The Experts below are selected from a list of 154752 Experts worldwide ranked by ideXlab platform
Sergei Vlassov - One of the best experts on this subject based on the ideXlab platform.
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elasticity and yield strength of pentagonal silver nanowires in situ bending tests
Materials Chemistry and Physics, 2014Co-Authors: Sergei Vlassov, Boris Polyakov, Leonid M Dorogin, Mikk Antsov, Magnus Mets, Madis Umalas, Rando Saar, Runno Lohmus, Ilmar KinkAbstract:This paper reports in situ mechanical characterization of silver nanowires (Ag NWs) inside a scanning electron microscope using a cantilevered beam bending technique. Measurements consisted in controlled bending of a cantilevered NW by the tip of an atomic force microscope glued to the force sensor. Relatively high degree of elasticity followed by either plastic deformation or fracture was observed in bending experiments. Experimental data were numerically fitted into the model based on the elastic beam theory and values of Young Modulus and yield strength were extracted. Measurements were performed on twenty Ag NWs with diameters from 76 nm to 211 nm. Average Young Modulus and yield strength were found to be 90 GPa and 4.8 GPa respectively. In addition, fatigue tests with several millions of cycles were performed and high fatigue resistance of Ag NWs was demonstrated.
Jianli Wang - One of the best experts on this subject based on the ideXlab platform.
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surface effects on elastic properties of silver nanowires contact atomic force microscopy
Physical Review B, 2006Co-Authors: Guangyin Jing, Huiling Duan, Xiaoming Sun, Zhensheng Zhang, Jianli WangAbstract:Received 8 November 2005; revised manuscript received 6 March 2006; published 13 June 2006Silver nanowires with different diameters were synthesized by a hydrothermal chemical method. The elasticproperties of the nanowires with outer diameters ranging from 20 to 140 nm were measured using contactatomic force microscopy. The apparent Young Modulus of the nanowires is found to decrease with the increaseof the diameter. When the diameter of the silver nanowires is larger than 100 nm, the Young Modulus ap-proaches a constant value. The size dependence of the apparent Young Modulus of the silver nanowires isattributed to the surface effect, which includes the effects of the surface stress, the oxidation layer, and thesurface roughness. Thus, a theoretical analysis is presented to explain the size dependence. This analysis isdifferent from the previous models in that both the surface stress and the surface moduli are included in it. Wealso show that the apparent surface Modulus and the surface stress of the silver nanowires can be experimen-tally determined.DOI: 10.1103/PhysRevB.73.235409 PACS number s : 61.46. w, 62.25. g, 62.20.Dc, 68.37.Ps
Claude Favotto - One of the best experts on this subject based on the ideXlab platform.
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Impact of perlite, vermiculite and cement on the Young Modulus of a plaster composite material: Experimental, analytical and numerical approaches
Composites Part B: Engineering, 2016Co-Authors: Samina Abidi, Y. Joliff, Claude FavottoAbstract:The mechanical behavior of a new composite material used in building construction is studied in this work. The composite panel results of combination of a calcium sulfate hydrates matrix mainly water and inorganic mineral additives. The effective Young Modulus of the composite is measured by three bending test. Analytical and numerical models are used to determine the composite Young Modulus which can be expected vs the type and rate of additives. The experimental values are compared with analytical and numerical results. The results from models are near or lightly lower than the experimental values and allow an estimation of the effective properties which can be expected for the new composite developed. (C) 2016 Elsevier Ltd. All rights reserved.
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Impact of perlite, vermiculite and cement on the Young Modulus of a plaster composite material: Experimental, analytical and numerical approaches
Composites Part B: Engineering, 2016Co-Authors: Samina Abidi, Y. Joliff, Claude FavottoAbstract:The mechanical behavior of a new composite material used in building construction is studied in this work. The composite panel results of combination of a calcium sulfate hydrates matrix mainly water and inorganic mineral additives. The effective Young Modulus of the composite is measured by three bending test. Analytical and numerical models are used to determine the composite Young Modulus which can be expected vs the type and rate of additives. The experimental values are compared with analytical and numerical results. The results from models are near or lightly lower than the experimental values and allow an estimation of the effective properties which can be expected for the new composite developed. (C) 2016 Elsevier Ltd. All rights reserved.
Ilmar Kink - One of the best experts on this subject based on the ideXlab platform.
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elasticity and yield strength of pentagonal silver nanowires in situ bending tests
Materials Chemistry and Physics, 2014Co-Authors: Sergei Vlassov, Boris Polyakov, Leonid M Dorogin, Mikk Antsov, Magnus Mets, Madis Umalas, Rando Saar, Runno Lohmus, Ilmar KinkAbstract:This paper reports in situ mechanical characterization of silver nanowires (Ag NWs) inside a scanning electron microscope using a cantilevered beam bending technique. Measurements consisted in controlled bending of a cantilevered NW by the tip of an atomic force microscope glued to the force sensor. Relatively high degree of elasticity followed by either plastic deformation or fracture was observed in bending experiments. Experimental data were numerically fitted into the model based on the elastic beam theory and values of Young Modulus and yield strength were extracted. Measurements were performed on twenty Ag NWs with diameters from 76 nm to 211 nm. Average Young Modulus and yield strength were found to be 90 GPa and 4.8 GPa respectively. In addition, fatigue tests with several millions of cycles were performed and high fatigue resistance of Ag NWs was demonstrated.
Branko Matović - One of the best experts on this subject based on the ideXlab platform.
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Thermal shock damage characterization of refractory composites
Ceramics International, 2008Co-Authors: Stanisava Marenovic, Marija Dimitrijević, Tatjana Volkov Husović, Branko MatovićAbstract:The possibility of using dolomite and bauxite for synthesis of high temperature castable was studied. Behavior of the material in conditions of rapid temperature changes was investigated. Water quench test was applied to determine thermal shock resistance. Level of surface deterioration before and during quenching was monitored by image analysis. Dynamic Young Modulus of elasticity was determinated by ultrasonic measurements. The results show that dolomite and bauxite can be effective raw materials for low temperature synthesis of refractory composites.
