Field-Induced Self-Assembly of Suspended Colloidal Membranes
Field-Induced Self-Assembly of Suspended Colloidal Membranes
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DOI：
10.1103/physrevlett.103.228301
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发表时间：
2009-11-27
影响因子：
8.6
通讯作者：
Babic, D.
中科院分区：
文献类型：
--
作者：
Osterman, N.;Poberaj, I.;Babic, D.
我们报告了探索微米级胶体自组装成单颗粒厚度、坚固且自修复膜的实验。在魔角进动磁场中，超顺磁性球体经历各向同性对吸引力，类似于原子之间的范德华力。但它们之间的多体极化相互作用引导了一条有序的聚集途径，包括短链的生长、交联和网络的形成、网络的粗化和膜片的固结。这种通用的聚集情况可以在任何具有足够大磁化率的颗粒中引起。
We report experiments that probe the self-assembly of micrometer-size colloids into one-particle-thick, robust, and self-healing membranes. In a magic-angle precessing magnetic field, superparamagnetic spheres experience isotropic pair attraction similar to the van der Waals force between atoms. But the many-body polarization interactions among them steer an ordered aggregation pathway consisting of growth of short chains, cross-linking and network formation, network coarsening, and consolidation of membrane patches. This generic aggregation scenario can be induced in any particles of large enough susceptibility.