Dynamic stabilization of Janus sphere trans-dimers.
Joel N Johnson1, Amir Nourhani1,2,3, Robert Peralta1
1Department of Physics and Astronomy, Northern Arizona University, Flagstaff, Arizona 86011, USA.
Physical Review. E
|May 17, 2017
Summary
Chemically active Janus spheres self-assemble into dimers. Higher fuel concentration favors the trans-dimer formation, driven by increased spinning and reduced movement.
Area of Science:
- Colloid science
- Chemical physics
- Self-assembly
Background:
- Colloidal particles with distinct chemical properties on their surfaces (Janus spheres) are key building blocks for advanced materials.
- Understanding self-assembly mechanisms is crucial for designing functional microstructures.
Purpose of the Study:
- To investigate the self-assembly of chemically active colloidal Janus spheres into dimers.
- To determine the influence of fuel concentration on dimer conformation.
Main Methods:
- Experimental investigation of colloidal Janus sphere self-assembly.
- Varying hydrogen peroxide fuel concentration to observe changes in dimer formation.
Main Results:
- The trans-dimer conformation becomes dominant as hydrogen peroxide concentration increases.
- This conformation features active sites oriented oppositely and particles touching at their equators.
- High spinning frequency and minimal translational motion correlate with trans-dimer stabilization.
Conclusions:
- Fuel concentration significantly impacts the self-assembly and preferred conformation of active Janus dimers.
- Particle dynamics, specifically high-frequency spinning, play a role in stabilizing specific dimer structures.
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