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Chemomechanical Motion of a Self‐Oscillating Gel in a Protic Ionic Liquid
Author(s) -
Masuda Tsukuru,
Ueki Takeshi,
Tamate Ryota,
Matsukawa Ko,
Yoshida Ryo
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201809413
Subject(s) - methacrylamide , belousov–zhabotinsky reaction , chemistry , copolymer , polymer , proton , malonic acid , ternary operation , polymer chemistry , oscillation (cell signaling) , moiety , ionic liquid , swelling , ionic bonding , redox , ionic strength , catalysis , aqueous solution , materials science , inorganic chemistry , organic chemistry , ion , biochemistry , acrylamide , physics , quantum mechanics , computer science , programming language , composite material
Abstract An autonomous swelling–deswelling oscillation of polymer gels in a hydrated protic ionic liquid (PIL) as a proton source for the Belousov–Zhabotinsky (BZ) reaction is presented. Methylammonium hydrogen sulfate ([maH + ][HSO 4 − ]) was employed as the PIL because it provides stable redox oscillation in the BZ reaction. Due to the significantly higher p K a for [maH + ][HSO 4 − ] than those for conventional proton sources for the BZ reaction, chemomechanical oscillation can be expected under weaker acidic conditions. The self‐oscillating polymer was designed as a ternary random copolymer of N ‐isopropylacrylamide, N ‐(3‐aminopropyl)methacrylamide, and the Ru(bpy) 3 moiety as a catalyst for the BZ reaction. The copolymer exhibited spontaneous soluble–insoluble oscillation in hydrated [maH + ][HSO 4 − ] containing NaBrO 3 and malonic acid. Macroscopic swelling–deswelling oscillation of the porous bulk gel prepared by covalently connecting microgel particles was also observed.