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Spatially controlled silica coating in poly(dimethylsiloxane) microchannels with the sol-gel process

Title
Spatially controlled silica coating in poly(dimethylsiloxane) microchannels with the sol-gel process
Authors
Park, J[Park, Jinhee]Jo, KH[Jo, Kyoung Ho]Park, HY[Park, Hyo Yul]Hahn, JH[Hahn, Jong Hoon]
DGIST Authors
Park, J[Park, Jinhee]
Issue Date
2016-09
Citation
Sensors and Actuators, B: Chemical, 232, 428-433
Type
Article
Article Type
Article
Keywords
Biomedical EngineeringCapillary ElectrophoresisCapillary Gel ElectrophoresisCharge Coupled DevicesChemical AnalysisChemical StabilityCoatingsContact AngleContact Angle AnalysisCorona DischargeCorona DischargesElectric CoronaElectroosmosisElectrophoresisLocal Silica CoatingMedical TechnologiesMicro-FluidicsMicrochannelsMobility MeasurementsPDMS Microfluidic DevicePoly(Dimethylsiloxane) MicrochipPolydimethylsiloxane (PDMS)Scanning Electron MicroscopySilicaSilica CoatingsSol-Gel ProcessSurface ModificationSurface TreatmentWater AbsorptionWater Injection
ISSN
0925-4005
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.
URI
http://hdl.handle.net/20.500.11750/2208
DOI
10.1016/j.snb.2016.03.148
Publisher
Elsevier
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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