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Adhesion of membranes via switchable molecules
Bartosz Rózycki1, Thomas R Weikl, Reinhard Lipowsky
1Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany.
Summary
This study explores biomimetic membranes with switchable crosslinkers. Active shape fluctuations, induced by external stimuli, increase membrane roughness, challenging the concept of effective temperature.
Area of Science:
- Materials Science
- Biophysics
- Soft Matter Physics
Background:
- Biomimetic membranes are crucial for advanced materials.
- Switchable crosslinkers enable dynamic control over membrane properties.
- Understanding membrane-substrate interactions is key for applications.
Purpose of the Study:
- To theoretically investigate biomimetic membranes with switchable crosslinkers.
- To analyze how molecular conformation changes affect membrane roughness.
- To explore the relationship between active fluctuations and membrane dynamics.
Main Methods:
- Analytical methods were employed for theoretical analysis.
- Monte Carlo simulations were utilized to model membrane behavior.
- Membrane roughness was calculated as a function of transition rates and fraction of states.
Main Results:
- Flexible crosslinkers exhibit two conformations, influencing membrane-substrate separation.
- External stimuli (light, potential, pH) induce conformational transitions and active shape fluctuations.
- Increased membrane roughness was observed due to these active fluctuations.
Conclusions:
- The interplay between active and thermal fluctuations is complex.
- Active fluctuations in biomimetic membranes cannot generally be described by an effective temperature.
- This research provides insights into dynamic control of membrane surface properties.