Abstract
Small-angle neutron scattering (SANS) has been used to characterize Ru–Ti oxide aerogels annealed under various atmospheres and temperatures. The pores were filled with H 2O/D 2O solutions that match the scattering properties of either RuO 2 or TiO 2, therefore scattering from the remaining unmatched phase is measured independently. The structure of the RuO 2 and TiO 2 components of the aerogel detected by SANS depends more on annealing temperature than annealing atmosphere. The results are consistent with a branched, polymeric network made up of 8–16 nm TiO 2 particles and <5-nm RuO 2 particles. The SANS results are supported by TEM. This study demonstrates that contrast-matching SANS is complementary to other techniques for characterizing the structure of two-phase aerogels.
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