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RESEARCH PRODUCT

Ionic transport characteristics of negatively and positively charged conical nanopores in 1:1, 2:1, 3:1, 2:2, 1:2, and 1:3 electrolytes

Mubarak AliSalvador MafeVicente GomezWolfgang EnsingerJavier CerveraSaima NasirPatricio RamirezM. Hamza Ali Haider

subject

chemistry.chemical_classificationCarboxylic acidIonic bonding02 engineering and technologyElectrolyte010402 general chemistry021001 nanoscience & nanotechnologyElectrostatics01 natural sciences0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsDivalentIonBiomaterialsNanoporeColloid and Surface ChemistrychemistryChemical physics0210 nano-technologyTransport phenomena

description

We study 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.

yearjournalcountryeditionlanguage
2019-10-01Journal of Colloid and Interface Science
https://doi.org/10.1016/j.jcis.2019.06.061