期刊
JOURNAL OF CHEMICAL PHYSICS
卷 136, 期 16, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4705393
关键词
Brownian motion; colloidal crystals; crystal microstructure; crystallisation; optical microscopy; polymer electrolytes; resins; thermal stability
资金
- Deutsche Forschungsgemeinschaft [SFB-TR6, Pa459/15-17, Scho1054/3]
We investigated driven crystal formation events in thin layers of sedimented colloidal particles under low salt conditions. Using optical microscopy, we observe particles in a thermodynamically stable colloidal fluid to move radially converging towards cation exchange resin fragments acting as seed particles. When the local particle concentration has become sufficiently large, subsequently crystallization occurs. Brownian dynamics simulations of a 2D system of purely repulsive point-like particles exposed to an attractive potential, yield strikingly similar scenarios, and kinetics of accumulation and micro-structure formation. This offers the possibility of flexibly designing and manufacturing thin colloidal crystals at controlled positions and thus to obtain specific micro-structures not accessible by conventional approaches. We further demonstrate that particle motion is correlated with the existence of a gradient in electrolyte concentration due to the release of electrolyte by the seeds. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4705393]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据