What controls thermo-osmosis? Molecular simulations show the critical role of interfacial hydrodynamics
arXiv:1710.09734 · doi:10.1103/PhysRevLett.119.214501
Abstract
Thermo-osmotic and related thermo-phoretic phenomena can be found in many situations from biology to colloid science, but the underlying molecular mechanisms remain largely unexplored. Using molecular dynamics simulations, we measured the thermo-osmosis coefficient by both mechano-caloric and thermo-osmotic routes, for different solid-liquid interfacial energies. The simulations reveal in particular the crucial role of nanoscale interfacial hydrodynamics. For non-wetting surfaces , thermo-osmotic transport is largely amplified by hydrodynamic slip at the interface. For wetting surfaces, the position of the hydrodynamic shear plane plays a key role in determining the amplitude and sign of the thermo-osmosis coefficient. Finally, we measure a giant thermo-osmotic response of the water-graphene interface, which we relate to the very low interfacial friction displayed by this system. These results open new perspectives for the design of efficient functional interfaces for, e.g., waste heat harvesting.
arXiv commentPhysical Review Letters, American Physical Society, A Para{î}tre
References in corpus (20)
- Canonical sampling through velocity-rescaling
- Designing phoretic micro- and nano-swimmers
- Friction of Water on Graphene and Hexagonal Boron Nitride from ab initio Methods: Very Different Slippage Despite Very Similar Interface Structures
- Hydrodynamics within the Electric Double Layer on slipping surfaces
- Optimizing water permeability through the hourglass shape of aquaporins
- Giant amplification of interfacially driven transport by hydrodynamic slip: diffusio-osmosis and beyond
- Liquid friction on charged surfaces: from hydrodynamic slippage to electrokinetics
- Thermo-osmotic flow in thin films
- Electro-hydrodynamics near Hydrophobic Surfaces
- Capillary filling with giant liquid/solid slip: dynamics of water uptake by carbon nanotubes
- Large permeabilities of hourglass nanopores: From hydrodynamics to single file transport
- Ion specificity and anomalous electrokinetic effects in hydrophobic nanochannels
- Molecular Simulation of Thermo-osmotic slip
- Water transport inside a single-walled carbon nanotube driven by temperature gradient
- Critical Drying of Liquids
- Osmotic and diffusio-osmotic flow generation at high solute concentration. I. Mechanical approaches
- How strongly do hydrogen and water molecules stick to carbon nanomaterials?
- Osmotic and diffusio-osmotic flow generation at high solute concentration. II. Molecular dynamics simulations
- Thermocapillary Flow on Superhydrophobic Surfaces
- Electro-osmosis at surfactant-laden liquid-gas interfaces: beyond standard models
Cited by in corpus (21)
- Osmosis, from molecular insights to large-scale applications
- Liquid-solid slip on charged walls: dramatic impact of charge distribution
- Measuring surface charge: why experimental characterization and molecular modeling should be coupled
- Giant thermoelectric response of nanofluidic systems driven by water excess enthalpy
- Open-Boundary Hamiltonian adaptive resolution. From grand canonical to non-equilibrium molecular dynamics simulations
- Hamiltonian transformation to compute Thermo-osmotic Forces
- Thermal forces from a microscopic perspective
- Thermo-osmosis in charged nanochannels: effects of surface charge and ionic strength
- Fast and Versatile Thermo-osmotic Flows with a Pinch of Salt
- Microfluidic pump driven by anisotropic phoresis
- Sampling mobility profiles of confined fluids with equilibrium molecular dynamics simulations
- Thermo-osmotic slip flows around a thermophoretic microparticle characterized by optical trapping of tracers
- Complex coupling between surface charge and thermo-osmotic phenomena
- Comparing Theory and Simulation for Thermo-osmosis
- The stochastic motion of self-thermophoretic Janus particles
- Challenges in modelling diffusiophoretic transport
- A simple statistical-mechanical interpretation of Onsager reciprocal relations and Derjaguin theory of thermo-osmosis
- Slip-flow theory for thermo-osmosis based on a kinetic model with near-wall potential
- Semi-analytical model of optothermal fluidics in a confinement
- Fast Increase of Nanofluidic Slip in Supercooled Water: the Key Role of Dynamics
- Temperature-gradient-induced electrokinetic flow and thermoelectricity of electrolyte solutions in a capillaries