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 language | English |
|---|---|
| Pages (from-to) | 181-191 |
| Number of pages | 11 |
| Journal | Physics and Chemistry of Liquids |
| Volume | 38 |
| Issue number | 2 |
| Publication status | Published - 2000 Jan 1 |
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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 journal › Article
}
TY - JOUR
T1 - Phase separation of polyethylene glycol/salt aqueous two-phase systems
AU - Kim, Chan Wha
AU - Rha, Chokyun
PY - 2000/1/1
Y1 - 2000/1/1
N2 - 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.
AB - 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.
KW - Aqueous two-phase system
KW - Excluded volume
KW - PEG
KW - Phase separation
KW - Solubility of salt
UR - http://www.scopus.com/inward/record.url?scp=0033920392&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033920392&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0033920392
VL - 38
SP - 181
EP - 191
JO - Physics and Chemistry of Liquids
JF - Physics and Chemistry of Liquids
SN - 0031-9104
IS - 2
ER -