Article
Detection of Local Density Distribution of Isolated Silanol Groups on Planar Silica Surfaces Using Nonlinear Optical Molecular Probes
Analytical Chemistry
(1998)
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 Å2) 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 Å2) 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.
Disciplines
Publication Date
1998
DOI
10.1021/ac9805697
Citation Information
Zhi Xu, Ying Dong and Sastry V. Pappu. "Detection of Local Density Distribution of Isolated Silanol Groups on Planar Silica Surfaces Using Nonlinear Optical Molecular Probes" Analytical Chemistry Vol. 70 Iss. 22 (1998) p. 4730 - 4735 Available at: http://works.bepress.com/zhi-xu/13/