Issue 2, 2011

Water-in-oil-in-water double nanoemulsion induced by CO2

Abstract

The cetyltrimethylammonium bromide (CTAB)/water/heptane emulsion system with different CO2 pressure has been studied. The phase behavior investigation shows the nanoemulsion can be formed at suitable pressure range. The generalized indirect Fourier transformation (GIFT) analysis of the small-angle X-ray scattering (SAXS) data has drawn a clear picture of the structural information of the nanoemulsion, which reveals that the droplet of emulsion has a double structure with both the outer and inner droplet size in nanometre range. Furthermore, the investigation of the heptane/CTAB/water/CO2 emulsion system by using electrical conductivity confirms the emulsion type transforms from O/W to W/O/W. In addition, the effect of different CTAB concentration on the nanoemulsion formation has been studied. It is found that enough CTAB concentration is necessary for the inclusion of continuous water into oil droplets. We also explored the application of the W/O/W double nanoemulsion in material synthesis. Interestingly, the hollow silica spheres with double shells were obtained in this CO2-induced double nanoemulsion.

Graphical abstract: Water-in-oil-in-water double nanoemulsion induced by CO2

Article information

Article type
Paper
Submitted
13 Jun 2010
Accepted
22 Sep 2010
First published
29 Oct 2010

Phys. Chem. Chem. Phys., 2011,13, 684-689

Water-in-oil-in-water double nanoemulsion induced by CO2

Y. Zhao, J. Zhang, Q. Wang, J. Li and B. Han, Phys. Chem. Chem. Phys., 2011, 13, 684 DOI: 10.1039/C0CP00869A

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