Characterization of electrospraying process for polymeric particle fabrication

Jun Yao, Liang Kuang Lim, Jingwei Xie, Jinsong Hua, Chi Hwa Wang

Research output: Contribution to journalArticle

102 Scopus citations

Abstract

Polymeric particles were fabricated using the electrohydrodynamic atomization (EHDA) process in a modified electrospray system where nozzle and ring are enclosed in a shuttle chamber. Two organic liquids (PLGA + DCM (w / v = 7 %), PLGA + ACN (w / v = 8 %)) were tested. The spray current (I) scaling laws with liquid flow rate (Q) were found to be I ∼ Q1 / 4 and the droplet size (dd) scaling laws dd ∼ Q1 / 2, which agrees with the work [Gañán-Calvo, A. M., Dávila, J., & Barrero, A. (1997). Current and droplet size in the electrospraying of liquids. Scaling laws. Journal of Aerosol Science, 28, 249-275] conducted using a regular electrospray system. The size of the fabricated particles decreased with decreasing nozzle-plate distance as well as with increasing conductivity of polymer solution or with decreasing liquid flow rate. The morphology of the fabricated particles became less spherical with increasing Peclet number (Pe). The variation of Pe values due to either using a different polymer or a different ambient temperature resulted in comparable changes in particle morphology. An Okuyama Peclet number analogy has been shown to be promising for characterizing the formation of particle morphology under the use of different solvents.

Original languageEnglish (US)
Pages (from-to)987-1002
Number of pages16
JournalJournal of Aerosol Science
Volume39
Issue number11
DOIs
Publication statusPublished - Nov 2008

    Fingerprint

Keywords

  • Current
  • Droplet
  • Electrospray
  • Electrostatics
  • Microparticles
  • Morphology
  • Particle size

ASJC Scopus subject areas

  • Environmental Engineering
  • Pollution
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Atmospheric Science

Cite this