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

Soft Matter
Zhaolan ZhaiXiaoping Rao

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 ...Continue Reading

References

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Citations

Sep 27, 2018·Chemical Communications : Chem Comm·Zhaolan ZhaiXiaoping Rao
May 1, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Szymon KuglerEwa Wierzbicka
Aug 20, 2020·Journal of Agricultural and Food Chemistry·Zhaolan ZhaiJie Song
Sep 27, 2018·Journal of Agricultural and Food Chemistry·Xinyan YanXiaoping Rao
Sep 25, 2021·Applied Microbiology and Biotechnology·Tengfei WangYi Jiang

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Methods Mentioned

BETA
column chromatography
NMR
rheology

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