title: Large deformation of self-oscillating polymer gel.
abstract: A self-oscillating gel is a system that generates an autonomous volume oscillation. This oscillation is powered by the chemical energy of the Belousov-Zhabotinsky (BZ) reaction, which demonstrates metal ion redox oscillation. A self-oscillating gel is composed of Poly-N-isopropylacrylamide (PNIPAAm) with a metal ion. In this study, we found that the displacement of the volume oscillation in a self-oscillating gel could be controlled by its being subjected to a prestraining process. We also revealed the driving mechanism of the self-oscillating gel from the point of view of thermodynamics. We observed that the polymer-solvent interaction parameter χ is altered by the redox changes to the metal ion incorporated in the self-oscillating gel. The prestraining process leads to changes in χ and changes in enthalpy and entropy when the self-oscillating gel is in a reduced and oxidized state. We found that nonprestrained gel samples oscillate in a poor solution (χ>0.5) and prestrained gel samples oscillate in a good solution (χ<0.5).
authors: Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Toyosu, Tokyo 135-8548, Japan.
authors: Shingo
authors: S
authors: Maeda
authors: Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Toyosu, Tokyo 135-8548, Japan.
authors: Terukazu
authors: T
authors: Kato
authors: Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Toyosu, Tokyo 135-8548, Japan.
authors: Yuji
authors: Y
authors: Otsuka
authors: Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Toyosu, Tokyo 135-8548, Japan.
authors: Naoki
authors: N
authors: Hosoya
authors: The BioRobotics Institute, Scuola Superiore Sant'Anna Polo Sant'Anna Valdera, Viale Rinaldo Piaggio 34 56025 Pontedera, Italy.
authors: Matteo
authors: M
authors: Cianchetti
authors: The BioRobotics Institute, Scuola Superiore Sant'Anna Polo Sant'Anna Valdera, Viale Rinaldo Piaggio 34 56025 Pontedera, Italy.
authors: Cecilia
authors: C
authors: Laschi
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D005782:Gels / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008670:Metals / Q000737:chemistry; D008956:Models, Chemical; D009038:Motion; D009997:Osmotic Pressure; D010084:Oxidation-Reduction; D010507:Periodicity; D012997:Solvents / Q000737:chemistry; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D005782:Gels; D007477:Ions; D008670:Metals; D012997:Solvents; D014867:Water; C052970:poly-N-isopropylacrylamide