Characterization of sol gel and ormosils via polarity-sensitive probes

Aleksandra Lobnik; Otto S. Wolfbeis

doi:10.1117/12.284126

2 October 1997 Characterization of sol gel and ormosils via polarity-sensitive probes

Aleksandra Lobnik, Otto S. Wolfbeis

Proceedings Volume 3136, Sol-Gel Optics IV; (1997) https://doi.org/10.1117/12.284126
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

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, (1) ET-33, the best solvatochromic probe known so far, (2) Nile red (NR), and (3) a ketocyanine (KC) 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 soluble in the sol- gel solution, NR was preferably used. NR is an excellent probe and sensitive to the polarity of its microenvironment. Spectroscopic studies reveal 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 and temporal stability as a function of different ormosils have been investigated.

Citation Download Citation

Aleksandra Lobnik and Otto S. Wolfbeis "Characterization of sol gel and ormosils via polarity-sensitive probes", Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); https://doi.org/10.1117/12.284126

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