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  Global Journal of Environmental Science and Technology 2012, 2: 16
  Research Article
Surface chemistry and dispersion property of titanium dioxide nanoparticles in water suspension
  Y. H. Teow, A. L. Ahmad, B. S. Ooi  
School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Penang, Malaysia
  Titanium dioxide (TiO2) nanoparticles (NPs) have attracted great research interests in improving the membrane permeability, fouling-resistance and self-cleaning properties. For application feasibility, the TiO2 NPs should exist in preferable small aggregate size and should be uniformly dispersed in the polymer film as mixed matrix membrane. The aim of this study is to investigate the effect of pH and ultrasonic irradiation time on the surface chemistry and the dispersibility of TiO2 NPs. The results showed that for pH < 4.0, a stable PC-20 TiO2 NPs suspension could be produced with zeta potential > 30 mV, while for P25 TiO2 NPs, better dispersibility with broader pH range (< pH 5.0) can be observed. Besides, ultrasonic irradation time is found to contribute its effect on size distribution of TiO2 NPs in water suspension. The mean size of TiO2 NPs in water suspension decreased for longer ultrasonic irradiation time.
  Ultrasonication; Zeta potential; TiO2 nanoparticles; Water suspension  

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