Extreme near-field heat transfer between silica surfaces

Abstract

Despite recent experiments exhibiting an impressive enhancement in radiative heat flux between parallel planar silica surfaces with gap sizes of about 10 nm, the exploration of sub-nanometric gap distances remains unexplored. In this work, by employing non-equilibrium molecular dynamics (NEMD) simulations, we study the heat transfer between two SiO2 plates in both their amorphous and crystalline forms. When the gap size is 2 nm, we find that the heat transfer coefficient experiences a substantial ~30-fold increase compared to the experimental value at the gap size of 10 nm confirming the dependence on the distance inversely quadratic as predicted by the fluctuational electrodynamics (FE) theory. Comparative analysis between NEMD and FE reveals a generally good agreement, particularly for amorphous silica. Spectral heat transfer analysis demonstrates the profound influence of gap size on heat transfer, with peaks corresponding to the resonances of dielectric function. Deviations from fluctuational electrodynamics theory at smaller gap sizes are interpreted in the context of acoustic phonon tunneling and the effects of a gradient of permittivity close to the surfaces.

References in corpus (27)

• Surface Electromagnetic Waves Thermally Excited: Radiative Heat Transfer, Coherence Properties and Casimir Forces Revisited in the Near Field
• Near-field heat transfer in a scanning thermal microscope
• Role of anharmonic phonon scattering in the spectrally decomposed thermal conductance at planar interfaces
• Near-field Radiative Heat Transfer in Many-Body Systems
• Radiative heat transfer between nanostructures
• Frequency-dependent phonon mean free path in carbon nanotubes from non-equilibrium molecular dynamics
• Near-field radiative heat transfer between a sphere and a substrate
• Effects of spatial dispersion in near-field radiative heat transfer between two parallel metallic surfaces
• Spectral mapping of heat transfer mechanisms at liquid-solid interfaces
• Near-field spectroscopy of silicon dioxide thin films
• Radiative Thermal Rectification between SiC and SiO2
• Near-field radiative heat transfer between closely spaced graphene and amorphous SiO${}_2$
• Acoustic Phonon Tunneling and Heat Transport due to Evanescent Electric Fields
• Classical to quantum transition of near-field heat transfer between two nanoparticles
• Perspective on Near-Field Radiative Heat Transfer
• Extreme Near-Field Heat Transfer Between Gold Surfaces
• Radiative thermal rectification in many-body systems
• Smart thermal management with near-field thermal radiation
• Atomistic simulation of phonon heat transport across metallic nanogaps
• Super-Planckian Radiative Heat Transfer between Metallic Surfaces Due to Near-Field and Thin-Film Effects
• First-principles calculations of phonon transport across a vacuum gap
• Role of Nottingham effect in the heat transfer in extreme near-field regime
• Atomistic modeling of extreme near-field heat transport across nanogaps between two polar dielectric materials
• Coupling between conduction and near-field radiative heat transfer in tip-plane geometry
• Radiative heat exchange driven by acoustic vibration modes between two solids at the atomic scale
• Electronic heat tunneling between two metals beyond the WKB approximation
• Heat transfer between two metals through subnanometric vacuum gaps

Cited by in corpus (3)

• Flexible Tuning of Asymmetric Near-field Radiative Thermal Transistor by Utilizing Distinct Phase Change Materials
• Crystal Orientation Dependence of Extreme Near-Field Heat Transfer between Polar Materials Governed by Surface Phonon Modes
• Non-equilibrium Green's function formalism for radiative heat transfer