTENT REDUCTION." Journal of Urban Technology and Sustainability 1, no. 1 (December 26, 2018): 4–9. http://dx.doi.org/10.47842/juts.v1i1.6.

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Cement production is responsible for 5% of CO2 emissions worldwide. The concern about the pollution derived from the construction industry has brought attention to the need of developing more sustainable construction materials and processes. Admixtures based on nanometric graphene oxide have the potential to enhance mechanical properties and durability of cementitious composites. In this context, an experimental program was conducted to evaluate how the addition of graphene oxide may be used to reduce cement content in concretes, maintaining the same mechanical properties of conventional concretes (control matrices, with no graphene oxide additions). Kinetics of hydration of cement pastes was evaluated by isothermal calorimetry, phase evolution during hydration was determined by X-ray diffraction coupled with quantitative Rietveld analysis and mechanical properties were evaluated by compressive strength. Results indicate that graphene oxide additions provide a faster hydration rate until 24 h and generate a larger amount of C-S-H gel, increasing mechanical strength of the matrix. By the addition of graphene oxide dispersion (0.4% of solid content) at 0.02% by cement weight, cement content reductions of up to 15% may be achieved, maintaining the same compressive strength as the control matrices. From this research, a reduction in cement content to obtain more sustainable construction materials and processes may be achieved.

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Winchester, Michael R., and R. Kenneth Marcus. "Glow Discharge Sputter Atomization for Atomic Absorption Analysis of Nonconducting Powder Samples." Applied Spectroscopy 42, no. 6 (August 1988): 941–44. http://dx.doi.org/10.1366/0003702884430335.

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A methodology has been developed for the analysis of nonconducting (oxide) powder samples by glow discharge atomization-atomic absorption spectrometry (GDA-AAS). The mixing of an oxide powder with a copper host matrix (1:9) allows pressing of a disk sample for glow discharge sputtering. Sample-to-sample precisions are on the order of 3–4% for iron in a geological specimen. The ability to generate analytical working curves is demonstrated for the analysis of iron by mixing Fe (III) and Al (III) oxides in the copper matrix material. The possible utility of the methodology is illustrated by the analysis of iron in an NBS geological reference material. The ability to perform analyses of these sample types suggests its applicability to such matrices as ceramics, glasses, and refractory-based catalysts.

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Du, Xin, Wenjuan Zhang, Bo Liu, Tao Liu, Yu Xiao, Miyuki Taniguchi, and YongLin Ren. "Optimization and Validation of HS-SPME-GCMS Method for Determination of Multifumigant Residues in Grain, Oilseeds, Nuts, and Dry Fruit." Journal of AOAC International 102, no. 6 (November 1, 2019): 1877–83. http://dx.doi.org/10.5740/jaoacint.18-0093.

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Background: Fumigants are approved in many countries and used to treat food, feed, and seed. The amount of residue that remains in fumigated materials is measured and reported. Objective: The optimization and validation of a high-sensitivity headspace solid-phase microextraction gas chromatograph mass spectrometer (HS-SPME-GCMS) method for determination of eight fumigant residues—phosphine, methyl bromide, cyanogen, sulfuryl fluoride, ethylene oxide, propylene oxide, ethyl bromide and ethyl formate—in a range of food matrices were developed. The food matrices included grain, oilseed, dried fruit, and nut. Methods: The new method was used to determine residue levels from a fumigant complex in food matrices by monitoring the change of the absorption of spiked standards and desorption of fumigant from fumigated samples. Results: Based on the observation, the process of physical sorption and chemisorption was defined. The equilibrium time of the sample analysis was chosen at 5 hours. The LODs of the fumigants were in the range of 0.03 to 1.99 ng/g. Response to a range of diluted authentic standards gave significant linear regressions (r2 > 0.9983), and the RSDs were ≤8.7% at the 3 ng/g level of aged spiking standard, except for sulfuryl fluoride, for which the LOD was 1.99 ng/g and the RSD value was 39.7% (6.64 ng/g). Conclusions: The performance of the HS-SPME-GCMS method was more sensitive than the use of a gas syringe, except for sulfuryl fluoride. Highlights: An innovative multifumigant residue detection method based on HS-SPME sampling technology with gas chromatograph-mass selective detection (GC-MSD) analysis was established, including phosphine, methyl bromide, cyanogen, sulfuryl fluoride, ethylene oxide, propylene oxide, ethyl bromide, and ethyl formate; The first report of a sorption study of the process of physical sorption and chemisorption of residual fumigant in fruit and food matrices by an HS-SPME-GCMS method; Consider the effect of time on fumigant behavior in dried fruit, grain, and nut; The LODs of the fumigants were in the range of 0.03 to 1.99 ng/g.

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Du, Xin, Wenjuan Zhang, Bo Liu, Tao Liu, Yu Xiao, Miyuki Taniguchi, and YongLin Ren. "Optimization and Validation of HS-SPME-GCMS Method for Determination of Multifumigant Residues in Grain, Oilseeds, Nuts, and Dry Fruit." Journal of AOAC INTERNATIONAL 102, no. 6 (November 1, 2019): 1877–83. http://dx.doi.org/10.1093/jaoac/102.6.1877.

