Light-induced macroscopic assembly under dissipative conditions: communication between artificial swimmers

Projektinformationen

brightLINK

ID Finanzhilfevereinbarung: 101107832

DOI

10.3030/101107832

Projekt abgeschlossen

EK-Unterschriftsdatum 13 April 2023

Startdatum 1 September 2023

Enddatum 31 August 2026

Finanziert unter

• Marie Skłodowska-Curie Actions (MSCA)

Gesamtkosten

Keine Daten

EU-Beitrag

€ 265 099,20

Koordiniert durch

UNIVERSITA DEGLI STUDI DI PADOVA
Italy

Periodic Reporting for period 1 - brightLINK (Light-induced macroscopic assembly under dissipative conditions: communication between artificial swimmers)

Berichtszeitraum: 2023-09-01 bis 2025-08-31

Zusammenfassung vom Kontext und den Gesamtzielen des Projekts

How can we build tiny, soft machines that move and coordinate without batteries, wires or complex electronics? This project explores materials that convert light into motion and motion into chemical messages to create simple, life‑like behaviours. The scientific need is two-fold: (i) light‑powered locomotion at small scales, and (ii) ways for soft devices to store, send, and receive information through their environment. These capabilities matter for future lab‑on‑a‑chip, smart surfaces, a top-down approach for controlling chemical reactions, and targeted release systems where devices must work safely, precisely, and with minimal energy.

The project’s objectives are: (1) design and fabricate photo‑responsive soft walkers—miniature structures that bend and walk under controlled light; (2) engineer functional hydrogels that act as a “chemical message bus,” storing and transporting molecules on demand; (3) couple walkers and hydrogels so that motion can trigger, route and time chemical signals across space; and, overall, extract general design rules (materials, geometry, illumination) that others can reuse. During the first phase, we achieved light‑driven walking on surfaces (a walker rather than the initially envisioned swimmer) and established hydrogel thin film platforms for controllable reaction diffusion capabilities.

By turning light into coordinated function at the micro‑ to mesoscale, the project advances soft robotics and responsive materials. Expected impacts include cleaner actuation (light as an external, on‑demand input), programmable communication between devices, and reusable protocols and datasets to accelerate innovation. These outcomes support broader priorities on sustainable, digitised technologies by enabling precise control of materials and processes with low-footprint methods.

Arbeit, die ab Beginn des Projekts bis zum Ende des durch den Bericht erfassten Berichtszeitraums geleistet wurde, und die wichtigsten bis dahin erzielten Ergebnisse

Materials that turn light into motion. We designed and fabricated photo‑responsive liquid crystal elastomer (LCE) micro‑architectures with controlled molecular alignment. Under patterned illumination, these structures bend predictably and walk on planar surfaces. This “walker” behaviour results from deliberate molecular alignment and friction forces, which arise from asymmetries in geometry only upon actuation (from a symmetric "walker" design), and was validated by repeated on/off light cycles and synchrotron‑based X‑ray scattering to confirm alignment.

Design rules through iteration. We explored families of designs (arrays, legged micro‑elements and flat architectures) and mapped how thickness, pillar density, aspect ratio, and illumination conditions affect actuation and net translation. This work produced practical guidelines for achieving motion while avoiding frictional locking and optical attenuation, which are key barriers for soft, free-form, untethered locomotion.

Hydrogels for chemical messaging. In parallel, we created thin‑layer hydrogel platforms that store and transport molecular “messages.” We established quantitative diffusion assays for model cargos and a simple predictive model linking layer thickness and geometry to release profiles. These tools let us time and route chemical signals with minimal energy input.

Fortschritte, die über den aktuellen Stand der Technik hinausgehen und voraussichtliche potenzielle Auswirkungen (einschließlich der bis dato erzielten sozioökonomischen Auswirkungen und weiter gefassten gesellschaftlichen Auswirkungen des Projekts)

What is new. The project delivers a light‑powered, free-form, symmetric soft walker that operates on simple surfaces, plus a materials‑level communication channel where motion triggers and routes chemical signals. The combination—actuation together with the messaging—goes beyond single‑function soft actuators by enabling programmable interactions between units and with their environment.

Why it matters. This approach offers clean, on‑demand control (light as an external, selective input) and a path to distributed behaviours in lab‑on‑a‑chip, smart surfaces, and targeted release systems. The accompanying design rules (geometry/alignment/illumination; friction management; optical access) lower the barrier for others to reproduce and adapt these capabilities.

What is needed for broader uptake.
- Further research: optimise speed, step size and dynamic directionality; expand symmetry‑breaking strategies for swimming; integrate simple feedback for closed‑loop operation.
- Demonstration: package the walker–hydrogel coupling into application‑oriented demonstrators (e.g. surface‑bound sensors, programmable release).
- Standards & reproducibility: share benchmark geometries, illumination parameters and X‑ray‑based alignment metrics to support cross‑lab comparability and regulatory readiness in bio‑adjacent uses.
- Ecosystem links: engage microfluidics, system chemistry, out-of-equilibrium dynamics, and soft‑robotics communities (and relevant partners) to align with market needs, manufacturability, and materials compliance.

Expected impact. By turning light into coordinated, chemical‑aware function at small scales, the project provides building blocks for safer, lower‑footprint technologies where precise control is required but electronics are impractical.

Illustration showing design, fabrication, bending calibration and motile performance of the walker