| Title |
Synthesis of Porous Particles by Electrospray-Assisted Self-Assembly for Water-Repellent or Photocatalytic Surfaces |
| Authors |
(Young-sang Cho); (Younghyun Lee); (Nahee Ku); (Sugueun Ji); (Young Seok Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2020.58.2.112 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
encapsulation; photocatalysis; porous media; powders; spraying; interfacial phenomena |
| Abstract |
In this study, an electrospray technique was used for the synthesis of macroporous ceramic particles, such as silica or titania, by a colloidal templating method. For this purpose, a suspension of polystyrene nanospheres was synthesized by dispersion polymerization for use as sacrificial templates. The feed solution containing a ceramic precursor and polymeric beads was injected through a metallic nozzle under a high electric field for nebulization of aerosol droplets as micro-reactors. Under ambient air conditions, the volatile components were evaporated from the droplets, and gelation of the precursor was completed simultaneously. The resulting supra-aggregates were then collected, and calcination was performed to form porous ceramic particles by removing the polymeric templates. As a demonstrative application, the porous particles of silica were deposited as a coating film for superhydrophobic surfaces with a high water contact angle larger than 150°. Furthermore, macroporous titania particles were used as photocatalytic particles in a wastewater system with first-order reaction kinetics.(Received October 21, 2019; Accepted December 14, 2019) |