摘要 : Neutron reflectivity has allowed the measurement at nanometric resolution of the structures formed when high internal phase water/oil emulsions are in contact with hydrophobic and hydrophilic surfaces prepared at planar faces of s... 展开 Neutron reflectivity has allowed the measurement at nanometric resolution of the structures formed when high internal phase water/oil emulsions are in contact with hydrophobic and hydrophilic surfaces prepared at planar faces of silicon blocks. The emulsion was a dispersion of micrometer sized droplets of saltwater-in-hexadecane. Contrast variation by selective deuteration of different components of the emulsion shows that at nanometric resolution an oil-rich phase is produced at the solid-emulsion interface independent of the nature of the solid surface. There is an almost complete surfactant monolayer at the hydrophilic solid face and then a hexadecane-rich layer that persists for 150 Angstrom. Both are less pronounced for the hydrophobic surface, but not qualitatively different. The hexadecane-aqueous interfaces are highly curved with an similar to500 Angstrom radius-compared with the micron radius of the aqueous droplets. [References: 21] 收起