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Issue 6, 2013

Ultrasound-induced formation of high and low viscoelastic nanostructures of micelles

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Abstract

We report on the unprecedented ultrasound-driven engineering of typical wormlike micelles to well-aligned, much higher viscoelastic threadlike micelles and lower viscoelastic tubular micelles that have potential practical applications in medicine and oilfield industries. The sonication of the CTAB/salicylate micelle system at 211 kHz in aqueous solutions generated two nanostructures with specific but contradicting properties: stably aligned threadlike micelles of ∼2 nm in diameter and several μm in length with a high viscoelasticity and low viscoelastic tubular micelles of ∼30 nm in diameter and a few hundred nanometres in length. The tubular micelles are relatively unstable structures formed by the coalescence of vesicular intermediates generated during sonication. Acoustic cavitation-generated physical effects are primarily responsible for the generation of these novel nanostructures. This study also provides the first ever experimental evidence in support of a well-known theoretical model that was proposed in the 1990s on the structural transformation of micelles.

Graphical abstract: Ultrasound-induced formation of high and low viscoelastic nanostructures of micelles

Supplementary files

Article information


Submitted
20 Oct 2012
Accepted
05 Dec 2012
First published
02 Jan 2013

Soft Matter, 2013,9, 1997-2002
Article type
Paper

Ultrasound-induced formation of high and low viscoelastic nanostructures of micelles

N. S. M. Yusof and M. Ashokkumar, Soft Matter, 2013, 9, 1997 DOI: 10.1039/C2SM27423J

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