Microrheometric study of damage and rupture of capsules in simple shear flow

Capsules, which are potentially active fluid droplets enclosed in a thin elastic membrane, experience large deformations when placed in suspension. The induced fluid–structure interaction stresses can potentially lead to rupture of the capsule membrane. While numerous experimental studies have focus...

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Bibliographic Details
Published in:Journal of fluid mechanics 2024-12, Vol.1000
Main Authors: El Mertahi, C., Grandmaison, N., Dupont, C., Jellali, R., Brancherie, D., Salsac, A.-V.
Format: Article
Language:English
Subjects:
Albumins
Damage detection
Deformation
Elastic deformation
Engineering Sciences
Fluid flow
Fluid-structure interaction
Glycerol
JFM Rapids
Mechanical properties
Membranes
Microcapsules
Ovalbumin
Rheological properties
Rupture
Rupturing
Shear flow
Shear modulus
Size distribution
Vegetable oils
Viscosity
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Summary:Capsules, which are potentially active fluid droplets enclosed in a thin elastic membrane, experience large deformations when placed in suspension. The induced fluid–structure interaction stresses can potentially lead to rupture of the capsule membrane. While numerous experimental studies have focused on the rheological behaviour of capsules until rupture, there remains a gap in understanding the evolution of their mechanical properties and the underlying mechanisms of damage and breakup under flow. We here investigate the damage and rupture of bioartificial microcapsules made of ovalbumin reticulated with terephthaloyl chloride and placed in simple shear flow. We characterize damage by identifying how the surface shear modulus of the capsule membrane changes over time. Rupture is then characterized by comparing the number and size distribution of capsules before and after exposure to shear, while varying the shear rates and time during which capsules are sheared. Our findings reveal how the percentage of ruptured capsules increases with their size, exposure time to shear, and the ratio of viscous to elastic forces at rupture.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2024.952