Influences of the size and dielectric properties of particles on electrorheological response

Tan, Zhi-Jie; Zou, Xian‐Wu; Zhang, Wenbing; Jin, Zhun‐Zhi

doi:10.1103/physreve.59.3177

Cited by 35 publications

(21 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This approximation is frequently used in computer simulations of MRS (see, for example, Refs. [10,11]). Analysis shows that this approximation does not lead to serious quantitative errors.…”

Section: Computer Simulationsmentioning

confidence: 99%

Kinetics of internal structures growth in magnetic suspensions

Bossis

Lançon

Meunier

et al. 2013

Physica A: Statistical Mechanics and its Applications

View full text Add to dashboard Cite

a b s t r a c tThe kinetics of aggregation of non Brownian magnetizable particles in the presence of a magnetic field is studied both theoretically and by means of computer simulations. A theoretical approach is based on a system of Smoluchowski equations for the distribution function of the number of particles in linear chain-like aggregates. Results obtained in the two dimensional (2D) and three dimensional (3D) models are analyzed in relation with the size of the cell, containing the particles, and the particle volume fraction ϕ. The theoretical model reproduces the change of the aggregation kinetics with the size of the cell and with the particle volume fraction as long as the lateral aggregation of chains is negligible.The simulations show that lateral aggregation takes place when, roughly, ϕ 2D > 5% and ϕ 3D > 1.5%.Dependence of the average size of the chains with time can be described by a power law; the corresponding exponent decreases with the particle volume fraction in relation with the lateral aggregation.In the 3D simulations, dense labyrinthine-like structures, aligned along the applied field, are observed when the particle concentration is high enough (ϕ 3D > 5%).

show abstract

Section: Computer Simulationsmentioning

confidence: 99%

Kinetics of internal structures growth in magnetic suspensions

Bossis

Lançon

Meunier

et al. 2013

Physica A: Statistical Mechanics and its Applications

View full text Add to dashboard Cite

show abstract

“…[15] Recent computer simulation results obtained using the moleculardynamics method show that the shear stress of an ER fluid should be proportional to the cube of the particle diameter. [16] When one kind of particle was mixed with another one, forming a bimodal suspension system, the shear stress was found to decrease both theoretically [16] and experimentally [17] with the volume fraction of smaller particles, reaching a minimum at a certain point that depended on the ratios of the particle sizes. These findings are consistent with the experimental results obtained in bimodal systems that are not ER active.…”

Section: The Dispersed Phasementioning

confidence: 99%

Electrorheological Fluids

2001

View full text Add to dashboard Cite

Materials that switch from liquid‐like to solid‐like upon application of an electric field are termed electrorheological fluids. The general features and preparation of these smart materials are reviewed before recent advances in the improvement and applications (e.g., sensors, damping devices, inks) of these fluids are described. Materials ranging from aluminosilicate (see Figure) and carbonaceous inorganic materials to liquid‐crystal polymers to semiconductive polymers can be used to fabricate electrorheological fluids.

show abstract

“…This makes the mechanical behavior readily controllable by using an external electric field [1][2][3][4][5][6][7]. Particle size has a quite diverse impact on the behavior of ERFs [8]. The nature of the insulating fluid and of the colloidal particles determines the electrorheological behavior of the suspensions.…”

mentioning

confidence: 99%

Intercalation-enhanced electric polarization and chain formation of nano-layered particles

et al. 2006

View full text Add to dashboard Cite

ray scattering (including small-angle scattering). PACS. 82.70.Dd -Colloids. PACS. 83.80.Gv -Electro-and magnetorheological fluids.Abstract. -Microscopy observations show that suspensions of synthetic and natural nanolayered smectite clay particles submitted to a strong external electric field undergo a fast and extended structuring. This structuring results from the interaction between induced electric dipoles, and is only possible for particles with suitable polarization properties. Smectite clay colloids are observed to be particularly suitable, in contrast to similar suspensions of a nonswelling clay. Synchrotron X-ray scattering experiments provide the orientation distributions for the particles. These distributions are understood in terms of competing (i) homogenizing entropy and (ii) interaction between the particles and the local electric field; they show that clay particles polarize along their silica sheet. Furthermore, a change in the platelet separation inside nano-layered particles occurs under application of the electric field, indicating that intercalated ions and water molecules play a role in their electric polarization. The resulting induced dipole is structurally attached to the particle, and this causes particles to reorient and interact, resulting in the observed macroscopic structuring. The macroscopic properties of these electrorheological smectite suspensions may be tuned by controlling the nature and quantity of the intercalated species, at the nanoscale.In this letter we study colloidal suspensions of electrically-polarizable particles in nonconducting fluids. When such suspensions are subjected to an external electric field, usually of the order of 1kV/mm, the particles become polarized, and subsequent dipolar interactions are responsible for aggregating a series of interlinked particles that form chains and columns parallel to the applied field. This structuring occurs within seconds, and disappears almost instantly when the field is removed [1][2][3][4][5]. It coincides with a drastic change in rheological properties (viscosity, yield stress, shear modulus, etc.) of the suspensions [6], which is why they are sometimes called electrorheological fluids (ERFs). This makes the mechanical behavior readily controllable by using an external electric field [1][2][3][4][5][6][7]. Particle size has a quite diverse impact on the behavior of ERFs [8]. The nature of the insulating fluid and of the colloidal particles determines the electrorheological behavior of the suspensions. The mechanism is not fully understood yet, but it is mainly triggered by the so-called interfacial polarization, EDP Sciences

show abstract

Influences of the size and dielectric properties of particles on electrorheological response

Cited by 35 publications

References 23 publications

Kinetics of internal structures growth in magnetic suspensions

Kinetics of internal structures growth in magnetic suspensions

Electrorheological Fluids

Intercalation-enhanced electric polarization and chain formation of nano-layered particles

Contact Info

Product

Resources

About