Extreme emulsification: formation and structure of nanoemulsions

• Published in: Condensed Matter Physics
• Date: 2006
• Main Authors: Mason, T.G., Graves, S.M., Wilking, J.N., Lin, M.Y.
• Format: Article
• Language: English
• Published: Інститут фізики конденсованих систем НАН України 2006
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/121314
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Extreme emulsification: formation and structure of nanoemulsions / T.G. Mason, S.M. Graves, J.N. Wilking, M.Y. Lin // Condensed Matter Physics. — 2006. — Т. 9, № 1(45). — С. 193–199. — Бібліогр.: 17 назв. — англ.

Nanoemulsions are metastable dispersions of nanodroplets of one liquid that have been ruptured by shear in
 another immiscible liquid. The ruptured droplets are stabilized against subsequent coalescence by a surfactant.
 Because the nanodroplets do not form spontaneously, as they can in lyotropic “microemulsion” phases,
 the structure of nanoemulsions is primarily dependent on the history of the applied shear stresses relative to
 the interfacial restoring stresses. By applying extremely high shear rates and controlling the composition of
 the emulsion, we have been able to rupture microscale droplets down to diameters as small as 30 nm in a
 microfluidic process that yields bulk quantities suitable for commercial production. Following ultracentrifugal
 fractionation to make the droplets uniform, we study the structure of these emulsions using small angle neutron
 scattering (SANS) at dilute and concentrated volume fractions. We contrast the structure of a concentrated
 nanoemulsion with the structure factor of hard spheres at a similar volume fraction.