期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 115, 期 12, 页码 2970-2978出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp200536k
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资金
- German Science Foundation [560398]
- European Research Council [240556]
- European Research Council (ERC) [240556] Funding Source: European Research Council (ERC)
We present sum frequency scattering spectra on kinetically stabilized emulsions consisting of nanoscopic oil droplets in water, stabilized with sodium dodecyl sulfate (SDS). We have measured the interfacial structure of the alkyl chains of the surfactant molecules, the alkyl chain of the oil molecules, the weakly dispersive D2O response, and. the interference between SDS and the oil. We find a big difference in chain conformation: SIDS has many chain defects, whereas the oil has very few. Our spectra are interpreted to originate from a surface structure with oil molecules predominantly oriented parallel with respect to the plane of the interface. The SDS headgroup is surrounded by water molecules. The SDS alkyl tail is in a disordered state and partially in contact with water. Such a conformation of surfactant occupies a surface area of several hundreds of squared angstroms.
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