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The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the...
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Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure
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ZnO-based microrockets with light-enhanced propulsion.

Renfeng Dong1, Chun Wang, Qinglong Wang

  • 1School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China. caiyp@scnu.edu.cn.

Nanoscale
|October 3, 2017
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Summary
This summary is machine-generated.

New zinc oxide-platinum (ZnO-Pt) microrockets show enhanced propulsion using ultraviolet light. These light-activated micro-motors offer controllable speed and improved efficiency for nanotechnology applications.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Chemical Engineering

Background:

  • Artificial micro-nanomotors are crucial for cargo delivery and require efficient propulsion.
  • Zinc oxide (ZnO) exhibits excellent photocatalytic properties, while platinum (Pt) is a known chemical catalyst.
  • Atomic layer deposition (ALD) is a precise thin-film fabrication technique.

Purpose of the Study:

  • To develop ZnO-Pt microrockets with light-enhanced propulsion.
  • To investigate the impact of ultraviolet (UV) light intensity on microrocket velocity.
  • To compare the performance of ZnO-Pt microrockets with existing poly(3,4-ethylenedioxythiophene)-Pt (PEDOT-Pt) microrockets.

Main Methods:

  • Fabrication of ZnO-Pt microrockets using atomic layer deposition (ALD).
  • Testing microrocket propulsion in hydrogen peroxide (H2O2) fuel under varying UV light intensities.
  • Electrochemical measurements to confirm photocatalytic enhancement.

Main Results:

  • ZnO-Pt microrocket velocity doubled under 77 mW cm-2 UV light in 10% H2O2.
  • Propulsion speed was nearly 3 times higher than PEDOT-Pt microrockets under similar UV conditions.
  • Propulsion speed was controllable by adjusting UV light intensity, enabling "weak/strong" movement.

Conclusions:

  • ZnO-Pt microrockets demonstrate significant light-enhanced propulsion.
  • The developed microrockets offer high reversibility and controllable speed by switching UV light on/off.
  • These findings are significant for developing efficient, economically viable micro-nanomotors for practical applications.