Improvement of heat transfer efficiency at solid-gas interfaces by self-assembled monolayers

Liang, Zhi; Evans, William J.; Desai, Tapan; Keblinski, Pawel

doi:10.1063/1.4792530

Cited by 34 publications

(22 citation statements)

References 22 publications

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“…For temperatures beyond 1000 K, the direct resistance increases with increasing particle temperature. This increase is characteristic of gases in contact with hot solid surfaces 27,28 and is associated with decreasing gas density. In Fig.…”

Section: A MD Simulationmentioning

confidence: 96%

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Curvature induced phase stability of an intensely heated liquid

Sasikumar

Liang

Cahill

et al. 2014

The Journal of Chemical Physics

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We use non-equilibrium molecular dynamics simulations to study the heat transfer around intensely heated solid nanoparticles immersed in a model Lennard-Jones fluid. We focus our studies on the role of the nanoparticle curvature on the liquid phase stability under steady-state heating. For small nanoparticles we observe a stable liquid phase near the nanoparticle surface, which can be at a temperature well above the boiling point. Furthermore, for particles with radius smaller than a critical radius of 2 nm we do not observe formation of vapor even above the critical temperature. Instead, we report the existence of a stable fluid region with a density much larger than that of the vapor phase. We explain the stability in terms of the Laplace pressure associated with the formation of a vapor nanocavity and the associated effect on the Gibbs free energy.

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Section: A MD Simulationmentioning

confidence: 96%

“…Such a linear variation is characteristic of gases in contact with a solid. [27][28][29] fluid layer for nanoparticles smaller than 20 Å in radius or due to explicit phase change de-wetting for larger nanoparticles. We call this temperature the de-wetting temperature and according to Fig.…”

Section: A MD Simulationmentioning

confidence: 99%

Curvature induced phase stability of an intensely heated liquid

Sasikumar

Liang

Cahill

et al. 2014

The Journal of Chemical Physics

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“…The phonon spectra of hard and soft materials usually have large mismatch due to distinct compositions and bond natures. Binding strength at the interface is another critical factor that influences thermal transport . The interfaces between hard and soft materials are usually dominated by weak van der Waals (vdW) interactions and thus present large interfacial thermal resistance .…”

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confidence: 99%

Molecular Bridge Enables Anomalous Enhancement in Thermal Transport across Hard‐Soft Material Interfaces

et al. 2014

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Conventional wisdom tells us that interfacial thermal transport is more efficient when the interface adhesion energy is enhanced. In this study, it is demonstrated that molecular bridges consisting of small molecules chemically absorbed on solid surfaces can enhance the thermal transport across hard-soft material interfaces by as much as 7-fold despite a significant decrease in the interface adhesion energy. This work provides an unconventional strategy to improve thermal transport across material interfaces.

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“…[17][18][19][20][21][22][23][24][25][26][27][28] Molecular beam scattering experiments and molecular dynamics (MD) simulations revealed the dominant factors determining the energy exchange efficiency for a variety of gas/SAM surface systems such as the mass of a gas molecule and the terminal group of SAM molecules, [19][20][21][22] attractive forces between gas molecules and the SAM terminal groups, 21,[23][24][25] surface stiffness due to intramonolayer hydrogen bonding, 21,23,26 the chain length of SAM molecules, 26 the deformation of SAM chains, 19,20,27,28 and the penetration of gas molecules into SAM layer. 28 The versatility of functional groups and tail length makes SAMs attractive for surface coatings to control gassurface interactions.…”

Section: Introductionmentioning

confidence: 99%

Gas–Surface Energy Exchange in Collisions of Helium Atoms with Aligned Single-Walled Carbon Nanotube Arrays

et al. 2013

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Since gas flows in micro/nano devices are dominated by the interaction of gas molecules and solid surfaces, surface modification technique is one of the critical issues for optimizing the thermal performance of these devices. In this paper, we demonstrate the successful application of vertically aligned single-walled carbon nanotubes (VA-SWNTs) as surface modification material to enhance the energy accommodation of gas molecules on surfaces. The scattering of gas molecules on quartz surfaces covered with VA-SWNTs is investigated by the molecular beam technique. The energy accommodation coefficients of helium, which tend to be small even for rough surfaces because of the large mass mismatch between helium and surface atoms, are close to unity on the modified surfaces. The measurement with the free-standing films further reveals that the high accommodation is attributed to the unique morphology of the films with high porosity, which allows gas molecules to penetrate into the films and realizes a large number of collisions with SWNTs. The result suggests that the surface modification with VA-SWNTs can be utilized for the thermal management in electric devices and micro/nano-electro-mechanical systems.

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Improvement of heat transfer efficiency at solid-gas interfaces by self-assembled monolayers

Cited by 34 publications

References 22 publications

Curvature induced phase stability of an intensely heated liquid

Curvature induced phase stability of an intensely heated liquid

Molecular Bridge Enables Anomalous Enhancement in Thermal Transport across Hard‐Soft Material Interfaces

Gas–Surface Energy Exchange in Collisions of Helium Atoms with Aligned Single-Walled Carbon Nanotube Arrays

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