Article
Nanoscience & Nanotechnology
Ashutosh Giri, Ramez Cheaito, John T. Gaskins, Takanori Mimura, Harlan J. Brown-Shaklee, Douglas L. Medlin, Jon F. Ihlefeld, Patrick E. Hopkins
Summary: Experimental results show that thermal resistance may not increase with the addition of confined solid-solution films of varying thicknesses between parent materials. This contradicts the conventional understanding that adding more material leads to larger thermal resistances. The results potentially support the concept of vibrational matching across interfaces, suggesting that adding a thin vibrational bridge layer between two solids could enhance thermal boundary conductance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
C. Ulises Gonzalez-Valle, Bladimir Ramos-Alvarado
Summary: Engineering nano- and microscale systems for water filtration, drug delivery, and biosensing is enabled by the intrinsic interactions of ionic compounds in aqueous environments and limited by our understanding of these polar solid-liquid interfaces. Particularly, the fundamental understanding of the electrostatic properties of the inner pore surface of alumina nanoporous membranes could lead to performance enhancement for evaporation and filtration applications. This investigation reports on the modeling and characterization of the wettability and thermal transport properties of water-alumina interfaces. Abnormal droplet spreading was observed while using documented modeling parameters for water-alumina interfaces. This issue was attributed to the overestimation of Coulombic interactions and was corrected using reactive molecular dynamics simulations. The interfacial entropy change (from bulk to interface) of liquid molecules was calculated for different alumina surfaces. It was found that surfaces with high interfacial entropy change correlate with a high interfacial concentration of water molecules and a dominant contribution from in-plane modes to thermal transport. Conversely, highly mobile water molecules in low entropy interfaces concurred with the out-of-plane modes contributing the most to the energy transport. The hydroxyls on the passivated solid interface led to the formation of hydrogen bonds, and the density number of hydrogen bonds pe...
ACS APPLIED NANO MATERIALS
(2021)
Article
Physics, Applied
Yijun Ge, Yanguang Zhou, Timothy S. Fisher
Summary: This study combines first-principles calculations, spin-lattice dynamics, and NEGF method to compute thermal boundary conductance at a three-dimensional Co-Cu interface, considering spin-lattice interactions. It is found that spin-wave transmission is low and interfacial thermal conductance is reduced. The results are compared to the NEGF method, showing a similar trend with spins included.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Haiyang Li, Jun Wang, Guodong Xia
Summary: Thermal rectification, the phenomenon where the heat flux is much larger in one direction than in the opposite direction, is implemented in an asymmetric solid-liquid-solid sandwiched system with a nano-structured interface. Non-equilibrium molecular dynamics simulations reveal that the thermal rectification effect is due to the difference in interfacial thermal resistance between Cassie and Wenzel states when reversing the temperature bias. The effects of liquid density, solid-liquid bonding strength, and nanostructure size on thermal rectification are also examined, providing new insights for the design of thermal devices.
Article
Nanoscience & Nanotechnology
Jingjing Shi, Chao Yuan, Hsien-Lien Huang, Jared Johnson, Chris Chae, Shangkun Wang, Riley Hanus, Samuel Kim, Zhe Cheng, Jinwoo Hwang, Samuel Graham
Summary: This study investigates thermal transport at beta-Ga2O3/metal interfaces using theoretical modeling and experimental measurements. It highlights the significant impact of metal cutoff frequency on thermal boundary conductance, followed by chemical reactions and defects. Different metals show varying effects on the thermal boundary conductance in these interfaces.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Nanoscience & Nanotechnology
Tianli Feng, Hao Zhou, Zhe Cheng, Leighann Sarah Larkin, Mahesh R. R. Neupane
Summary: The emergence of wide and ultrawide bandgap semiconductors has revolutionized the advancement of next-generation power, RF, and optoelectronics, but the thermal boundary resistance at semiconductor interfaces hinders heat dissipation. Many new high thermal conductivity materials and techniques have been developed to improve thermal boundary resistance, and simulation methods have been developed to advance understanding. However, there is a large gap between experiments and simulations. This review comprehensively summarizes the experimental and simulation works, aiming to build a structure-property relationship between thermal boundary resistance and interfacial nanostructures and to improve thermal boundary resistance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Condensed Matter
Shany Mary Oommen, Lorenzo Fallarino, J. Heinze, Olav Hellwig, Simone Pisana
Summary: We systematically analyzed the influence of 5 nm thick metal interlayers inserted at the interface of different metal-dielectric systems. Our results show that the parameters that most influence interface transport are the electron-phonon coupling strength and the maximum phonon frequency. This study provides guidance for selecting materials for thermal interface engineering.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Applied
Cecilia Herrero, Laurent Joly, Samy Merabia
Summary: This paper investigates the interfacial heat transfer between water and gold and proposes a method to increase the interfacial resistance by nanostructuring the gold surface and coating it with graphene. The results show a significant increase in the resistance compared to the planar gold situation. The predicted high thermal resistance makes this system a robust alternative to superhydrophobic materials.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Anna T. Bui, Fabian L. Thiemann, Angelos Michaelides, Stephen J. Cox
Summary: This article introduces a theoretical framework called "quantum friction" which explains the friction behavior at water-carbon interfaces. Through simulations using a classical model, it is found that the overlap between the solid's dielectric spectrum and water's vibration modes increases friction, supporting the quantum friction theory.
