A Y-channel design for improving zeta potential and surface conductivity measurements using the current monitoring method |
| |
Authors: | Zeyad A. Almutairi Tomasz Glawdel Carolyn L. Ren David A. Johnson |
| |
Affiliation: | (1) Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada |
| |
Abstract: | This study presents a new Y-channel design for measuring the zeta potential and surface conductance of a solid-liquid pairing using the current monitoring technique. The new design improves the throughput and reliability of the testing apparatus since the displacement between two solutions can be repeated many times without interfering with the experiments. It also increases the accuracy of the measurement by producing sharper start and end transitions for the current–time plot of the solution displacement process. In this design, efforts have been made to minimize the effects of electrolysis, Joule heating and undesired pressure driven flow on the measurements. An improvement on the current–time slope analysis is also presented. The Y-channel design was validated by comparing zeta potential measurements to published results. The zeta potential of several biological buffers relevant to the microfluidic community in plasma treated PDMS/PDMS and PDMS/Glass microchannels are presented. Preliminary studies of surface conductivity measurements using the Y-channel design were also conducted and are briefly discussed. |
| |
Keywords: | Zeta potential Current monitoring technique Y-channel design Current slope method PDMS microchannel |
本文献已被 SpringerLink 等数据库收录! |