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arXiv 0904.2810cond-mat.soft
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旋转交流电场中二维可调谐胶体晶体的简单模型

Simple models for two-dimensional tunable colloidal crystals in rotating ac electric fields

Nils Elsner, C. Patrick Royall, Brian Vincent, David RE Snoswell

摘要:

我们比较了一个新的二维水胶体模型系统的行为与一个简单的数值处理。对于一阶,由面内旋转交流电场引起的胶体之间的吸引相互作用是偶极的,而电荷稳定导致较短范围的Yukawa类排斥。在足够的场强形成的晶体状的“筏”,我们发现实验和蒙特卡罗模拟之间的定量协议,除了在强相互作用系统的情况下,其中有效势的井深超过250倍的热能。晶体状筏的“晶格常数”近似位于有效势的最小值处,由Yukawa和偶极相互作用的总和产生。由于可以用外部电场调节晶格间距,该实验系统具有显示应用。在所施加的电场强度和粒子的静电相互作用的相对范围的限制导致在可调晶格间距的减少,分别为小颗粒和大颗粒。发现使晶格间距可调性最大化的最佳颗粒尺寸为约1000 nm。

英文摘要:

We compare the behavior of a new two-dimensional aqueous colloidal model system with a simple numerical treatment. To the first order the attractive interaction between the colloids induced by an in-plane rotating ac electric field is dipolar, while the charge stabilization leads to a shorter ranged, Yukawa-like repulsion. In the crystal-like 'rafts' formed at sufficient field strengths, we find quantitative agreement between experiment and Monte Carlo simulation, except in the case of strongly interacting systems, where the well depth of the effective potential exceeds 250 times the thermal energy. The 'lattice constant' of the crystal-like raft is located approximately at the minimum of the effective potential, resulting from the sum of the Yukawa and dipolar interactions.The experimental system has display applications, owing to the possibility of tuning the lattice spacing with the external electric field. Limitations in the applied field strength and relative range of the electrostatic interactions of the particles result in a reduction in tunable lattice spacing for small and large particles, respectively. The optimal particle size for maximizing the lattice spacing tunability was found to be around 1000 nm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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