Super-insulating properties of porous ceramic particles fabricated by a self-assembly process using complex fluids
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Porous silica particles were synthesized by an emulsion-assisted self-assembly process. The templating materials, polymericnanospheres or block copolymers, were self-organized with the precursor inside emulsions to prepare porous ceramic particlesafter calcination. The thermal insulating properties of mesoporous, macroporous, and meso-macroporous particles werecompared by measuring their thermal diffusivity using a laser flash apparatus. The insulating properties of the porousparticles could be controlled by changing the emulsification conditions using a rotating cylinder instead of a conventionalhomogenizer to induce a hollow interior structure of the porous particles. The lowest value of the thermal conductivity wasrecorded as roughly 10 mW/mK for the meso-macroporous particles, which is comparable to previous materials includingaerogels. The porous ceramic particles additionally can be applied as coating materials for superhydrophobic surfaces via alotus effect.
Abstract
Porous silica particles were synthesized by an emulsion-assisted self-assembly process. The templating materials, polymericnanospheres or block copolymers, were self-organized with the precursor inside emulsions to prepare porous ceramic particlesafter calcination. The thermal insulating properties of mesoporous, macroporous, and meso-macroporous particles werecompared by measuring their thermal diffusivity using a laser flash apparatus. The insulating properties of the porousparticles could be controlled by changing the emulsification conditions using a rotating cylinder instead of a conventionalhomogenizer to induce a hollow interior structure of the porous particles. The lowest value of the thermal conductivity wasrecorded as roughly 10 mW/mK for the meso-macroporous particles, which is comparable to previous materials includingaerogels. The porous ceramic particles additionally can be applied as coating materials for superhydrophobic surfaces via alotus effect.
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