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Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: a study by conventional and DNP-enhanced Si-29 solid-state NMR

TitleSpatial distribution of organic functional groups supported on mesoporous silica nanoparticles: a study by conventional and DNP-enhanced Si-29 solid-state NMR
Publication TypeJournal Article
Year of Publication2017
AuthorsKobayashi, T, Singappuli-Arachchige, D, Wang, ZR, Slowing, II, Pruski, M
JournalPhysical Chemistry Chemical Physics
Volume19
Pagination1781-1789
Date Published01
Type of ArticleArticle
ISBN Number1463-9076
Accession NumberWOS:000394426400010
Keywordscalculations, chemistry, co-condensation, dynamic nuclear-polarization, guest molecules, magnetic-resonance, physics, rotating solids, selective functionalization, site-isolation, Spectroscopy, surface, theoretical
Abstract

Solid-state NMR spectroscopy, both conventional and dynamic nuclear polarization (DNP)-enhanced, was employed to study the spatial distribution of organic functional groups attached to the surface of mesoporous silica nanoparticles via co-condensation and grafting. The most revealing information was provided by DNP-enhanced two-dimensional Si-29-Si-29 correlation measurements, which unambiguously showed that post-synthesis grafting leads to a more homogeneous dispersion of propyl and mercaptopropyl functionalities than co-condensation. During the anhydrous grafting process, the organosilane precursors do not self-condense and are unlikely to bond to the silica surface in close proximity (less than 4 (A) over circle) due to the limited availability of suitably arranged hydroxyl groups.

DOI10.1039/c6cp07642d
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3D Catalysis

Alternate JournalPhys. Chem. Chem. Phys.