writer：Wendong Liu, Michael Kappl, and Hans-Jürgen Butt.
keywords：supraparticles, porous, evaporation, superamphiphobic surface, photocatalysis
source：期刊
specific source：ACS Nano, 2019, 13(12), 13949-13956.
Issue time：2019年
Supraparticles consisting of nano- or microparticles have
potential applications as, for example, photonic crystals, drug carriers, or
heterogeneous catalysts. To avoid the use of solvent or processing liquid,
one can make supraparticles by evaporating droplets of aqueous
suspensions from super-liquid-repellent surfaces. Herein, a method to
adjust the porosity of supraparticles is described; a high porosity is
desired, for example, in catalysis. To prepare highly porous TiO2
supraparticles, polymer nanoparticles are co-dispersed in the suspension.
Supraparticles are formed through evaporation of aqueous suspension
droplets on superamphiphobic surfaces followed by calcination of the
sacri?cial polymer particles. The increase of porosity of up to 92%
resulted in enhanced photocatalytic activity while maintaining su?cient
mechanical stability.