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- 저자 : 남경목(Kyungmok Nam) (검색결과 5 건)
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남경목(Kyungmok Nam),박성민(Sungmin Park),김도훈(Dohoon Kim),김종훈(Jonghun Kim),윤상희(Sang-Hee Yoon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
An elastomer (especially, polydimethylsiloxane (PDMS)) sponge is considered as a strong selective absorbent in solving environmental issues of chemical and oil spills. The performance of a PDMS sponge in capturing and separating crude oil from (sea) water depends on diverse factors such as surface geometry, surface physicochemistry, hydrostatic stability, etc. Here, after presenting how to achieve a porous PDMS block having numerous micro-sized holes that act as absorption and storage spaces of target material, we report an experimental effort in controlling the surface physicochemistry (i.e., hydrophobicity or hydrophilicity) of the porous PDMS block through adjusting the size of the micro-sized holes and the concentration of a surfactant (i.e., silwet L-77). Based on the experimental results, we understand the mechanism of controlling the surface physicochemistry of PDMS by water-soluble particles and surfactant. The absorbing behavior of the porous PDMS block is also extensively discussed.
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남경목(Kyungmok Nam),박성민(Sungmin Park),김종훈(Jonghun Kim),윤상희(Sang-Hee Yoon) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.8
다공성 탄성체는 기름유출과 같은 상황에서 적용 가능한 선택적 흡수재로 각광을 받고 있다. 다공성 탄성체의 선택적 흡수효율은 표면 거칠기, 물리화학적 처리기법, 수압안정성 등의 영향을 받는다. 본 연구에서는 PDMS(polydimethylsiloxane), 미소 소금입자 및 계면활성제(silwet L-77)를 이용하여 다공성 PDMS를 제작하는 방법에 대해 설명한 후, 제작과정 중 물리화학적 처리를 통해 상기 다공성 PDMS의 소수성을 강화하거나 혹은 그 특성을 친수성으로 만드는 방법에 대해 기술한다. 물리적 처리방법으로는 소금입자의 크기조절을 통해 공극 크기(혹은 표면 거칠기)를 조절하고 화학적 처리방법으로는 계면활성제의 혼합비를 조절하여 표면 에너지를 변화시킨다. 제작된 다공성 PDMS를 이용하여 접촉각 및 흡수율을 측정함으로써 소금입자의 직경과 계면활성제의 혼합비가 다공성 PDMS의 접촉각과 흡수율에 미치는 영향을 정량적으로 측정한다. An elastomer (especially PDMS) sponge is considered to be a promising selective absorber in cleaning up oil spills. The performance of a PDMS sponge in capturing and separating oil from (sea) water depends on several parameters such as surface roughness, physicochemical treatments, and hydrostatic stability. Here, we first present a method of fabricating the PDMS sponges having numerous micro-sized pores that act as absorption and storage spaces for the target material, and then we report an experimental effort undertaken to control the surface physicochemistry (i.e., hydrophobicity or hydrophilicity) of the PDMS sponges by adjusting the size of the pores and the concentration of the surfactant (i.e., silwet L-77). From the experimental results, we develop an in-depth understanding of the mechanism for controlling the surface physicochemistry of PDMS using water-soluble micro-sized particles and a surfactant. The surface energy and absorbing behavior of the PDMS sponges are also extensively discussed.
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탄성중합체와 박리 후 파쇄된 흑연입자 복합재 기반 고감도 대변형률 연성센서
김도훈(Dohoon Kim),박성민(Sungmin Park),김종훈(Jonghun Kim),남경목(Kyungmok Nam),윤상희(Sang-Hee Yoon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
A new composite composed of exfoliated and fragmented graphite (EFG) particles blended with an elastomer is a promising material for fabricating soft sensors that can detect large deformation up to or more than 50% with high sensitivity. Here, we develop high-sensitive, large-strain, sprayable soft sensors using a mixture of EFG and polydimethylsiloxane (PDMS) where EFG and PDMS are used as electrically conductive particles and a host elastomer, respectively. This begins with microwave-assisted graphite exfoliation, followed by ultrasonication-induced fragmentation of exfoliated graphite and ultrasonic blending of EFG and PDMS. Using the prepared composite, 1-axis and 3-axis soft sensors are fabricated by airbrush stencil technique where mixture and pure PDMS play roles as sensing and insulating layers, respectively. In the experimental study, we investigate the performance of our soft strain sensors after characterizing the mechanical compliance and electrical conductance of the composite as a function of EFG/PDMS wt%. The soft sensors are expected to be used in biomechanics, robotics, and structure health monitoring.
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다방향 자외선 노광법을 이용한 3차원 고종횡비 미소구조물 제작
박성민(Sungmin Park),김종훈(Jonghun Kim),김도훈(Dohoon Kim),남경목(Kyungmok Nam),윤상희(Sang-Hee Yoon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
3D high-aspect-ratio (HAR) microstructures for biomedical applications are microfabricated using multidirectional ultraviolet (UV) lithography, which includes a combination of inclined, rotational, and reverse-side exposure processes. The inclined and rotational UV exposure processes are intended to fabricate axisymmetric HAR microstructures; the reverse-side UV exposure process is designed to sharpen an end tip of the microstructures by minimizing UV reflection on a substrate which is inevitable in conventional UV lithography. Our multidirectional UV lithography is characterized using an epoxy-based negative photoresist, SU-8, together with a customized UV exposure system. The effect of multidirectional UV lithography on the geometry of the 3D HAR microstructures (e.g., inclined angle, height, curvature of end tip, etc.) is quantitatively discussed.
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