Errata: Passive regulation of volume-flow ratio for microfluidic streams with different hydrophilicity and viscosity

BioMEMS Group, Electronics and Telecommunications Research Institute, Daejeon, Korea.
Electrophoresis (Impact Factor: 3.03). 04/2010; 31(8):1431. DOI: 10.1002/elps.201090027
Source: PubMed
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Available from: Sung-Jin Kim, Oct 16, 2014
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    ABSTRACT: A novel three-dimensional (3D) disposable glucose concentration detection chip is presented. The chip comprises a four-layer polymethyl methacrylate (PMMA) structure and is fabricated using a commercial CO2 laser and a hot-press bonding technique. In the proposed device, the glucose solution is injected into a double parallel connection micromixer (DPCM) and is mixed with DNS reagent by means of a self-rotation effect. An experimental platform has been created for multiple reaction process by integrating chip and micro-heater. The fluid streams exiting the two circular mixing chambers of the DPCM are then combined and mixed further at a T-type microchannel outlet before passing to a collection chamber. Numerical simulations are performed to analyze the vortex streamline distribution within the DPCM and to estimate the mixing performance. The numerical results show that a mixing efficiency as high as 92.5% can be obtained at low Reynolds numbers (Re=12). It is found a good linear relation of R 2=0.9953 from the chip detection method comparing to the traditional method of R 2=0.9976 at DNS reagent and glucose solution volume ratio of 1:1. In addition, the experimental results show that the accuracy of the glucose concentration measurements obtained using the proposed microfluidic chip is comparable with that of the measurements obtained using a conventional large-scale detection method. Overall, the results presented in this study indicate that the DPCM chip provides a rapid and low-cost means of detecting the concentration of glucose solutions. KeywordsMicromixer–DNS method–CO2 laser machining–Microfluidics
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