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Does thermophoretic mobility depend on particle size?

Marco Braibanti1, Daniele Vigolo, Roberto Piazza

  • 1Dipartimento di Chimica, Materiali e Ingegneria Chimica Politecnico di Milano, 20133 Milano, Italy.

Physical Review Letters
|March 21, 2008
PubMed
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Thermophoresis, particle drift due to temperature gradients, is independent of particle size in suspensions. This finding is crucial for advancing nanometric microfluidics.

Area of Science:

  • Colloid Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • Thermophoresis describes particle movement influenced by temperature gradients.
  • Understanding thermophoretic behavior is key for manipulating particles in microfluidic devices.

Purpose of the Study:

  • To investigate the temperature dependence of thermophoretic mobility for polystyrene latex suspensions.
  • To determine the influence of particle size and interfacial properties on thermophoresis.

Main Methods:

  • Measuring the temperature dependence of thermophoretic mobility (D(T)).
  • Standardizing interfacial properties by adsorbing surfactant layers on colloidal particles.

Main Results:

  • Thermophoretic mobility (D(T)) was found to be largely independent of particle size.

Related Experiment Videos

  • Standardized interfacial properties led to D(T) values close to those of micellar solutions of the adsorbed surfactant.

    • Conclusions:

    • Particle size does not significantly affect thermophoresis in standardized colloidal suspensions.
    • These results have implications for the development of nanometric microfluidic systems.