LPS, UMR CNRS 8550, Ecole Normale Supérieure, PSL Research University, 24 Rue Lhomond, 75005 Paris, France.
J Chem Phys. 2017 May 21;146(19):194701. doi: 10.1063/1.4982221.
In this paper, we explore various forms of osmotic transport in the regime of high solute concentration. We consider both the osmosis across membranes and diffusio-osmosis at solid interfaces, driven by solute concentration gradients. We follow a mechanical point of view of osmotic transport, which allows us to gain much insight into the local mechanical balance underlying osmosis. We demonstrate in particular how the general expression of the osmotic pressure for mixtures, as obtained classically from the thermodynamic framework, emerges from the mechanical balance controlling non-equilibrium transport under solute gradients. Expressions for the rejection coefficient of osmosis and the diffusio-osmotic mobilities are accordingly obtained. These results generalize existing ones in the dilute solute regime to mixtures with arbitrary concentrations.
在本文中，我们探索了高浓度溶质条件下的各种形式的渗透传输。我们考虑了跨膜渗透以及由溶质浓度梯度驱动的固-液界面的扩散渗透。我们从渗透传输的力学角度出发，这使我们能够深入了解渗透过程中的局部力学平衡。我们特别证明了如何从热力学框架经典地获得混合物渗透压的一般表达式，以及该表达式如何从控制溶质梯度下非平衡传输的力学平衡中得出。因此，我们得到了渗透的截留系数和扩散渗透迁移率的表达式。这些结果将现有的稀溶质条件下的结果推广到任意浓度的混合物中。
