Preparation of tin oxide gels with versatile pore structures

摘要

Hydrous tin oxide gels were subjected toconsecutive solvent-evaporation (SE) and CO2 supercritical (CS)drying steps, followed by re-hydration at low (30%) humidity,and the effects on pore structure of the SE drying duration andparticle surface potential of the gel were investigated. Thedifference in surface potential has been found to imposesignificant variations in initial pore size distribution, while theSE drying step tends to narrow such differences andsimultaneously reduce the mean pore size .It is demonstratedthat varieties of pore structures have thus been obtained bysimply varying these two parameters.