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PDMS 몰드를 이용한 반구 형상의 니켈 금속 메쉬의 제작
박치열(Chi Yeol Park),이상민(Sang Min Lee),배승일(Seung Il Bae),고종수(Jong Soo Ko) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A unique fabrication method for a hemisphere-shape nickel micromesh is proposed and demonstrated. A PDMS mold was fabricated using a microcasting process and then used as a flexible mold in nickel electroplating. The fabricated nickel micromesh was well formed and connected without any cracks within the entire mold area. The experimental results veri tied that the fabricated features of the nickel micromesh accurately followed the shape of the microstructures and the curvature of the PDMS mold. This unique fabrication method provides an alternative means to produce three-dimensional metal microstructures.
오혁근,박치열,이재문,이익춘,O, Hyeok Geun,Park, Chi Yeol,Lee, Jae Mun,Lee, Ik Chun Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.4
The kinetics and mechanism of the reactions of thiophenyl dimethylacetates (TDA) and trimethylacetates (TTA) with benzylamines in acetonitrile are studied. The reactions are first order in both the amine and the substrate. Relatively large values of ${\beta}X(\betanuc$ = 1.1-1.5; TDA and 1.1-1.5; TTA) and ${\beta}Z({\beta}lg$ = -1.8~-2.0; DTA and -1.3~-1.6; TTA) for benzylamines, significantly large kH/kD values (=1.2-1.5; DTA and 1.2-1.5; TTA) involving deuterated benzylamines, and large ${\rho}XZ$ (=0.82; TDA and 1.05; TTA) values are interpreted to indicate stepwise acyl transfer mechanism, but with the hydrogen bonded four center type transition state for benzylamine. The relatively greater magnitudes of ${\rho}XZ$ and the secondary kinetic isotope effects involving deuterated nucleophiles are in line with the proposed mechanism.
원형 미세 홀 어레이를 가진 니켈 메쉬 시트의 방수 특성 및 응용가능성 평가
이상민(Sang Min Lee),박치열(Chi Yeol Park),배승일(Seung Il Bae),고종수(Jong Soo Ko) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Nickel micromesh sheets with circular microhole array were designed and fabricated and their water-proof abilities were characterized. The micromesh enabled the material waves, including sound and light waves, to pass through the microholes, but repelled water. Reducing the hole size and increasing the lattice width of the micromesh are necessary to improve the water-proof ability.
이상민(Sang Min Lee),정임덕(Im Deok Jung),박치열(Chi Yeol Park),고종수(Jong Soo Ko) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Surface wettability on the micro nano multi-scale structures has been examined. To evaluate the influence of the nano structures on the contact angles, we fabricated two different kinds of nano structures: bump-type and tip-type nano structures. Bump-type and tip-type nano structures were fabricated by reactive ion etching (RIE) and deep reactive ion etching (DRIE) processes, respectively. For the hydrophobic coating, plasma polymerized fluorocarbon (PPFC) was finally deposited onto the fabricated structures. The fabricated micro nano multi-scale structures showed a very high contact angle, ca 170°.
PDMS 유연 몰드를 이용한 구리 마이크로 메쉬 시트의 제작
정순녕(Sun Nyeong Jung),강창근(Chang Kun Kang),정임덕(Im Deok Jung),배공명(Kong Myeong Bae),박치열(Chi Yeol Park),정필구(Phill Gu Jung),고종수(Jong Soo Ko) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.12
A unique fabrication method for a copper micromesh is proposed and demonstrated. A PDMS mold was fabricated using a microcasting process and then used as a flexible mold in copper electroplating. The fabricated copper micromesh was well formed and connected without any cracks within the entire mold area. The experimental results verified that the fabricated features of the copper micromesh accurately followed the shape of the microstructures of the PDMS mold. This unique fabrication method provides an easy yet precise means of producing three-dimensional metal microstructures.