Optically probing nanoemulsion compositions

Xiaoming Zhu, Michael M. Fryd, Jung Ren Huang, Thomas G. Mason

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Many types of colloids, including nanoemulsions, which contain sub-100 nm droplets, are dispersed in molecular and micellar solutions, especially surfactant solutions that confer stability. Since it would be desirable to measure the droplet volume fraction and surfactant concentration C of a nanoemulsion non-destructively, and since the droplet and surfactant structures are significantly smaller than the shortest wavelengths of visible light, optical refractometry could provide a simple and potentially useful approach. By diluting a silicone oil-in-water nanoemulsion having an unknown and C with pure water, measuring its refractive index n(,C) using an Abbé refractometer, and fitting the result using a prediction for n that treats the nanoemulsion as an effective medium, we show that and C can be deduced accurately over a relatively wide range of compositions. Moreover, we generalize this approach to other types of nanoemulsions in which a molecular constituent partitions in varying degrees between the dispersed and the continuous phases.

Original languageEnglish
Pages (from-to)2455-2461
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number7
DOIs
Publication statusPublished - 2012 Feb 21

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Surface-Active Agents
Refractometry
surfactants
Chemical analysis
Refractometers
Silicone Oils
refractometers
Water
Colloids
silicones
water
colloids
partitions
Volume fraction
Refractive index
oils
refractivity
Light
Wavelength
predictions

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Optically probing nanoemulsion compositions. / Zhu, Xiaoming; Fryd, Michael M.; Huang, Jung Ren; Mason, Thomas G.

In: Physical Chemistry Chemical Physics, Vol. 14, No. 7, 21.02.2012, p. 2455-2461.

Research output: Contribution to journalArticle

Zhu, Xiaoming ; Fryd, Michael M. ; Huang, Jung Ren ; Mason, Thomas G. / Optically probing nanoemulsion compositions. In: Physical Chemistry Chemical Physics. 2012 ; Vol. 14, No. 7. pp. 2455-2461.
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