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Lee, Jinkee,Kim, Sunho,Kim, Sung-Min,Song, Ryungeun,Kim, Hyun Kyu,Park, Jang Sang,Park, Sun Cheol SAGE Publications 2016 The journal of vascular access Vol.17 No.6
<P>Conclusions: An obtuse radiocephalic wrist AVF shows more favorable patency compared to a classic radiocephalic AVF. Surgeons establishing a radiocephalic wrist AVF would be better to consider an AVF with an obtuse anastomosis.</P>
Humidity responsive single-layered film fabricated by hydrophilic titanium oxide nanotubes
Lee, Minki,Han, Gyuhyeon,Lee, Jinkee American Institute of Physics 2019 Applied Physics Letters Vol.115 No.9
<P> We fabricated a humidity responsive film comprising a bundle of titanium oxide tubes, which changes its curvature corresponding to the relative humidity. The mechanism of changing the curvature of the film can be explained by adsorption, condensation, and evaporation of water molecules within the film. During adsorption, a liquid bridge is formed because of the growth of a water layer between tubes, thus contracting the tubes. When vapor pressure exceeds the equilibrium vapor pressure, condensation occurs at the meniscus of the liquid bridge, thus expanding the gap between tubes. We obtained the adsorption and desorption isotherms for the humidity responsive film by determining physical adsorption. Additionally, we demonstrated the varying motions of the humidity sensing film when a water droplet was applied on the surface. The sensor could distinguish between saturated and oversaturated humidity conditions, such as fog and rain, respectively, which is not possible using resistive humidity sensors. This humidity responsive film can be applied to environmental monitoring systems and possibly even to energy harvesting systems. </P>
Nature-inspired porous gas sensor with stable response in humid condition
Cheonji Lee(이천지),Sunjong Oh(오선종),Seung-Chul Park(박승철),Jinkee Lee(이진기),Hyuneui Lim(임현의) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Animals have an excellent sense of smell because they have more olfactory cells than humans. In particular, dogs with great olfactory ability have 1000 times more olfactory receptor cells and 6-50 times larger area of epithelial cells than humans. Likewise, in gas sensors, the ability to detect gas is improved through nanostructures and porous structures. Unlike olfactory cells, ceramic gas sensors that measure gas by reacting with oxygen on the surface have errors depending on the environment and the gas selectivity. Previous studies have shown selectivity for gases by controlling the operating temperature of the gas sensor. However, humidity interferes with the signal to other gases by bonding with oxygen on the surface. In our study, we design a nanoporous ceramic gas sensor that has stable signals even in a humid environment.