Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-23479
Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Silica particles with fluorescein-labelled cores for evaluating accessibility through fluorescence quenching by copper
Authors: Gallagher, Samuel H.
Schlauri, Paul
Cesari, Emanuele
Durrer, Julian
Brühwiler, Dominik
et. al: No
DOI: 10.1039/D1NA00599E
10.21256/zhaw-23479
Published in: Nanoscale Advances
Volume(Issue): 3
Issue: 22
Page(s): 6459
Pages to: 6467
Issue Date: 2021
Publisher / Ed. Institution: Royal Society of Chemistry
ISSN: 2516-0230
Language: English
Subject (DDC): 540: Chemistry
Abstract: Core–shell particles with fluorescent cores were synthesised by growing silica shells on fluorescein-labelled Stöber-type particles. The porosity of the shell could be altered in a subsequent pseudomorphic transformation step, without affecting the particle size and shape. These core–shell particles constitute a platform for the evaluation of pore connectivity and core accessibility by observing the effect of a quencher on the fluorescence signal emitted by the fluorescein-labelled cores. In combination with argon sorption measurements, quenching experiments with copper provided valuable information on the porosity generated during the shell formation process. It was further observed that the introduction of well-defined mesopores by pseudomorphic transformation in the presence of a structure-directing agent reduces the core accessibility. This led to the conclusion that the analysis by conventional gas sorption methods paints an incomplete picture of the mesoporous structure, in particular with regard to pores that do not offer an unobstructed path from the external particle surface to the core.
URI: https://digitalcollection.zhaw.ch/handle/11475/23479
Fulltext version: Published version
License (according to publishing contract): CC BY-NC 3.0: Attribution - Non commercial 3.0 Unported
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Published as part of the ZHAW project: Multimodal Porous Particles
Appears in collections:Publikationen Life Sciences und Facility Management

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