Reversible light-induced cluster formation of magnetic colloids

被引：47

作者：

Hoffmann, B ^{[1
]}

Köhler, W ^{[1
]}

机构：

[1] Univ Bayreuth, Inst Phys, D-95440 Bayreuth, Germany

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 262卷 / 02期

关键词：

ferrofluid; aggregation; optical properties;

D O I：

10.1016/S0304-8853(02)01501-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the new observation of fully reversible light-induced cluster formation in sterically stabilized kerosene-based magnetite (Fe3O4) ferrofluids. When illuminated with visible light within their optical absorption band, mum-sized clusters are formed which contain of the order of 10(7) individual colloidal particles. After switching the illumination off, the attractive forces disappear and the clusters dissolve on a time scale of 1 min. Linear chains of several 100 mum length are formed upon illumination in the presense of a weak magnetic field (1 mT). This new effect may be useful for patterning and optically triggered reversible assembly of controlled nano- and micro structures. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：289 / 293

页数：5

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