Kim, J Kim, B Ryu, J Jeong, Y Park, J Kim, HC Chun, K 2024-01-21T04:40:55Z 2024-01-21T04:40:55Z 2021-09-03 2005-07 0021-4922 https://pubs.kist.re.kr/handle/201004/136332 To use poly-N-Isopropylacrylamide (PNIPAAm) as an actuator, we investigated its general characteristics such as swelling/deswelling ratio, response time and swelling force. Through out the variation, a change in volume of over 600% of PNIPAAm and a force generation of gram force order was obtained. Furthermore, we measured the significant change of friction caused by phase transition phenomena that is hydrophobic and hydrophilic. Surface condition that influences friction force can be reversed from swelling phase to deswelling phase by controlling the temperature of PNIPAAm. To verify the potential application of PNIPAAm using this characteristic, we compared its friction force under glass and small-intestine tissue of a pig. It was found that the level of friction differs significantly depending on phase change of PNIPAAm. Based on this knowledge, we could conclude that PNIPAAm can be applied to the stopping mechanism of in-body locomotion in order to replace the clamping mechanism of in body robot for locomotion on the gastrointestinal tract. English JAPAN SOC APPLIED PHYSICS Potential of thermo-sensitive hydrogel as an actuator Article 10.1143/JJAP.44.5764 1 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, v.44, no.7B, pp.5764 - 5768 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 44 7B 5764 5768 scie scopus 000232029300101 2-s2.0-31844455477 Physics, Applied Physics Article; Proceedings Paper thermo-sensitive hydrogel NIPAAm actuator friction force