Journal Textile Coloration and Finishing Year / Vol., Issue, Month 2022 / V.34,no.3,Sept Title Liquid Metal Enabled Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel for Reversible Electrical Switch Authors Taehwan Lim, Sohee Lee1,2, and Sang Young Yeo Institution/Affiliations Korea Institute of Industrial Technology, 1Gyeongsang National University, 2Research Institute of Na Pages/Total page pp.207 ~ 216 / 10 Language Korean Abstract Hydrogels have gained considerable attention in various fields due to their easily transformative ability by different stimulation. In addition, metal-based conductive additives can enable the hydrogels to be conductive with dimension change. Although the development of the additives offered enhanced electrical properties to the hydrogels, correspondingly enhanced mechanical properties may limit the volume and electrical properties switching after stimulation. Here we prepared poly(N-isopropylacrylamide) (PNIPAM) thermo-responsive hydrogel that has a 32℃ of low critical solution temperature and added liquid metal particles (LMPs) as conductive additives, possessing soft and stretchable benefits. The LMPs enabled PNIPAM (PNIPAM/LMPs) hydrogels to be constricted over 32℃ with a high volume switching ratio of 15.2 when deswelled. Once the LMPs are spontaneously oxidized in hydrogel culture, the LMPs can release gallium ions into the hydrogel nature. The released gallium ions and oxidized LMPs enhanced the modulus of the PNIPAM/LMPs hydrogel, triggering high mechanical stability during repeated swelling/deswelling behavior. Lastly, highly constricted PNIPAM/LMPs hydrogel provided a 5x106 of electrical switching after deswelling, and the switching ratio was closely maintained after repeated swelling/deswelling transformation. This study opens up opportunities for hydrogel use requiring thermo-responsive and high electrical switching fields. Keywords thermo-responsive, poly(n-isopropylacrylamide), liquide metal, electrical conductivity, property switch, property stability Download   Reference http://koreascience.or.kr/journal/OSGGBT/v34n3.page