Effects of water/silane r-ratio and of humidity on properties of sol-gel entrapped indicators

Claudio Rottman; David Avnir

doi:10.1117/12.384334

Effects of water/silane r-ratio and of humidity on properties of sol-gel entrapped indicators

Claudio Rottman, David Avnir^*

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

When entrapping indicators in sol-gel materials for optical sensing purposes, one should be careful to take into account that changes in the cage properties, caused by variations in the synthetic procedures, might affect the performance of the dopant. We show - for SiO₂ sol-gel entrapped pH and polarity indicators that such variations are brought about by changing the water-silane r-ratio preparation conditions and by changing the environmental humidity to which the material is exposed. The observations are interpreted in terms of changes in the acidity and polarity of the cage surface.

Original language	English
Pages (from-to)	154-162
Number of pages	9
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	3943
DOIs	https://doi.org/10.1117/12.384334
State	Published - 2003

Keywords

Doped sol-gel materials
Humidity
PH-indicators
Polarity-indicators
Sensors
Spectral shifts

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10.1117/12.384334

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abstract = "When entrapping indicators in sol-gel materials for optical sensing purposes, one should be careful to take into account that changes in the cage properties, caused by variations in the synthetic procedures, might affect the performance of the dopant. We show - for SiO2 sol-gel entrapped pH and polarity indicators that such variations are brought about by changing the water-silane r-ratio preparation conditions and by changing the environmental humidity to which the material is exposed. The observations are interpreted in terms of changes in the acidity and polarity of the cage surface.",

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AB - When entrapping indicators in sol-gel materials for optical sensing purposes, one should be careful to take into account that changes in the cage properties, caused by variations in the synthetic procedures, might affect the performance of the dopant. We show - for SiO2 sol-gel entrapped pH and polarity indicators that such variations are brought about by changing the water-silane r-ratio preparation conditions and by changing the environmental humidity to which the material is exposed. The observations are interpreted in terms of changes in the acidity and polarity of the cage surface.

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Effects of water/silane r-ratio and of humidity on properties of sol-gel entrapped indicators

Abstract

Keywords

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