Induction of foaming in vacuum drying by needle stimulation and the impact of solution viscosity, vapor pressure, and the type of solute and solvent

Akiho Fujioka, Rina Yamamoto, Olivier Tramis, Hiroaki Ishida, Tsutomu Ono, Naoyuki Ishida, Koreyoshi Imamura

Research output: Contribution to journalArticlepeer-review

Abstract

Reliable induction of foaming is indispensable for vacuum foam drying. We previously showed that, adequate partial drying followed by puncturing a solution with a needle (needle stimulation) resulted in the induction of the foaming, even under insufficient vacuum where foaming is minimal. Herein, characteristics of needle-stimulation-induced foaming was investigated, focusing on the impact of solution viscosity and vapor pressure. Different combinations of solutes (disaccharides, polyvinylpyrrolidones, polyacrylic acid, Eudragit) and solvents (methanol, ethanol, isopropanol, water) were used. Needle stimulation was conducted after different periods of initial vacuum drying, and the probability of foaming induction during the restart of vacuum drying was determined. Each series of solutes (polymers and disaccharides) respectively indicate solvent-independent correlations between foaming induction probability and solution viscosity. The existence of a lower limit for the solution vapor pressure required for foaming induction was also implied. A possible mechanism for needle-stimulation-induced foaming under reduced pressure is proposed.

Original languageEnglish
JournalDrying Technology
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • alcohols
  • foaming induction
  • needle stimulation
  • polyvinylpyrrolidone
  • sugar
  • Vacuum foam drying

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

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