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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Disintegrating polymer multilayers to jump-start colloidal micromotors.

Marina Fernández-Medina1, Xiaomin Qian, Ondrej Hovorka

  • 1Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus, Denmark. bstadler@inano.au.dk.

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|December 20, 2018
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Summary

Researchers developed pH-triggered disintegrating polymer multilayers for self-propelling swimmers. Homogenously coated swimmers achieved higher velocities than Janus-shaped ones, demonstrating controllable motion in microfluidic channels.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Soft Matter Physics

Background:

  • Colloidal systems with autonomous mobility offer advantages over static particles.
  • Developing efficient self-propulsion mechanisms is crucial for micro- and nanorobotics.
  • Existing methods often face limitations in biocompatibility or control.

Purpose of the Study:

  • To introduce a novel self-propulsion mechanism for swimmers using pH-triggered disintegrating polymer multilayers.
  • To investigate the influence of swimmer geometry (homogeneous vs. Janus) on propulsion velocity.
  • To explore the effects of environmental factors (pH gradient) and swimmer properties (multilayer count, mass) on self-propulsion.

Main Methods:

  • Fabrication of swimmers coated with pH-triggered disintegrating polymer multilayers.
  • Experimental studies of swimmer motion in microfluidic channels under varying pH gradients.
  • Theoretical modeling to analyze propulsion dynamics and correlate with experimental observations.
  • Systematic variation of parameters including swimmer geometry, number of polymer layers, pH gradient steepness, and swimmer mass.

Main Results:

  • Homogenously coated swimmers demonstrated significantly higher velocities compared to Janus-shaped counterparts.
  • Swimmers exhibited directional motion in steep pH gradients and random motion in shallow gradients.
  • Increased number of polymer multilayers, steeper pH gradients, and lower swimmer mass led to enhanced self-propulsion velocities.
  • The mechanism proved effective for designing fast and biocompatible swimmers.

Conclusions:

  • pH-triggered disintegrating polymer multilayers provide an effective and tunable method for swimmer self-propulsion.
  • Homogeneous coating is superior to Janus coating for maximizing velocity in this system.
  • The findings open avenues for creating advanced, biocompatible micro-swimmers for various applications using polymer chemistry.