Hits:

Indexed by:期刊论文

Date of Publication:2008-11-21

Journal:JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:208

Issue:1-3

Page Number:63-69

ISSN No.:0924-0136

Key Words:COP (cyclo-olefin polymer) microfluidic chip; Hot embossing; Variable temperature quasi-creep experiment; DNA separation

Abstract:Hot embossing method was studied for the fabrication of microfluidic microchannels on COP (cyclo-olefin polymer) chip. The ending temperature of heating stage, i.e. embossing reference temperature (T-r), was determined by the viscoelastic property of the COP, according to variable temperature quasi-creep experiments. Taguchi method was used to decide the processing parameters in cooling and demolding stage. The optimized parameters of hot embossing are: embossing reference temperature 143 degrees C, temperature and pressure holding time 2 min, pressure at cooling and demolding stage 1.6 MPa, the demolding temperature in the lower heating plate 80 degrees C and temperature difference between the upper and lower heating plate 10 degrees C. Experiment shows that microchannel fabricated with the above parameters has high repeatability and low substrate deformation, average repeatability is 97.6% in width and 94.3% in depth. Experiments on background fluorescence, electrophoresis, and DNA separation and detection were carried out on COP and PMMA (polymethylmethacrylate) chips, respectively. Compared to the PMMA chip, the COP chip has higher signal to noise ratio, higher electrophoresis efficiency, and lower peak area relative standard deviation (R.S.D.). In separation 6 mu g/ml phi X174 RF DNA Hinc II, 11 DNA fragments have been identified in less than 2 min on the COP chip, thus it has large application potential in biochemical analysis. (C) 2008 Elsevier B.V. All rights reserved.