Solution properties and PGSE-NMR self-diffusion study of C 18:1E10/oil/water system

C. J. Ko, Y. J. Ko, D. M. Kim, Hyun Jin Park

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The microemulsion systems of polyoxyethylene-10-oleyl ether/oil/water have been studied. The medium chain triglycerides (MCT) and retinyl palmitate mixture (1:1, w/w) was solubilized up to 9% w/w at the surfactant concentration of 25% w/w. The lowest phase inversion temperature (PIT) of the microemulsion solutions was about 57°C and showed no phase separation for 6 months at room temperature. The critical micelle concentration (CMC) of polyoxyethylene-10-oleyl ether (C18:1E10) was 1.20×10-5 M at 27°C. The phase behavior and pulsed field gradient NMR data clearly indicate that these microemulsions are discrete oil-in-water (O/W) microemulsions. The self-diffusion coefficient of free retinyl palmitate, MCT and MCT/retinyl palmitate mixture (1:1, w/w) were 1.61×10-10, 2.60×10-10 and 2.59×10 -10 m2 s-1, respectively. The D of free C 18:1E10 was 4.96×10-11 m2 s-1. The relative self-diffusion coefficients of water and oil differed by more than 1 order of magnitude. The hydrodynamic radius (R H) of this oil swollen micelle was calculated as 14 nm at 1% w/w oil concentration (23% w/w C18:1E10, 0.5% w/w MCT, 0.5% w/w retinyl palmitate, 76% w/w water) and increased to 34 nm at 7% w/w oil concentration (23% w/w C18:1E10, 3.5% w/w MCT, 3.5% w/w retinyl palmitate, 70% w/w water).

Original languageEnglish
Pages (from-to)55-63
Number of pages9
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume216
Issue number1-3
DOIs
Publication statusPublished - 2003 Apr 15

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Oils
oils
Microemulsions
Nuclear magnetic resonance
Triglycerides
nuclear magnetic resonance
Water
water
Polyethylene glycols
Ethers
ethers
micelles
diffusion coefficient
temperature inversions
Critical micelle concentration
Micelles
Phase behavior
Surface-Active Agents
Phase separation
Surface active agents

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Solution properties and PGSE-NMR self-diffusion study of C 18:1E10/oil/water system. / Ko, C. J.; Ko, Y. J.; Kim, D. M.; Park, Hyun Jin.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 216, No. 1-3, 15.04.2003, p. 55-63.

Research output: Contribution to journalArticle

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