A thermo-sensitive hydrogel actuator in dry environment

Jinseok Kim, Soohyun Kim, Yongwon Jeong, Sewan Park, Hyeon Cheol Kim, Byungkyu Kim, Kukjin Chun

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Thermo-sensitive hydro gel has hydrophilic 3-dimensional structure whose volume is expanded at lower critical solution temperature (LCST) and contracted below the critical temperature. However, the usage of hydro gel is limited because it needs to contain hydro ions in 3-diemnsional structure in order to initiate the volumetric change.1 Therefore; the hydro gel has been used only with a drug-delivery system and a passive valve in aqueous environments. In this paper, we proposed and demonstrated the new structure of poly N-isopropylacrylamide (NIPAAm) hydrogel actuator as shown in Fig.1. Fig.2. shows 3D molding structure fabricated by standard photolithography process which can contain water inside of itself in order to be used in dry environments independently. First swelling rate of synthesized NIPAAm polymer in water was measured and plotted as shown in Fig. 3 which volume changed 1000% respectively. And we will compare the basic characteristics of the NIPAAm actuator such as the working cycle and response time in dry and aqueous environment.2 In addition, unlike imprecise weigh measurement method; swelling/deswelling ratio of NIPAAm will be presented by exact volume measurement as shown in Fig. 4. Hot-plate was used to heat up a NIPAAm actuator since a micro heater system was not finally integrated with the NIPAAm actuator. However, heater integrated NIPAAm actuator will be presented with expecting to experiment on basic characteristics with it. Finally, we will develop the NIPAAm actuator with optimized structure which could have local deformation by its own heating system.

Original languageEnglish
Title of host publicationDigest of Papers - Microprocesses and Nanotechnology 2004
Number of pages2
Publication statusPublished - 2004
Externally publishedYes
Event2004 International Microprocesses and Nanotechnology Conference - Osaka, Japan
Duration: 2004 Oct 262004 Oct 29

Publication series

NameDigest of Papers - Microprocesses and Nanotechnology 2004


Other2004 International Microprocesses and Nanotechnology Conference


  • Actuator
  • Hydrogel
  • NIPAAm
  • Thermo-sensitive

ASJC Scopus subject areas

  • Engineering(all)


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