軟質コロイド懸濁電解質の構造、レオロジー、および電気運動学

Structure, Rheology, and Electrokinetics of Soft Colloidal Suspension Electrolytes.

• Snehashis Choudhury
• Gaojin Li
• Rohit Singh
• Alexander Warren
• Xiaotun Liu
• Lynden A Archer

抄録

二液性電解質中のイオン輸送が熱電圧以上の電位で駆動されると、電解質/電極界面に空間電荷領域が形成され、電気伝導と呼ばれる流体力学的不安定性が引き起こされる。この不安定性が、液体ホスト中に低濃度の高分子ナノ粒子を含むソフトコロイド懸濁液電解質で完全に停止することを実験的に示した。このメカニズムは、X線散乱,ブラウン力学計算,線形安定性解析により明らかになった。

When ion transport in a binary liquid electrolyte is driven at potentials above the thermal voltage, an extended space charge region forms at the electrolyte/electrode interface and triggers the hydrodynamic instability termed electroconvection. We experimentally show that this instability can be completely arrested in soft colloidal suspension electrolytes comprised of low concentrations of polymer-grafted nanoparticles in a liquid host. The mechanism is revealed by means of x-ray scattering, Brownian dynamics calculations, and linear stability analysis to involve overlap of the soft particles at low particle fractions to create a jammed, nanoporous medium that resists convective flow by a Darcy-Brinkman like drag on the electrolyte solvent.