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Electrochemical Cloud Point Temperature from Thermoamperometry: Real-Time Analysis for Phase Transition of Thermoresponsive Polymers

Authors
Ji Young LeeTaehyoung KimSua SongJeeho LeeSang Youl KimJinhee LeeByung-Kwon Kim
Issue Date
7-Feb-2023
Publisher
American Chemical Society
Citation
Analytical Chemistry, v.95, no.5, pp 2832 - 2837
Pages
6
Journal Title
Analytical Chemistry
Volume
95
Number
5
Start Page
2832
End Page
2837
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/152024
DOI
10.1021/acs.analchem.2c04254
ISSN
0003-2700
1520-6882
Abstract
Cloud point temperature (Tcp) is a thermal index used to define the phase transition of thermoresponsive polymers. In this study, we used electrochemical techniques to obtain an electrochemical cloud point temperature (Tecp) that exhibits the more accurate phase transition temperature and can replace Tcp. Thermoamperometry on an ultramicroelectrode was conducted with a poly(arylene ether sulfone) (PES10) as a model system to obtain a current-temperature (i-T) curve in real time; the Tecp of the PES10 was determined from the i-T curve. The i-T curve shows an unprecedented current decrease in the PES10 solution despite increasing temperature; on the other hand, the current increased linearly with increasing temperature in the solution without PES10. This phenomenon was analyzed by considering the characteristics of PES10 during phase transition, such as dynamic viscosity, temperature of the solution, and electrode impedance. It was confirmed that the current drops shown in the i-T curves were mainly due to the decrease of real electrode area. The comparison of Tecp and Tcp showed that both depended similarly on the concentrations of the thermoresponsive polymer and the supporting electrolyte. The results reveal that by adjusting the concentration of polymer and electrolyte in an organic solution, Tecp, as a new analytical method, can be used in electric circuit-based energy storage appliances such as Li-ion batteries and supercapacitors. © 2023 American Chemical Society.
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