The Driving Force for the Association of Gemini Surfactants
| Autor: | Kyeong-jun Jeong, Arun Yethiraj |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Liquid crystalline technology industry and agriculture 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrostatics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound Sulfonate Pulmonary surfactant Chemical physics Critical micelle concentration Lyotropic Materials Chemistry Organic chemistry lipids (amino acids peptides and proteins) Carboxylate Physical and Theoretical Chemistry Potential of mean force 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry B. 122:3259-3265 |
| ISSN: | 1520-5207 1520-6106 |
| Popis: | The self-assembly of surfactants into lyotropic liquid crystalline phases is interesting from a fundamental and practical perspective. The propensity for self-assembly is particularly interesting in Gemini surfactants which have a very low critical micelle concentration. In this work, we study the effect of headgroup identity on the driving force for the self-assembly of Gemini surfactants, using computer simulations of the potential of mean force (PMF). We find that surfactants with sulfonate headgroups have a greater tendency to assemble than those with carboxylate headgroups. The minimum in the PMF is about a factor of 2 deeper and occurs at shorter distances. Interestingly, the driving force is entropic with the carobxylate and energetic with the sulfonate headgroups. Analysis of different contributions suggests that these differences arise from surfactant headgroup electrostatics and size. The results provide an explanation for why the morphology diagram of the sulfonate surfactants is insensitive to temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|