# Siam Physics Congress 2015

20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## A Study of Capacitively Coupled Contactless Conductivity Detection (C$^4$D) Electrode Configurations on Signal Detection Sensitivity

21 May 2015, 08:00
3h
Board: INS-06
Poster presentation Instrumentation, Metrology and Standards

### Speaker

Mr Korkuson Masean (Department of Physics and Materials Science, Faculty of science,Chiang Mai University, Chiang Mai, 50200, Thailand)

### Description

Capacitively Coupled Contactless Conductivity Detection (C$^4$D) technique has been widely used in detecting particles of interest in microfluidics applications. In this technique, change of solution conductivity is detected when particles in solution flow pass electrodes. Detection sensitivity depends on electrodes and microfluidic channel configuration. Influenced electrode geometries include electrode dimensions, detection area, and thickness of the wall separating electrodes and the channel. Various sizes and shapes of C$^4$D electrodes fabricated using printed circuit board patterning technique and arrangements between electrodes and channel were used in determining detection sensitivity when particular particles in solution pass through. The sizes of the electrodes fabricated for this study were 50, 90, and 150 microns. The C$^4$D electrodes were tested with the various oil droplet sizes in water. It was found that the electrodes could be used to detect the oil droplets of size down to about 100 microns.

### Primary author

Mr Korkuson Masean (Department of Physics and Materials Science, Faculty of science,Chiang Mai University, Chiang Mai, 50200, Thailand)

### Co-authors

Ms Jongrak Sanglao (Department of Physics and Materials Science, Faculty of science,Chiang Mai University, Chiang Mai, 50200, Thailand) Dr Nirut Pussadee (Plasma and Beam Physics Research Facility, Department of Physics and Materials Science, Faculty of science ,Chiang Mai University, Chiang Mai, 50200, Thailand)

### Presentation Materials

There are no materials yet.