Magnetically tunable self-assembly of colloidal rings

被引：44

作者：

Li, Kwan H. ^{[1
]}

Yellen, Benjamin B. ^{[1
]}

机构：

[1] Duke Univ, Dept Mech Engn & Mat Sci, Ctr Biologically Inspired Mat & Mat Syst, Durham, NC 27708 USA

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 08期

基金：

美国国家科学基金会;

关键词：

diamagnetic materials; magnetic fluids; magnetic moments; magnetic particles; nanofabrication; nanomagnetics; nanoparticles; self-assembly; superparamagnetism; suspensions; MAGNETOPHORESIS;

D O I：

10.1063/1.3483137

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a technique using ferrofluid to induce bidisperse suspensions of superparamagnetic and diamagnetic beads to assemble into colloidal ring configurations. The separation distance between particles within the ring can be tuned by adjusting the ferrofluid concentration, which has the effect of enhancing the effective dipole moment of one of the components while screening the dipole moment of the other, leading to a wealth of different ring configurations. (C) 2010 American Institute of Physics. [doi:10.1063/1.3483137]

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