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Sustained rolling of microparticles in shear flow over an electrostatically patchy surface.

Surachate Kalasin1, Maria M Santore

  • 1Department of Physics, University of Massachusetts at Amherst, Amherst, Massachusetts 01003, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 10, 2010
PubMed
Summary

Patchy surfaces promote microparticle rolling on adhesive substrates, crucial for microfluidic device development. This localized adhesion facilitates particle manipulation and separation in microfluidic systems.

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Area of Science:

  • Surface science
  • Microfluidics
  • Electrostatics

Background:

  • Understanding microparticle capture on surfaces is vital for microfluidic applications.
  • Electrostatic interactions govern particle-surface dynamics, influencing capture and manipulation.
  • Developing surfaces that control particle motion is key for advanced microfluidic devices.

Purpose of the Study:

  • To investigate particle-level dynamics of microparticle capture on adhesive surfaces.
  • To explore conditions promoting sustained microparticle rolling for microfluidic applications.
  • To analyze the effect of surface charge heterogeneity on microparticle capture and rolling.

Main Methods:

  • Studied capture of negative silica microspheres on three model surfaces: bare silica, fully cationic, and electrostatically patchy surfaces.

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  • Investigated particle-surface interactions dominating over particle-particle interactions.
  • Measured particle velocity and run lengths under shear flow.

    • Main Results:

    • Sustained rolling of 1 micrometer silica particles was observed on the patchy surface at velocities near 2 micrometers/second.
    • Rolling run lengths exceeded several hundred micrometers on the patchy surface, with more particles escaping than arresting.
    • Firm particle arrest and short rolling run lengths were observed on the fully cationic surface, while bare silica showed limited rolling.

    Conclusions:

    • Patchy surfaces facilitate sustained microparticle rolling by creating localized attractions, mimicking surface roughness or ligand-receptor interactions.
    • Physicochemical heterogeneity on surfaces can be engineered to control microparticle dynamics.
    • This controlled rolling is beneficial for developing microfluidic devices for particle manipulation and separation.