Yingnan Dong, S. V. Pappu, Zhi Xu
Nov 1, 1998
Citations
2
Influential Citations
61
Citations
Journal
Journal name not available for this finding
Abstract
Crystal Violet has been used as a nonlinear optical molecular probe for the detection of local density distribution of isolated silanol groups on planar silica surfaces. Because of its large size (∼120 A2) and nearly flat adsorption geometry, Crystal Violet has successfully separated the truly isolated silanol groups (i.e., the silanol groups that cannot form a hydrogen bond with their neighbors by any means, ∼9.3 ×1013 cm-2) into two major classes. The first class includes those isolated silanol groups; each is surrounded by a large empty surface area (≥120 A2) in which a Crystal Violet cation can be placed. The surface density of this type of silanol groups is ∼1.1 ×1013 cm-2. The second class includes the rest of the isolated silanol groups with a surface density of 8.2 × 1013 cm-2.