المؤلفون: A. A. Kulikova, O. V. Dem'yanenko, N. O. Kopanitsa

المصدر: Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture. 22:139-152

مصطلحات موضوعية: Cement, Aggregate (composite), Materials science, Silica fume, 0211 other engineering and technologies, Mixing (process engineering), 020101 civil engineering, 02 engineering and technology, Industrial waste, 0201 civil engineering, Compressive strength, 021105 building & construction, Composite material, Nano silicon dioxide, Chemical composition

الوصف: The research developments in materials science in the construction field concerning the formulation and production process of fine-grain concrete are aimed at the formation of structure and properties that provide the appropriate performance characteristics. The literature review and experimental data on the concrete treatment made show that the required quality of concrete can be achieved by changing the concrete mixture composition, activation of aggregate and mixing water, introduction of multi-purpose modifying additives, different approaches, etc. The paper presents the development of the effective multi-purpose additive consisting of such industrial wastes as marble-microcalcite, nano silicon dioxide, microsilica, and peat hermally modified at 600 °C. The influence of this additive on hydrated cement and concrete properties is studied herein. It is shown that the introduction of the multi-purpose additive in an amount of 5 % with a decrease in the cement consumption, improves the compressive strength of hydrated cement stone up to 69 %. The chemical composition of new formations of modified hydrated cement is determined by the physicochemical analysis.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::4a067d0ac7fe3fcf0ea056e72cea328dTest
https://doi.org/10.31675/1607-1859-2020-22-5-139-152Test

المؤلفون: Nabaa S. Radhi, Zainab S. Al-Khafaji, Nawal Mohammed Dawood

المصدر: Materials Science Forum. 1002:33-43

مصطلحات موضوعية: 010302 applied physics, Materials science, Mechanical Engineering, Metallurgy, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Indentation hardness, Corrosion, Carbide, Nickel, Composite coating, chemistry, Mechanics of Materials, 0103 physical sciences, General Materials Science, 0210 nano-technology, Electroplating, Nano silicon, Nanoscopic scale

الوصف: This research signifies an attempt to apply composite coating by co-deposition coating and assessing, enhancement the Nickel coatings features, by adding the particles of silicon-carbide to solution of electrodeposited. Stainless steel specimens have been subject to electroplating coating utilizing Nickel and nanosilicon carbide particles (70-100 nm) with various amounts (16, 24, 32 and 40) g/L. After coating, the specimens were tested by SEM, AFM, impeded in a solution with 3.5 percent NaCl to investigate the corrosion performance. Then testing the microhardness, and wear resistance. Results obtained from this work showed a great reduction in corrosion currents caused by adding of inert nanoparticles. These enhancements had been detected on all conducted tests for corrosion and wear.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::6fab132b1969cd3c4946de6dd01cdec7Test
https://doi.org/10.4028/www.scientific.net/msf.1002.33Test

المؤلفون: Hyang-Yeon Kim, Nurzhan Umirov, Deok-Ho Seo, Sung-Soo Kim

المصدر: ACS Applied Materials & Interfaces. 12:17406-17414

مصطلحات موضوعية: Materials science, Silicon, 020209 energy, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Anode, Silicon alloy, chemistry, Amorphous matrix, 0202 electrical engineering, electronic engineering, information engineering, Energy density, General Materials Science, Graphite, Melt spinning, Composite material, 0210 nano-technology, Nano silicon

الوصف: Silicon fascinates with incredibly high theoretical energy density as an anode material and considered as a primary candidate to replace well-established graphite. However, further commercialization is hindered by the abnormal volume changes of Si in every single cycle. Silicon embedded in a buffer matrix using the melt-spinning process is a promising approach; however, its metastable nature significantly reduces the microstructure homogeneity, the quality of the composition, and, therefore, the electrochemical performances. Herein, we developed a new approach to design a high-performance Si-alloy with improved microstructure uniformity and electrochemical properties. Namely, annealing at a certain temperature of the melt-spun amorphous alloy ribbon allowed us to evenly distribute Si nanocrystallites in the microstructure with control of average grain size. As a result, the Si-alloy electrode delivers an initial discharge capacity of 900 mAh g

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6224d40aa9db57d980bca7bfa6f8de3dTest
https://doi.org/10.1021/acsami.9b21997Test

المؤلفون: Xu Li, Shengkun Wei, Xuelian Wu, Liangyong Zhang, Yin Shen

المصدر: Molecular Simulation. 46:468-475

مصطلحات موضوعية: Polypropylene, Materials science, 010304 chemical physics, General Chemical Engineering, Doping, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Mechanism (engineering), chemistry.chemical_compound, chemistry, Chemical engineering, Modeling and Simulation, 0103 physical sciences, General Materials Science, 0210 nano-technology, Nano silicon dioxide, Information Systems

الوصف: An unmodified polypropylene (PP) model and a modified model with 2% nano-silicon dioxide content were built initially, and then the mechanical parameters of the two models were compared by ...

