Electrohydrodynamics of Vesicles and Capsules.

Area of Science:

• Biophysics
• Soft Matter Physics
• Materials Science

Background:

• Giant unilamellar vesicles (GUVs) and elastic capsules serve as valuable biomimetic models for biological cells like erythrocytes and leukocytes.
• Understanding the electromechanical response of these structures is crucial for applications in cell biology and materials science.

Purpose of the Study:

• To compare and contrast the electrohydrodynamics (EHD) of vesicles and capsules when subjected to electric fields.
• To illustrate the physics of EHD through various electrodeformation scenarios and discuss their relevance and challenges.

Main Methods:

• Analysis of electrohydrodynamics (EHD) principles governing vesicle and capsule behavior in electric fields.
• Examination of electrodeformation phenomena for single and compound, spherical and cylindrical, charged and uncharged structures.
• Review of applications including interfacial kinetics, synthesis of nonspherical capsules, and large deformation of water-in-water capsules.

Main Results:

• Detailed discussion of both small and large deformation responses of vesicles and capsules under uniform and nonuniform electric fields.
• Insights into the role of EHD in understanding complex interfacial kinetics within capsules.
• Demonstration of electric field-induced synthesis of nonspherical capsules and analysis of water-in-water capsule deformation.

Conclusions:

• Electrohydrodynamics provides a powerful framework for understanding the electromechanical responses of biomimetic vesicles and capsules.
• EHD phenomena are relevant for applications ranging from fundamental biophysics to the synthesis of novel capsule structures.
• The constitutive laws governing capsule response are critical for predicting behavior under large deformations.