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Kung, H.J., Kung, L. andGardiner, A. (2012) Comparing Top-Down with Bottom-Up Approaches: Teaching Data Modeling. EDSIG Information Systems Educators. Proceedings of the Information Systems Educators Conference, New Orleans, Vol. 29, No. 1910.

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• TITLE: Synthesis, Characterization and Photocatalytic Application of Different Sizes of Gold Nanoparticles on 4-Nitrophenol

  AUTHORS: R. Seoudi, F. A. Al-Marhaby

  KEYWORDS: Gold Nanoparticles, Surface Plasmon Band, Photocatalyst, Rate Constant

  JOURNAL NAME: World Journal of Nano Science and Engineering, Vol.6 No.3, September 23, 2016

  ABSTRACT: In this work, different sizes of gold nanoparticles were synthesized at room temperature by using trisodium citrate as a surfactant stabilizing agent and sodium borohydride as a reducing agent. Transmission Electron Microscopy (TEM) confirmed that the samples were synthesized in spherical shapes with three different particle sizes: 4 nm, 7 nm and 11 nm. Ultraviolet-visible spectra measurements were used to analyze the way that surface plasmon bands were affected by the different particles sizes. The effect of sphere size on photocatalytic reduction of 4-Nitrophenol was then studied and the rate constant of the reduction was calculated to be 0.014 s-1, 0.0091 s-1 and 0.003 s-1 for particles sizes of 4 nm, 7 nm and 11 nm, respectively. The results obtained indicated that small particles were more active in catalytic reduction due to their high surface energy.