Issue 116, 2015

Amphiphilic short peptide modulated wormlike micelle formation with pH and metal ion dual-responsive properties

Abstract

Amphiphilic short peptides (ASPs) and surfactants (C14DMAO) were employed to prepare wormlike micelles. Herein, ASPs were used to induce wormlike micelle formation. The formation mechanism was investigated by cryo-TEM, FTIR, CD and a rheometer. C14DMAO could be protonated by a proton which was dissociated from the carboxyl headgroups of ASPs. The mean area of the headgroup would be reduced due to the interaction of protonated cationic surfactants and dissociated anionic ASPs which would lead to wormlike micelle formation. And the length of the wormlike micelles could be modulated by the size of the hydrophobic part of ASPs. The wormlike micelles could also respond to pH and metal ions, respectively. When the pH was regulated from 5.96 to 3.23, the wormlike micelles transformed into a nanofiber network. Nevertheless, when the pH was regulated to over 9, spherical micelles would be formed and the solution would lose its viscoelasticity. When a certain amount of metal salts were added into the wormlike micelle solution with a pH of 5.96, the viscosity of the solution increased significantly. The coordination interaction between metal ions and C14DMAO was considered as the responsive mechanism. Metal ions with high valence have more obvious effects on wormlike micelles.

Graphical abstract: Amphiphilic short peptide modulated wormlike micelle formation with pH and metal ion dual-responsive properties

Article information

Article type
Paper
Submitted
09 Sep 2015
Accepted
30 Oct 2015
First published
02 Nov 2015

RSC Adv., 2015,5, 95604-95612

Author version available

Amphiphilic short peptide modulated wormlike micelle formation with pH and metal ion dual-responsive properties

D. Wang, Y. Sun, M. Cao, J. Wang and J. Hao, RSC Adv., 2015, 5, 95604 DOI: 10.1039/C5RA18441J

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