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Lipid-Hydrogel-Nanostructure Hybrid and Its Anti-Biofilm Properties
Hyun-Ha Park(박현하),Kahyun Sun(선가현),Hoon Yi(이훈),Hangil Ko(고한길),Minho Seong(성민호),Insol Hwang(황인솔),SangHyun Lee(이상현),Minsu Kang(강민수),Hyunwook Ko(고현욱),Hoon-Eui Jeong(정훈의) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Despite extensive efforts toward developing anti-biofilm materials, efficient prevention of biofilm formation remains challenging. Diverse polymeric materials with bactericidal or antifouling properties have strong potential as efficient antibiofilm materials. However, approaches based on a single strategy using either bactericidal polymers, antifouling coatings, or nano-patterning of polymers have shown limited performance in the prevention of biofilm formation. This study presents a lipid-hydrogel-nanotopography hybrid that has highly efficient biofilm-resistant properties. The hybrid material consists of nanostructured antifouling, biocompatible polyethylene glycol (PEG)-based polymer covered with a membrane-mimicking, antifouling, biocompatible zwitterionic polymer of 2-methacryloryloxyethyl phosphorylcholine (MPC). Surface chemistry of the polymeric hybrid is analyzed with attenuated total reflectance-fourier transform infrared (ATR-FTIR) spectroscopy and x-ray photoelectron spectroscopy (XPS). Based on the unique heterogeneous chemical compositions, the lipid-hydrogel-nanostructure hybrid exhibits superior dual functionalities of antifouling and bactericidal activities against gram-negative and -positive bacteria, compared with those of surfaces composed of single type of polymer.
SnO<sub>2</sub> 나노와이어를 이용한 저온동작 고감도 고선택성 NO<sub>2</sub> 가스센서
김유종 ( Yoojong Kim ),박소영 ( So-young Bak ),이정석 ( Jeongseok Lee ),이세형 ( Se-hyeong Lee ),우경완 ( Kyoungwan Woo ),이상현 ( Sanghyun Lee ),이문석 ( Moonsuk Yi ) 한국센서학회 2021 센서학회지 Vol.30 No.3
In this paper, methods for improving the sensitivity of gas sensors to NO<sub>2</sub> gas are presented. A gas sensor was fabricated based on an SnO<sub>2</sub> nanowire network using the vapor-phase-growth method. In the gas sensor, the Au electrode was replaced with a fluorinedoped tin oxide (FTO) electrode, to achieve high sensitivity at low temperatures and concentrations. The gas sensor with the FTO electrode was more sensitive to NO<sub>2</sub> gas than the sensor with the Au electrode: notably, both sensors were based on typical SnO<sub>2</sub> nanowire network. When the Au electrode was replaced by the FTO electrode, the sensitivity improved, as the contact resistance decreased and the surface-to-volume ratio increased. The morphological features of the fabricated gas sensor were characterized in detail via field-emission scanning electron microscopy and X-ray diffraction analysis.