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Soft lithographic patterning of proteins and cells inside a microfluidic channel
서갑양,Suh, Kahp-Yang The Korean Vacuum Society 2007 Applied Science and Convergence Technology Vol.16 No.1
The control of surface properties and spatial presentation of functional molecules within a microfluidic channel is important for the development of diagnostic assays, microreactors, and for performing fundamental studies of cell biology and fluid mechanics. Here, we present soft lithographic methods to create robust microchannels with patterned microstructures inside the channel. The patterned regions were protected from oxygen plasma by controlling the dimensions of the poly(dimethylsiloxane)(PDMS) mold as well as the sequence of fabrication steps. The approach was used to pattern a non-biofouling polyethylene glycol(PEG)-based copolymer or the polysaccharide hyaluronic acid(HA) within microfluidic channels. These non-biofouling patterns were then used to fabricate arrays of fibronectin(FN) and bovine serum albumin(BSA) as well as mammalian cells. 마이크로유체 채널 내에서 표면 성질과 기능성 분자들의 공간적인 위치를 제어하는 것은 진단소자, 마이크로 반응기, 또는 세포와 마이크로 유체역학의 기본적인 연구를 일해 매우 중요하다. 이 논문에서는 소프트 리소그라피 방법을 이용하여 채널 안에 패턴된 구조물을 포함하는 안정적인 마이크로 채널을 제작하는 방법을 소개하려 한다. 먼저 패턴된 영역을 폴리디메틸실록세인(PDMS) 몰드의 치수와 제작 과정을 적당히 조절함으로써 산소 플라즈마로부터 보호한다. 마이크로 구조물은 대표적인 생물오손(biofouling) 억제 물질인 폴리에틸렌 글리콜(PEG)계 공중합 고분자 혹은 다당류인 히알루산(HA)을 패턴하여 얻었으며 이러한 패턴을 이용하여 피브로넥틴(FN), 소의 혈장 알부민(BSA) 등의 단백질과 동물 세포의 어레이를 제작하였다.
Fabrication of high aspect ratio nanostructures using capillary force lithography
서갑양,김재관,이성훈,정훈의,박지원 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.4
(MINS101m, Minuta Tech.) has recently been introduced as an alternative to replace polydimethylsiloxane (PDMS)mold for sub-10-nm lithography. Here, we demonstrate that this mold allows for fabrication of various high aspectratio nanostructures with an aspect ratio as high as 4.4 for 80 nm nanopillars. For the patterning method, we used cap-illary force lithography (CFL) involving direct placement of a polyurethane acrylate mold onto a spin-coated polymerfilm followed by raising the temperature above the glass transition temperature of the polymer (Tg). For the patterningmaterials, thermoplastic resins such as polystyrene (PS) and poly(methyl methacrylate) (PMMA) and a zinc oxideapplication of the same method, which is potentially useful for mimicking functional surfaces such as lotus leaf.
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.
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.
2 단계 모세관 리소그라피 기술을 이용한 마이크로/나노스케일 복합 구조의 제조 및 표면 특성 분석
서갑양(Kahp Yang Suh),정훈의(Hoon Eui Jeong),이성훈(Sung Hun Lee),김재관(Jae Kwan Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this paper, a simple method for fabricating micro/nanoscale combined hierarchical structures is presented using a two-step temperature-directed capillary molding technique. This lithographic method consists of two steps: (ⅰ) fabrication of polymer microstructures using a PDMS mold and (ⅱ) subsequent nanofabrication using a high-resolution polyurethane acrylate (PUA) mold on top of the pre-formed microstructures. The resulting micro/nano combined structures were robust and demonstrated enhanced water-repellent properties by coexistence of homogeneous and heterogeneous wettings, as confirmed by contact angle measurement of water. An analytical model was suggested to explain our experimental observations and shows a good agreement with the experimental results.