Dual-Stimulus-Responsive Liquid Marbles with Programmable Motion on Liquid and Hydrogel Surfaces

Area of Science:

• Soft Matter Physics
• Materials Science
• Nanotechnology

Background:

• Liquid marbles (LMs) are gaining attention for their programmable nature.
• Controlling LM locomotion typically requires single stimuli, limiting their application.
• Developing multi-stimulus responsive systems is crucial for advanced functionalities.

Purpose of the Study:

• To conceptualize and implement a novel dual-stimulus-responsive liquid marble (LM) platform.
• To achieve controllable locomotion of LMs using near-infrared (NIR) light and magnetic fields.
• To explore the combined actuation capabilities of LMs under external stimuli.

Main Methods:

• Fabrication of LMs using hydrophobic polypyrrole (SPP) particles and hydrophobic magnetic nanoparticles (F-MNP).
• Utilizing ferrofluid (FF) as the core liquid for magnetic responsiveness.
• Investigating locomotion behavior induced by NIR light (Marangoni flows) and magnetic fields.

Main Results:

• Demonstrated controllable locomotion of LMs under NIR irradiation, magnetic actuation, and combined stimuli.
• Observed asymmetric interfacial stress gradients driving locomotion.
• Analyzed the impact of particle type, magnetic field, and NIR exposure on LM movement.

Conclusions:

• The developed dual-stimulus-responsive LMs exhibit programmable locomotion.
• This platform integrates multiple stimuli (NIR light and magnetic fields) for enhanced control.
• Potential applications in smart actuation systems and micro-robotics.