Deformation and bursting of nonspherical polysiloxane microcapsules in a spinning-drop apparatus

Husmann, Martin; Rehage, Heinz; Dhenin, Emmanuelle; Barthès-Biesel, Dominique

doi:10.1016/j.jcis.2004.08.129

Cited by 46 publications

(56 citation statements)

References 24 publications

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“…To know whether the deformations are elastic or not, we plotted the capsule deformation, for a given Ca, with respect to time as shown in the insets of the in OTS concentration in agreement with literature. 18,23,44,45 Within the limits of experimental error, the E s values obtained from this method were in reasonably good agreement with the values found than the literature obtained from different methods.…”

Section: B Estimation Of Elasticity Using Electrodeformationsupporting

confidence: 86%

“…11,14,43,44 To conduct experiments on equilibrium deformation by circumventing the multilayer formation and realize capsules with well formed equilibrated networks, the following protocol was followed: OTS was first thoroughly dissolved in silicone oil (380 cSt) and water droplets of different sizes were added to this mixture using a syringe. The water droplets were kept in silicone oil for 5-10 min.…”

Section: A Polysiloxane Microcapsule Synthesis and Network Formationmentioning

confidence: 99%

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Deformation of an elastic capsule in a uniform electric field

2014

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The deformation of a thin elastic capsule subjected to a uniform electric field is investigated in the Stokes flow regime. The electrohydrodynamic flow is analyzed using a perfect conductor and a perfect dielectric model for the capsule and the fluid phase, respectively. A theoretical analysis is carried out using an asymptotic expansion in the electric capillary number (Ca) (a ratio of the electric stress to the elastic tension) in the small deformation limit using the finite deformation Hooke's law. The analysis is used to determine the elasticity of polysiloxane capsules suspended in oil, the deformation of which is obtained using videography. The boundary element method is implemented to seek numerical solutions to the hydrodynamic, elastic, and electrostatics equations. The finite deformation Hooke's law, the Mooney-Rivlin, and Skalak's model for elasticity are employed. The effect of electric capillary number, unstressed geometry, and the type of membrane material on the deformation of a capsule is presented in the high Ca number limit using numerical simulation. Capsules synthesized with higher monomer concentration displayed electric stress induced wrinkling process at high electric field strengths. Burst of a capsule is characterized by poration of the polymer membrane, which could be symmetric or asymmetric at the two poles, depending upon the value of the capillary number. The results should be useful in understanding the response of elastic capsules such as red blood cells and polymerized membranes, to an electric field, in applications such as electrodeformation and electroporation. It also provides a theoretical framework for a possible way of determining the elastic parameters of a capsule. C 2014 AIP Publishing LLC. [http://dx.

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Section: B Estimation Of Elasticity Using Electrodeformationsupporting

confidence: 86%

Section: A Polysiloxane Microcapsule Synthesis and Network Formationmentioning

confidence: 99%

Deformation of an elastic capsule in a uniform electric field

2014

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“…Other measurements must be carried out for a better identification of the wall mechanics. Among such methods, one may cite spinning a capsule [10,11] or observing the capsule deformation under flow [3][4][5][6][7][8][9].…”

Section: Resultsmentioning

confidence: 99%

“…However sophisticated models of the mechanics of a capsule in shear flow [6][7][8][9] are needed to relate the observed deformation to the membrane mechanical properties. Another method adapted to large capsules consists in subjecting the capsule to centrifugal forces created in a spinning rheometer [10,11]. Again a mechanical model of the capsule deformation is needed to infer the membrane elastic properties from the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Identification of the elastic properties of an artificial capsule membrane with the compression test: Effect of thickness

Rachik¹,

Barthès-Biesel²,

Carin³

et al. 2006

Journal of Colloid and Interface Science

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“…This class represents a wide range of artificial capsules. Experimental findings for biocompatible alginate capsules [3], synthetic polysiloxane [4], and aminomethacrylate capsules [5] compare very well with theoretical models that ignore bending resistance.Current understanding of capsule dynamics at high flow rates is rather limited. Experimental findings have suggested a wealth of possible configurations, including stable steady-state shapes whose edges become rounded, then more extended but still concave (i.e., spindled), and finally cusped as the flow rate increases as shown in Fig.…”

mentioning

confidence: 84%

Spindles, Cusps, and Bifurcation for Capsules in Stokes Flow

Dodson

Dimitrakopoulos

2008

Phys. Rev. Lett.

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Interfacial dynamics of membrane-enclosed fluid volumes in viscous flows is complicated due to the coupling of the fluid dynamics with the membrane properties. Based on computational investigation via our interfacial spectral boundary element algorithm, our study shows that a (strain-hardening) Skalak-type capsule in a planar extensional Stokes flow develops steady-state shapes whose edges from spindled become cusped with increasing flow rate owing to a transition of the edge tensions from tensile to compressive. A bifurcation in the steady-state shapes is also found (i.e., existence of both spindled and cusped edges for a range of high flow rates) by implementing different transient processes, owing to the different evolution of the membrane tensions.

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Deformation and bursting of nonspherical polysiloxane microcapsules in a spinning-drop apparatus

Cited by 46 publications

References 24 publications

Deformation of an elastic capsule in a uniform electric field

Deformation of an elastic capsule in a uniform electric field

Identification of the elastic properties of an artificial capsule membrane with the compression test: Effect of thickness

Spindles, Cusps, and Bifurcation for Capsules in Stokes Flow

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