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

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 29Si– 29Si correlation measurements, which unambiguously showed that post-synthesis grafting leads to a more homogeneous dispersion of propyl and mercaptopropyl functionalities than co-condensation. Furthermore, 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 Å) due to the limited availability of suitably arranged hydroxyl groups.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9221
Journal ID: ISSN 1463-9076; PPCPFQ; TRN: US1701092
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 19; Journal Issue: 3; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1347402

Kobayashi, Takeshi, Singappuli-Arachchige, Dilini, Wang, Zhuoran, Slowing, Igor I., and Pruski, Marek. Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: A study by conventional and DNP-enhanced 29Si solid-state NMR. United States: N. p., Web. doi:10.1039/C6CP07642D.
Kobayashi, Takeshi, Singappuli-Arachchige, Dilini, Wang, Zhuoran, Slowing, Igor I., & Pruski, Marek. Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: A study by conventional and DNP-enhanced 29Si solid-state NMR. United States. doi:10.1039/C6CP07642D.
Kobayashi, Takeshi, Singappuli-Arachchige, Dilini, Wang, Zhuoran, Slowing, Igor I., and Pruski, Marek. 2016. "Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: A study by conventional and DNP-enhanced 29Si solid-state NMR". United States. doi:10.1039/C6CP07642D. https://www.osti.gov/servlets/purl/1347402.
@article{osti_1347402,
title = {Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: A study by conventional and DNP-enhanced 29Si solid-state NMR},
author = {Kobayashi, Takeshi and Singappuli-Arachchige, Dilini and Wang, Zhuoran and Slowing, Igor I. and Pruski, Marek},
abstractNote = {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 29Si–29Si correlation measurements, which unambiguously showed that post-synthesis grafting leads to a more homogeneous dispersion of propyl and mercaptopropyl functionalities than co-condensation. Furthermore, 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 Å) due to the limited availability of suitably arranged hydroxyl groups.},
doi = {10.1039/C6CP07642D},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
number = 3,
volume = 19,
place = {United States},
year = {2016},
month = {12}
}

Works referenced in this record:

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