TY - GEN
T1 - Potential of poly-(N-Isopropylacrylamide) hydrogel as a clamper of the microrobot in gastrointestinal tract
AU - Jinseok, Kim
AU - Soohyun, Kim
AU - Yongwon, Jeong
AU - Sewan, Park
AU - Hyeon, Cheol Kim
AU - Kukjin, Chun
AU - Byungkyu, Kim
PY - 2005
Y1 - 2005
N2 - We successfully demonstrate that a thermally actuated reversible hydrogel, the poly N-Isopropylacrylamide (PNIPAAm), based clampers holds the intestines of a pig during the inchworm motion of microrobot. Although there are no direct relationship between hydro affinity and friction force, we found the significant friction force difference according to the surface condition change of PNIPAAm hydrogel. On the small intestine of a pig, a clamping mechanism was realized based on simple switching hydrophobic / hydrophilic surface conditions of PNIPAAm due to heating / cooling. In order to estimate response time of the clamper, the characteristic transition time of PNIPAAm film from hydrophilic to hydrophobic condition was investigated. Water contact angle (WCA) was monitored to normalize the transition time characteristics of PNIPAAm film in the course of time. From these results, we calculated the minimum heating time of the various thickness of PNIPAAm film to the clamping after its change to the hydrophobic condition. The minimum heating time was 15 seconds until 1 mm thickness of PNIPAAm film had enough friction force.
AB - We successfully demonstrate that a thermally actuated reversible hydrogel, the poly N-Isopropylacrylamide (PNIPAAm), based clampers holds the intestines of a pig during the inchworm motion of microrobot. Although there are no direct relationship between hydro affinity and friction force, we found the significant friction force difference according to the surface condition change of PNIPAAm hydrogel. On the small intestine of a pig, a clamping mechanism was realized based on simple switching hydrophobic / hydrophilic surface conditions of PNIPAAm due to heating / cooling. In order to estimate response time of the clamper, the characteristic transition time of PNIPAAm film from hydrophilic to hydrophobic condition was investigated. Water contact angle (WCA) was monitored to normalize the transition time characteristics of PNIPAAm film in the course of time. From these results, we calculated the minimum heating time of the various thickness of PNIPAAm film to the clamping after its change to the hydrophobic condition. The minimum heating time was 15 seconds until 1 mm thickness of PNIPAAm film had enough friction force.
UR - http://www.scopus.com/inward/record.url?scp=33846911774&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33846911774
SN - 0780387406
SN - 9780780387409
T3 - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
SP - 4046
EP - 4049
BT - Proceedings of the 2005 27th Annual International Conference of the Engineering in Medicine and Biology Society, IEEE-EMBS 2005
T2 - 2005 27th Annual International Conference of the Engineering in Medicine and Biology Society, IEEE-EMBS 2005
Y2 - 1 September 2005 through 4 September 2005
ER -