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Highly Sensitive Artificial Skin Based on Stretchable Ionic Mechanotransducer
Eunsong Jee,Sangsik Park,Ming Linag Jin,Younghoon Lee,Ji Hye Lee,Junho Chung,Joo Sung Kim,Jong-Seon Kim,Dae Woo Kim,Jae Woo Chung,Seung Geol Lee,Dukhyun Choi,Hee-Tae Jung,Do Hwan Kim 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2
Jang, Sukjin,Jee, Eunsong,Choi, Daehwan,Kim, Wook,Kim, Joo Sung,Amoli, Vipin,Sung, Taehoon,Choi, Dukhyun,Kim, Do Hwan,Kwon, Jang-Yeon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.37
<P>The development of a highly sensitive artificial mechanotransducer that mimics the tactile sensing features of human skin has been a big challenge in electronic skin research. Here, we demonstrate an ultrasensitive, low-power oxide transistor-based mechanotransducer modulated by microstructured, deformable ionic dielectrics, which is consistently sensitive to a wide range of pressures from 1 to 50 kPa. To this end, we designed a viscoporoelastic and ionic thermoplastic polyurethane (i-TPU) with micropyramidal feature as a pressure-sensitive gate dielectric for the indium-gallium-zinc-oxide (IGZO) transistor-based mechanotransducer, which leads to an unprecedented sensitivity of 43.6 kPa<SUP>-1</SUP>, which is 23 times higher than that of a capacitive mechanotransducer. This is because the pressure-induced ion accumulation at the interface of the i-TPU dielectric and IGZO semiconductor effectively modulates the conducting channel, which contributed to the enhanced current level under pressure. We believe that the ionic transistor-type mechanotransducer suggested by us will be an effective way to perceive external tactile stimuli over a wide pressure range even under low power (<4 V), which might be one of the candidates to directly emulate the tactile sensing capability of human skin.</P> [FIG OMISSION]</BR>
Ultrastructural deformity of ovarian follicles induced by different cryopreservation protocols
Kim, Gil Ah,Kim, Hwa Young,Kim, Jee Woong,Lee, Gene,Lee, Eunsong,Lim, Jeong Mook Elsevier 2010 Fertility and sterility Vol.94 No.4
<P>Ultrastructural deformities were monitored after cryopreservation of F1 (B6CBAF1) mouse ovaries by either slow freezing or vitrification. Vacuole formation in the ooplasm, zona pellucida, and the cytoplasm of follicular cells, and mitochondrial deformity were detected. These types of cryodamage demonstrated protocol specificity.</P>