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Zeta Potential Studies of Titanium Dioxide and Silver Nanoparticle Composites in Water-Based Colloidal Suspension

[+] Author Affiliations
Assaf Azouri, Ming Ge, Kun Xun, Klaus Sattler, Joe Lichwa, Chittaranjan Ray

University of Hawaii at Manoa, Honolulu, HI

Paper No. MN2006-17072, pp. 221-223; 3 pages
doi:10.1115/MN2006-17072
From:
  • ASME 2006 Multifunctional Nanocomposites International Conference
  • Multifunctional Nanocomposites
  • Honolulu, Hawaii, USA, September 20–22, 2006
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4761-6 | eISBN: 0-7918-3785-8
  • Copyright © 2006 by ASME

abstract

We determine the zeta potential (ZP) by using electrophoretic laser light scattering and Laser Doppler Velocimetry (LDV). Particle sizes are measured by photon correlation spectroscopy (PCS). We studied the ZP for colloidal suspensions of TiO2 and Ag metal particles in order to determine the kinetic interaction and charge exchange between the particles. We investigated the natural tendency of the particles for aggregation and varied the pH of the solution. It was found that the ZP versus pH curve for the mixed TiO2 /Ag did not behave as the average of the individual TiO2 and Ag curves as one would expect, and instead there was a slight horizontal shift towards higher pH values which implies that the particles in the mixed TiO2 /Ag colloid are interacting with the result of charge exchange. The average particle size was measured in terms of effective diameter, for the TiO2 , Ag and the mixed TiO2 /Ag particles. The results indicated an increase of approximately 100 nm in the effective diameter of the mixed TiO2 /Ag particles size compared to the size of the individual TiO2 particles. This can be explained as the fact that 50 nm Ag particles are adsorbed on the surface of the TiO2 particles.

Copyright © 2006 by ASME

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