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Variable‐volume‐injection methods using electrokinetic focusing on microfluidic chips
Author(s) -
Yang RueyJen,
Fu LungMing,
Lee GwoBin
Publication year - 2002
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/1615-9314(20021101)25:15/17<996::aid-jssc996>3.0.co;2-m
Subject(s) - electrokinetic phenomena , microfluidics , spark plug , materials science , nanotechnology , mechanical engineering , engineering
This paper adopts a physical model and a numerical simulation approach to study electrokinetic focusing injection on microfluidic chips. The model reflects the principal material transport mechanisms such as electrokinetic migration, ionic concentration, fluid flow, and diffusion. The current study also involves the design and testing of various injection systems used to deliver a sample plug. A novel double‐cross injection system has been developed which uses electrokinetic focusing to achieve variable‐volume injection of the sample plug. The injection technique uses a unique sequence of loading steps with different electric potential distributions and potential magnitudes within the various channels to effectuate a virtual valve. The proposed design combines several functions of traditional sample plug injection systems on a single microfluidic chip.