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Transport of multicomponent, multivalent electrolyte solutions across nanocapillaries

Content Provider	Springer Nature Link
Author	Rangharajan, Kaushik K. Fuest, Marie Conlisk, A. T. Prakash, Shaurya
Copyright Year	2016
Abstract	Electrokinetic transport of aqueous solutions containing multiple ionic species in surface charge governed nanofluidic flows has seen limited investigation with most experimental and modeling efforts emphasizing symmetric, monovalent electrolytes. In this work, numerical models coupling steady-state Poisson–Nernst–Planck and Stokes equations along with experimental investigations were developed to characterize electrokinetic transport of potassium phosphate buffer, containing K+, H2PO4 −, and HPO4 2− across positively charged nanocapillary array membranes with 10 nm diameter nanocapillaries, sandwiched between a source and permeate reservoir. While systematically increasing phosphate buffer concentration from 0.2 to 10 mM, 0.14 mM of methylene blue (MB) dye was added to the source reservoir to study the dominating transport mechanism under a potential bias (0–0.75 V). Experiments provided validation of numerical results that elucidate fundamental transport mechanisms as a function of ion type, buffer concentration, and externally applied potential. The nanocapillary exhibits permselectivity toward anions at lower buffer concentrations (0.2, 1 mM) and was more selective for HPO4 2− in comparison with H2PO4 −. Transport of K+, H2PO4 −, and HPO4 2− was dominated by electromigration, with negligible effects of diffusion and convection at all buffer concentrations. However, transport of MB+ was dominated by diffusion at 0.2 mM buffer concentration under all potential bias conditions. Significant effects of electromigration appeared at high potential biases (0.5–0.75 V) for 1 and 10 mM bulk buffer concentrations. Additionally, in the multicomponent ion system, at all concentrations, the vast majority of the current was carried by the phosphate buffer ions and not the MB ions.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	20
Issue Number	4
e-ISSN	16134990
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-03-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanofluidics Electrokinetics Permselectivity Methylene blue Multivalent ions Ionic current Poisson–Nernst–Planck Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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