TY - JOUR
T1 - Dynamics of Droplet Pinch-Off at Emulsified Oil-Water Interfaces
T2 - Interplay between Interfacial Viscoelasticity and Capillary Forces
AU - Bazazi, Parisa
AU - Stone, Howard A.
AU - Hejazi, S. Hossein
N1 - Funding Information:
This study was financially funded by Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant No. RGPIN/07186-2019, University of Calgary’s Canada First Research Excellence Fund (CFREF) program, and the Global Research Initiative (GRI) in Sustainable Low Carbon Unconventional Resources. We also gratefully acknowledge infrastructure funding from Canadian Foundation for Innovation (CFI) CFI JELF 33700. P. B. appreciates Alberta Innovates and the University of Calgary Eyes High Graduate Student Scholarships.
Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/1/20
Y1 - 2023/1/20
N2 - The presence of submicrometer structures at liquid-fluid interfaces modifies the properties of many science and technological systems by lowering the interfacial tension, creating tangential Marangoni stresses, and/or inducing surface viscoelasticity. Here we experimentally study the break-up of a liquid filament of a silica nanoparticle dispersion in a background oil phase that contains surfactant assemblies. Although self-similar power-law pinch-off is well documented for threads of Newtonian fluids, we report that when a viscoelastic layer is formed in situ at the interface, the pinch-off dynamics follows an exponential decay. Recently, such exponential neck thinning was found theoretically when surface viscous effects were taken into account. We introduce a simple approach to calculate the effective relaxation time of viscoelastic interfaces and estimate the thickness of the interfacial layer and the viscoelastic properties of liquid-fluid interfaces, where the direct measurement of interfacial rheology is not possible.
AB - The presence of submicrometer structures at liquid-fluid interfaces modifies the properties of many science and technological systems by lowering the interfacial tension, creating tangential Marangoni stresses, and/or inducing surface viscoelasticity. Here we experimentally study the break-up of a liquid filament of a silica nanoparticle dispersion in a background oil phase that contains surfactant assemblies. Although self-similar power-law pinch-off is well documented for threads of Newtonian fluids, we report that when a viscoelastic layer is formed in situ at the interface, the pinch-off dynamics follows an exponential decay. Recently, such exponential neck thinning was found theoretically when surface viscous effects were taken into account. We introduce a simple approach to calculate the effective relaxation time of viscoelastic interfaces and estimate the thickness of the interfacial layer and the viscoelastic properties of liquid-fluid interfaces, where the direct measurement of interfacial rheology is not possible.
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U2 - 10.1103/PhysRevLett.130.034001
DO - 10.1103/PhysRevLett.130.034001
M3 - Article
C2 - 36763387
AN - SCOPUS:85147192379
SN - 0031-9007
VL - 130
JO - Physical Review Letters
JF - Physical Review Letters
IS - 3
M1 - 034001
ER -