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Updated: May 17, 2025

Motility of Single Molecules and Clusters of Bi-Directional Kinesin-5 Cin8 Purified from S. cerevisiae Cells
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Atomically Precise Nanoclusters as Co-Catalysts for Light-Activated Microswimmer Motility.

John Castañeda1, Blake Rogers1, Ysaris Sosa1

  • 1Department of Applied Physics and Materials Science and Center for Materials Interfaces in Research and Applications (¡MIRA!), Northern Arizona University, 1900 S Knoles Dr, Flagstaff, AZ, 86011, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|May 16, 2025
PubMed
Summary
This summary is machine-generated.

Gold nanoclusters enhance microswimmer propulsion by acting as co-catalysts with TiO2/Cr2O3. This creates light-switchable microswimmers with improved performance for environmental catalysis and drug delivery applications.

Keywords:
atomically precise nanoclusterhybrid microswimmerslight‐activated microswimmersphotocatalytic active matter

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Chemical Engineering

Background:

  • Microswimmers are self-propelled particles with applications in environmental remediation, biosensing, and drug delivery.
  • Their propulsion efficiency depends on engineered catalytic surfaces.
  • Gold nanoclusters (AuNCs) offer tunable optical properties and high surface area, making them promising catalysts.

Purpose of the Study:

  • To investigate the integration of AuNCs with TiO2/Cr2O3 Janus microswimmers for enhanced photocatalytic performance.
  • To evaluate the impact of AuNCs as co-catalysts on microswimmer propulsion and motion characteristics.

Main Methods:

  • Fabrication of hybrid TiO2/Cr2O3 Janus microswimmers functionalized with AuNCs.
  • Photocatalytic activity assessment under ultraviolet (UV) excitation.
  • Quantitative motion analysis, including propulsion speed and mean squared displacement (MSD).

Main Results:

  • The hybrid AuNC-microswimmers demonstrated significantly enhanced propulsion compared to control microswimmers.
  • Increased mean squared displacement (MSD) was observed, indicating improved navigation and diffusion characteristics.
  • The AuNCs acted as effective co-catalysts, boosting the photocatalytic activity of the TiO2 component.

Conclusions:

  • The integration of AuNCs with semiconductor microswimmers enables the development of advanced, light-switchable microswimmers.
  • These hybrid systems offer precise control over catalytic and motile behaviors at the microscale.
  • AuNC-microswimmer systems present new opportunities for environmental catalysis and targeted applications.