Phase separation of 2D meso-scale Coulombic crystals from meso-scale polarizable "solvent"
Phase separation of 2D meso-scale Coulombic crystals from meso-scale polarizable "solvent"
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DOI：
10.1039/b813590h
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发表时间：
2009-01-01
期刊：
影响因子：
3.4
通讯作者：
Whitesides, George M.
中科院分区：
文献类型：
--
作者：
Kaufman, George K.;Thomas, Samuel W., III;Whitesides, George M.
本文介绍了基于静电荷的毫米级微球的相分离。首先，将聚合物（Teflon，T; Nylon-6，6，N）和金属（金涂覆的Nylon-6，6，Au-N）球在金涂覆的板上均匀混合成二维（2D）单层。垂直振动板导致球体通过接触带电（摩擦充电）充电。带正电荷的N球和带负电荷的T球相互吸引比它们吸引电容性带电的Au-N球更强烈。T球和N球形成二维库仑晶体，这些晶体与Au-N球分离。分离的程度和速率随着在摩擦充电期间搅拌的幅度的增加而增加，并且随着表面上的球体的密度的降低而增加。在高表面密度下，T球和N球不与Au-N球分离。该系统模拟了离子晶体从可极化液体中的二维成核。
This paper describes the phase separation of millimetre-scale spheres based on electrostatic charge. Initially, polymeric (Teflon, T; Nylon-6,6, N) and metallic (gold-coated Nylon-6,6, Au-N) spheres are uniformly mixed in a two-dimensional (2D) monolayer on a gold-coated plate. Oscillating the plate vertically caused the spheres to charge by contact electrification (tribocharging). Positively charged N and negatively charged T spheres attracted each other more strongly than they attracted the capacitively charged, Au-N spheres. The T and N spheres formed 2D Coulombic crystals, and these crystals separated from the Au-N spheres. The extent and rate of separation increased with increasing amplitude of agitation during tribocharging, and with decreasing density of spheres on the surface. At high surface density, the T and N spheres did not separate from the Au-N spheres. This system models the 2D nucleation of an ionic crystal from a polarizable liquid.