Core/Shell Microstructure Induced Synergistic Effect for Efficient Water-Droplet Formation and Cloud-Seeding Application

Yanlong Tai, Haoran Liang, Abdelali Zaki, Nabil El Hadri, Ali M. Abshaev, Buzgigit M. Huchunaev, Steve Griffiths, Mustapha Jouiad, Linda Zou

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Cloud-seeding materials as a promising water-augmentation technology have drawn more attention recently. We designed and synthesized a type of core/shell NaCl/TiO2 (CSNT) particle with controlled particle size, which successfully adsorbed more water vapor (∼295 times at low relative humidity, 20% RH) than that of pure NaCl, deliquesced at a lower environmental RH of 62-66% than the hygroscopic point (hg.p., 75% RH) of NaCl, and formed larger water droplets ∼6-10 times its original measured size area, whereas the pure NaCl still remained as a crystal at the same conditions. The enhanced performance was attributed to the synergistic effect of the hydrophilic TiO2 shell and hygroscopic NaCl core microstructure, which attracted a large amount of water vapor and turned it into a liquid faster. Moreover, the critical particle size of the CSNT particles (0.4-10 μm) as cloud-seeding materials was predicted via the classical Kelvin equation based on their surface hydrophilicity. Finally, the benefits of CSNT particles for cloud-seeding applications were determined visually through in situ observation under an environmental scanning electron microscope on the microscale and cloud chamber experiments on the macroscale, respectively. These excellent and consistent performances positively confirmed that CSNT particles could be promising cloud-seeding materials.

Original languageBritish English
Pages (from-to)12318-12325
Number of pages8
JournalACS Nano
Volume11
Issue number12
DOIs
StatePublished - 26 Dec 2017

Keywords

  • cloud-seeding materials
  • core/shell microstructure
  • hydrophilic surface
  • synergistic effect
  • water-droplet formation

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