Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Preparation of Porous Nanostructures Controlled by Electrospray

  • Nguyen, Dung The (Department of Chemical Engineering, Kangwon National University) ;
  • Nah, In Wook (Center for Energy Convergence, Korea Institute of Science and Technology) ;
  • Kim, Kyo-Seon (Department of Chemical Engineering, Kangwon National University)
  • Received : 2014.12.29
  • Accepted : 2015.02.12
  • Published : 2015.10.01
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Abstract

Various solid structures were prepared by electrospray technique. In this process, liquid flows out from a capillary nozzle under a high electrical potential and is subjected to an electric field, which causes elongation of the meniscus to form a jet. In our study, by controlling the amount of polyvinyl pyrrolydone in precursor solution, the jet either disrupted into droplets for the formation of spherical particles or was stretched in the electric field for the formation of fibers. During the electrospray process, the ethanol solvent was evaporated and induced the solidification of precursors, forming solid particles. The evaporation of ethanol solvent also enhanced the mass transport of solutes from the inner core to the solid shell, which facilitated fabrication of porous and hollow structure. The network structures were also prepared by heating the collector.

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