Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-1172
Title: Bimodal mesoporous silica with bottleneck pores
Authors : Reber, Michael
Brühwiler, Dominik
Published in : Dalton Transactions
Volume(Issue) : 44
Issue : 41
Pages : 17960
Pages to: 17967
Issue Date: 2015
Language : Englisch / English
Subject (DDC) : 540: Chemie
Abstract: Bimodal mesoporous silica consisting of two sets of well-defined mesopores is synthesized by a partial pseudomorphic transformation of an ordered mesoporous starting material (SBA-15 type). The introduction of a second set of smaller mesopores (MCM-41 type) establishes a pore system with bottlenecks that restricts the access to the core of the bimodal mesoporous silica particles. The particle size and shape of the starting material are retained, but micropores present in the starting material disappear during the transformation, leading to a true bimodal mesoporous product. A varying degree of transformation allows the adjustment of the pore volume contribution of the two mesopore domains. Information on the accessibility of the mesopores is obtained by the adsorption of fluorescence-labeled poly(amidoamine) dendrimers and imaging by confocal laser scanning microscopy. This information is correlated with nitrogen sorption data to provide insights regarding the spatial distribution of the two mesopore domains. The bimodal mesoporous materials are excellent model systems for the investigation of cavitation effects in nitrogen desorption isotherms.
Departement: Life Sciences und Facility Management
Organisational Unit: Institut für Chemie und Biotechnologie (ICBT)
Publication type: Beitrag in wissenschaftlicher Zeitschrift / Article in scientific Journal
DOI : 10.1039/C5DT03082J
10.21256/zhaw-1172
ISSN: 1477-9226
1477-9234
URI: https://digitalcollection.zhaw.ch/handle/11475/1171
Appears in Collections:Publikationen Life Sciences und Facility Management

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