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Thermal effect on a viscously deformed liposome in a laser trap
Ji-Jinn Foo1, Kuo-Kang Liu, Vincent Chan
1Tissue Engineering Laboratory, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798.
Annals of Biomedical Engineering
|April 12, 2003
Summary
This study reveals how temperature affects lipid vesicles in fluid flow. Increasing temperature reduces vesicle rigidity and drag, with effects reversing upon cooling, crucial for understanding cell membrane mechanics.
Area of Science:
- Biophysics
- Fluid Dynamics
- Materials Science
Background:
- Lipid bilayers form cell membranes, crucial for cellular function.
- Understanding vesicle mechanics in flow is vital for physiological processes.
- Phase transitions significantly alter membrane properties.
Purpose of the Study:
- To investigate the viscous drag and mechanical deformation of lipid vesicles during phase transitions.
- To quantify the impact of temperature on vesicle biomechanics under hydrodynamic flow.
- To explore the reversibility of these mechanical changes.
Main Methods:
- Utilized optical tweezers experiments to probe vesicle behavior.
- Employed computational fluid dynamics (CFD) simulations for numerical analysis.
- Calculated surface stresses and drag forces based on experimental geometry.
Main Results:
- Vesicle rigidity decreases with increasing temperature during heating.
- Viscous drag force on the vesicle diminishes as temperature rises.
- Observed reversibility of mechanical properties with temperature changes.
- Mechanical properties were found to be dependent on the liposome's phase transition temperature.
Conclusions:
- Highly coupled thermal and hydrodynamics effects influence vesicle biomechanics.
- Provides insights into the behavior of model membrane vesicles in physiological flows.
- Demonstrates the significant role of thermotropic phase transitions in membrane mechanics.