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Complex coupling between surface charge and thermo-osmotic phenomena.

Mehdi Ouadfel1, Michael De San Féliciano1, Cecilia Herrero1

  • 1Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, Villeurbanne, France. laurent.joly@univ-lyon1.fr.

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Waste heat can be converted to electricity using thermo-osmotic flows on charged surfaces. Surface charge significantly impacts interfacial enthalpy excess, crucial for optimizing this energy conversion process.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Energy Conversion

Background:

  • Thermo-osmotic flows at liquid-solid interfaces generate electric currents from thermal gradients.
  • Surface charge and interfacial enthalpy excess are key parameters for thermo-osmotic current generation.
  • The influence of surface charge on water's contribution to enthalpy excess was previously unclear.

Purpose of the Study:

  • To investigate the relationship between surface charge and interfacial enthalpy excess.
  • To understand how charge distribution and wetting affect this relationship.
  • To provide insights for optimizing waste heat recovery systems.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Analysis of interfacial enthalpy excess under varying surface charge conditions.
  • Exploration of different charge distributions and wetting scenarios.

Main Results:

  • Surface charge strongly influences interfacial enthalpy excess.
  • The impact of surface charge on enthalpy excess is highly dependent on its spatial distribution.
  • Wetting conditions showed minimal effect on the charge-enthalpy coupling.

Conclusions:

  • Surface charge is a critical factor in tuning thermo-osmotic energy conversion.
  • Spatial distribution of surface charge is more influential than wetting.
  • Findings offer guidelines for designing efficient waste heat recovery systems.