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Molecular Shapes01:18

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Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
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Shape-Dependent Motion of Structured Photoactive Microswimmers.

Dylan Nicholls1, Andrew DeVerse1, Ra'Shae Esplin1

  • 1Department of Physics and Astronomy , Northern Arizona University , S San Francisco Street , Flagstaff , Arizona 86011 , United States.

ACS Applied Materials & Interfaces
|May 4, 2018
PubMed
Summary
This summary is machine-generated.

The shape and material of light-activated microswimmers dictate their movement. Dynamic physical vapor deposition (DPVD) enables precise control over microswimmer propulsion by tailoring these properties.

Keywords:
active colloidsactive matterlight-activated particlesself-propulsionshape-dependent motiontitanium dioxide

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Area of Science:

  • Microfluidics
  • Materials Science
  • Chemical Engineering

Background:

  • Photoactive microswimmers offer potential for targeted drug delivery and environmental remediation.
  • Controlling microswimmer behavior is crucial for practical applications.
  • Existing fabrication methods have limitations in tailoring microswimmer properties.

Purpose of the Study:

  • To investigate the relationship between microswimmer morphology, material composition, and autonomous swimming behavior.
  • To demonstrate the capability of dynamic physical vapor deposition (DPVD) in fabricating structured photoactive microswimmers.
  • To establish shape and material as key parameters for engineering microswimmer propulsion.

Main Methods:

  • Fabrication of structured photoactive microswimmers using dynamic physical vapor deposition (DPVD).
  • Characterization of microswimmer morphology and material composition.
  • Analysis of microswimmer dynamics and swimming behavior under light activation.

Main Results:

  • Microswimmer morphology significantly influences swimming dynamics and direction.
  • Photocatalytic material integration via DPVD leads to unique shape-dependent propulsion.
  • Swimming behavior is distinct from non-catalyst-based structures with similar morphology.

Conclusions:

  • Microswimmer shape and material composition are critical determinants of propulsion.
  • DPVD is a versatile technique for engineering microscale propulsion systems.
  • Tailoring fabrication parameters allows for customized microswimmer performance.