Electrodeformation of Vesicles Suspended in a Liquid Medium

Area of Science:

• Biophysics
• Fluid Dynamics
• Computational Modeling

Background:

• Flexible vesicles in electric fields exhibit complex deformation dynamics.
• Understanding these dynamics is crucial for microscale biophysics and fluid mechanics.
• Vesicle membrane behavior is influenced by electrical properties and applied fields.

Purpose of the Study:

• To investigate the electrodeformation of flexible vesicles under a direct current (DC) electric field.
• To analyze the influence of vesicle size, electric field strength, and conductivity ratios on deformation.
• To explore the resulting fluid flow patterns and membrane mechanics.

Main Methods:

• Utilized an immersed interface method to solve for the electric field.
• Employed an immersed boundary method to simulate fluid flow, membrane mechanics, and vesicle deformation.
• Conducted initial force analysis on the vesicle membrane surface.

Main Results:

• Vesicle size showed a near-linear effect on initial forces but did not influence long-term deformation.
• Highly nonlinear responses were observed with respect to applied electric field strength and conductivity ratios.
• Deformation followed a linear regime transitioning to an equilibrium stage.
• Electrodeforming vesicles generated unique external flows dependent on conductivity ratios.
• Initial vesicle aspect ratio significantly affected force distribution across various conductivity ratios.

Conclusions:

• The study provides a detailed computational model for vesicle electrodeformation.
• Results align with experimental observations regarding vesicle size and long-term deformation.
• The findings highlight the complex interplay between electrical properties and mechanical responses in flexible vesicles.