Spiral diffusion of self-assembled dimers of Janus spheres

John G. Gibbs, Amir Nourhani, Joel N. Johnson, Paul E. Lammert

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Janus spheres, micron-sized silica spheres half-coated with platinum, move rectilinearly away from the platinum side in aqueous hydrogen peroxide. Upon self-assembling, these colloidal particles can form dimers with different conformations that exhibit both rectilinear and rotational modes of motion depending upon the relative orientation of each Janus sphere. At the micron length-scale, stochastic rotational Brownian dynamics is of the order of deterministic dynamics, and their coupling results in effective diffusion, in addition to passive translational diffusion. For dimers with rotary motion, the dynamic coupling leads to spiral trajectories for an ensemble average of the displacement vector.

Original languageEnglish (US)
Pages (from-to)3471-3478
Number of pages8
JournalMRS Advances
Issue number57
StatePublished - 2017


  • Colloid
  • Diffusion
  • Self-assembly

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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