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Issue 6, 2013
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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

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Publication details

The article was received on 20 Oct 2012, accepted on 05 Dec 2012 and first published on 02 Jan 2013


Article type: Paper
DOI: 10.1039/C2SM27423J
Citation: Soft Matter, 2013,9, 1997-2002
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    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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