Characterization of multi-phase aerogels by contrast-matching SANS

2019-06-01 00:07:46

phase matching oxide Ru aerogel

责任者: Merzbacher, Celia I.;Barker, John G.;Swider, Karen E.;Ryan, Joseph V.;Bernstein, Robert A.;Rolison, Debra R. 单位: Naval Research Lab, Washington, DC, USA 来源出处: Journal of Non-Crystalline Solids,1998,225():234-238 摘要: Contrast-matching small-angle neutron scattering (SANS) has been used to independently characterize the structures of two-phase aerogels consisting of a metal oxide supported on silica aerogel. Ru oxide was formed on silica aerogel by oxidation at 400 °C of ruthenocene, impregnated from the vapor phase, or Ru(III)acetylacetonate, impregnated via an acetone solution. Fe oxide was formed by vapor-phase impregnation of ferrocene, followed by reduction at 400 °C and exposure to ambient air. The Ru oxide forms particles several tens of nanometers in diameter in the aerogel mesopores. The Fe oxide forms a coating which mimics the structure of the support. The silica aerogel structure is not affected by the deposition and heat treatment processes. 关键词: Silica gel;Oxidation;Neutron scattering;Ruthenium compounds;Impregnation;Iron oxides;Reduction;Nanostructured materials;Deposition;Heat treatment;Aerogels;Contrast matching small angle neutron scattering (SANS);Ruthenium oxide;Ferrocene