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Updated: Nov 4, 2025

Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
Published on: October 15, 2015
Hydrodynamic shear dissipation and transmission in lipid bilayers
Guillermo J Amador1,2,3, Dennis van Dijk2, Roland Kieffer2
1Laboratory for Aero and Hydrodynamics, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, Delft 2628 CD, The Netherlands.
This study introduces a new microrheology technique to measure lipid bilayer properties. Ordered lipid bilayers exhibit higher viscosity but lower friction, impacting shear force transmission across cell membranes.
Area of Science:
- Biophysics
- Cell Biology
- Materials Science
Background:
- Cellular lipid membranes, composed of lipid bilayers, are crucial for biological processes.
- These membranes interact mechanically with surrounding fluids, influencing cell function.
- Understanding membrane mechanics is key to cell behavior and homeostasis.
Purpose of the Study:
- To develop and apply a novel microrheology technique for characterizing lipid bilayers.
- To quantify fluid slip and shear transmission across lipid bilayers.
- To investigate the relationship between lipid molecular structure and membrane physical properties.
Main Methods:
- Utilized a noncontact, two-point microrheology technique with multiple optical tweezers.
- Employed planar freestanding lipid bilayers accessible on both sides.
- Combined experimental measurements with numerical simulations to determine viscosity and friction.
Main Results:
- Ordered-phase lipid bilayers are 10-100 times more viscous than liquid disordered-phase bilayers.
- Ordered-phase bilayers exhibit 100 times less intermonolayer friction.
- Ultralow intermonolayer friction leads to complete slip between bilayer leaflets, preventing shear transmission.
Conclusions:
- Lipid bilayer physical properties, including viscosity and intermonolayer friction, are highly dependent on lipid molecular structure.
- The findings elucidate the principles of shear force transfer through lipid membranes.
- This research provides insights into membrane mechanics relevant to cellular processes.
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