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Titolo:
Microviscosities at the porous cage of silica gel-glasses and ormosils through fluorescence anisotropy
Autore:
Ferrer, ML; del Monte, F; Levy, D;
Indirizzi:
CSIC, ICMM, Madrid 28049, Spain CSIC Madrid Spain 28049CSIC, ICMM, Madrid 28049, Spain INTA, LINES, Madrid 28850, Spain INTA Madrid Spain 28850INTA, LINES, Madrid 28850, Spain
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 45, volume: 105, anno: 2001,
pagine: 11076 - 11080
SICI:
1520-6106(20011115)105:45<11076:MATPCO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLVATION DYNAMICS; STEADY-STATE; THIN-FILMS; SOL-GELS; J-DIMERS; COUMARIN-153; MEMBRANES; SURFACE; PROBES; LIQUID;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: del Monte, F CSIC, ICMM, Madrid 28049, Spain CSIC Madrid Spain 28049CSIC, ICMM, Madrid 28049, Spain
Citazione:
M.L. Ferrer et al., "Microviscosities at the porous cage of silica gel-glasses and ormosils through fluorescence anisotropy", J PHYS CH B, 105(45), 2001, pp. 11076-11080

Abstract

Tailoring of the chemical properties at the porous cage of silica matrixesis the objective of many works in the last years, since it determines the different allocation of dopants and thus its future reactivity and functionality. One approach for the modification of such chemical properties is theincorporation of surfactants. Ormosils (organically modified silicates) can be prepared by the sol-gel process through the incorporation of cetyltrimethylammonium bromide (CTA-B). The study of the fluorescent properties of coumarin 153 (C153), which is also incorporated, will provide information ofthe environment surrounding the probe within the porosity of the ormosils. The fluorescent study of C153-doped ormosils was based on the following fluorescence measurements: (a) absorption, excitation, and emission spectra, (b) fluorescence lifetimes, and (c) anisotropy. Time-resolved anisotropy will provide a quantitative determination of the different microviscosity values that can be found within the porosity of gel-glasses and ormosils.

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Documento generato il 31/03/20 alle ore 18:20:53