Barragán V María, Villaluenga Juan P G, Morales-Villarejo Víctor, Izquierdo-Gil M Amparo
Department of Structure of Matter, Thermal Physics and Electronics, Complutense University of Madrid, 28040 Madrid, Spain.
Entropy (Basel). 2020 Jun 20;22(6):692. doi: 10.3390/e22060692.
The aim of this work is to apply linear non-equilibrium thermodynamics to study the electrokinetic properties of three cation-exchange membranes of different structures in ethanol-water electrolyte solutions. To this end, liquid uptake and electro-osmotic permeability were estimated with potassium chloride ethanol-water solutions with different ethanol proportions as solvent. Current-voltage curves were also measured for each membrane system to estimate the energy dissipation due to the Joule effect. Considering the Onsager reciprocity relations, the streaming potential coefficient was discussed in terms of ethanol content of the solutions and the membrane structure. The results showed that more porous heterogeneous membrane presented lower values of liquid uptake and streaming potential coefficient with increasing ethanol content. Denser homogeneous membrane showed higher values for both, solvent uptake and streaming coefficient for intermediate content of ethanol.
这项工作的目的是应用线性非平衡热力学来研究三种不同结构的阳离子交换膜在乙醇 - 水电解质溶液中的电动性质。为此，以不同乙醇比例的氯化钾乙醇 - 水溶液作为溶剂，估算了液体吸收和电渗渗透率。还测量了每个膜系统的电流 - 电压曲线，以估算由于焦耳效应引起的能量耗散。考虑到昂萨格互易关系，根据溶液的乙醇含量和膜结构讨论了流动电位系数。结果表明，随着乙醇含量的增加，多孔性更强的非均质膜的液体吸收值和流动电位系数较低。对于乙醇含量处于中间值的情况，致密的均质膜的溶剂吸收值和流动系数较高。
