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Characterization of water/AOT/benzene microemulsions during photoreduction to produce silver particles
- Source :
-
Journal of Colloid & Interface Science . Mar2010, Vol. 343 Issue 2, p423-432. 10p. - Publication Year :
- 2010
-
Abstract
- Abstract: Colloidal dispersions of silver (Ag) particles were prepared by the photoreduction of silver perchlorate (AgClO4) in water/AOT/benzene water-in-oil (w/o) microemulsions consisting of sodium bis(2-ethylhexyl) sulfosuccinate (AOT), water and benzene. Formation mechanisms of Ag particles prepared in the presence of benzoin by photoreduction from Ag+-containing w/o microemulsions were investigated by UV–vis, transmission electron microscopy (TEM), extended X-ray absorption fine structure (EXAFS) and small-angle X-ray scattering (SAXS) measurements. By a combination of TEM and EXAFS results, Ag particles show a metallic nature after the photoreduction and the diameter of Ag particles ranges between 5 and 30nm. In situ time-resolved SAXS measurements show that the integrated rate equation can be applied in the reduction process of Ag+ ions to Ag0 atoms, and the autocatalytic Ag particle growth proceeds in the association process of Ag0 atoms during the photoreduction of Ag+-containing w/o microemulsions. The nanometer-sized water droplets microemulsified by AOT in benzene continuous-phase regulated the size of Ag particles, and the size and shape of water droplets were retained during the Ag particle formation. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 343
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 47959154
- Full Text :
- https://doi.org/10.1016/j.jcis.2009.12.006