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d467f9ec96370bc63ea6edb686924b8cTest
https://doi.org/10.1080/08927022.2020.1729981Test

المؤلفون: Gilberto S. Falk, G.P. Shinhe, A.P. Novaes de Oliveira, Elisângela Guzi de Moraes, L. B. Teixeira

المصدر: Ceramics International. 45:21618-21624

مصطلحات موضوعية: 010302 applied physics, Alternative methods, Materials science, Process Chemistry and Technology, Nanoparticle, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Amorphous solid, Silica nanoparticles, Chemical engineering, Volume (thermodynamics), Impurity, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, 0210 nano-technology, Bagasse, Nano silicon

الوصف: Nanoparticles of SiO 2 were synthesized via sol-gel route using sugarcane bagasse ash as a silica source. The influence of the synthesis operational conditions, as well as, the use of different purification methods, such as chemical treatments, on morphological, structural and chemical properties of the synthesized nanoparticles were evaluated. The results showed that the sol-gel synthesis is a feasible alternative method for obtaining silica xerogel using ashes with high impurities contents, such as iron and aluminum oxide. Amorphous SiO 2 nanoparticles with an average size of ~10 nm were obtained by controlling the main synthesis variables (pH, temperature and SiO 2 /H 2 O molar ratio). The purification methods investigated allowed to obtain nanosilica with different levels of purity, greater than 96%. The combined morphological features, i.e., large specific surface and pore volume, allow these materials to have applications in several technological fields, such as optical, electronics and biomedical and additionally, as a source of nano-silicon via magnesiothermal reduction.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d1234e7078b369632e18d050d595a8d5Test
https://doi.org/10.1016/j.ceramint.2019.07.157Test

المؤلفون: P. Muhamed Ashraf, Ahana Mohan

المصدر: Langmuir. 35:4328-4335

مصطلحات موضوعية: Materials science, business.industry, Environmental engineering, 02 engineering and technology, Surfaces and Interfaces, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Biofouling, Aquaculture, Superhydrophilicity, Electrochemistry, General Materials Science, 0210 nano-technology, business, Nano silicon dioxide, Cage, Productivity, Spectroscopy

الوصف: Biofouling in aquaculture cages negatively affects the farm productivity, and it requires huge sums of money and labor for its management. A superhydrophilic pseudozwitterionic hydrogel, N-isopropylacrylamide (NIPA) + [2-(methacryloyloxy)ethyl]trimethylammonium (TMA) + 3-sulfopropyl methacrylate (SA) copolymer, is considered as a potential antifouling agent. The present study aimed to synthesize a nano silicon oxide reinforced NIPA-TMA-SA mixed-charged zwitterionic hydrogel over polyaniline-coated polyethylene aquaculture cage nets through the in situ microwave reaction and to test its biofouling resistance. The study highlighted the formation of stable coating over polyethylene, four different treatments, and their effective inhibition of fouling compared with the untreated one. Six month's immersions of treated nettings in the estuarine environments demonstrated that the biofouling inhibition by nano silicon oxide reinforced zwitterionic hydrogel-coated polyethylene was unable to satisfy the industrial standards but made the samples free from hard-shelled fouling organisms compared with untreated controls. More research is needed to improve the quality of the coatings. The mixed-charged zwitterionic hydrogel with nano silicon oxide showed medium hydrophilic nature. Fourier transform infrared, scanning electron microscopy, and spectroscopic evaluation showed the successful formation of hydrogel over the aquaculture cage net. Nano silicon oxide reinforced in the matrix through hydrogen and coordination bonding between NH

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9df6cc6066ba7f347f0960055c34a27fTest
https://doi.org/10.1021/acs.langmuir.8b04071Test

المؤلفون: Zehba A. Al-Ahmed, Rania Zaky

المصدر: Silicon. 11:2811-2818

مصطلحات موضوعية: 010302 applied physics, Materials science, Inorganic chemistry, Potentiometric titration, Protonation, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Environmentally friendly, Electronic, Optical and Magnetic Materials, Solvent, chemistry.chemical_compound, chemistry, 0103 physical sciences, Tetrachloride, 0210 nano-technology, Nano silicon, Ball mill, Acetamide

الوصف: The nano-silicon tetrachloride was prepared by an effective and environmentally friendly ball milling technique. The protonation constants of 2-oxo-N-(pyridine-2-yl)-2-(2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)acetamide (H2L) and the stability constants of its nano silicon complexes were estimated by the potentiometric technique at different temperatures 298, 308 & 318°K.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::a7e42ea1a1f814956bcd3d1b1ecda543Test
https://doi.org/10.1007/s12633-019-0075-6Test

المؤلفون: Siddhartha, Anant Krishan Pun, Akant Kumar Singh

المصدر: Silicon. 11:1885-1901

مصطلحات موضوعية: 010302 applied physics, Materials science, Silicon dioxide, Design of experiments, Glass fiber, Vinyl ester, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, 01 natural sciences, Electronic, Optical and Magnetic Materials, Taguchi methods, chemistry.chemical_compound, chemistry, Filler (materials), 0103 physical sciences, engineering, Erosion, Composite material, 0210 nano-technology, Nano silicon dioxide

