Phase separation of polyethylene glycol/salt aqueous two-phase systems

Chan Wha Kim, Chokyun Rha

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Salt in polyethylene glycol (PEG)/salt aqueous two-phase systems was excluded by PEG and concentrated in the solvent volume available for dissolution of salt (PEG-free solvent). The concentration of salt in the PEG-free solvent of the PEG-rich phase was the same as that at the critical point regardless of the compositions of the PEG/salt two-phase systems. This explained that the phase separation of PEG/salt two-phase systems occurs when the concentration of salt in the PEG-free solvent reaches its solubility limit. The concentration of salt required in the PEG-free solvent for the phase separation was lower with higher molecular weight of PEG. The solubility of salt in the PEG-free solvent decreased with increases in the molal surface tension increment of salt. The solubility limit of salt in the PEG-free solvent was 0.93 M for ammonium sulfate, 0.77 M for potassium phosphate, 0.75 M for sodium tartrate, 0.67 M for sodium phosphate, and 0.53 M for potassium citrate.

Original languageEnglish
Pages (from-to)181-191
Number of pages11
JournalPhysics and Chemistry of Liquids
Volume38
Issue number2
Publication statusPublished - 2000 Jan 1

Fingerprint

binary systems (materials)
Phase separation
Polyethylene glycols
glycols
polyethylenes
Salts
salts
solubility
Solubility
Potassium
Phosphates
Potassium Citrate
Sodium
sodium
potassium phosphates
ammonium sulfates
Ammonium Sulfate
citrates
Surface tension
molecular weight

Keywords

  • Aqueous two-phase system
  • Excluded volume
  • PEG
  • Phase separation
  • Solubility of salt

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Phase separation of polyethylene glycol/salt aqueous two-phase systems. / Kim, Chan Wha; Rha, Chokyun.

In: Physics and Chemistry of Liquids, Vol. 38, No. 2, 01.01.2000, p. 181-191.

Research output: Contribution to journalArticle

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