How can you characterize the stern layer on emulsifier free emulsions and measure its thickness? This emulsion was stabilized by electrostatic repulsion.
If you mean experimentally, for me the most detailed technique is this one: http://www.sciencedirect.com/science/article/pii/S0927775707007145
Dielectric dispersion is also useful, cf. Dukhin and Shilov works. It's applied on emulsion (the previous method is for a film, the next is for droplet).
If you make the oil a conductor by some oil-soluble electrolyte, you can use the classics - polarography. The double layer at water oil was studied by Watanabe et al., search for Electrocapillary Phenomena at Oil-Water Interfaces.
But it will be a lot of job.
Dear, Messaouda, after taking my PhD in physical Chemistry, I got a position at the Institute for Surface- and Interface Science in Stockholm. Professor Per Claesson is there running studies by Surface Force Instruments, which are able to measure forces at Surfaces, at angstom distances. the technique is well established since 30 years.These instruments are also present at other places in the world. They would be perfect for your interst, conveniently measuring e g Stern layers. / Johan Carlfors at : www.ontargetchemistry.com , Uppsala, Sweden.
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