Article
Thermodynamics
Yixin Xu, Guang Wang, Yanguang Zhou
Summary: Manipulating thermal transport across interfaces using nanostructures is crucial for thermal management in electronics and energy conversion. Recent experiments have shown that controllable nanopatterns can modulate the interfacial thermal conductance. Non-equilibrium molecular dynamics simulations revealed that the thermal conductance of Si/4H-SiC interfaces can be manipulated by confining nanopatterns with a thickness smaller than 30 nm. This modulation arises from competing mechanisms of phonon-boundary scattering and interfacial phonon transport channels. The study provides insights into the design and optimization of advanced thermal interface materials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Tomasz Gancarz, Piotr Ozga, Janusz Pstrus, Zbigniew Swiatek, Pawel Czaja, Aleksandra Dybel, Katarzyna Berent
Summary: In order to improve the wetting and interfacial properties, graphene was used to cover the Cu substrate. The experiment showed that the liquid metal can mechanically damage the graphene layer, so a Ni, Cu, or W layer was sputtered to protect the graphene. Micro-Raman spectrometry was used to examine the obtained graphene. The thickness of the Ni, Cu, or W layer was around 25 nm, compared to a previous study where the Ni-W electrochemically deposited layer had a thickness ranging from 8-10 μm. The experiments with Ga-Sn-Zn eutectic alloy and the sessile drop method were performed to observe changes at the interface at different temperatures and contact times. Atomic force microscopy and scanning electron microscopy combined with energy dispersive X-ray spectroscopy were used to show the topology and microstructure of the samples. X-ray diffraction was conducted to identify the phases occurring at the Cu-Ga interface. The investigation revealed that a very thin Ni, Cu, or W layer is not sufficient to protect the Cu substrate from reacting with liquid metals like Ga-Sn-Zn. The XRD analysis and microstructure observations showed the formation of the CuGa2 phase at the interface and the dissolution of the Cu substrate in the molten alloy with increasing temperature and time. The interfacial CuGa2 phase grows very slowly at annealing temperatures below 150 °C for the graphene/Ni and graphene/W coatings, making them suitable for protecting copper substrates in cooling electronic devices.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Physical
F. Valenza, S. Gambaro, A. Bigos, P. Czaja, M. Janusz-Skuza, J. Wojewoda-Budka
Summary: In this study, the isothermal wetting of graphite by a molten Ti-based alloy was investigated to understand the interfacial reactivity. A contact angle of 15 degrees was achieved after 60 minutes of liquid-solid contact, indicating limited interfacial reactivity at the metal/graphite interface. The interfacial compounds grew with time and determined the wetting behavior of the liquid on the graphite substrate.
SURFACES AND INTERFACES
(2023)
Article
Mechanics
Kevin R. Murphy, Jonathan B. Boreyko
Summary: When a sessile droplet contacts an opposing solid surface, the droplet can transfer based on wettabilities and surface velocity. This study used high-speed imaging to capture the transfer process from a solid substrate to a porous surface, varying parameters such as wettability, pore size, droplet volume, and working fluid. The transfer process is divided into wetting and wicking regimes, with wicking being significantly longer than wetting. The wetting regime has two sub-regimes, donor-independent and donor-dependent, while the wicking regime follows Darcy's law to complete the transfer.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Multidisciplinary Sciences
Qinshu Li, Fang Liu, Song Hu, Houfu Song, Susu Yang, Hailing Jiang, Tao Wang, Yee Kan Koh, Changying Zhao, Feiyu Kang, Junqiao Wu, Xiaokun Gu, Bo Sun, Xinqiang Wang
Summary: This study reveals that even for materials with similar Debye temperatures, a significant portion of phonons can transport inelastically across interfaces at high temperatures, greatly enhancing the interface thermal conductance. The sharpness of the interface strongly affects the phonon transport process. These findings provide new insights and opportunities for engineering interface thermal conductance in microelectronics materials.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
P. G. Siddappa, Andallib Tariq
Summary: Accurately estimating thermal contact conductance (TCC) is crucial for the optimal design of cryogen-free conduction-based cooling systems. This study addresses the lack of databases and reliable correlation for TCC between bare copper contacts by performing experimental studies. The results show a non-linear variation of TCC with temperature and propose an empirical correlation for TCC estimation at cryogenic temperatures.
APPLIED THERMAL ENGINEERING
(2023)
