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dc.contributor.author Park, Jinhee -
dc.contributor.author Jo, Kyoung Ho -
dc.contributor.author Park, Hyo Yul -
dc.contributor.author Hahn, Jong Hoon -
dc.date.available 2017-07-05T08:34:39Z -
dc.date.created 2017-04-10 -
dc.date.issued 2016-09 -
dc.identifier.issn 0925-4005 -
dc.identifier.uri http://hdl.handle.net/20.500.11750/2208 -
dc.description.abstract This study presents spatially controlled silica coating in poly(dimethylsiloxane) (PDMS) microchannels using the well-known sol-gel process. First, the corona discharge between two Pt electrodes inserted into the microchannels generated silanol groups at the desired location for further modifications. Next, the cross-linking of the silanol groups with silica sol produced a chemically bonded silica surface in the PDMS microchannels. After any remaining unreacted silica sol was removed from the channels with organic solvents, a spatially patterned glass-like surface was observed on the PDMS microchannels. The introduced hydrophilicity and chemical stability of the silica coated PDMS was characterized with various analytical techniques including contact angle analysis, charge-coupled device (CCD) imaging, scanning electron microscopy (SEM), electro-osmotic flow (EOF) mobility measurement, neutral dye BODIPY/organic solvents absorption test and capillary gel electrophoresis. The water contact angle of the silica coated PDMS decreased, and the absorption of BODIPY was substantially suppressed in the silica coated PDMS microchannels while the native ones exhibited an increased fluorescent background signal within 10 min after BODIPY injection. The EOF of the silica coated surface was one order of magnitude higher than the ones with the native PDMS surface for a wide range of pHs. Polyacrylamide gel was immobilized in the silica coated PDMS microchannels, and a DNA ladder was successfully separated in the microchannel. PDMS microfluidic devices with enhanced wettability and stability can be used in multistep chemical syntheses and in various bio- and medical technologies. © 2016 Elsevier B.V. All rights reserved. -
dc.publisher Elsevier -
dc.title Spatially controlled silica coating in poly(dimethylsiloxane) microchannels with the sol-gel process -
dc.type Article -
dc.identifier.doi 10.1016/j.snb.2016.03.148 -
dc.identifier.scopusid 2-s2.0-84962917876 -
dc.identifier.bibliographicCitation Sensors and Actuators B: Chemical, v.232, pp.428 - 433 -
dc.description.isOpenAccess FALSE -
dc.subject.keywordAuthor Poly(dimethylsiloxane) microchip -
dc.subject.keywordAuthor Surface modification -
dc.subject.keywordAuthor Corona discharge -
dc.subject.keywordAuthor Local silica coating -
dc.subject.keywordAuthor Sol-gel process -
dc.subject.keywordPlus Biomedical Engineering -
dc.subject.keywordPlus Capillary Electrophoresis -
dc.subject.keywordPlus Capillary Gel Electrophoresis -
dc.subject.keywordPlus CHANNELS -
dc.subject.keywordPlus Charge Coupled Devices -
dc.subject.keywordPlus Chemical Analysis -
dc.subject.keywordPlus Chemical Stability -
dc.subject.keywordPlus Coatings -
dc.subject.keywordPlus Contact Angle -
dc.subject.keywordPlus Contact Angle Analysis -
dc.subject.keywordPlus Corona Discharge -
dc.subject.keywordPlus Corona Discharges -
dc.subject.keywordPlus Electric Corona -
dc.subject.keywordPlus Electroosmosis -
dc.subject.keywordPlus ELECTROOSMOTIC FLOW -
dc.subject.keywordPlus Electrophoresis -
dc.subject.keywordPlus HYBRID -
dc.subject.keywordPlus Local Silica Coating -
dc.subject.keywordPlus Medical Technologies -
dc.subject.keywordPlus Microchannels -
dc.subject.keywordPlus MICROCHIP ELECTROPHORESIS -
dc.subject.keywordPlus MICRofLUIDIC DEVICES -
dc.subject.keywordPlus Microfluidics -
dc.subject.keywordPlus Mobility Measurements -
dc.subject.keywordPlus PDMS MICROCHIP -
dc.subject.keywordPlus PDMS Microfluidic Device -
dc.subject.keywordPlus Poly(Dimethylsiloxane) Microchip -
dc.subject.keywordPlus POLYACRYLAMIDE -
dc.subject.keywordPlus Polydimethylsiloxane -
dc.subject.keywordPlus Polydimethylsiloxane Pdms -
dc.subject.keywordPlus Scanning Electron Microscopy -
dc.subject.keywordPlus Separation -
dc.subject.keywordPlus Silica -
dc.subject.keywordPlus Silica Coatings -
dc.subject.keywordPlus Sol-Gel Process -
dc.subject.keywordPlus Surface Modification -
dc.subject.keywordPlus Surface Treatment -
dc.subject.keywordPlus Water Absorption -
dc.subject.keywordPlus Water Injection -
dc.citation.endPage 433 -
dc.citation.startPage 428 -
dc.citation.title Sensors and Actuators B: Chemical -
dc.citation.volume 232 -
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