Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia.
Phys Rev Lett. 2009 Nov 27;103(22):228301. doi: 10.1103/PhysRevLett.103.228301. Epub 2009 Nov 24.
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.
我们报告了一些实验，这些实验探究了微米大小胶体自组装成单粒子厚、坚固且自修复的膜。在魔角进动磁场中，超顺磁球经历各向同性的对吸引，类似于原子之间的范德华力。但是它们之间的多体极化相互作用引导了一个有序的聚集途径，包括短链的生长、交联和网络形成、网络粗化以及膜片的固结。这种通用的聚集场景可以在任何具有足够大磁化率的粒子中诱导产生。
