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Issue 4, 2018
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Annular and threadlike wormlike micelles formed by a bio-based surfactant containing an extremely large hydrophobic group

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Abstract

A novel bio-based anionic surfactant containing a large rigid group and a flexible alkyl chain, namely, sodium N-dodecyl-maleimidepimaric carboxylate (C12-MPA-Na), was synthesized from rosin. The molecular structure of C12-MPA-Na was identified using 1H NMR, FT-IR spectroscopy and MS. Despite containing 36 carbon atoms, C12-MPA-Na showed good water solubility at room temperature. Large spherical aggregates with diameters of 100–200 nm were formed by C12-MPA-Na when its concentration was above 0.1 mM, which was slightly higher than the critical micelle concentration (0.078 mM). Annular wormlike micelles were discovered with increasing C12-MPA-Na concentration, and began to change into extremely long threadlike wormlike micelles when the C12-MPA-Na concentration reached approximately 58 mM. The viscoelastic properties of the wormlike micelle solutions were investigated using steady state and oscillatory shear sweep rheological measurements. The zero-shear viscosity (η0) strongly depended on the concentration of C12-MPA-Na, and the scaling exponent was 34.1. Cryo-TEM confirmed the formation of large spherical aggregates and wormlike micelles. 1H–1H 2D nuclear Overhauser effect spectroscopy (NOESY) was used to detect the molecular interactions of C12-MPA-Na. The results indicated that the alkyl chain of C12-MPA-Na was partially overlapped with its non-planar rigid structure in aqueous solution, and the possible aggregation process for C12-MPA-Na was proposed.

Graphical abstract: Annular and threadlike wormlike micelles formed by a bio-based surfactant containing an extremely large hydrophobic group

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Publication details

The article was received on 03 Nov 2017, accepted on 17 Dec 2017 and first published on 18 Dec 2017


Article type: Paper
DOI: 10.1039/C7SM02163A
Citation: Soft Matter, 2018,14, 499-507
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    Annular and threadlike wormlike micelles formed by a bio-based surfactant containing an extremely large hydrophobic group

    Z. Zhai, X. Yan, Z. Song, S. Shang and X. Rao, Soft Matter, 2018, 14, 499
    DOI: 10.1039/C7SM02163A

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