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Title: Selective functionalization of the mesopores of SBA-15

In this study, a method has been developed that permits the highly selective functionalization of the interior and exterior surfaces of the ubiquitous mesoporous material, SBA-15. The key step is reloading the as-synthesized material with structure-directing agent, Pluronic® P123, prior to selective functionalization of the external surface with a silylating agent. This new approach represents a significant improvement over literature procedures. Results from physisorption analyses as well as solid-state NMR permit a detailed, quantitative assessment of functionalized SBA-15. This work also provides insight into the stability of the silyl layer during extraction procedures – an issue often neglected in other studies but of significant importance as decomposition of this layer could result in the introduction of new silanols and reduce the effectiveness of any selective grafting procedure.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1]
  1. Queen's Univ., Kingston, ON (Canada)
  2. Iowa State Univ., Ames, IA (United States)
Publication Date:
OSTI Identifier:
1227147
Report Number(s):
IS-J--8587
Journal ID: ISSN 1387-1811; PII: S138718111400612X
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Microporous and Mesoporous Materials
Additional Journal Information:
Journal Volume: 203; Journal Issue: C; Journal ID: ISSN 1387-1811
Publisher:
Elsevier
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE mesoporous silica; SBA-15; silylation; surface functionalization; selective grafting; solid state NMR