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 18.10.2008   Карта сайта     Language По-русски По-английски
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18.10.2008

Double phase inversion of emulsions stabilized by a mixture of CaCO3 nanoparticles and sodium dodecyl sulphate




Z.-G. Cuia, Corresponding Author Contact Information, E-mail The Corresponding Author, K.-Z. Shia, Y.-Z. Cuia and B.P. Binksb





aSchool of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, PR China bSurfactant and Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, UK




Received 28 March 2008; 


revised 17 June 2008; 


accepted 22 June 2008. 


Available online 9 July 2008.








Abstract


The interaction between unmodified CaCO3 nanoparticles and sodium dodecyl sulphate (SDS) in aqueous solution and the subsequent emulsification of the mixed dispersions are studied by means of zeta potential measurements, adsorption and emulsion characterization. Using toluene or octane as oil phase, hydrophilic CaCO3 nanoparticles stabilize only temporarily oil-in-water, O/W, emulsions. Upon the addition of trace amounts of SDS in the aqueous phase, the stability of the emulsions is greatly improved. Further increasing the SDS concentration results in a double phase inversion, O/W(1) to water-in-oil, W/O to O/W(2). It is suggested that the adsorption of SDS molecules on particle surfaces rendering them hydrophobic induces the first inversion. When the adsorption of SDS reaches a maximum, the surface of the particles are re-converted to hydrophilic due to a surfactant bilayer, and the equilibrium concentration of SDS in the continuous phase is high enough to stabilize a water continuous emulsion, promoting the second phase inversion. The O/W(2) emulsions however, are in general unstable, due to flocculation and sedimentation of the particles.





Keywords: CaCO3 nanoparticles; SDS; Pickering emulsion; Phase inversion; Adsorption





Article Outline



1. Introduction
2. Experimental details

2.1. Materials
2.2. Methods

2.2.1. Dispersing CaCO3 nanoparticles in aqueous media
2.2.2. Particle size and zeta potential of CaCO3 nanoparticles dispersed in aqueous media
2.2.3. Preparation and characterisation of emulsions
2.2.4. Measurement of adsorption isotherm of SDS on CaCO3 nanoparticles in water

3. Results and discussion

3.1. Characterization of CaCO3 nanoparticles
3.2. Emulsions stabilized solely by CaCO3 nanoparticles
3.3. Double phase inversion induced by interaction with SDS
3.4. O/W(2) emulsions stabilized by CaCO3 nanoparticles and high concentrations of SDS

4. Conclusions
Acknowledgements
References











































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