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Thermal Scanning Conductometry (TSC) as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
Published on: January 23, 2018
Design and preparation of a novel temperature-responsive ionic gel. 2. Concentration modulation of specific ions in
Mitsuru Higa1, Tomoko Yamakawa
1Department of Applied Chemistry and Chemical Engineering, Yamaguchi University, Tokiwadai, 2-16-1, Ube City, Yamaguchi 755-8611, Japan. mhiga@yamaguchi-u.ac.jp
Abstract:
We have designed a novel temperature-responsive dialysis system consisting of mixed electrolyte solutions and an ionic gel whose charge density changes in response to temperature changes. The system can modulate the time-concentration profile of just bivalent ions in arbitrary forms by changing the transport modes of the ions in response to the temperature, as long as the system has a sufficient concentration difference of the driving electrolyte for the modulation. The simulation in a model system consisting of mixed KCl and CaCl(2) solutions and the ionic gel shows that the system modulates the time-concentration profile of Ca(2+) ions as a sawtooth waveform and also keeps the concentration a prearranged value for a certain time period by controlling the transport modes of just Ca(2+) ions in two ways: downhill (transport along their own concentration gradient in a system) and uphill (transport against their own concentration gradient), in response to temperature changes. The simulations agree quantitatively with the experiments using a temperature-responsive ionic gel prepared in the previous paper.
