Complex coupling between surface charge and thermo-osmotic phenomena

Ouadfel, Mehdi; De San Féliciano, Michael; Herrero, Cecilia; Merabia, Samy; Joly, Laurent

doi:10.1039/d3cp03083k

Phys. Chem. Chem. Phys.

2023

DOI: 10.1039/d3cp03083k

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Complex coupling between surface charge and thermo-osmotic phenomena

Mehdi Ouadfel,

Michael De San Féliciano,

Cecilia Herrero

et al.

Abstract: Surface charge has a large and complex impact on interfacial enthalpy excess and liquid–solid slip, with important consequences for thermo-osmotic phenomena, which can be used to harvest waste heat.

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Cited by 6 publications

References 73 publications

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Fast thermo-osmotic flow through covalent organic framework multilayers for desalination

Zhang,

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2025

Desalination

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Fast thermo-osmotic flow through covalent organic framework multilayers for desalination

Zhang,

Pan,

Wei

2025

Desalination

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Fan,

Li,

Tan

et al. 2024

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Nanofluidic Thermoelectric Transducer with Ultrahigh and Tunable Sensitivity

Li,

Peng,

et al. 2024

J. Phys. Chem. Lett.

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Thermosensitive transient receptor potential (ther-moTRP) ion channels can transduce external thermal stimuli to neural electrical signals, allowing organisms to detect and respond to changes in environmental temperature. Reproducing such ionic machinery holds promise for advancing the design of highly efficient low-grade thermal energy harvesters and ultrasensitive thermal sensors. However, there still exist challenges for artificial nanofluidic architectures to achieve comparable thermoelectric performance. Here, we report nanofluidic thermoelectric transducers with ultrahigh and tunable sensitivities controlled by electrostatic gating in graphene nanochannels. The equivalent Seebeck coefficient can be significantly boosted and reaches 1 order of magnitude higher than the current state of the art, even beyond thermoTRP ion channels. The improvement is attributed to substantial slippage on the highly charged graphene surface, leading to enhanced electrokinetic ion transport inside the graphene channel, which is confirmed by a scaling theory for thermoelectric coupling as well as molecular dynamic simulations. The dependence of the nanofluidic thermoelectric on the concentration, channel size, and cation types is also investigated to further clarify the underlying mechanism.

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Complex coupling between surface charge and thermo-osmotic phenomena

Abstract: Surface charge has a large and complex impact on interfacial enthalpy excess and liquid–solid slip, with important consequences for thermo-osmotic phenomena, which can be used to harvest waste heat.

Cited by 6 publications

References 73 publications

Fast thermo-osmotic flow through covalent organic framework multilayers for desalination

Fast thermo-osmotic flow through covalent organic framework multilayers for desalination

Refinement of the thermo-osmotic velocity calculation methodology and investigation of control strategies

Nanofluidic Thermoelectric Transducer with Ultrahigh and Tunable Sensitivity

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