Готові списки джерел за темами / ZnO Nanoceramics

Добірка наукової літератури з теми "ZnO Nanoceramics"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "ZnO Nanoceramics"

1

Lysenko, Vladimir. "Different-Oxides Nanoceramics Microhardness." International Journal of Nanoscience 13, no. 04 (August 2014): 1440003. http://dx.doi.org/10.1142/s0219581x14400031.

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With help of the method of the spark plasma sintering (SPS), the fine-grained (of micron approximately) ceramics based on various alumina nanopowders had created. A comparison of microhardness of ceramic samples obtained from 11 alumina nanopowders and 2 their composites was held. Microhardness of the ceramics obtained both by SPS, and by the traditional method (at successive pressing and sintering) is compared. The dependence of ceramics microhardness on the phase composition of the initial nanopowder and the average size of its particles was investigated. Besides alumina nanopowders ( Al 2 O 3), there were compared microhardness of ceramics from other 10 nanopowders of oxides ( SiO 2, ZnO , Fe 3 O 4, Gd 2 O 3, CuO , WO 3, TiO 2, Y 2 O 3, ZrO 2, MgO ) obtained both by SPS, and by the traditional method. It is obtained that the microhardness of the ceramics created on the method of the spark plasma sintering, is significantly higher than a microhardness of the ceramics obtained by the traditional method; at the SPS method the average size of grain in ceramics decreases (to 1 micron and less).
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2

NGUYEN, Van Son, Véronique JUBERA, Alain GARCIA, Claude LUCAT, and Hélène DEBEDA. "Towards hydrogen detection at room temperature with printed ZnO nanoceramics films activated with halogen light." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, CICMT (September 1, 2015): 000224–29. http://dx.doi.org/10.4071/cicmt-wp13.

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Though semiconducting properties of ZnO have been extensively investigated under hazardous gases, research is still necessary for low-cost sensors working at room temperature. Study of printed ZnO nanopowders based-sensor has been undertaken for hydrogen detection. A ZnO paste made with commercial nanopowders is deposited on interdigitated Pt electrodes and sintered at 400°C. ZnO layer structure and morphology are first examined by XRD, SEM and emission/excitation spectra prior to the study of the effect of UV-light on the electrical conduction of the semiconductor oxide. Then, the response to hydrogen shows that low UV-light provided by a halogen light enhances gas sensitivity and allows detection at room temperature with sensitivity equivalent to those obtained in dark condition at 150°C. A sensitivity S≈44% is obtained for 300 ppm hydrogen at room temperature under halogen lamp illumination whereas a sensitivity S≈38% is measured at 150°C in the dark. Moreover, it is demonstrated that very low UV-light power (15 μW/mm2) provided by the halogen lamp is sufficient to give sensitivities as high as those obtained with UV LED (7.7 mW/mm2). These results are comparable to those obtained for 1 or 2D ZnO nanostructures working at room temperature or at temperature until 250 °C.
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3

Liu, Ming, Pengcheng Li, Yong Huang, Liang Cheng, Yongming Hu, Zilong Tang, and Wanping Chen. "Room-Temperature Hydrogen-Sensing Capabilities of Pt-SnO2 and Pt-ZnO Composite Nanoceramics Occur via Two Different Mechanisms." Nanomaterials 11, no. 2 (February 17, 2021): 504. http://dx.doi.org/10.3390/nano11020504.

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Анотація:
Impressive room-temperature gas-sensing capabilities have been reported for nanomaterials of many metal oxides, including SnO2, ZnO, TiO2, WO3, and Fe2O3, while little attention has been paid to the intrinsic difference among them. Pt-SnO2 and Pt-ZnO composite nanoceramics have been prepared through convenient pressing and sintering. The former shows strong and stable responses to hydrogen in 20% O2-N2 (synthetic air) at room temperature, while the responses to hydrogen in N2 cannot be stabilized in limited times; the latter shows strong and stable responses to hydrogen in N2, while the responses to hydrogen in synthetic air are greatly depressed. Further analyses reveal that for Pt-ZnO, the responses result from the reaction between hydrogen and oxygen chemisorbed on ZnO; while for Pt-SnO2, the responses result from two reactions of hydrogen, one is that with oxygen chemisorbed on SnO2 and the other is hydrogen chemisorption on SnO2. These results reveal two different room-temperature hydrogen-sensing mechanisms among MOXs, which results in highly contrasting room-temperature hydrogen-sensing capabilities attractive for sensing hydrogen in oxygen-contained and oxygen-free environments, separately.
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4

Nguyen, Van Son, Véronique Jubera, Alain Garcia, and Hélène Debéda. "Toward hydrogen detection at room temperature with printed ZnO nanoceramics films activated with halogen lighting." Applied Surface Science 357 (December 2015): 14–21. http://dx.doi.org/10.1016/j.apsusc.2015.08.137.

