| abstract |
Porous materials having a dual surface are disclosed. Also disclosed is a method for their preparation. An example of such a material is a silica gel reacted with a reactive silane intermediate such as (CH 3 ) 2 Si═O and then, with a reactive silane such as ##STR1## to give a dual treated material having --((CH 3 ) 2 SiO) x H on the exterior surface and ##STR2## on the interior surface of the pores. |