Method development for the determination of surface zeta potential of silver coated nylon substrates
- WCU Author/Contributor (non-WCU co-authors, if there are any, appear on document)
- Jace Brennan Walk (Creator)
- Institution
- Western Carolina University (WCU )
- Web Site: http://library.wcu.edu/
- Advisor
- Rangika S. Hikkaduwa Koralege
Abstract: Surface zeta potential (SZP) is an electro kinetic property of surfaces that is a result of the electrical double layer (EDL) that forms when a surface possessing a surface charge is dispersed in a bulk material.1 The EDL is made up of the stern layer containing tightly packed ions of the opposite charge of the surface, that extends from the surface to the diffuse layer, and the diffuse layer which contains ions of mixed charge that extends from the end of the stern layer to the slipping plane.The slipping plane is the interface between the particle or surface and the dispersant, the potential at this interface is the zeta potential (ZP).1 The goal of this project is to develop a method for measuring the surface zeta potential of silver coated nylon substrates. The effects of the measurement process on the surfaces were investigated and the SZP was measured at pH 5, 7 and 9.2 to see how varying pH affects SZP measurements. The measurement process was found to cause a rearrangement of the silver surface, although the mechanism of this rearrangement was not investigated. The method using in this project in combination with the dip cell arrangement purposed by Corbett, et al., resulted in quantifiable data for the determination of the SZP of silver coated nylon substrates under standard conditions using the tracer suspension provided by Malvern and at pH 5, 7 and 9.2 using a silica tracer suspension. There are still more ways in which this method can be expanded upon, but this project has set the foundation in place to move forward with the measurement of the SZP of sliver coated nylon substrates. Hopefully this foundation will lead to better understanding of SZP of silver coated nylon substrates and with it a better understanding of how things interact with the surface. This understanding would allow for the optimization of surface chemistry interactions, such as the interaction of human bodily fluid with the silver coated nylon evidence swabs being developed by the Evanoff research group for the one-step, non-destructive Surface-enhanced Raman spectroscopy (SERS) analysis of human bodily fluids found in sexual assault cases.
Method development for the determination of surface zeta potential of silver coated nylon substrates
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Created on 11/1/2021
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Additional Information
- Publication
- Thesis
- Language: English
- Date: 2021
- Subjects
- Nylon
- Zeta potential -- Measurement
- Surface chemistry