Unusual Selectivity in Solubilization by Block Copolymer Micelles

droxide surface sites, characteristics of water a t the interface, and chemical structures of specifically adsorbed molecules. Also, ATR-CIR spectroscopy can qualitatively describe the influence of pH and “inert” electrolyte ions on reactions that occur a t lor near the solid-solution interface. Finally, since signal intensity is not necessarily proportional to the concentration of goethite (unless two systems have the same degree of dispersivity), this technique can be regarded as semiquantitative if and only if IR absorption bands coming from chemical bulk groups of the solid are used as internal standards. Consequently, ATR-CIR spectroscopy offers an in situ means of studying some very important reactions which occur at the solid-water interface such as photocatalysis, surface redox reactions, interfacial complexation, and ion-exchange reactions. By using such an analytical tool as ATR-CIR we should eventually be able to understand the complex nature of surface reaction stoichiometries which will in turn lead to better predictive models. Since aqueous interfacial reaction chemistry is important to a broad array of processes including mineral dissolution and flotation, corrosion, heterogeneous catalysis, and microcontaminant transport, this technique promises to be used a great deal more in the future.