期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 553, 期 -, 页码 639-646出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.06.061
关键词
Charged conical nanopore; Current-voltage curve; Current rectification; Asymmetric electrolytes; Charge number effects; Membrane potential
资金
- Ministerio de Ciencia, Innovacion y Universidades (Spain)
- European Regional Development Funds (FEDER) [PGC2018-097359-B-100]
- Hessen State Ministry of Higher Education, Research and the Arts, Germany, under the LOEWE project iNAPO
We stud y experimentally the current (I)-voltage (V) curves of 1:1, 2:1, 3:1, 2:2, 1:2, and 1:3 electrolytes in positively and negatively charged conically-shaped pores of nanoscale dimensions. The positive charges are poly(allylamine hydrochloride) chains functionalized on the pore surface by electrostatic interactions while the negative charges are carboxylic acid groups. Under physiological conditions, these fixed-charge groups are ionized and strongly interact with the different monovalent, divalent, and trivalent ions in the pore solution. The current rectification of the I-V curves and the membrane potentials provide fundamental information on the interaction of the pore charge groups with the mobile ions present at electrochemically and biologically relevant concentrations. The different pores and electrolytes studied, together with the abundant experimental data provided, can be useful to develop new theoretical simulations of transport phenomena in nanoscale solutions that are confined within charged surfaces. (C) 2019 Elsevier Inc. All rights reserved.
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