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A microfluidic actuator based on a stimuli-responsive hydrogel grafted into Cucurbita moschata xylems
Marcelo R Romero1, Gisella Trejo Nieva1, José Vedelago2
1Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Química Orgánica, Córdoba, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada (IPQA), Edificio de Ciencias II, Haya de la Torre y Medina Allende, (5000), Córdoba, Argentina. marceloricardoromero@gmail.com.
Researchers created a smart hydraulic valve using plant stems and pH-responsive polymers. This bio-inspired actuator controls fluid flow, opening and closing based on pH changes.
Area of Science:
- Biomaterials Engineering
- Plant Science
- Chemical Engineering
Background:
- Plant stem microstructures offer unique properties for bio-inspired engineering.
- Developing intelligent actuators with tunable responses is crucial for advanced applications.
- pH-responsive polymers can be utilized to create smart materials for controlled systems.
Purpose of the Study:
- To develop a novel chemical actuator for hydraulic valve applications.
- To chemically modify plant stem xylems with pH-responsive polymers.
- To evaluate the performance of the bio-actuator under varying pH and pressure conditions.
Main Methods:
- Utilized Cucurbita moschata stem xylems as biological scaffolds.
- Grafted a pH-sensitive hydrogel (acrylic acid copolymer) onto inner stem microchannels.
- Assessed physicochemical properties and actuator response using pressure and pH variations.
- Estimated microcapillary diameter changes using Poiseuille's model.
Main Results:
- The developed microfluidic device exhibited pH-responsive properties and efficient flux control.
- An open/close transition of the hydraulic valve was observed at pH 3.25.
- The actuator demonstrated mechanical stability up to 1.75 meters of water column (mH₂O).
- The actuator showed reliable response to open/close cycling.
Conclusions:
- Chemically modified plant stems can function as effective pH-responsive hydraulic valves.
- This bio-inspired actuator has potential applications in aqueous systems requiring pH-controlled flow.
- The study highlights the potential of integrating biological scaffolds with synthetic polymers for advanced technological demands.
