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Adhesion induced by mobile binders: dynamics
F Brochard-Wyart1, Pierre-Gilles de Gennes
1PCC Institute Curie, 11 Rue P. et M. Curie, 75005 Paris, France.
Summary
This study models molecular binding to surfaces, revealing that lag forces are ineffective during spontaneous patch growth. Detailed predictions for growth laws in this specific scenario are provided.
Area of Science:
- Biophysics
- Surface Science
- Adhesion Dynamics
Background:
- Vesicle bilayers interact with solid surfaces via molecular binders.
- Contact area dynamics are crucial for understanding adhesion forces.
- Binder diffusion and dissipation influence the contact line's behavior.
Purpose of the Study:
- To investigate the role of binder diffusion and lag forces in vesicle-surface interactions.
- To identify conditions where lag forces become ineffective.
- To predict growth laws for spontaneous adhesive patch formation.
Main Methods:
- Utilizing the Bell, Dembo, and Bongrand model for molecular binding.
- Analyzing time-varying contact areas with diffusing binders.
- Developing theoretical predictions for growth dynamics.
Main Results:
- Lag forces, arising from dissipation and diffusion, retard the contact line.
- Lag forces are ineffective during adhesive patch shrinking (Evans tear out).
- Lag forces are weak during spontaneous patch growth from a point contact.
Conclusions:
- Binder diffusion and dissipation create lag forces impacting adhesion experiments.
- Spontaneous patch growth from a point contact is a key scenario where lag forces are negligible.
- This work provides theoretical growth laws for spontaneous adhesive patch formation.