الوصف: This article presents the findings on thermo-mechanical and erosion wear characteristics of micro silicon dioxide (SiO2) fillers filled woven glass fiber based vinyl ester hybrid composites (MWGVHCs) as well as nano SiO2 filled woven glass fiber-vinyl ester hybrid composites (NWGVHCs). Wovenglass-vinyl ester based hybrid composites are developed, filled with 5wt.% and 10wt.% of micro and nano SiO2 fillers, respectively. Performance of filler filled composites is compared with the filler less composites. Thermo-mechanical analysis of hybrid composites is done as per ASTM standards. Angles of impact (30°, 45°, 60°, 75° and 90o), impact velocities (30, 55 and 80 m/s) and erodent size of 300, 450 and 600 µm is used for erosion wear test of fabricated composites. Taguchi statistical method is employed for design of experiments to optimize the process parameters. Findings reveal that hybrid composites filled with 10wt% of nano SiO2 filler performed best amongst all the in-class composites. In order to optimize the performance of fabricated composites VIKOR method is also implemented.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::c874a8e899bad072561b7a99593034aaTest
https://doi.org/10.1007/s12633-018-0007-xTest

المؤلفون: Benlong Su, Bipin Kumar Gond, Yulei Wang, Jiqiang Wu, Chuanbing Zhang

المصدر: Experimental Techniques. 43:81-89

مصطلحات موضوعية: Friction coefficient, Materials science, Mechanical Engineering, 02 engineering and technology, Carbon black, 01 natural sciences, 010309 optics, Normal load, 020303 mechanical engineering & transports, 0203 mechanical engineering, Skid (automobile), Natural rubber, Mechanics of Materials, visual_art, 0103 physical sciences, visual_art.visual_art_medium, Tread, Composite material, Nano silicon, Contact pressure

الوصف: Wet skid resistance is one of the basic properties for tread rubber, which plays an important role in driving performance of vehicles. Firstly, a new test device has been developed for testing wet skid resistance of tread rubber. Then, effect of filled nano silicon, water film depth, normal load and sliding velocity on friction properties of tread rubber have been studied, and contact pressure under different pavement parameters of Rsm, Ra also has been investigated. Finally, friction surface morphology of tread rubber has been investigated by OLYMPUS-DSX510 Optical Digital Microscope. Results indicate that nano silicon instead of silica (white carbon black) can significantly improve wet skid resistance with the same mechanical properties, replacement ratio of 40% is the best; friction coefficient of tread rubber block decreases when the normal load increases, however, it increases and then decreases when sliding velocity increases under dry and wet conditions; contact pressure increases with the increase of Rsm, however, it decreases when Ra increases.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::53a954eaed4ccdc60d385b857389be32Test
https://doi.org/10.1007/s40799-018-0272-zTest

المؤلفون: Mona Alharbi, Nada Benajiba, Rokayya Sami, Manal Almatrafi, Mahmoud Helal, Abeer Elhakem

المصدر: Membranes
Volume 11
Issue 2
Membranes, Vol 11, Iss 140, p 140 (2021)

مصطلحات موضوعية: Filtration and Separation, 02 engineering and technology, engineering.material, lcsh:Chemical technology, medicine.disease_cause, Shelf life, microbial activity, Article, Chitosan, chemistry.chemical_compound, 0404 agricultural biotechnology, Coating, Mold, medicine, Chemical Engineering (miscellaneous), lcsh:TP1-1185, Food science, lcsh:Chemical engineering, Nisin, cantaloupe, Process Chemistry and Technology, technology, industry, and agriculture, lcsh:TP155-156, 04 agricultural and veterinary sciences, 021001 nanoscience & nanotechnology, Antimicrobial, 040401 food science, shelf-life, chemistry, engineering, Postharvest, nano-silicon dioxide, chitosan, 0210 nano-technology, Nano silicon dioxide

الوصف: The prime objective of the research was to explore the coating effects of chitosan and nano-silicon dioxide with nisin as an antimicrobial agent on physicochemical properties, microbiological stability, and sensorial quality changes during the storage at 4 °C. The combination of nano-material and chitosan in addition to nisin was effective for reducing the postharvest attributes of fresh-cut cantaloupes in addition to the highest score in sensory evaluation. Chitosan coating treatment enhanced the microbiological quality 2.50 log CFU/g and 1.87 log CFU/g for aerobic counts and mold/yeasts populations, respectively. In a word, the combination of chitosan/nano-silica/nisin treatment was the best condition for fresh-cut cantaloupe shelf life extension by maintaining color, vitamin C 22.29 mg/100g, peroxidase activity 8.06 U/min.g, and other microbiological tests up to storage time of 8 days.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7aa5703d45c26b48756ed79d26a557cTest
https://doi.org/10.3390/membranes11020140Test