A phase-field model for solutions of DNA-made particles

Area of Science:

• Biophysics
• Materials Science
• Computational Chemistry

Background:

• DNA nanostars are promising building blocks for advanced materials.
• Understanding their self-assembly and phase behavior is crucial for designing functional nanomaterials.
• Previous models often lack the accuracy to capture complex thermodynamic properties.

Purpose of the Study:

• To develop and validate a phase-field model for investigating phase separation in DNA nanostar systems.
• To accurately capture the thermodynamic properties of self-assembling DNA nanostars using a realistic free-energy functional.
• To explore both one-component and multi-component DNA nanostar systems.

Main Methods:

• Utilized the Cahn-Hilliard equation as the basis for the phase-field model.
• Incorporated a realistic free-energy functional derived from Wertheim theory.
• Performed numerical simulations for one-component and multi-component systems, including mixtures with cross-linkers.

Main Results:

• The model successfully replicates experimental observations of liquid-liquid phase separation in DNA nanostar systems.
• Demonstrated accurate prediction of surface tension variations and structural organization in multi-component systems.
• The Cahn-Hilliard framework proved versatile for complex systems, offering a computationally efficient alternative to detailed simulations.

Conclusions:

• The developed phase-field model provides a robust and predictive framework for studying DNA nanostar self-assembly and phase behavior.
• This approach facilitates the design and understanding of DNA-based materials for nanotechnology and biophysics.
• The model's ability to simulate complex systems opens new avenues for exploring phenomena like liquid-liquid phase separation in cellular environments.