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Colloids with key-lock interactions: nonexponential relaxation, aging, and anomalous diffusion.

Nicholas A Licata1, Alexei V Tkachenko

  • 1Department of Physics and Michigan Center for Theoretical Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2007
PubMed
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This study explores particle interactions via biomolecular binding, revealing two distinct regimes: localized and diffusive. Increased binding leads to longer bound state lifetimes, similar to aging in glassy systems.

Area of Science:

  • Biophysics
  • Soft Matter Physics
  • Chemical Physics

Background:

  • Particles interacting via biomolecular binding are crucial in biological systems and nanotechnology.
  • Examples include DNA-grafted colloids and antibody-functionalized particles.
  • Understanding their collective dynamics is key for designing novel materials and understanding biological processes.

Purpose of the Study:

  • To theoretically investigate the dynamics of particles with key-lock biomolecular binding.
  • To identify and characterize different dynamic regimes based on functional group coverage.
  • To explore the relationship between binding, diffusion, and emergent phenomena like aging.

Main Methods:

  • Theoretical modeling of particle-biomolecule interactions.

Related Experiment Videos

  • Analysis of particle departure time distributions.
  • Investigation of diffusion coefficients and anomalous transport behaviors.

    • Main Results:

    • Two distinct dynamic regimes were predicted: localized and diffusive.
    • Low coverage leads to an exponential distribution of departure times.
    • Increased coverage results in a diffusive regime with significantly longer bound state lifetimes, mimicking aging in glassy systems.
    • Diffusion behavior ranges from renormalized diffusion to anomalous subdiffusion.

    Conclusions:

    • The coverage of functional groups dictates particle interaction dynamics.
    • The interplay of desorption and diffusion leads to complex behaviors, including aging-like phenomena.
    • Findings offer insights into particle self-assembly, colloidal systems, and transport in disordered media.