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Worm-like micelles as templates: Formation of anisotropic silver halide nanoparticles

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Title Worm-like micelles as templates: Formation of anisotropic silver halide nanoparticles
 
Creator GUPTA, VKN
MEHRA, A
THAOKAR, R
 
Subject CTAB
CTAC
NaSal
Surfactant system
Worm-like micelle
MESOPOROUS SILICA NANOPARTICLES
AGBR NANOPARTICLES
GOLD NANORODS
SURFACTANT COUNTERION
SODIUM-SALICYLATE
BROMIDE COMPLEX
PARTICLE-SIZE
MICROEMULSIONS
NANOCRYSTALS
PHOTOCATALYST
 
Description A novel method is suggested for the formation of anisotropic silver halide nanoparticles by the direct reaction of silver nitrate (AgNO3) with cetyl trimethyl ammonium bromide (CTAB)/chloride (CTAC) and sodium salicylate (NaSal) using worm-like micelles in aqueous solution. It is observed that the presence of a worm-like micellar phase is critical to the formation of anisotropic nanoparticles. Spherical nanoparticles are otherwise obtained when NaSal is absent or below the critical concentration required for the micellar phase. Direct addition of AgNO3 to the surfactant system leads to formation of spherical nanoparticles at short times, which then possibly coagulate and consolidate on a surfactant backbone to form nanorods. Interestingly, when pre-formed spherical nanoparticles are added to a worm-like micellar system, nanorods similar to the proposed method are observed. This technique can possibly be used to synthesize anisotropic nanoparticles of even those materials which do not have an inherent tendency (crystal habit) to form anisotropic structures. (C) 2011 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-16T13:07:18Z
2014-10-16T13:07:18Z
2012
 
Type Article
 
Identifier COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 39373-80
http://dx.doi.org/10.1016/j.colsurfa.2011.11.003
http://dspace.library.iitb.ac.in/jspui/handle/100/15624
 
Language en