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.