توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱An Investigation of Surface Energy of Gold Nanoparticles; Molecular Dynamic Study
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
Surface energy of Gold nanoparticles (1–6 nm) was studied by using molecular dynamic simulation. The kinetic, potential, total energy and the number of neighbouring atoms from center to surface were investigated to obtain more details. According to our results potential energy in the particles were controlled by numbers of neighbouring atoms. Unlike what has been thought, surface energy is not restricted to surface monolayer and it is extended within nanoparticles. In fact surface energy has layer–by–layer effect (surface effect). Consequently, in nano–scale, we may reach the particles which all atoms are only affected by surface effect with decreasing of the size of the particles .It will be forecast that the nanoparticles have a critical size; particles smaller than critical size are fully affected by surface effect and there will be no bulk materials, so that the structure of nanoparticles can be divided into two regions; bulk zone and surface zone. But when the sizes of the particles become smaller than critical size the structure of nanoparticles should be considered as one region (surface zone).<\div>

۲Size–Effect on the Mechanical Properties of Nanowires via Boundary Cauchy–Born Method
نویسنده(ها): ،
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
In this paper a novel multi–scale method for modelling boundary and size effects has been proposed and their effects on mechanical properties of nanowires have been investigated. Boundary Cauchy–Born (BCB) method which is based on Cauchy–Born (CB) rule is capable of computing the accurate strain and stress states in whole of the continuous medium especially in its boundaries. In order to solve real problems with this new method, it has to be merged with Finite Element method (FEM) in which the stress and strain of quadratures are computed from CB rule. In other world, the quadratures indicate the real atomistic behavior. Since BCB shows accurate results in whole of the continua, mechanical properties of nanowires which are strongly dependent on their size and surface to volume ratio are studied via BCB method.<\div>
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