Effects of nonionic surfactant and sodium dodecyl sulfate layers on electroacoustics of hexadecane/water emulsions
| Autor: | R. J. Hunter, Linggen Kong, J. K. Beattie |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Inorganic chemistry Hexadecane Mole fraction chemistry.chemical_compound Colloid and Surface Chemistry Adsorption Hydrocarbon Pulmonary surfactant chemistry Emulsion Materials Chemistry Particle size Physical and Theoretical Chemistry Sodium dodecyl sulfate |
| Zdroj: | Colloid & Polymer Science. 279:678-687 |
| ISSN: | 1435-1536 0303-402X |
| Popis: | Hexadecane-in-water emulsion droplets were formed in a homogeniser in the presence of a mixture of an anionic surfactant (sodium dodecyl sulfate, SDS) and nonionic surfactants of various chain lengths [nonylphenol ethoxylate (C9φEN, N=100, 40 and 30) or an alcohol ethoxylate (Brij35)]. The dynamic mobility of the oil droplets was then measured using a flow-through version of an AcoustoSizer. Large changes were observed in the dynamic mobility of the particles formed with the mixed surfactants compared to particles formed with SDS alone. O'Brien's “gel layer” model was employed to interpret the data. The characteristics of the adsorbed layer appeared to be similar whether the nonionic surfactant was adsorbed concurrently with the SDS as the emulsion formed or was merely added afterwards to the emulsion established. The particle size, the charge and the molar fraction of SDS had virtually no effect. The layers formed with the nonionic surfactants decreased in thickness with decreasing molecular weight as expected. Passage through the homogeniser itself had no effect on the properties of the largest nonionic surfactant and, hence, on the adsorption layer formed with it. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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