Oil Droplet Coalescence in W/O/W Double Emulsions Examined in Models from Micrometer- to Millimeter-Sized Droplets

Running title: Activation energy for coalescence of oil droplets Note Effect of Oil-droplet Size on Activation Energy for Coalescence of Oil Droplets in an O/W Emulsion

Right This is an Accepted Manuscript of an article published by Taylor & Francis in 'Bioscience, Biotechnology, and Biochemistry' on 12 May 2015, available online: http://www.tandfonline.com/10.1080/09168451.2015.1039482. ; The full-text file will be made open to the public on 12 May 2016 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.; This is not the published versio...

Non-coalescence of oppositely charged droplets in pH-sensitive emulsions.

Like charges stabilize emulsions, whereas opposite charges break emulsions. This is the fundamental principle for many industrial and practical processes. Using micrometer-sized pH-sensitive polymeric hydrogel particles as emulsion stabilizers, we prepare emulsions that consist of oppositely charged droplets, which do not coalesce. We observe noncoalescence of oppositely charged droplets in bul...

Stimulated Raman scattering in micrometer-sized droplets: time-resolved measurements.

Time-resolved measurements of elastic scattering and stimulated Raman scattering (SRS) in micrometer-sized water and carbon tetrachloride droplets irradiated with a pulsed, frequency-doubled Nd:YAG laser (pulse width 8 nsec, lambda = 532 nm, peak intensity ~1 GW cm(-2)) are reported. Elastic scattering of light is instantaneous within our measurement error, estimated to be <+/-3 nsec. On the ot...

Electro-Coalescence of an Aqueous Droplet at an Oil–Water Interface with an Investigation of Secondary Droplets Formation

Effect of oil droplet size on activation energy for coalescence of oil droplets in an O/W emulsion.

The activation energy of a reasonable order of magnitude was estimated for the coalescence of oil droplets in an O/W emulsion by formulating the balance of forces acting on a droplet that crosses over the potential barrier to coalesce with another droplet by the DLVO theory and Stokes' law. An emulsion with smaller oil droplets was shown to be more stable.