Characterization of sol-gel and ormosils via polarity sensitive probes /
Conventional sol-gels are rather hydrophilic. A more hydrophobic material is obtained by preparing organically modified siloxanes (ormosils). We have used three different solvatochromic dyes, (a) ET-33, the best solvatochromic probe known so far, (b)Nile Red (NR), and (c)a ketocyanine (KN) dye, all...
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| Main Authors: | , |
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| Format: | Book Chapter |
| Jezik: | English |
| Teme: | |
| Sorodne knjige/članki: | Vsebovano v:
Sol-gel optics IV, 30 July - 1 August 1997, San Diego, California |
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| Izvleček: | Conventional sol-gels are rather hydrophilic. A more hydrophobic material is obtained by preparing organically modified siloxanes (ormosils). We have used three different solvatochromic dyes, (a) ET-33, the best solvatochromic probe known so far, (b)Nile Red (NR), and (c)a ketocyanine (KN) dye, all with unique solvatochromic properties in both absorption and fluorescence, to probe the micro-polarity of sol-gels. Because ET-33 has a very low molar absorbance and is not fluorescent at all, and KC was hardly solubable in the gel-sol solution, NR was preferably used. NR is an excellent probe and sensitive to the polarity of its microenvironment. Spectroscopic studies reveal a remarkable changes in the absorption band positions as a function of the polarity of the sol-gel which depends on the different precursors used. Furthermore, aging time an temporal stability as a function of different ormosils have been investigated. |
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| Fizični opis: | Str. 284-293. |
| ISBN: | 0819425583 |
| ISSN: | 0277-786X |