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Titolo:
OPTICAL-TRANSMISSION PROPERTIES OF SILICA AEROGELS PREPARED FROM POLYETHOXIDISILOXANES
Autore:
PAJONK GM; ELALOUI E; CHEVALIER B; BEGAG R;
Indirizzi:
UNIV LYON 1,LAB APPLICAT CHIM ENVIRONM,UMR CNRS 563443,BLD 11 NOVEMBRE 1918 F-69622 VILLEURBANNE FRANCE CSTB F-38000 ST MARTIN DHER FRANCE
Titolo Testata:
Journal of non-crystalline solids
fascicolo: 2-3, volume: 210, anno: 1997,
pagine: 224 - 231
SICI:
0022-3093(1997)210:2-3<224:OPOSAP>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSPARENCY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
G.M. Pajonk et al., "OPTICAL-TRANSMISSION PROPERTIES OF SILICA AEROGELS PREPARED FROM POLYETHOXIDISILOXANES", Journal of non-crystalline solids, 210(2-3), 1997, pp. 224-231

Abstract

Transparent, crack-fret low density silica monolithic aerogels synthesized from a series of polyethoxidisiloxanes have been characterized in the UV-visible-NIR optical range (0.3-2.5 mu m). Normal hemispherical transmittances in the visible range tau(v)(nh) were measured as wellas extinction coefficients at 550 nm. These quantities are valuable parameters to quantify the image quality seen through a piece of aerogel by an empirical index called the transparency ratio (TR). The transparency ratios depend upon catalysis, volumic percentage of solvent andchemical nature of precursors, at the sol-gel step, as well as the supercritical temperature of drying and the sample thickness. Results show that the transparency ratio of the best aerogel is relatively closeto that of a simple window pane of comparable thicknesses (0.92 versus 0.99, respectively) while their respective extinction coefficients at 550 nm are similar (16.3 m(-1) versus 16.4 m(-1), respectively).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/05/20 alle ore 15:01:08