Journal
LAB ON A CHIP
Volume 11, Issue 2, Pages 348-353Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0lc00015a
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Funding
- National Research Foundation (NRF) [2010-0020772, 2006-005-J04002, M10536090002-05N3609-00210]
- Advanced Institutes of Convergence Technology (AICT) in Korea
- BK21 program
- Seoul RBD Program
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This study describes a simple and low cost method for fabricating enclosed transparent hydrophilic nanochannels by coating low-viscosity PDMS (monoglycidyl ether-terminated polydimethylsiloxane) as an adhesion layer onto the surface of the nanotrenches that are molded with a urethane-based UV-curable polymer, Norland Optical Adhesive (NOA 63). In detail, the nanotrenches made of NOA 63 were replicated from a Si master mold and coated with 6 nm thick layer of PDMS. These nanotrenches underwent an oxygen plasma treatment and finally were bound to a cover glass by chemical bonding between silanol and hydroxyl groups. Hydrophobic recovery that is observed in the bulk PDMS was not observed in the thin film of PDMS on the mold and the PDMS-coated nanochannel maintained its surface hydrophilicity for at least one month. The potentials of the nanochannels for bioapplications were demonstrated by stretching lambda-DNA (48,502 bp) in the channels. Therefore, this fabrication approach provides a practical solution for the simple fabrication of the nanochannels for bioapplications.
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