TY - JOUR
T1 - Chemical imaging of the concentration profile of ion diffusion in a microfluidic channel
AU - Miyamoto, Ko Ichiro
AU - Ichimura, Hiroki
AU - Wagner, Torsten
AU - Schöning, Michael J.
AU - Yoshinobu, Tatsuo
N1 - Funding Information:
This study was supported by the Grant-in-Aid for Scientific Research (B) (contract no. 24310098) from the Japan Society for the Promotion of Science (JSPS) . A part of this research was carried out at the Machine Shop Division and the Project Clean Room of Fundamental Technology Center, Research Institute of Electrical Communication, Tohoku University.
PY - 2013
Y1 - 2013
N2 - The chemical imaging sensor is a device to visualize the spatial distribution of chemical species based on the principle of LAPS (light-addressable potentiometric sensor), which is a field-effect chemical sensor based on semiconductor. In this study, the chemical imaging sensor has been applied to investigate the ion profile of laminar flows in a microfluidic channel. The chemical images (pH maps) were collected in a Y-shaped microfluidic channel while injecting HCl and NaCl solutions into two branches. From the chemical images, it was clearly observed that the injected solutions formed laminar flows in the channel. In addition, ion diffusion across the laminar flows was observed, and the diffusion coefficient could be derived by fitting the pH profiles to the Fick's equation.
AB - The chemical imaging sensor is a device to visualize the spatial distribution of chemical species based on the principle of LAPS (light-addressable potentiometric sensor), which is a field-effect chemical sensor based on semiconductor. In this study, the chemical imaging sensor has been applied to investigate the ion profile of laminar flows in a microfluidic channel. The chemical images (pH maps) were collected in a Y-shaped microfluidic channel while injecting HCl and NaCl solutions into two branches. From the chemical images, it was clearly observed that the injected solutions formed laminar flows in the channel. In addition, ion diffusion across the laminar flows was observed, and the diffusion coefficient could be derived by fitting the pH profiles to the Fick's equation.
KW - Chemical imaging sensor
KW - Diffusion coefficient
KW - Laminar flow
KW - Light-addressable potentiometric sensor
KW - Microfluidic channel
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U2 - 10.1016/j.snb.2013.04.057
DO - 10.1016/j.snb.2013.04.057
M3 - Article
AN - SCOPUS:84887094438
SN - 0925-4005
VL - 189
SP - 240
EP - 245
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
ER -