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5

Das, Bikram Keshari, Tanushree Das, Kajal Parashar, S. K. S. Parashar, Rajeev Kumar, A. V. Anupama, and Balaram Sahoo. "Effect of Cr Doping on Structural, Optical and Dielectric Properties of ZnO Nanoceramics Synthesized by Mechanical Alloying." Electronic Materials Letters 16, no. 3 (March 2, 2020): 255–63. http://dx.doi.org/10.1007/s13391-020-00209-0.

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6

Das, Bikram Keshari, Tanushree Das, Kajal Parashar, S. K. S. Parashar, Rajeev Kumar, Harish K. Choudhary, Vijay B. Khopkar, A. V. Anupama, and Balaram Sahoo. "Investigation of structural, morphological and NTCR behaviour of Cu-doped ZnO nanoceramics synthesized by high energy ball milling." Materials Chemistry and Physics 221 (January 2019): 419–29. http://dx.doi.org/10.1016/j.matchemphys.2018.09.056.

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7

Das, T., B. K. Das, K. Parashar, and S. K. S. Parashar. "Temperature and Frequency Dependence Electrical Properties of Zn1-xCaxO Nanoceramic." Acta Physica Polonica A 130, no. 6 (December 2016): 1358–62. http://dx.doi.org/10.12693/aphyspola.130.1358.

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8

Sherikar, Baburao N., Balaram Sahoo, and Arun M. Umarji. "Effect of fuel and fuel to oxidizer ratio in solution combustion synthesis of nanoceramic powders: MgO, CaO and ZnO." Solid State Sciences 109 (November 2020): 106426. http://dx.doi.org/10.1016/j.solidstatesciences.2020.106426.

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9

H, Mobarak, Paul SC, Islam MS, Akter S, and Sohag K. "Study on the Frequency and Temperature Dependent Electrical Properties of MnO and PbO Doped ZnO Nanoceramics." Journal of Advanced Chemical Engineering 08, no. 01 (2018). http://dx.doi.org/10.4172/2090-4568.1000183.

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10

Das, Bikram Keshari, Tanushree Das, and Dipteerekha Das. "Structural and electrical properties of mechanically alloyed ZnO nanoceramic for NTC thermistor application." Journal of Materials Science: Materials in Electronics 34, no. 3 (January 2023). http://dx.doi.org/10.1007/s10854-022-09670-z.

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Дисертації з теми "ZnO Nanoceramics"

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Khopkar, Vijay B. "Investigation into the Synthesis, Structure and Dielectric Property of Lead-Free Double Perovskite Structured Materials." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5048.

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Анотація:
Lead based materials have shown to be important materials showing high piezoelectricity, colossal dielectric constant, ferroelectricity along with their good mechanical behaviour and resistance to corrosion. As a result, they have wide range of applications such as sensors, actuators, detectors, batteries, lead-painting pigments etc. However, due to high toxicity of lead and its nature to accumulate in the environment with gradually increasing concentrations, increasingly more health hazards are encountered. In this regard, replacing these lead based materials by lead free material with similar/higher level of dielectric properties is the driving force for research on lead free dielectric materials. In this work, we have studied few double perovskites structured dielectric materials and their solid solutions. The present work attempts to understand synthesis, structure and dielectric property of lead free double perovskite structure BaFe0.5Nb0.5O3, BaFe0.5Ta0.5O3 and solid solution of (x) BaFe0.5Nb0.5O3–(1-x)KNbO3 (x= 0, 0.2, 0.4, 0.6, 0.8 and 1). This thesis work organized in seven chapters as given below. First two chapters describe the motivation behind the work and experimental technique used for synthesis and characterizes materials, chapter 3, 4, 5 and 6 described investigated material and chapter 7 summarizes the thesis. Details of chapters as follows,
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2

Sherikar, Baburao Neelkantappa. "Investigations of Solution Combustion Process and their Utilization for Bioceramic Applications." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/3015.

