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Statistical Mechanics Approach to DNA-Driven Droplet Deformation and Adhesion
Nicolas Judd1, Angus McMullen1, Sascha Hilgenfeldt2
1New York University, Center for Soft Matter Research, New York, New York 10003, USA.
Physical Review Letters
|February 21, 2025
Summary
This study reveals how DNA-coated droplets bind, showing a shape transition at specific DNA coverage. The weak binding strength is due to entropic costs, guiding future material design.
Area of Science:
- Soft matter physics
- Biophysics
- Colloidal science
Background:
- Particle adhesion is crucial for self-assembly, vesicle binding, and biological tissue organization.
- Understanding the principles governing soft particle interactions is key to controlling these processes.
Purpose of the Study:
- To develop and experimentally validate an equilibrium theory for the adhesion of DNA-coated emulsion droplets.
- To identify the factors influencing droplet binding and shape transitions.
Main Methods:
- Derivation of an equilibrium theory for DNA-mediated droplet adhesion.
- Experimental testing using DNA-coated emulsion droplets.
- Analysis of binding transitions and effective binding strength.
Main Results:
- Identified a transition from spherical to deformed droplet binding based on DNA coverage.
- Determined that this transition depends on molecular properties and surface tension.
- Quantified a weak effective binding strength (3.7±0.3 KBT) attributed to entropic costs.
Conclusions:
- The developed theory accurately captures DNA-coated droplet adhesion.
- Entropic effects significantly reduce the effective binding strength.
- Findings provide a foundation for designing materials by tuning molecular parameters.
