Journal Article10.1103/PHYSREVLETT.74.2828
Field-Induced Structures in Ferrofluid Emulsions.
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TL;DR: The field-induced structure in a monodisperse ferrofluid emulsion is studied and results show that the column spacing follows a relation of 0ex 1.33L 0.37 L for cell thickness and a new theory, which treats the column shape more realistically, is developed.
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Abstract: The field-induced structure in a monodisperse ferrofluid emulsion is studied. An applied magnetic field induces a magnetic dipole moment in each droplet. When the dipole-dipole interaction energy exceeds the thermal energy, a phase transition occurs as the fluid of randomly dispersed droplets changes to a solid of nearly equally sized and spaced columns. Our results show that the column spacing follows a relation ${d\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.33L}^{0.37}$ for cell thickness $3\ensuremath{\le}L\ensuremath{\le}800\ensuremath{\mu}\mathrm{m}$. A new theory, which treats the column shape more realistically, is developed to account for the results.
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Rongjia Tao,J. M. Sun +1 more
TL;DR: The induced electrorheological solid has thick columns in the field direction ({ital z} axis), spreading between two electrodes, and can be regarded as a compound of chains of class {ital A} and {ital B}, where chains{ital B} are obtained from chains {ital a} by shifting a distance in the {ital z}.