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Behaviour of Anionic and Cationic Hydrogels
Author(s) -
Keller Karsten,
Wallmersperger Thomas,
Ricken Tim
Publication year - 2018
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201800472
Subject(s) - self healing hydrogels , swelling , cationic polymerization , actuator , aqueous solution , ionic bonding , materials science , electric field , electric potential energy , solvent , electrolyte , smart material , chemical engineering , ion , nanotechnology , composite material , chemistry , polymer chemistry , thermodynamics , electrode , electrical engineering , organic chemistry , physics , power (physics) , quantum mechanics , engineering
Ionic polyelectrolytic gels in an aqueous solution, i.e. hydrogels – also known as smart materials – react to different kinds of environmental changes, e.g. chemical, electrical, mechanical, and thermal stimulation. As a reaction, they show enormous swelling capabilities resulting from the delivery or uptake of ions and solvent. These properties make them attractive for chemo‐electro‐mechanical energy converters and for the application as actuators or sensors. The applied multi‐field formulation consists of the chemical, electrical, and mechanical field and is capable of giving local concentrations, electric potential distributions and displacements. In this excerpt the reaction of a modelled hydrogel finger gripper under electrical stimulation is shown. The swelling ratio is assumed to be in the regime of small volume changes and corresponding displacements.