Effect of residual chemicals on wormlike micelles assembled from a C22-tailed cationic surfactant
| Autor: | Xinjie Luo, Yujun Feng, Ji Wang, Zonglin Chu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Drop (liquid) Iodide Cationic polymerization 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Micelle 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Surface tension chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering Pulmonary surfactant Rheology Acetone 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 553:91-98 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2019.06.005 |
| Popis: | Hypothesis Ultra-long-chain surfactants, particularly C22-tailed ones, have attracted considerable attention because of their ease of self-assembly into wormlike micelles (WLMs). Commercial C22-tailed surfactants often contain non-negligible amounts of chemical residues introduced during their production. Since the noncovalent driving force of wormlike self-assembly can be greatly affected by the composition, we hypothesized that the residual chemicals could play a significant role in tuning the micelle microstructure and macroscopic properties of the surfactants. Experiments To confirm this hypothesis, a highly pure (>99%) C22-tailed cationic surfactant, N-erucylamidopropyl-N,N,N-trimethylammonium iodide (EDAI) was synthesized, and various amounts of corresponding reactants (iodomethane or N-erucamidopropyl-N,N-dimethylamine) or solvents (acetone) commonly used in surfactant synthesis were introduced as residues. The impact of each individual residue on the macroscopic appearances, rheological properties, and micelle morphology of the surfactant solution were investigated. Findings Increasing the residue fraction in the EDAI solution resulted in an initial increase, followed by a dramatic drop in solution viscosity. This behavior was described in terms of micellar structural transformations based on analysis of cryo-TEM observations and surface tension measurements. These findings are of crucial importance in understanding the sophisticated behaviors of WLMs and will benefit the industrial preparation of ultra-long-chain surfactants for commercial use. |
| Databáze: | OpenAIRE |
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