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Hydrogel micromotors with catalyst-containing liquid core and shell.

Hong Zhu1, Saraf Nawar2, Jörg G Werner2

  • 1Department of Materials Science, 220 Handan Road, Fudan University, Shanghai 200433, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 20, 2019
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Summary
This summary is machine-generated.

Researchers developed self-propelling hydrogel micromotors using microfluidics. These dynamic microcapsules offer enhanced capabilities for molecular separation and purification, advancing micro-reactor applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Methacrylic anhydride hydrogel microcapsules exhibit tunable permeation for molecular separation.
  • Autonomous motion is crucial for enhancing the efficiency and applicability of microcapsule systems.
  • Integrating dynamic motion into hydrogel microcapsules opens new avenues for micro-scale applications.

Purpose of the Study:

  • To engineer hydrogel micromotors capable of autonomous motion.
  • To explore different strategies for creating catalytically active hydrogel micro-machines.
  • To demonstrate the propulsion mechanism and dynamic behaviors of these novel micromotors.

Main Methods:

  • Fabrication of hydrogel microcapsules and microparticles using glass capillary microfluidics and photopolymerization.
  • Creation of water-in-oil-in-water and oil-in-water emulsions for diverse micromotor designs.
  • Utilizing catalytic layers (Pt, Ti/Pt) and hydrogen peroxide solutions to generate propulsion via oxygen microbubbles.

Main Results:

  • Successful realization of autonomous motion in hydrogel microcapsules and microparticles.
  • Demonstration of three distinct hydrogel micromotor designs: liquid-cored, water-cored, and homogeneous particles.
  • Observation of micromotor propulsion in hydrogen peroxide, driven by microbubble generation.

Conclusions:

  • Hydrogel micromotors propelled by microbubbles offer a novel approach to dynamic micro-scale systems.
  • These micromotors exhibit unique autonomous behaviors, extending the dynamic response range of hydrogels.
  • Drop-based microfluidics facilitates high-throughput design of chemical micromachines for biomedical, environmental, and microreactor applications.