Journal
LANGMUIR
Volume 32, Issue 13, Pages 3174-3185Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.6b00271
Keywords
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Funding
- National Natural Science Foundation of China [U1302271, 91334201]
- Foundation for the Author of National Excellent Doctoral Dissertation of the People's Republic of China (FANEDD) [201349]
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Varied interfacial tension caused by the unsaturated adsorption of surfactants on dripping droplet surfaces is experimentally studied. The mass transfer and adsorption of surfactants, as well as the generation of fresh interfaces, are considered the main factors dominating the surfactant adsorption ratio on droplet surfaces. The diffusion and convective mass transfer of the surfactants are first distinguished by comparing the adsorption depth and the mass flux boundary layer thickness. A characterized mass transfer time is then calculated by introducing an effective diffusion coefficient. A time ratio is furthermore defined by dividing the droplet generation time by the characteristic mass transfer time, t/t(m), in order to compare the rates of surfactant mass transfer and droplet generation. Different control mechanisms for different surfactants are analyzed based on the range of t/t(m) and a criterion time ratio using a simplified characteristic mass transfer time, t(m)*, is finally proposed for predicting the appearance of dynamic interfacial tension.
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