Depletion-Induced Flocculation of Concentrated Emulsions Probed by Photon Density Wave Spectroscopy.
Langmuir
; 36(13): 3504-3513, 2020 Apr 07.
Article
en En
| MEDLINE
| ID: mdl-32162925
ABSTRACT
Stable, creaming-free oil in water emulsions with high volume fractions of oil (Ï = 0.05-0.40, density matched to water) and polysorbate 80 as an emulsifier were characterized without dilution by Photon Density Wave spectroscopy measuring light absorption and scattering behavior, the latter serving as the basis for droplet size distribution analysis. The emulsion with Ï = 0.10 was used to investigate flocculation processes induced by xanthan as a semi-flexible linear nonabsorbing polymer. Different time regimes in the development of the reduced scattering coefficient µs' could be identified. First, a rapid, temperature-dependent change in µs' during the depletion process was observed. Second, the further decrease of µs' follows a power law in analogy to a spinodal demixing behavior, as described by the Cahn-Hilliard theory.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Langmuir
Asunto de la revista:
QUIMICA
Año:
2020
Tipo del documento:
Article
País de afiliación:
Alemania