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나노구조를 가지는 표면에서의 수액적 형성에 대한 분자동역학 시뮬레이션
고정안(Jeong-Ahn Ko),최호진(Ho-Jin Choi),홍승도(Seong-Do Hong),윤현식(Hyun-Sik Yoon),하만영(Man-Yeong Ha) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In case of the roughness surface, it is well known, the contact angle between the wall and water droplet change. This means that we could control the hydrophilic or hydrophobic property using physical and chemical treatment of the surface. Experimental, theoretical and computational studies have been carried out over the past several decades to research the wetting phenomena of a droplet on the different surface structures. In this study, we study to the variation in contact angle of a nano-sized water droplet on the nano stripe-patterned surface by changing the height and width of the stripe pillar, and the gap width of the stripes.
천인범(In Beom Cheon),고정안(Jeong Ahn Ko),윤현식(Hyun Sik Yoon),하만영(Man Young Ha) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In the present study, the behaviors of nano water droplets were investigated using molecular dynamics simulation. In general, separated nano water droplets merge each other because of interactive force by Lennard-Jones potential and Couloumb potential. We focus on understanding the merging mechanisms of nano droplets. The calculations were extended to droplets having ratio of radii between 0.4 and 1.0 and initial distance between 2A and 8A , respectively. Then, we observed the shape of droplets and time spent on merging. The time spent on merging rises linearly with according to the increasing of droplet ratio as we expected. Also, the time spent on merging is getting increases with according to the increasing initial distance, however, when the initial distance is more than 8A merging time is observed to be perturbed.