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서갑양(K. Y. Suh),정훈의(H. E. Jeong) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A direct molding is a simple and yet robust method for fabricating well-defined microstructures of a hydrophilic biopolymer over a large area. The method consists of three steps: placing a polydimethylsiloxane mold with a bas-relief pattern onto a drop-dispensed polymer solution dissolved in water, letting the mold and the solution undisturbed in contact until solvent evaporates completely, and leaving behind a polymer replica after mold removal. In such a molding process, water can only evaporate from the edges of the mold due to impermeable nature of PDMS, resulting in a nonuniform distribution of film thickness or pattern height. Here we examine systematically how the evaporation rate affects the thickness distribution of the resulting microstructures by evaporating the solution of hyaluronic acid in various conditions. To compare with a theory, we also present a simple theoretical model.
2단계 모세관 리소그라피 기술을 이용한 마이크로/나노 병합구조물 공정 기술 및 수학적 모델을 통한 표면 특성 분석
서갑양(H. E. Jeong),정훈의(S. H. Lee),이성훈(J. K. Kim),김재관(K. Y. Suh) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
A simple method for fabricating micro/nanoscale hierarchical structures is presented using a two-step temperaturedirected capillary molding technique. This lithographic method involves a sequential application of molding process in which a uniform polymer-coated surface is molded with a patterned mold by means of capillary force above the glass transition temperature of the polymer. Using this approach, multiscale hierarchical structures for biomimetic functional surfaces can be fabricated with precise control over geometrical parameters and the wettability of a solid surface can be designed in a controllable manner.