TY  - JOUR
A1  - Bressel, Katharina
A1  - Müller, Wenke
A1  - Leser, Martin Erwin
A1  - Reich, Oliver
A1  - Hass, Roland
A1  - Wooster, Tim J.
T1  - Depletion-induced flocculation of concentrated emulsions probed by photon density wave spectroscopy
JF  - Langmuir
N2  - Stable, creaming-free oil in water emulsions with high volume fractions of oil (phi = 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 phi = 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 mu(s)' could be identified. First, a rapid, temperature-dependent change in mu(s)' during the depletion process was observed. Second, the further decrease of mu(s)' follows a power law in analogy to a spinodal demixing behavior, as described by the Cahn-Hilliard theory.
Y1  - 2020
U6  - https://doi.org/10.1021/acs.langmuir.9b03642
SN  - 0743-7463
VL  - 36
IS  - 13
SP  - 3504
EP  - 3513
PB  - American Chemical Society
CY  - Washington
ER  -