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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Published on: February 4, 2013

Gel-based self-propelling particles get programmed to dance.

Rachita Sharma1, Suk Tai Chang, Orlin D Velev

  • 1Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, 27695-7905, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 5, 2012
PubMed
Summary
This summary is machine-generated.

We developed oscillating gel-based particles that move autonomously using the Marangoni effect. These self-propelling particles offer potential for microscale applications like mixers and cargo carriers.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Self-propelling particles are crucial for microscale applications.
  • The Marangoni effect, driven by surface tension gradients, offers a mechanism for autonomous motion.

Purpose of the Study:

  • To present a novel class of gel-based self-propelling particles.
  • To investigate their oscillatory motion mechanism and control capabilities.
  • To explore potential applications in microfluidics and sensing.

Main Methods:

  • Fabrication of ethanol-infused polyacrylamide hydrogel particles within plastic tubing.
  • Observation and measurement of particle propulsion on a water surface.
  • Analysis of ethanol release, buoyancy, and surface tension gradient dynamics.
  • Mathematical approximation of propulsion parameters based on mass transfer rates.

Main Results:

  • Particles exhibit sustained oscillatory propulsion for hours.
  • Ethanol release drives a self-sustained Marangoni effect cycle.
  • Pulsating motion arises from the disruption of ethanol flux by bulk flows.
  • Propulsion characteristics were quantified and modeled.
  • Particles were engineered for programmable complex trajectories.

Conclusions:

  • Gel-based particles can achieve controlled, autonomous motion via the Marangoni effect.
  • The oscillatory propulsion mechanism is linked to ethanol mass transfer.
  • These particles show promise for lab-on-a-chip devices, mixers, and microscale sensing platforms.