Synthesis of macroporous silica from solid-stabilised emulsion templates |
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Authors: | Ibon Aranberri Bernard P Binks John H Clint Paul D I Fletcher |
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Affiliation: | (1) Institute for Polymer Materials POLYMAT and Grupo de Ingeniería Química, Departamento de Química Aplicada, Facultad de Ciencias Químicas, The University of the Basque Country, Centro Joxe Mari Korta, Avda Tolosa 72, 20018 Donostia-San Sebastian, Spain;(2) Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull, HU6 7RX, UK |
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Abstract: | We have investigated the microstructures of the solid residue left behind after the evaporation of solid-stabilised emulsions.
The correlation between the microstructure and the properties and preparation conditions of the emulsions will be thoroughly
discussed. The type of microstructure is related to the conditions (oil type, oil content, particle type, particle concentration
and emulsion type) of the initial emulsion. Solid residues left after evaporation of oil-in-water emulsions containing volatile
oils (relative to water) show a “knobbly” microstructure. When oils with similar or lower vapour pressure to that of water
were used, “sponge-like” structures were obtained. For emulsions containing volatile oils, the mean drop diameter is similar
to the mean pore diameter, whereas when oils with low vapour pressure are used, the pores are much smaller. Finally, this
paper will illustrate that stable toluene-in-water emulsions leave porous microstructures, whereas water-in-toluene emulsions
and emulsions close to the phase inversion show sheet-like or “knobbly” structure. |
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Keywords: | Solid-stable emulsion Nanoparticles Porous Microstructure |
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