Experimental investigation of temperature effects on zeta potential in microchannels

Zeta potential is a property of material surface charge when it is surrounded by fluid. The study of Zeta potential has significant meaning in chemical industry since it affects process control, quality control, and product specification. This project presents an investigation on temperature effect...

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Main Author: Xiao, Hui
Other Authors: Huang Xiaoyang
Format: Final Year Project
Language:English
Published: 2014
Subjects:
Online Access:http://hdl.handle.net/10356/61948
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-619482023-03-04T18:32:54Z Experimental investigation of temperature effects on zeta potential in microchannels Xiao, Hui Huang Xiaoyang School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics Zeta potential is a property of material surface charge when it is surrounded by fluid. The study of Zeta potential has significant meaning in chemical industry since it affects process control, quality control, and product specification. This project presents an investigation on temperature effect on Zeta potential for PDMS microchannels. The Time-interval current-monitoring method is adopted to measure the electro-osmotic flow (EOF) velocity U at evaluated temperature. The Smoluchowski’s equation for EOF velocity is used to predict Zeta potential (ζ). The applied electrical field as well as the solution is selected so that joule heating or electrolysis is negligible. The heat effect of Indium tin oxide (ITO) film is utilized to achieve a temperature range for the microchannel. To enrich the objective, the microchannels surfaces are modified to achieve different solid-liquid contact fraction; consequently the influence of surface hydrophobicity on Zeta potential is investigated. It is found that, when NaCl solution is filled in a PDMS microchannel, the Zeta potential can exhibit a dependence on temperature, the magnitude of Zeta potential increases with temperature. Meanwhile, the PDMS surface with higher solid-liquid contact fraction leads to a higher Zeta potential. Bachelor of Engineering (Mechanical Engineering) 2014-12-12T02:49:10Z 2014-12-12T02:49:10Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/61948 en Nanyang Technological University 91 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Fluid mechanics
spellingShingle DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Xiao, Hui
Experimental investigation of temperature effects on zeta potential in microchannels
description Zeta potential is a property of material surface charge when it is surrounded by fluid. The study of Zeta potential has significant meaning in chemical industry since it affects process control, quality control, and product specification. This project presents an investigation on temperature effect on Zeta potential for PDMS microchannels. The Time-interval current-monitoring method is adopted to measure the electro-osmotic flow (EOF) velocity U at evaluated temperature. The Smoluchowski’s equation for EOF velocity is used to predict Zeta potential (ζ). The applied electrical field as well as the solution is selected so that joule heating or electrolysis is negligible. The heat effect of Indium tin oxide (ITO) film is utilized to achieve a temperature range for the microchannel. To enrich the objective, the microchannels surfaces are modified to achieve different solid-liquid contact fraction; consequently the influence of surface hydrophobicity on Zeta potential is investigated. It is found that, when NaCl solution is filled in a PDMS microchannel, the Zeta potential can exhibit a dependence on temperature, the magnitude of Zeta potential increases with temperature. Meanwhile, the PDMS surface with higher solid-liquid contact fraction leads to a higher Zeta potential.
author2 Huang Xiaoyang
author_facet Huang Xiaoyang
Xiao, Hui
format Final Year Project
author Xiao, Hui
author_sort Xiao, Hui
title Experimental investigation of temperature effects on zeta potential in microchannels
title_short Experimental investigation of temperature effects on zeta potential in microchannels
title_full Experimental investigation of temperature effects on zeta potential in microchannels
title_fullStr Experimental investigation of temperature effects on zeta potential in microchannels
title_full_unstemmed Experimental investigation of temperature effects on zeta potential in microchannels
title_sort experimental investigation of temperature effects on zeta potential in microchannels
publishDate 2014
url http://hdl.handle.net/10356/61948
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