Fabrication of microchannel with 60 electrodes and resistance measurement

Application of tomography in microreactors

“…In addition, we also investigated the sorting of embryonic stem (ES) cells using dielectrophoresis and electro-osmosis (Choi, Takei, & Doh, 2010). From that, we were able to separate a group of small-cell and large-cell populations from large populations of mixed cells.…”

“…In the case of 12 electrodes, the total number of electrode pairs in the capacitance measurement, n, is 66 pairs. Figure 24.11 shows an example of the experimental results of the reconstruction image of particle concentration distribution at three vertical cross sections in the microchannel (Choi et al, 2010). In our latest research, ECT is applied for 3D particle concentration, monitoring, and particle or cell manipulation using a dielectrophoresis technique.…”

Two-phase Flow Visualization Employing Gauss-Newton Method in Microchannel

“…Research on field of microfluidics was motivated because of the availability of fabricating complicated sensing configuration on micro scales using Micro-Electro-Mechanical Systems (MEMS) technology in recent years [1]. A number of investigations have been partially discussed according to modelling simulation [2,3], flow pattern analysis [4], flow engineering and applications: heat transfer [5], micro reactor [6] and DNA analysis [7], however, a clear understanding of the micro-scale effects on multiphase flow is still rudimentary, one of the reasons is surely a lack of experimental techniques which allow for electrical parameter measurement in very limited space.…”

Cross-sectional of capacitance measurement in-transition of particle concentration in microchannel system

“…In addition, microchannel also gives an opportunity to monitor dynamic processes of particles in a vertical cross-section. One of the authors, Choi et al [1] had fabricated a microchannel system with five cross-sections and each cross-section had embedding with 12 electrodes. Choi et al [1] investigated a three dimensional (3D) visualization of particles volume fraction of each cross-section in the microchannel by using an electrical resistance tomography sensing (ERT).…”

“…One of the authors, Choi et al [1] had fabricated a microchannel system with five cross-sections and each cross-section had embedding with 12 electrodes. Choi et al [1] investigated a three dimensional (3D) visualization of particles volume fraction of each cross-section in the microchannel by using an electrical resistance tomography sensing (ERT). The transition of particles concentration distribution is occurring in microchannel due to a migration of particle in a fluid flowing which affected by inertial lift force that experience by the particles.…”