Accessibility of amino groups in postsynthetically modified mesoporous silica

Ritter, Hanna; Brühwiler, Dominik

doi:10.1021/jp901983j

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Accessibility of amino groups in postsynthetically modified mesoporous silica
Authors:	Ritter, Hanna Brühwiler, Dominik
DOI:	10.1021/jp901983j
Published in:	The Journal of Physical Chemistry C
Volume(Issue):	113
Issue:	24
Page(s):	10667
Pages to:	10674
Issue Date:	2009
Publisher / Ed. Institution:	American Chemical Society
ISSN:	1932-7447 1932-7455
Language:	English
Subjects:	2009; ICBC; Mesopores; Accessibility
Subject (DDC):	540: Chemistry
Abstract:	The accessibility of amino groups in postsynthetically functionalized mesoporous silica MCM-41, MCM-48, and SBA-15 is investigated by reaction with fluorescein isothiocyanate (FITC). The quantitative analysis of the surface-grafted amino groups in relation to the amount of coupled FITC over a wide range of loadings affords information about potential pore blocking. In the pore diameter domain of 3-4 nm, the actual pore size of materials with a one-dimensional channel system (MCM-41) strongly affects the FITC coupling yield and the distribution of the anchored fluorescein moieties. In the case of SBA-15 (7.6 nm pore diameter), the accessibility of the grafted amino groups is similar to what is expected for a material with a completely open surface. However, grafting in the intrawall micropores of SBA-15 leads to a substantial fraction of inaccessible amino groups. As a direct consequence of short channel lengths and large external surface area, excellent accessibility is also observed for nanometer-sized MCM-41 (3.2 nm pore diameter).
URI:	https://digitalcollection.zhaw.ch/handle/11475/2650
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	Life Sciences and Facility Management
Organisational Unit:	Institute of Chemistry and Biotechnology (ICBT)
Appears in collections:	Publikationen Life Sciences und Facility Management

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Ritter, H., & Brühwiler, D. (2009). Accessibility of amino groups in postsynthetically modified mesoporous silica. The Journal of Physical Chemistry C, 113(24), 10667–10674. https://doi.org/10.1021/jp901983j

Ritter, H. and Brühwiler, D. (2009) ‘Accessibility of amino groups in postsynthetically modified mesoporous silica’, The Journal of Physical Chemistry C, 113(24), pp. 10667–10674. Available at: https://doi.org/10.1021/jp901983j.

H. Ritter and D. Brühwiler, “Accessibility of amino groups in postsynthetically modified mesoporous silica,” The Journal of Physical Chemistry C, vol. 113, no. 24, pp. 10667–10674, 2009, doi: 10.1021/jp901983j.

RITTER, Hanna und Dominik BRÜHWILER, 2009. Accessibility of amino groups in postsynthetically modified mesoporous silica. The Journal of Physical Chemistry C. 2009. Bd. 113, Nr. 24, S. 10667–10674. DOI 10.1021/jp901983j

Ritter, Hanna, and Dominik Brühwiler. 2009. “Accessibility of Amino Groups in Postsynthetically Modified Mesoporous Silica.” The Journal of Physical Chemistry C 113 (24): 10667–74. https://doi.org/10.1021/jp901983j.

Ritter, Hanna, and Dominik Brühwiler. “Accessibility of Amino Groups in Postsynthetically Modified Mesoporous Silica.” The Journal of Physical Chemistry C, vol. 113, no. 24, 2009, pp. 10667–74, https://doi.org/10.1021/jp901983j.