Abstract
A novel method for preparing a finely dispersed oil-in-water emulsion is proposed. Octanoic acid dissolved in water at a high temperature of 220 or 230°C at 15 MPa was combined with an aqueous solution of a surfactant and then the mixture was cooled. When a nonionic surfactant, decaglycerol monolaurate (ML-750) or polyoxyethylene sorbitan monolaurate (Tween 20), was used, fine emulsions with a median oil droplet diameter of 100 nm or less were successfully prepared at ML-750 and Tween 20 concentrations of 0.083% (w/v) and 0.042%, respectively, or higher. The diameters were much smaller than those of oil droplets prepared by the conventional homogenization method using a rotor/stator homogenizer. However, an anionic surfactant, sodium dodecyl sulfate, was not adequate for the preparation of such fine emulsions by the proposed method. Although the interfacial tensions between octanoic acid and the surfactant solutions were measured at different temperatures, they were not an indication for selecting a surfactant for the successful preparation of the fine emulsion by the proposed method.
| Original language | English |
|---|---|
| Pages (from-to) | 192-197 |
| Number of pages | 6 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 278 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Oct 1 2004 |
| Externally published | Yes |
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Keywords
- Droplet size
- Interfacial tension
- Octanoic acid
- Oil-in-water emulsion
- Subcritical water
ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
- Surfaces and Interfaces
Cite this
Preparation of finely dispersed O/W emulsion from fatty acid solubilized in subcritical water. / Khuwijitjaru, Pramote; Kimura, Yukitaka; Matsuno, Ryuichi; Adachi, Shuji.
In: Journal of Colloid and Interface Science, Vol. 278, No. 1, 01.10.2004, p. 192-197.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Preparation of finely dispersed O/W emulsion from fatty acid solubilized in subcritical water
AU - Khuwijitjaru, Pramote
AU - Kimura, Yukitaka
AU - Matsuno, Ryuichi
AU - Adachi, Shuji
PY - 2004/10/1
Y1 - 2004/10/1
N2 - A novel method for preparing a finely dispersed oil-in-water emulsion is proposed. Octanoic acid dissolved in water at a high temperature of 220 or 230°C at 15 MPa was combined with an aqueous solution of a surfactant and then the mixture was cooled. When a nonionic surfactant, decaglycerol monolaurate (ML-750) or polyoxyethylene sorbitan monolaurate (Tween 20), was used, fine emulsions with a median oil droplet diameter of 100 nm or less were successfully prepared at ML-750 and Tween 20 concentrations of 0.083% (w/v) and 0.042%, respectively, or higher. The diameters were much smaller than those of oil droplets prepared by the conventional homogenization method using a rotor/stator homogenizer. However, an anionic surfactant, sodium dodecyl sulfate, was not adequate for the preparation of such fine emulsions by the proposed method. Although the interfacial tensions between octanoic acid and the surfactant solutions were measured at different temperatures, they were not an indication for selecting a surfactant for the successful preparation of the fine emulsion by the proposed method.
AB - A novel method for preparing a finely dispersed oil-in-water emulsion is proposed. Octanoic acid dissolved in water at a high temperature of 220 or 230°C at 15 MPa was combined with an aqueous solution of a surfactant and then the mixture was cooled. When a nonionic surfactant, decaglycerol monolaurate (ML-750) or polyoxyethylene sorbitan monolaurate (Tween 20), was used, fine emulsions with a median oil droplet diameter of 100 nm or less were successfully prepared at ML-750 and Tween 20 concentrations of 0.083% (w/v) and 0.042%, respectively, or higher. The diameters were much smaller than those of oil droplets prepared by the conventional homogenization method using a rotor/stator homogenizer. However, an anionic surfactant, sodium dodecyl sulfate, was not adequate for the preparation of such fine emulsions by the proposed method. Although the interfacial tensions between octanoic acid and the surfactant solutions were measured at different temperatures, they were not an indication for selecting a surfactant for the successful preparation of the fine emulsion by the proposed method.
KW - Droplet size
KW - Interfacial tension
KW - Octanoic acid
KW - Oil-in-water emulsion
KW - Subcritical water
UR - http://www.scopus.com/inward/record.url?scp=4143140941&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4143140941&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2004.05.032
DO - 10.1016/j.jcis.2004.05.032
M3 - Article
VL - 278
SP - 192
EP - 197
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -