Journal
SOFT MATTER
Volume 15, Issue 15, Pages 3160-3167Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sm00088g
Keywords
-
Categories
Funding
- National Natural Science Foundation of China [51774309]
- Shandong Provincial Natural Science Foundation [ZR2017LEE001]
- Key Research and Development Plan of Shandong Province [2018GGX102010]
- Fundamental Research Funds for the Central Universities [18CX02166A]
- Graduate School Innovation Program of China University of Petroleum [YCX2018009]
Ask authors/readers for more resources
A worm-like micelle (WLM) system can be obtained by mixing long-chain cationic surfactants and polybasic organic acids in an aqueous solution. However, the effect of different organic acid structures on the rheological behavior of WLM systems has not been researched. Herein, a novel pH-responsive wormlike micelle system (EATA) was constructed by the complexation of N-erucamidopropyl-N,N-dimethylamine (UC(22)AMPM) and benzene tricarboxylic acid (TA) at a molar ratio of 3:1. UC(22)AMPM/citric acid (EACA) was also prepared to perform a comparison. The rheological behavior, aggregate transformation and thickening mechanism of EATA solutions were investigated by using rheological measurements, cryo-TEM, DLS, surface tension and H-1 NMR. The results show that, at low pH, spherical micelles were formed and the EATA solution exhibited a lower viscosity than the EACA system due to the strong hydrophobicity of the phenyl groups of TA molecules, but the viscosity reaches 10(6) mP s at pH 4.80. Because of the lower pK(a) value of TA than CA, the viscosity of the EATA system drops sharply with the appearance of precipitates caused by the isoelectric point when the pH is greater than 4.80. In addition, by circularly changing the pH value several times, the wormlike micelles could maintain their original viscoelasticity without being weakened in the slightest.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available