Dhont J K G, Kang K
Forschungszentrum Jülich, Institute für Festkörper Forschung (IFF), Weiche Materie, D-52425 Jülich, Germany.
Eur Phys J E Soft Matter. 2010 Sep;33(1):51-68. doi: 10.1140/epje/i2010-10656-5. Epub 2010 Oct 6.
The electric-field-induced charge distribution and potential around a colloidal sphere and rod in salt solutions are analyzed. The resulting field-induced colloid-colloid interactions are calculated for specific orientations. The colloids are assumed to be uncharged (or very weakly charged), such that the deflection of ion fluxes by the cores of the colloids is the dominant polarization mechanism (which is referred to as volume-polarization). Explicit expressions are derived for the frequency-dependent charge distribution and the potential in case of a symmetric electrolyte. It is shown that colloid-colloid interactions due to the induced charge distributions can be much larger than the thermal energy, and are therefore sufficiently strong to give rise to electric-field-induced phase transitions. The present study is a first step towards a quantitative description of field-induced transitions for systems where volume-polarization is the dominant polarization mechanism.
分析了盐溶液中胶体球和棒周围的电场诱导电荷分布和电势。针对特定取向计算了由此产生的场诱导胶体-胶体相互作用。假设胶体不带电（或带非常弱的电荷），使得胶体核心对离子通量的偏转是主要的极化机制（称为体积极化）。推导了对称电解质情况下频率相关电荷分布和电势的显式表达式。结果表明，由于诱导电荷分布引起的胶体-胶体相互作用可能比热能大得多，因此足够强，能够引发电场诱导的相变。本研究是朝着定量描述以体积极化作为主要极化机制的系统的场诱导转变迈出的第一步。
