Abstract
By combining sol–gel technology with emulsion chemistry, it is possible to produce spherical particles with a designed microstructure based on a judicious choice of solvent/surfactant and sol–gel reaction parameters. When an active molecule is located in the aqueous droplet of a water-in-oil (W/O) emulsion, encapsulation occurs as the silicon precursors polymerise to build an oxide cage around the active species. By changing the solvent–surfactant combination, the particle size can be varied from 10 nm to 100 μm. The size of the particles is controlled by the size of the emulsion droplet, which acts as a nano-reactor for the sol–gel reaction. The release profiles can be tailored, independently of the particle size, by controlling the internal structure of the particles: pore volume, pore size, tortuosity, and surface chemistry (e.g. by introduction of trialkoxysilane). This can be easily achieved by controlling sol–gel processing parameters such as the water-to-alkoxide ratio, pH, alkoxide concentration, ageing, drying time and temperature.
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Acknowledgements
We would like to thank our colleagues from ANSTO with various sample characterizations in particular Joel Davis and Dr. Arthur Day for SEM and Dr. Greg Lumpkin for TEM on the Triton X-114 samples.
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Barbé, C.J., Kong, L., Finnie, K.S. et al. Sol–gel matrices for controlled release: from macro to nano using emulsion polymerisation. J Sol-Gel Sci Technol 46, 393–409 (2008). https://doi.org/10.1007/s10971-008-1721-4
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DOI: https://doi.org/10.1007/s10971-008-1721-4