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문명운(Myoung-Woon Moon),차태곤(Tae-Gon Cha),이광렬(Kwang-Ryeol Lee),Ashkan Vaziri,김호영(Ho-Young Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Inspired by the gecko's footpad structure, we developed a method to create tilted micropillars on the surface of an elastomeric polymer mimicking the geometry of gecko's setae. The method combines son lithography to create straight micropillars and ion beam irradiation to tilt the straight micropillars in a controlled fashion. We experimentally quantify the asymmetric adhesion and friction characteristics of the fabricated tilted micropillars as a function of the tilting angles. The tilting angle of the pillars was varied by changing the incident angle and duration of the ion beam irradiation. Potential applications of the developed pattern include non-wetting painting and switchable adhesion essential in wall-climbing robots.
이주희(Joohee Lee),문명운(Myoung-Woon Moon),김성진(Seong Jin Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The Janus membrane with asymmetric wettability has been extensively utilized in diverse engineering fields, including fog harvesting. The Janus wettability is known to improve fog harvesting performance by facilitating water drainage as well as decreasing the re-evaporation rate. In the present work, fog harvesting experiments were performed by fabricating Janus mesh with different hole sizes. The experiment revealed that the Janus property, which causes spontaneous water transport through either clogged or non-clogged mesh holes, is beneficial in increasing fog-harvesting yield. Furthermore, it showed that the non-clogging Janus mesh collected more fog than the clogged Janus mesh, emphasizing the significance of maintaining fog particle inertia by not causing high resistance to the fog flow.
김성진(Seong Jin Kim),문명운(Myoung-Woon Moon),이광렬(Kwang-Ryeol Lee),장영수(Young Soo Chang),이대영(Dae-Young Lee),김호영(Ho-Young Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
This article considers vertical spreading on superhydrophilic non-woven structure. It is well known that general flows on vertical surface fall down by the effect of gravity (gravity dominant flow). However, circular spreading emerges on our superhydrophilic fabric structure with overwhelming capillary force (capillary dominant flow). Analysis about forces acting on vertical flows makes possibie to construct regime map categorizing different flowing patterns.
젖음성 차이와 무전해도금을 이용한 연성 구리 회로패턴 형성
박상진,고태준,윤주일,문명운,한준현,Park, Sang-Jin,Ko, Tae-Jun,Yoon, Juil,Moon, Myoung-Woon,Han, Jun Hyun 한국재료학회 2015 한국재료학회지 Vol.25 No.11
Cu circuits were successfully fabricated on flexible PET(polyethylene terephthalate) substrates using wettability difference and electroless plating without an etching process. The wettability of Cu plating solution on PET was controlled by oxygen plasma treatment and $SiO_x$-DLC(silicon oxide containing diamond like carbon) coating by HMDSO(hexamethyldisiloxane) plasma. With an increase of the height of the nanostructures on the PET surface with the oxygen plasma treatment time, the wettability difference between the hydrophilicity and hydrophobicity increased, which allowed the etchless formation of a Cu pattern with high peel strength by selective Cu plating. When the height of the nanostructure was more than 1400 nm (60 min oxygen plasma treatment), the reduction of the critical impalement pressure with the decreasing density of the nanostructure caused the precipitation of copper in the hydrophobic region.
Fabrication of nanofluidic channels with directed wrinkle/buckling patterns
Seok Chung(정석),Myoung-Woon Moon(문명운),Jeong Hoon Lee(이정훈),Jongyoon Han(한종윤),Roger D. Kamm 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Interest has grown recently in the concept of "unconventional nanofabrication", the creation of nanoscale features by methods that avoid the technical hurdles and high cost of nano-lithographic processes. One of the challenges has been to reliably and inexpensively produce channels of nanometer dimension, as small as 60 ㎚, in the materials commonly used for soft lithography. In this manuscript, we present new approaches based on simple concepts of wrinkle and buckling patterns.
플라즈마 식각을 이용한 기울어진 초소수성 나노 구조의 젖음 현상 연구
신봉수(Bongsu Shin),문명운(Myoung-Woon Moon),이광렬(Kwang-Ryeol Lee),김호영(Ho-Young Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In this study, we mimic tilted micro and nano hair of water strider leg. Through plasma enhanced chemical vapor deposition and hybrid ion beam, we develop superhydrophobic tilted nanostructure on polytetrafluoroethylene. Using CF<SUB>4</SUB> plasma, nanostructure is developed on 2-D surface and Ar plasma through hybrid ion beam generates tilted nano hairy structure on 3-D structure. The wetting behavior of superhydrophobic surface is evaluated by the measurement of contact angle and contact angle hysteresis.
플라즈마 DLC 증착법을 이용한 실리콘 표면의 친수성 유지
이진우(Jin Woo Yi),문명운(Myoung-Woon Moon),이광렬(Kwang-Ryeol Lee),김해리(Hae-Ri Kim),김성진(Seong Jin Kim),차태곤(Tae-Gon Cha),김호영(Ho-Young Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Aging behavior of wettability of Si-DLC (Si incorporated diamond-like carbon) films treated by various gas (H₂, O₂, and N₂) plasma was investigated. We found that the initially low contact angle of most plasma-treated Si-DLC surfaces recovered its high value (near 90°) within few days. However, the contact angle of Si-DLC with the Si weight fraction of 1.24 and 2.66% was measured to be below 10° as-modified, and maintained its value below 15° for 20 days. XPS analysis reveals that the polar components of Si-O bonds, enhancing hydrophilicity, have been almost unchanged over 20 days on the Si-DLC modified with oxygen plasma. Further explanation for this superior durability of the superhydrophilicity comes from observing the surface morphology evolution due to oxygen plasma treatment: nano-pillar-like structures develop on Si-DLC with the Si weight fraction of 1.24 and 2.66% due to oxygen plasma while no surface structure change is observed on films with other Si fractions.