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Surya Pandita,박훈철,Hyoung Tae Lim,Young Tai Yoo 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
A mixture of 1-ethyl-3methylimidazolim trifluoromethanesulfonate ionic liquid and ethylene glycol was investigated as an inner solvent of ionic polymer metal composites (IPMC). The surface resistances of the IPMCs with the mixed solvents were 15 times higher than those of the water-based IPMCs, but they were 2 times lower than those of IPMCs with ethylene glycol. The increase in the surface resistance of non-water based IPMCs was triggered by electrode damage due to polymer swelling during the solvent exchanger process from water to the mixed solvent or to ethylene glycol. The actuation performance of the IPMC with the mixed solvent was significantly increased compared to that of the IPMC containing only ethylene glycol. This must be attributed to the high conductivity of the ionic liquid and to less electrode damage.
Performance Improvement of IPMC (Ionic Polymer Metal Composites) for a Flapping Actuator
Soon-Gie Lee,Hoon-Cheol Park,Surya D. Pandita,Youngtai Yoo 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.6
In this paper, a trade-off design and fabrication of IPMC (Ionic Polymer Metal Composites) as an actuator for a flapping device have been described. Experiments for the internal solvent loss of IPMCs have been conducted for various combinations of cation and solvent in order to find out the best combination of cation and solvent for minimal solvent loss and higher actuation force. From the experiments, it was found that IPMCs with heavy water as their solvent could operate longer. Relations between length/thickness and tip force of IPMCs were also quantitatively identified for the actuator design from the tip force measurement of200, 400, 640, and 800㎛ thick IPMCs. All IPMCs thicker than 200㎛ were processed by casting Nafion™ solution. The shorter and thicker IPMCs tended to generate higher actuation force but lower actuation displacement. To improve surface conductivity and to minimize solvent evaporation due to electrically heated electrodes, gold was sputtered on both surfaces of the cast IPMCs by the Physical Vapor Deposition (PVD) process. For amplification of a short IPMC's small actuation displacement to a large flapping motion, a rack-and-pinion type hinge was used in the flapping device. An insect wing was attached to the IPMC flapping mechanism for its flapping test. In this test, the wing flapping device using the 800㎛ thick IPMC could create around 10°~85° flapping angles and 0.5~15㎐ flapping frequencies by applying 3~4V.