Size and shape dependent thermodynamic study of nanometals
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Date
2017-07
Authors
Uniyal, Shalini
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Publisher
G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Thermodynamics of nanometals has became a great area of research due to their wide range of applications in many field of science. In the present work four different models i.e. Qi’s model, Qi-Wang’s model, Jiang’s model and Lu’s model have been used to study size and shape dependent melting temperature, Debye temperature and specific heat of Nanometals. These thermodynamic properties are calculated for different sizes and shapes like spherical, regular tetrahedral, regular hexahedral and regular octahedral. Sn, Pb, Bi, In, Cd, Al, Au, and Ag nanometals are taken for the study of size and shape dependent melting temperature, the size and shape dependent study of Debye
temperature is done for Au, Fe, Sn and Co nanometals. Ag and Au nanometals are used for the study of specific heat. The calculated results obtained from these models are compared graphically with available experimental and simulated data.For melting temperature, the results obtained from the equation given by Qi-Wang’s model (for D<15nm) and Qi’s model ( for D>15nm) are found closest to available experimental and simulated data. Jiang’s model is found to be most suitable for the study of Debye temperature of nanometals. For the study of size and shape dependent specific heat, modified specific heat relation of Qi’s model gives better result. Present study reveals that the thermodynamic properties of nanometals are not only size dependent but also varies with shape for small sized nanoparticles. The shape of nanometals for particular size can also be predicted with the help of this study. The shape factor is found to be more pronounced at lower sizes while its effect becomes negligible for higher sizes.
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