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Titolo:
Photoinduced switching of nanocomposites consisting of azobenzene and molecular sieves: investigation of the switching states
Autore:
Hoffmann, K; Resch-Genger, U; Marlow, F;
Indirizzi:
Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany Max Planck Inst Kohlenforsch Mulheim Germany D-45470 70 Mulheim, Germany Fed Inst Mat Res & Testing, D-12489 Berlin, Germany Fed Inst Mat Res & Testing Berlin Germany D-12489 -12489 Berlin, Germany
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1-3, volume: 41, anno: 2000,
pagine: 99 - 106
SICI:
1387-1811(200012)41:1-3<99:PSONCO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPTICAL-PROPERTIES; ZEOLITES; PHOTOCHEMISTRY; ALPO4-5;
Keywords:
molecular sieve; azobenzene; host-guest; photoswitchable birefringence; optical switching;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Marlow, F Max Planck Inst Kohlenforsch, Kaiser Wilhelm Pl 1, D-45470 Mulheim, Germany Max Planck Inst Kohlenforsch Kaiser Wilhelm Pl 1 Mulheim Germany D-45470
Citazione:
K. Hoffmann et al., "Photoinduced switching of nanocomposites consisting of azobenzene and molecular sieves: investigation of the switching states", MICROP M M, 41(1-3), 2000, pp. 99-106

Abstract

Cis-trans photoisomerization of azobenzene in the molecular sieve hosts AlPO4-5 and ZSM-5 causes large and reversible changes of the refractive indexof the composite systems. This process strongly depends on both the irradiation wavelength and the molecular sieve host. The rate constant of the thermal relaxation of the cis-state composites increases from 2.0 x 10(-6) s(-1) in AlPO4-5 to 3.1 x 10(-5) s(-1) in ZSM-5. Both switching states are stable over hours or days. The reversibility of the switching process exceeds several hundred switching cycles indicating that the cis-trans photoisomerization proceeds without significant side reactions in both matrices. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/07/18 alle ore 13:22:56