Magnetically reconfigurable colloidal patterns arranged from arrays of self-assembled microscopic dimers
Magnetically reconfigurable colloidal patterns arranged from arrays of self-assembled microscopic dimers
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由自组装微观二聚体阵列排列而成的磁性可重构胶体图案
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Tierno
中科院分区：
文献类型：
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作者：
P. Tierno
本文提出了一种自下而上的策略，将微尺度的顺磁粒子组装成胶体二聚体，置于结构磁性衬底之上。外磁场的应用改变了衬底的杂散场，并产生了一些复杂的结构，如人字形图案，树状，分支或扣链，这是由于磁偶极相互作用和衬底钉钉之间的竞争造成的。最后，利用所实现的胶体图案来控制和切换漂浮在组装的顺磁性二聚体之上的非磁性胶体的迁移率。
This article presents a bottom-up strategy to assemble microscale paramagnetic particles into colloidal dimers above a structured magnetic substrate. Application of an external magnetic field modifies the stray field of the substrate, and generates several complex structures such as herringbone patterns, trees, branched or buckled chains, resulting from the competition between magnetic dipolar interactions and pinning of the substrate. Finally, the realized colloidal patterns are used to control and switch the mobility of non-magnetic colloids floating above the assembled paramagnetic dimers.