Journal
SOFT MATTER
Volume 14, Issue 22, Pages -Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sm00467f
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Funding
- Shandong Provincial Natural Science Foundation [ZR2017LEE001]
- Fundamental Research Funds for the Central Universities [18CX02166A, 15CX08003A]
- Special Support for Post-doctoral Creative Funding in Shandong Province [201702026]
- National Science and Technology Major Projects [2017ZX05009-004]
- National Natural Science Foundation of China [51774309]
- China Postdoctoral Science Foundation [2017M612378]
- Qingdao Postdoctoral Application Research Project [2016222]
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Responsive wormlike micelles (WLMs) constructed by different carboxylic acids are fascinating. However, it is unknown how the position of the carboxylic groups alters the stimuli-response of wormlike micellar systems. Herein, three pH-responsive WLMs based on Gemini-like surfactants (named o-EAPA, m-EAPA, and p-EAPA) were formed and studied through the complexation of N-erucamidopropyl-N,N-dimethylamine (UC(22)AMPM) and o-phthalic acid (o-PA), m-phthalic acid (m-PA), or p-phthalic acid (p-PA) at the molar ratio of 2:1. The viscoelasticity, phase behavior and aggregate microstructure were separately explored by rheological, appearance observation and cryo-TEM methods. The results show that all phthalic acids can protonate UC(22)AMPM, thereby forming WLMs. However, with the shorter spacer distance between two carboxyl groups in phthalic acid, o-EAPA exhibits the longer length scale of aggregates and a more efficient thickening ability compared to the other two systems. Similar results in the N,N-dimethyl oleoaminde-propylamine (DOAPA) and o-PA, m-PA, and p-PA systems further verify the applicability of this mechanism. Furthermore, the phthalic acid based WLMs are found to exhibit intriguing reversible pH-responsive behaviors, which include promptly switching between a high elastic system and a low viscosity fluid by pH control. The o-EAPA system possesses a larger viscosity maximum, which produces more precipitous viscosity changes as the pH varies. This study is beneficial for the formation of pH-responsive WLMs and to determine their advantages for applications.
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