标题： 基于表面化学的通过扩散渗析和扩散渗透实现胶体粒子的连续分离 显示英文标题

标题： Surface Chemistry-based Continuous Separation of Colloidal Particles via Diffusiophoresis and Diffusioosmosis

摘要： 仅基于表面特性分离胶体颗粒是一项极具挑战性的任务。 本研究证明，扩散泳动和扩散渗透效应能够实现对具有相似尺寸和Zeta电位但羧基表面浓度不同的羧酸盐聚苯乙烯颗粒的连续分离。 这些颗粒暴露于双接点微流控装置中产生的盐浓度梯度中。 通过实验和理论分析，我们展示了粒子动力学如何受到其Zeta电位对局部盐浓度敏感性的影响，而这种敏感性又受到由表面羧基引起的表面电导效应的影响。 因此，具有相近Zeta电位但羧基表面浓度不同的胶体可以以100%的效率进行分离。 这种方法采用了一种简单且易于操作的设备，具有跨学科的潜力，可用于连续分离仅通过影响其Zeta电位敏感性的表面特性（如粗糙度、渗透性、异质性和化学组成）来区分的胶体。 显示英文摘要

摘要： The separation of colloidal particles based solely on their surface properties is a highly challenging task. This study demonstrates that diffusiophoresis and diffusioosmosis enable the continuous separation of carboxylate polystyrene particles with similar sizes and zeta potentials but distinct surface concentrations of carboxyl groups. The particles are exposed to salt concentration gradients generated in a double-junction microfluidic device. Through experimental and theoretical analyses, we demonstrate how the particle dynamics are influenced by their zeta potential sensitivity to the local salt concentration, which in turn is affected by surface conductance effects induced by the surface carboxyl groups. Consequently, colloids with comparable zeta potentials but differing surface concentrations of carboxyl groups can be separated with 100% efficiency. This approach, which employs a simple, easy-to-operate device, has discipline-spanning potential for the continuous separation of colloids distinguished solely by surface properties that influence their zeta potential sensitivities, like roughness, permeability, heterogeneity, and chemical composition.