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Issue 40, 2017
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The N-allyl substituted effect on wormlike micelles and salt tolerance of a C22-tailed cationic surfactant

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Abstract

Wormlike micelles (WLMs) have been observed in a wide variety of cationic surfactants. Here we developed WLMs based on an N-allyl substituted cationic surfactant with an unsaturated C22-tail, N-erucamidopropyl-N,N-dimethyl-N-allyl-ammonium bromide (EDAA), and compared them with UC22AMPM at the same concentration. The viscoelasticity, aggregate microstructure and salt tolerance of EDAA solutions were investigated by rheology, surface tension and Cryo-TEM measurements. It was found that EDAA exhibited a higher viscosity and a high salt tolerance. Upon increasing the concentration of NaCl, the viscosity of wormlike micelles in the solutions continuously increased and reached ∼1.10 × 106 mP s at 200 mM. On further increasing the NaCl concentration to 2000 mM, the viscosity remained at ∼106 mP s without any reduction. But the viscosity of UC22AMPM solutions showed a drastic change with the increase of NaCl concentration. This drastic variation in rheological behavior is attributed to the presence of the N-allyl substituent. Besides, the EDAA also shows some advantages such as low overlapping concentration(∼2.2 mM) and stable viscosity over the whole pH range.

Graphical abstract: The N-allyl substituted effect on wormlike micelles and salt tolerance of a C22-tailed cationic surfactant

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Publication details

The article was received on 04 Jul 2017, accepted on 09 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7SM01322A
Citation: Soft Matter, 2017,13, 7425-7432
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    The N-allyl substituted effect on wormlike micelles and salt tolerance of a C22-tailed cationic surfactant

    P. Wang, W. Kang, H. Yang, Y. Zhao, X. Yin, Z. Zhu and X. Zhang, Soft Matter, 2017, 13, 7425
    DOI: 10.1039/C7SM01322A

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