Selective modification of layered silicate nanoparticle edges with fluorophores

0382847 - ÚFCH JH 2013 RIV NL eng J - Journal Article
Bujdák, J. - Danko, M. - Chorvát Jr., D. - Czímerová, A. - Sýkora, Jan - Lang, Kamil
Selective modification of layered silicate nanoparticle edges with fluorophores.
Applied Clay Science. 65-66, SEP 2012 (2012), s. 152-157. ISSN 0169-1317. E-ISSN 1872-9053
R&D Projects: GA ČR GAP207/10/1447; GA ČR GBP208/12/G016
Institutional research plan: CEZ:AV0Z40320502; CEZ:AV0Z40400503
Keywords : fluorescence * fluorophore * grafited day minerals
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.342, year: 2012

The modification of two synthetic layered silicates, fluorohectorite (Coming) and laponite (Laporte). with two reactive silanes functionalized with fluorescent rhodamine or naphthalimide led to the grafting of the silicate particles selectively at the particle edges. The small amounts of grafted silanes were neither detected by infrared spectra nor X-ray diffraction (XRD) patterns. The larger extent of modification with cationic rhodamine-based silane was detected by XRD. The absorption and fluorescence spectra of the colloids of grafted silicates were similar to those of silane-dye precursors. Confocal fluorescence microscopy and fluorescence lifetime imaging detected the fluorohectorite-naphthalimide monolayer films to be optically heterogeneous, which was attributed to the selective location of the bound naphthalimide moieties at the particle edges.
Permanent Link: http://hdl.handle.net/11104/0212957