Begell House Inc.
Nanoscience and Technology: An International Journal
NST
2572-4258
3
3
2012
MODELING THE INITIAL STAGE OF FORMATION OF NANOWHISKERS ON AN ACTIVATED SUBSTRATE. PART 1. THEORY FOUNDATIONS
193-209
10.1615/NanomechanicsSciTechnolIntJ.v3.i3.10
A. V.
Vakhrushev
Institute of Mechanics, Ural Branch of the Russian Academy of Sciences,
Izhevsk, Russia; Kalashnikov Izhevsk State Technical University, Izhevsk, Russia
A. V.
Severyukhin
Institute of Mechanics, Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia
O. Yu.
Severyukhina
Institute of Mechanics, Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia
whisker growth
simulation of molecular dynamics
A mathematical model based on the methods of molecular dynamics is developed to describe the initial stage of formation of nanowhiskers on an activated substrate. The connection between the proposed model and existing phenomenological models of whisker growth is established. The range of the values of process parameters ensuring a steady growth of nanowhiskers has been defined.
MODELING THE INITIAL STAGE OF FORMATION OF NANOWHISKERS ON AN ACTIVATED SUBSTRATE. PART 2. NUMERICAL INVESTIGATION OF THE STRUCTURE AND PROPERTIES OF Au−Si NANOWHISKERS ON A SILICON SUBSTRATE
211-237
10.1615/NanomechanicsSciTechnolIntJ.v3.i3.20
A. V.
Vakhrushev
Institute of Mechanics, Ural Branch of the Russian Academy of Sciences,
Izhevsk, Russia; Kalashnikov Izhevsk State Technical University, Izhevsk, Russia
A. V.
Severyukhin
Institute of Mechanics, Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia
O. Yu.
Severyukhina
Institute of Mechanics, Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia
whisker growth
simulation of molecular dynamics
Calculations of the initial stage of nanowhisker growth on silicon surfaces were performed using the method of simulation of molecular dynamics. It is shown that the diffusion flux contributes significantly to the formation of nanowhiskers.
SMART MATERIALS WITH ELECTRICALLY CONTROLLED PROPERTIES. ELECTRORHEOLOGICAL SUSPENSIONS WITH A NANOSIZED POLYMERIC DISPERSED PHASE. PART 2. EXPERIMENTAL INVESTIGATION OF ELECTRORHEOLOGICAL SUSPENSIONS BASED ON POLYIMIDES
239-281
10.1615/NanomechanicsSciTechnolIntJ.v3.i3.30
Yuri G.
Yanovsky
Institute of Applied Mechanics, Russian Academy of Sciences, 7 Leningradsky
Ave., Moscow, 125040, Russia
Nikolay A.
Semenov
Federal State Institution of Science Institute of Applied Mechanics of the Russian
Academy of Sciences, 7 Leningradsky Prospekt, p.1, Moscow 125040, Russia
G. Ya.
Sidorova
Institute of Applied Mechanics, Russian Academy of Sciences, 32A Lenin Ave., Moscow, 119991, Russia
Yulia N.
Karnet
Institute of Applied Mechanics, Russian Academy of Sciences,7 Leningradsky Ave., Moscow, 125040, Russia
polyimides
nanoparticles
electrophysical properties
electrorheological suspensions
flow curves
dynamic electrorheological characteristics
The electrorheological properties of a new generation of "smart materials", namely, electrorheological suspensions (ERS) based on nanosized polymeric particles of polyimides in the medium of methyl silicone, are discussed. The optimal structures of polyimides with a high electrorheological response were predicted within the framework of quantum mechanical investigations on the previous stages of the authors' research (Yanovsky et al., 2011) and synthesized at the Federal Budget State Research Establishment "Institute of Applied Mechanics of the Russian Academy of Sciences". For the obtained polyamide particles with a different chemical structure, the electrophysical properties (sizes of particles and of their aggregates, size distribution, specific surface, double electric layer potential, electrorheological response on shear in electric fields of different intensities) were investigated. The chemical composition of polyimides with optimal electrorheological characteristics has been established. Based on these specimens, electrorheological suspensions with different concentrations of the dispersed phase have been obtained. For the first time, the curves of flow, dynamic rheological characteristics, namely, the moduli of elasticity and losses, loss-angle tangent of similar electrorheological suspensions based on nanosized particles of polyimides were described in a wide range of rheological parameters: the rates of shearing, frequencies of periodic sinusoidal small-amplitude deformation, and temperatures at different concentrations of dispersed phase. The presence of a high-power electrorheological effect in these materials as compared to the electrorheological suspensions based on microsized suspensions, as well as a slight dependence of the electrorheological characteristics on temperature up to 80°C were noted. The results obtained open up prospects for wide practical application of this type of materials.