Responsive morphology transition from micelles to vesicles based on dynamic covalent surfactants

Soft Matter
Pengxiang WangWanli Kang

Abstract

A dynamic covalent bond is widely used to fabricate stimuli responsive systems due to its reversible molecular recognition properties. In this study, we developed a pH-responsive morphology transition system based on a mixture of a cationic surfactant CTAB and two nonamphiphilic precursors, 4-hydroxybenzaldehyde (HB) and octylamine (OA), at a molar ratio of 100 : 60 : 60 (CTAB/HB/OA). The morphology transition of CTAB/HB/OA was characterized by 1H NMR spectroscopy, Fourier transform infrared spectroscopy, macroscopic appearance observation, dynamic light scattering, and rheological and cryo-TEM measurements. The phase behavior of CTAB/HB/OA solutions underwent transition from a water-like fluid to a transparent gel-like solution and then converted into a turbid low-viscosity solution upon increasing the pH. Upon increasing the pH from 4.93 to 7.99, the morphology was transformed from spherical micelles to wormlike micelles. Upon further increasing the pH to 12.02, the wormlike micelles gradually disappeared with the formation of vesicles. Thus, a morphology transition from micelles to vesicles can be triggered by varying the pH of CTAB/HB/OA solutions. This drastic variation in morphology behavior was attributed to the pH depen...Continue Reading

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Citations

Sep 10, 2020·Chemical Communications : Chem Comm·Sameer DhawanV Haridas
Apr 25, 2021·Journal of Colloid and Interface Science·Yiqian XieJian Xu
Jun 10, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Zhaowei HouLiqiang Zheng

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