Impact of ionization equilibrium on electrokinetic flow of weak electrolytes in nanochannels.

Autor: Ji Z; School of Optical and Electronic Information, Huazhong University of Science and Technology, LuoYu Road, Wuhan 430074, People's Republic of China., Huang Z, Chen B, He Y, Tsutsui M, Miao X
Jazyk: angličtina
Zdroj: Nanotechnology [Nanotechnology] 2018 Jul 20; Vol. 29 (29), pp. 295402. Date of Electronic Publication: 2018 Apr 30.
DOI: 10.1088/1361-6528/aac126
Abstrakt: Weak electrolyte transport in nanochannels or nanopores has been actively explored in recent experiments. In this paper, we establish a new electrokinetic model where the ionization balance effect of weak electrolytes is outlined, and performed numerical calculations for H 3 PO 4 concentration-biased nanochannel systems. By considering the roles of local chemical equilibrium in phosphorous acid ionization, the simulation results show quantitative agreement with experimental observations. Based on the model, we predict that enhanced energy harvesting capacity could be accomplished by utilizing weak electrolytes compared to the conventional strong electrolyte approaches in a concentration gradient-based power-generating system.
Databáze: MEDLINE