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1588676 
Journal Article 
Room temperature synthesis of titanium dioxide nanoparticles of different phases in water in oil microemulsion 
Keswani, RK; Ghodke, H; Sarkar, D; Khilar, KC; Srinivasa, RS 
2010 
Yes 
Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757 
369 
1-3 
75-81 
WOS:000283395600010 
We report the synthesis of crystalline titanium dioxide
nanoparticles of two different phases (rutile and anomalous pseudobrookite) at room temperature
by a novel microemulsion technique. In this method, one of the reactants (titanium tetrachloride)
is dissolved in the continuous organic phase, whereas the second reactant (ammonium hydroxide) is
added as an aqueous solution. The site of the reaction has been controlled by using two different
addition methods for the second reactant. The size and the crystalline phase of the titanium
dioxide nanoparticles varied according to the site of the reaction between the two reactants.
Reaction in the aqueous core gives rutile titanium dioxide nanoparticles having an average size
of 4.2 nm verified by X-ray diffraction and FTIR. The reaction in the organic phase gives rise to
crystalline anomalous pseudobrookite titanium dioxide nanoparticles of much larger size (10-40
nm). This anomalous pseudobrookite structure is thermally unstable and converts to rutile on high
temperature treatment. (C) 2010 Elsevier B.V. All rights reserved. 
Rutile; Pseudobrookite; Nanoparticles; Microemulsion; Titanium dioxide