Electrochemical Probing of Steric, Electrostatic and Hydrophobic Interactions of Large Cations in Polymers of Intrinsic Microporosity

Author:

Frey Taylor L.,Fruehauf Krista R.,Lucas Rachel A.,Polster Jake W.ORCID,Shea Kenneth J.ORCID,Siwy Zuzanna S.ORCID

Abstract

Porous membranes have been used for many applications, including separations in biotechnology, the food industry, water purification, and even energy storage devices. The benefit of polymers of intrinsic microporosity (PIMs) is their consistently sized nanopore channels. Inherent functionalities of the PIM structure not only create these channels but are also available for further modifications that can change the interactions of ions and molecules inside of the pore. Here we design solid state nanopores on which are drop-casted two different PIMs, functionalized with either a cyano group or a carboxylic acid. Ionic transport through the membranes is investigated based on pore size and charge-charge interactions, as well as steric and hydrophobic interactions. Achieving specific ion selectivity with easily processable porous membranes opens new avenues for water purification strategies and energy storage.

Funder

U.S. Department of Energy, Office of Science, Basic Energy Sciences

Publisher

The Electrochemical Society

Subject

Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials

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