The adsorption and aggregation properties of dendritic cationic tetrameric surfactants
| Autor: | Yangchun Xie, Guangmiao Qu, Tong Sun, Jie Li, Yipeng Wang, Zuofeng Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution General Chemical Engineering Cationic polymerization 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Monomer Adsorption Chemical engineering chemistry Dynamic light scattering Electrical resistivity and conductivity 0210 nano-technology Alkyl Wilhelmy plate |
| Zdroj: | RSC advances. 8(63) |
| ISSN: | 2046-2069 |
| Popis: | A series of dendritic cationic tetrameric surfactants (4CntetraQ, n = 12, 14, 16) were synthesized with raw materials that are commercially available. The adsorption and aggregation properties of the synthesized surfactants were studied using the Wilhelmy plate method, electrical conductivity, fluorescence spectra and dynamic light scattering techniques, and surface chemical parameters and thermodynamics parameters were obtained, respectively. These surfactants have higher surface activities than those of the corresponding monomeric and dimeric surfactants and are more prone to self-assembling in aqueous solution than adsorption at the surface. The thermodynamics parameters reflect that both adsorption and micellization processes of 4CntetraQ are spontaneous, and that the micellization process is entropy-driven. Both adsorption and micellization of 4CntetraQ have a tendency to occur with increasing alkyl chain length or temperature. DLS measurements show that there exist large aggregates at the concentration of 10 times the CMC. |
| Databáze: | OpenAIRE |
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