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Reconfigurable Droplet-Droplet Communication Mediated by Photochemical Marangoni Flows
Anne-Déborah C Nguindjel1, Stan C M Franssen1, Peter A Korevaar1
1Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, Nijmegen 6525 AJ, The Netherlands.
Journal of the American Chemical Society
|February 23, 2024
Summary
Researchers created self-assembling droplet networks that communicate using chemical signals. Inspired by slime mold, this system uses light to control droplet connections for applications in adaptive matter and computing.
Area of Science:
- Soft Matter Physics
- Chemical Engineering
- Biomimicry
Background:
- Droplets are versatile building blocks for dynamic and adaptive structures.
- Inter-droplet communication is crucial for emergent behaviors in systems like slime mold (Physarum polycephalum).
- Current methods for controlling droplet interactions are limited.
Purpose of the Study:
- To develop a method for chemical signal transfer among droplets at an air-water interface.
- To mimic decentralized communication observed in slime mold using synthetic components.
- To establish reconfigurable and self-organizing droplet networks.
Main Methods:
- Utilized surfactants (triethylene glycol monododecylether, C12E3) to form self-assembled wires (myelins) connecting droplets.
- Developed a photocontrolled Marangoni flow strategy using photoacid generators and oleic acid/sodium oleate (OA/NaO) droplets.
- Directed myelin trajectories via localized UV exposure to trigger coating disintegration and surface tension gradients.
- Demonstrated chemical signal transfer (fluorescent dyes) through regulated myelin connections.
Main Results:
- Successfully directed the self-assembly of C12E3 myelins towards photoactive OA/NaO droplets using UV light.
- Established reconfigurable connections between droplets, enabling self-organization of the network.
- Showcased selective delivery of fluorescent dyes within droplets via photochemical control of myelin interactions.
- Demonstrated a novel form of communication in synthetic droplet systems.
Conclusions:
- This work presents a novel approach for light-controlled communication and self-organization in droplet-based systems.
- The developed method allows for dynamic and reconfigurable connections, opening possibilities for adaptive matter and protocell research.
- The biomimetic strategy provides a foundation for designing complex, communicating soft matter systems.
