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X-ray diffraction studies performed during the nucleation of hydrocerussite (PbCO 3 ·Pb(OH) 2 ) from a supersaturated aqueous solution, at a floating fatty acid monolayer template, reveal (√7×√7)-R19.1° reconstruction at the (001) surface of hydrocerussite. Reordering of surface atoms into epitaxial superstructures is thought to require extremely clean surfaces (cleaned electrochemically...
Nanometer-scale thick liquid films of poly(methylhydro-dimethyl)siloxane copolymer (PMDMS) deposited on hydrophilic and hydrophobic solid organic films have been studied using synchrotron X-ray specular reflectivity (XRR). The physico-chemical properties of liquid PMDMS at the interfacial level are controlled by the nature of the solid surface. Detailed analysis of the XRR-data revealed the formation...
We have performed in situ X-ray reflectivity studies of the growth of octadecyltrichlorosilane (OTS) monolayers on oxidized Si(111) from solutions in heptane. We find that for all concentrations, the film grows through the formation of islands of vertical molecules. The coverage follows a simple Langmuir form as a function of time, except for very low concentration solutions at early times, where...
Much less is known about structure at solid-liquid interfaces than at solid or liquid surfaces, largely because it is more difficult for experimental probes to penetrate into an interface. In recent years, the availability of synchrotron radiation (which is intense and collimated, and whose energy and thus penetration depth can be varied) has made scattering experiments at such interfaces possible...
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