ISSN:
1435-1536
Keywords:
Ostwald ripening
;
emulsions
;
dynamic light scattering
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The kinetics of aging processes in emulsions of undecane and dodecane stabilized by a surfactant is studied by dynamic light scattering (DLS) and fiber-optics dynamic light scattering (FODLS). It appears that whereas DLS requires extremely diluted clear samples (volume fraction typically 2×10−4) to follow the aging process, FODLS allows to monitor the aging in concentrated (volume fraction 0.2) and extremely turbid emulsions. Quantitative agreement between FODLS and DLS is however only obtained when the aging is followed by FODLS on moderately diluted (volume fraction 0.01) emulsions. For more concentrated emulsions quantitative results from FODLS measurements on undiluted emulsions can only be obtained if prior knowledge about the effect of particle interaction on the measured diffusion coefficient is available. The observed variation of the ripening rates with the alkane volume fraction is in agreement with the theoretical predictions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01188959
Permalink