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Photochemically Activated Motors: From Electrokinetic to Diffusion Motion Control.

Kuan Zhang1,2, Jordi Fraxedas1, Borja Sepulveda1

  • 1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST , Campus UAB, Bellaterra, 08193 Barcelona, Spain.

ACS Applied Materials & Interfaces
|December 5, 2017
PubMed
Summary

Researchers explored two propulsion mechanisms in silicon/platinum micromotors. They found that altering metal surface roughness can switch between light-controlled and light-insensitive movement, impacting motor performance.

Keywords:
catalytic motorschemomechanical actuationelectro-hydrodynamics forceslight-driven motorsphotoactivation

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Area of Science:

  • Nanotechnology
  • Physical Chemistry
  • Materials Science

Background:

  • Self-propelled micro/nanomotors convert chemical energy to mechanical motion.
  • Understanding propulsion mechanisms is crucial for applications in biomedicine and environmental remediation.

Purpose of the Study:

  • To investigate competing chemomechanical propulsion mechanisms in semiconductor/metal (Si/Pt) micromotors.
  • To demonstrate control over these mechanisms by tuning surface roughness.

Main Methods:

  • Utilized silicon/platinum micromotors in a pump configuration under visible light.
  • Analyzed propulsion mechanisms influenced by hydrogen peroxide (H2O2) and surface roughness.
  • Investigated photoactivation reactions and redox decomposition of H2O2.

Main Results:

  • Identified two competing mechanisms: light-driven electro-osmosis and light-insensitive diffusio-osmosis.
  • Demonstrated that increasing metal surface roughness switches actuation from light-controlled to light-insensitive.
  • Observed distinct differences in fluid flow, electric fields, and light sensitivity based on the dominant mechanism.

Conclusions:

  • Surface roughness is a key factor in controlling micromotor actuation mechanisms.
  • Findings offer insights for designing and optimizing photoactivated catalytic devices and bimetallic motors.