Fluorescence metrology of silica sol-gels - The effect of D2O and inorganic salts |
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Authors: | D J S Birch and C D Geddes |
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Institution: | (1) Photophysics Group, Department of Physics and Applied Physics, University of Strathclyde, 107 Rottenrow, G4 ONG Glasgow, UK |
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Abstract: | We have developed a new method for measuringin- situ the growth of the nanometre-size silica particles which lead to the formation of sol-gel glasses. This technique is based
on the decay of fluorescence polarisation anisotropy due to Brownian rotation of dye molecules bound to the particles. Results
to date give near ?ngstrom resolution and demonstrate the feasibility of the approach both for providing industrial quality
control and helping fundamental research. Our approach has several key advantages over traditional techniques for nanometre
metrology, such as small angle X-ray and neutron scattering and electron microscopy. In this paper we present silica particle
growth dynamics in a hydrogel as detected by two near-infrared dyes, the effect of adding D2O on the hydrodynamic radius and the effect of salt addition. |
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Keywords: | Fluorescence anisotropy sol-gel particle size syneresis |
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