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Abstract Background: Fumigants are approved in many countries and used to treat food, feed, and seed. The amount of residue that remains in fumigated materials is measured and reported. Objective: The optimization and validation of a high-sensitivity headspace solid-phase microextraction gas chromatograph mass spectrometer (HS-SPME-GCMS) method for determination of eight fumigant residues—phosphine, methyl bromide, cyanogen, sulfuryl fluoride, ethylene oxide, propylene oxide, ethyl bromide and ethyl formate—in a range of food matrices were developed. The food matrices included grain, oilseed, dried fruit, and nut. Methods: The new method was used to determine residue levels from a fumigant complex in food matrices by monitoring the change of the absorption of spiked standards and desorption of fumigant from fumigated samples. Results: Based on the observation, the process of physical sorption and chemisorption was defined. The equilibrium time of the sample analysis was chosen at 5 hours. The LODs of the fumigants were in the range of 0.03 to 1.99 ng/g. Response to a range of diluted authentic standards gave significant linear regressions (r2 > 0.9983), and the RSDs were ≤8.7% at the 3 ng/g level of aged spiking standard, except for sulfuryl fluoride, for which the LOD was 1.99 ng/g and the RSD value was 39.7% (6.64 ng/g). Conclusions: The performance of the HS-SPME-GCMS method was more sensitive than the use of a gas syringe, except for sulfuryl fluoride. Highlights: An innovative multifumigant residue detection method based on HS-SPME sampling technology with gas chromatograph-mass selective detection (GC-MSD) analysis was established, including phosphine, methyl bromide, cyanogen, sulfuryl fluoride, ethylene oxide, propylene oxide, ethyl bromide, and ethyl formate; The first report of a sorption study of the process of physical sorption and chemisorption of residual fumigant in fruit and food matrices by an HS-SPME-GCMS method; Consider the effect of time on fumigant behavior in dried fruit, grain, and nut; The LODs of the fumigants were in the range of 0.03 to 1.99 ng/g.

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Ahamed, Parbhej, and Mohammad Abu Yousuf. "Tissue Matrices Scaffold for the Preparation of Lithium Cobalt Oxide." Advances in Materials Physics and Chemistry 10, no. 05 (2020): 111–24. http://dx.doi.org/10.4236/ampc.2020.105009.

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Celasco, E. "Functionalization Of Graphene And Reduced Graphene Oxide In Different Matrices." Advanced Materials Letters 10, no. 7 (July 1, 2019): 460–64. http://dx.doi.org/10.5185/amlett.2019.2201.

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O'Dwyer, C., V. Lavayen, M. A. Santa Ana, E. Benavente, G. González, and C. M. Sotomayor Torres. "Anisotropic Vanadium Oxide Nanostructured Host Matrices for Lithium Ion Intercalation." Research Letters in Physical Chemistry 2007 (August 28, 2007): 1–5. http://dx.doi.org/10.1155/2007/32528.

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We report on unique high-volume low-dimensional V2O5-based turbostratic nanostructures, prepared using sol-gel synthetic methods from V2O5⋅nH2O xerogels. Electrochemical intercalation of Li+ to form Li0.65V2O5 resulted in a maximum measured charge capacity of 1225 mAh g−1 as the β-LixV2O5 phase. Conductivities of the order of 10−3 S cm−1 were found on compressed-nanotube parallelepipedal samples, which exhibit an anisotropy factor of 70 at room temperature by preferential alignment of the nanotubes. The improved electrochemical properties observed in novel vanadium oxide nanostructured arrays are attributed to the increased volumetric density for ion intercalation, shorter diffusion paths to the intercalation sites, and a high degree of crystallinity of the individual nanotubular host structures.

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Doudrick, Kyle, Takayuki Nosaka, Pierre Herckes, and Paul Westerhoff. "Quantification of graphene and graphene oxide in complex organic matrices." Environmental Science: Nano 2, no. 1 (2015): 60–67. http://dx.doi.org/10.1039/c4en00134f.

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Zerov, V. Yu, Yu V. Kulikov, V. G. Malyarov, I. A. Khrebtov, I. I. Shaganov, and E. B. Shadrin. "Vanadium oxide films with improved characteristics for ir microbolometric matrices." Technical Physics Letters 27, no. 5 (May 2001): 378–80. http://dx.doi.org/10.1134/1.1376757.

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Testa, A. M., S. Foglia, L. Suber, D. Fiorani, Ll Casas, A. Roig, E. Molins, J. M. Grenèche, and J. Tejada. "Unconventional magnetic behavior of iron-oxide nanoparticles in polymeric matrices." Journal of Applied Physics 90, no. 3 (August 2001): 1534–39. http://dx.doi.org/10.1063/1.1383019.

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Petrovic, J., J. Jockovic, S. Ibric, J. Parojcic, and Z. Djuric. "Mathematical modeling of diclofenac sodium's release from polyethylene oxide matrices." Journal of Controlled Release 132, no. 3 (December 2008): e44-e45. http://dx.doi.org/10.1016/j.jconrel.2008.09.029.

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Journal articles on the topic 'Oxide matrices'

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