Shape Transformations of Vesicles Induced by Their Adhesion to Flat Surfaces

Area of Science:

• Biophysics
• Soft Matter Physics
• Materials Science

Background:

• Lipid vesicles are fundamental in biological systems and nanotechnology.
• Their shape is influenced by membrane properties and external interactions.
• Understanding adhesion-induced shape changes is crucial for various applications.

Purpose of the Study:

• To investigate the shape transformations of lipid vesicles upon adhesion to a flat surface.
• To determine the stability of different vesicle shapes (oblate, prolate, stomatocyte) when adhered.
• To identify novel physical phenomena arising from vesicle-surface adhesion.

Main Methods:

• Utilizing the Helfrich spontaneous curvature model for theoretical calculations.
• Performing simulations for specific values of reduced volume and spontaneous curvature.
• Analyzing the energetic landscape to predict stable vesicle morphologies.

Main Results:

• Established the range of stability for oblate, prolate, and stomatocyte shapes of adhered vesicles.
• Identified critical parameters influencing the shape transitions.
• Observed and reported new phenomena, including adhesion-induced budding.

Conclusions:

• Adhesion to flat surfaces significantly alters lipid vesicle morphology.
• The Helfrich model provides a framework to predict shape stability and transitions.
• Vesicle budding can be triggered by surface adhesion, revealing complex physical behaviors.