Pore Structure Analysis Via Small Angle X-Ray Scattering And Contrast Matching

Abstract Contrast matching is often carried out using small angle neutron scattering (SANS) and adsorbed H 2 O/D 2 O mixtures in an effort to obtain additional port structure information. In this work, we explore the use of single adsorbates with similar electron density to those of the matrix so that contrast-matching may be conducted with small angle x-ray scattering (SAXS). In particular, we have used a series of halogenated organic liquids and several porous and particulate silicas anc a microporous carbon to demonstrate contrast matching with SAXS. Also halogenated silylation compounds have been used which yield surface modification groups with electron density similar to silica. From analyzing the change in scattering as a function of adsorbate loading or surface modification, pore morphology, pore size distribution and/or surface texture information is obtained.