Shape-Selective Adsorption of Substituted Benzaldehyde Isomers by a Molecular Sieving Silica Overlayer Prepared by the Chemical Vapor Deposition Method Using Organic Template on Tin Oxide

Abstract

The chemical vapor deposition of a silica overlayer in the presence of template molecules was examined on tin oxide in order to construct surface cavities with a molecular sieving property. On a SiO2/SnO2 sample prepared using a benzaldehyde template, 4-chlorobenzaldehyde and 4-methylbenzaldehyde were adsorbed, while 2-chlorobenzaldehyde and 2-methylbenzaldehyde were not adsorbed. The adsorption of 3-chlorobenzaldehyde was controlled by the thickness of the layer, i.e., the depth of the cavity. It was adsorbed by a shallow cavity, but not by a deep cavity. Thus the shape selectivity due to the shapes of the adsorbate molecule and the cavity was obtained.

Molecular imprinting science and technology: a survey of the literature for the years 2004-2011

“…The development of alternatives to the synthesis of traditional monolithic polymers has been driven by both practical considerations, for example, ease of scale‐up, requirements for integration with other technologies, such as sensors, and for performance issues, for example, mass transfer or flow properties. Methods for preparation of discrete MIP particles, composites and molecularly imprinted polymer surfaces and fibers are areas that have been gaining in prominence over recent years and now constitute a significant portion of the original literature published in the molecular imprinting field …”

Analysis and interpretation of acidic nature of aluminosilicates

“…These clearly point out that the monolayer has Brønsted acidity which are the active sites [47]. The quantification of Brønsted and Lewis acid sites brought the clear conclusion on the thin silica layer, investigated as unique aluminosilicate catalyst or catalyst support [47,[73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89]. is not categorized as the superacid.…”

Molecular-Imprinted Metal Complexes for the Design of Catalytic Structures

“…22.5). Silicate sources have been utilized to grow thin layers of SiO 2 onto oxide surfaces in a layer-by-layer fashion [85][86][87]. The Si(OCH 3 ) 4 precursor reacts with surface silanol groups preferentially, and polymerization does not occur in the absence of surface silanols.…”