This proposal continues our research on ion binding to surfactant micelles. Our recent work demonstrates that the details of water structure around micelles are now accessible using Empirical Potential Structure Refinement methods combined with neutron scattering data. Here we wish to probe anion binding to nonionic ethylene oxide (EO) based micelles. Nonionic surfactant templated silicas have thicker walls and better hydrothermal stability than cationic templated silicas, criteria important in many applications. Our research has shown that the presence of anions causes formation of intra-wall porosity in these silicas, suggested to be caused by anion binding to the EO or dehydration of EO resulting from anion binding to water. This experiment will determine the extent of EO dehydration in the presence & absence of anions and the effect on binding of a model silica species to the micelle