Hydrophobic terminal group of surfactant initiating micellization as revealed by 1 H NMR spectroscopy
| Autor: | You-Ru Du, Shizhen Mao, Maili Liu, Xiao-ying Chen, Gang-Jin Yu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Ammonium bromide Chemistry Chemical shift Thermodynamics of micellization Inorganic chemistry Cationic polymerization 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Medicinal chemistry 0104 chemical sciences chemistry.chemical_compound Pulmonary surfactant Molecule Sodium dodecyl sulfate 0210 nano-technology Alkyl |
| Zdroj: | Chinese Chemical Letters. 28:1413-1416 |
| ISSN: | 1001-8417 |
| Popis: | The critical aggregation concentration (CAC) of four with three kinds of conventional surfactants, namely, two cationic surfactants [hexadecyltrimethyl ammonium bromide (CTAB) and tetradecyltrimethyl ammonium bromide (TTAB)], one anionic surfactant [sodium dodecyl sulfate (SDS)], and a nonionic surfactant [Triton X-100 (TX-100)], were determined by variation of 1 H chemical shifts with surfactant concentrations. Results show that the CAC values of protons at different positions of the same molecule are different, and those of the terminal methyl protons are the lowest, respectively, which suggests that the terminal groups of the alkyl chains aggregates first during micellization. Measurement of the transverse relaxation time (T 2 ) of different protons in SDS also show that the terminal methyl protons start to decrease with the increase in concentration first, which supports the above mentioned tendency. |
| Databáze: | OpenAIRE |
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