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Анотація:
Solution combustion synthesis (SCS) with its origin at IPC department of IISc has been widely practiced for synthesis of oxide materials. It is simple and low cost process, with energy and time savings that can be used to produce homogeneous, high purity, uniformly doped, nano crystalline ceramic powders. The powders characteristics such as crystallite size and surface area are primarily governed by enthalpy, flame temperature of combustion, fuel and fuel to oxidizer ratio ( F/O). In the present work an attempt has been made to investigate the process in order to exercise a control over the phase formation and nature of the product. Initial part of the work deals with the effect of fuel to oxidizer ratio on the powder properties of binary oxides with urea as fuel. The variation of adiabatic flame temperatures are calculated theoretically for different F/O ratios according to thermodynamic concept and correlated with the observed flame temperatures. Difference in the measured flame temperature and theoretical flame temperature in the fuel rich region is explained on the basis of incomplete combustion model. The effect of decomposition temperature difference of fuel and oxidizer, solubility of reactants on exothermicity of combustion reaction taking aluminiumnitrate system for various fuels is investigated. The effect of mixed fuel approach is studied by using the urea-glycine mixed fuel system using aluminium nitrate as oxidizer and employed for successful synthesis of the gamma alumina. Further Compaction behavior of SCS nano ceramic powders is studied by using Universal testing machine and the effect of F/O ratio, on agglomeration strength, aggregation strength of powder is investigated. Very few reports can be found on usage of SCS ceramic powder for biomaterial applications. By using these investigations a pyroxene series Diopside (CaMgSi2O6) silicate material is synthesized by SCS. Effect of different fuels on Diopside (DP) phase formation is investigated. Finally the DP and DP-ZnO composites, made by using Uniaxial hot pressing are investigated for their antibacterial, cytocompatibility properties. Antibacterial activity of E.Coli bacterium of Diopside powders was dose dependent type. Results of the bioactivity investigations shown flattened MC3T3 mouse osteoblast cells and MC C2C12 Myoblast cells and linkage bridges formed between them on Diopside and DP-ZnO surfaces show cyto compatibility and MTT results showed that percentage of ZnO needs to be tailored between 0-10 in order to achieve maximum cytocompatibility coupled with antibacterial property.
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3

Sherikar, Baburao Neelkantappa. "Investigations of Solution Combustion Process and their Utilization for Bioceramic Applications." Thesis, 2014. http://hdl.handle.net/2005/3015.

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Анотація:
Solution combustion synthesis (SCS) with its origin at IPC department of IISc has been widely practiced for synthesis of oxide materials. It is simple and low cost process, with energy and time savings that can be used to produce homogeneous, high purity, uniformly doped, nano crystalline ceramic powders. The powders characteristics such as crystallite size and surface area are primarily governed by enthalpy, flame temperature of combustion, fuel and fuel to oxidizer ratio ( F/O). In the present work an attempt has been made to investigate the process in order to exercise a control over the phase formation and nature of the product. Initial part of the work deals with the effect of fuel to oxidizer ratio on the powder properties of binary oxides with urea as fuel. The variation of adiabatic flame temperatures are calculated theoretically for different F/O ratios according to thermodynamic concept and correlated with the observed flame temperatures. Difference in the measured flame temperature and theoretical flame temperature in the fuel rich region is explained on the basis of incomplete combustion model. The effect of decomposition temperature difference of fuel and oxidizer, solubility of reactants on exothermicity of combustion reaction taking aluminiumnitrate system for various fuels is investigated. The effect of mixed fuel approach is studied by using the urea-glycine mixed fuel system using aluminium nitrate as oxidizer and employed for successful synthesis of the gamma alumina. Further Compaction behavior of SCS nano ceramic powders is studied by using Universal testing machine and the effect of F/O ratio, on agglomeration strength, aggregation strength of powder is investigated. Very few reports can be found on usage of SCS ceramic powder for biomaterial applications. By using these investigations a pyroxene series Diopside (CaMgSi2O6) silicate material is synthesized by SCS. Effect of different fuels on Diopside (DP) phase formation is investigated. Finally the DP and DP-ZnO composites, made by using Uniaxial hot pressing are investigated for their antibacterial, cytocompatibility properties. Antibacterial activity of E.Coli bacterium of Diopside powders was dose dependent type. Results of the bioactivity investigations shown flattened MC3T3 mouse osteoblast cells and MC C2C12 Myoblast cells and linkage bridges formed between them on Diopside and DP-ZnO surfaces show cyto compatibility and MTT results showed that percentage of ZnO needs to be tailored between 0-10 in order to achieve maximum cytocompatibility coupled with antibacterial property.
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Частини книг з теми "ZnO Nanoceramics"

1

Kasinathan, Kaviyarasu. "Green Synthesis for Advanced Materials of Graphene Oxide (GO) with ZnO for Enhanced Photocatalytic Activity at Room Temperature." In Handbook of Nanoceramic and Nanocomposite Coatings and Materials, 115–27. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-12-799947-0.00005-5.

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Тези доповідей конференцій з теми "ZnO Nanoceramics"

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Das, Tanushree, Dipteerekha Das, Kajal Parashar, S. K. S. Parashar, and Bikram Keshari Das. "Complex modulus spectroscopy of Zn1-xSrxO nanoceramics." In 2ND INTERNATIONAL CONFERENCE ON EMERGING SMART MATERIALS IN APPLIED CHEMISTRY (ESMAC-2021): ESMAC-2021. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0125876.

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