Begell House Inc.
Nanoscience and Technology: An International Journal
NST
2572-4258
1
3
2010
THE ROLE OF THE SCALE FACTOR IN ESTIMATION OF THE MECHANICAL PROPERTIES OF COMPOSITE MATERIALS WITH NANOFILLERS
187-210
10.1615/NanomechanicsSciTechnolIntJ.v1.i3.10
Yuri G.
Yanovsky
Institute of Applied Mechanics, Russian Academy of Sciences, 7 Leningradsky
Ave., Moscow, 125040, Russia
H. H.
Valiev
Institute of Applied Mechanics, Russian Academy of Sciences, 7 Leningradskii Ave., Moscow,
125040, Russia
Yu. V.
Kornev
Institute of Applied Mechanics, Russian Academy of Sciences, 7 Leningradsky Ave., Moscow, 125040, Russia
Yulia N.
Karnet
Institute of Applied Mechanics, Russian Academy of Sciences,7 Leningradsky Ave., Moscow, 125040, Russia
O. V.
Boiko
Institute of Applied Mechanics, Russian Academy of Sciences, Moscow, Russia
K. P.
Kosichkina
Institute of Applied Mechanics, Russian Academy of Sciences, Moscow, Russia
O. B.
Yumashev
Institute of Applied Mechanics, Russian Academy of Sciences, Moscow, Russia
scale factor
nanocomposites
nanoparticles
AFM
nanoindentation
structure of composites
strength
Using the methods of probe microscopy and nanoindentation, the physicomechanical properties of elastomer composites, which include nanodimensional particles of various kinds of fillers, have been investigated by strength macrotests. In the mode of the surface topography, phase contrast, and force modulation the nanostructure of filled composites and the distribution of the aggregates of filler particles in a matrix have been studied, and for the first time in the course of direct experiments estimation of the structural and mechanical parameters of the interphase layers of such kind of objects has been made. A comparison with the properties of microfilled elastomer composites was carried out. The evaluation of the scale factor in deformation in connection with the recorded strength parameters of the medium has been performed.
MODELLING OF THE FORMATION OF INTERPHASE LAYERS IN NANOFILLED ELASTOMERS
211-222
10.1615/NanomechanicsSciTechnolIntJ.v1.i3.20
Lyudmila A.
Komar
Institute of Continuous Media Mechanics, Urals Branch of the Russian Academy of Sciences, Perm, 614013, Russia; and Leibniz-Institut fur Polymerforschung Dresden e.V., 01069 Dresden, Germany
Bernd
Lauke
Leibniz-Institut für Polymerforschung Dresden e.V., 01069 Dresden, Germany
G.
Heinrich
Leibniz-Institut für Polymerforschung Dresden e.V., 01069 Dresden, Germany
nanocomposite
interphase layer
modeling
properties
In this paper, we present the results of modeling the formation of interphase layers (a few nm thick) with specific properties, which arise around filler nanoparticles in elastomeric nanocomposites. We use a continuum model based on the hypothesis explaining the reasons for the formation of interphase layers. This hypothesis stems from the fact that polymer chains near the surface of filler particles have the ability to change the orientation of neighboring chains, forcing them to take such an orientation in which they themselves have to be. The proposed continuum model is applied to a two-dimensional problem for description of the formation of interphase layers in the vicinity of filler particles and in the gap between them.
TRANSVERSE ELASTIC MODULUS IN UNIDIRECTIONAL FIBER REINFORCED COMPOSITES: MODELING WITH VARYING INTERPHASE USING NUMERICAL INTEGRATION
223-245
10.1615/NanomechanicsSciTechnolIntJ.v1.i3.30
A. A.
Shaikh
Mechanical Engineering Department, Sardar Vallabhbhai National Institute of Technology, College Campus, Ichchhanath, Surat-395007(Gujarat-India)
PIYUSH
GOHIL
Faculty of Technology & Engineering, M S University of Baroda
adhesion
interphase
transverse elastic modulus
numerical integration
unidirectional composites
The loading of composite in the perpendicular direction to that of the principal axis of fiber is a case of transverse loading where the adhesion between fiber-matrix plays a crucial role. A most influential parameter for composite behavior in this case is the contemplation of interphase of the two main phases. The present work contains mathematical modeling for the interphase elastic modulus using various numerical integration techniques, e.g., trapezoidal, Simpson's 1/3, Simpson's 3/8, and Romberg's integration. The transverse elastic modulus model for unidirectional fiber reinforced composites is proposed with due consideration of adhesion phenomenon and interphase. Based on these techniques a simulation program is developed. The developed model for the transverse elastic modulus is also validated with available experimental data and the power-law variation model is found to be in good agreement with experimental results. Thus, the developed model is very helpful in considering the interphase effect as it is always advisable to take care of interphase in the design steps because the characterization of interphase is very difficult, time-consuming, and costlier procedure.
A MOLECULAR DYNAMIC SIMULATION OF THE BEHAVIOR OF WATER MOLECULES INSIDE A CARBON NANOTUBE
247-255
10.1615/NanomechanicsSciTechnolIntJ.v1.i3.40
Amir Reza Ansari
Dezfoli
Department of Mechanical Engineering, Shahid Bahonar University of Kerman, P. O. Box 76175-133, Kerman, Iran
Zahra
Adabavazeh
Department of Materials Engineering, Isfahan University of Technology, Iran
Sasan
Mehrabian
Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Iran
molecular dynamic simulation
carbon nanotube
water molecules
SPC/E model
This study utilizes molecular dynamics simulation to investigate the behavior of water molecules inside carbon nanotubes of various sizes. In this work, water alignment in four types of CNTs — CNT44, CNT55, CNT66, and CNT77 — are studied. The simulations predict the formation of a strongly connected one-dimensional hydrogen-bonded water wire resulting in a net electric dipole moment directed along the nanotube axis where this water wire formation is found to be more pronounced in nanotubes of smaller diameter than in larger nanotubes.
HEAT CONDUCTION IN A NANOFLUID LAYER CONSIDERING THE PARTICLE MIGRATION DUE TO BROWNIAN DIFFUSION AND THERMOPHORESIS
257-272
10.1615/NanomechanicsSciTechnolIntJ.v1.i3.50
Farshad
Kowsary
Department of Mechanical Engineering, University College of Engineering, University of Tehran, Tehran 515-14395, Iran
Mohammad Mahdi
Heyhat
School of Mechanical Engineering, University College of Engineering, University of Tehran, Tehran, Iran
nanofluids
particle migration
thermophoresis
Brownian
motion
heat conduction
The aim of the present paper is to study heat conduction in a nanofluid layer containing low volume concentration of Al2O3 nanoparticles with regard to the migration of nanoparticles due to Brownian diffusion and thermophoresis. To do this, both known heat flux and known temperature boundary conditions are investigated. All of the properties are assumed to be temperature- as well as particle concentration-dependent. The energy equation along with the particle concentration equation is nondimensionalized and solved numerically. The effects of temperature difference and heat flux magnitude on nonuniform distribution of nanoparticles, the local conductivity, and temperature distribution of nanofluid are shown.