Download or read book Thermal Transport on the Nanometer Scale and the Effect of Microstructure and Interface Resistance written by Ruxandra M. Costescu and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nano scale Heat Transfer in Nanostructures written by Jihong Al-Ghalith and published by Springer. This book was released on 2018-03-06 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book introduces modern atomistic techniques for predicting heat transfer in nanostructures, and discusses the applications of these techniques on three modern topics. The study of heat transport in screw-dislocated nanowires with low thermal conductivity in their bulk form represents the knowledge base needed for engineering thermal transport in advanced thermoelectric and electronic materials, and suggests a new route to lower thermal conductivity that could promote thermoelectricity. The study of high-temperature coating composite materials facilitates the understanding of the role played by composition and structural characterization, which is difficult to approach via experiments. And the understanding of the impact of deformations, such as bending and collapsing on thermal transport along carbon nanotubes, is important as carbon nanotubes, due to their exceptional thermal and mechanical properties, are excellent material candidates in a variety of applications, including thermal interface materials, thermal switches and composite materials.
Download or read book Micro and Nano Thermal Transport written by Lin Qiu and published by Academic Press. This book was released on 2022-02-09 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro and Nano Thermal Transport Research: Characterization, Measurement and Mechanism is a complete and reliable reference on thermal measurement methods and mechanisms of micro and nanoscale materials. The book has a strong focus on applications and simulation, providing clear guidance on how to measure thermal properties in a systematic way. Sections cover the fundamentals of thermal properties before introducing tools to help readers identify and analyze thermal characteristics of these materials. The thermal transport properties are then further explored by means of simulation which reflect the internal mechanisms used to generate such thermal properties. Readers will gain a clear understanding of thermophysical measurement methods and the representative thermal transport characteristics of micro/nanoscale materials with different structures and are guided through a decision-making process to choose the most effective method to master thermal analysis. The book is particularly suitable for those engaged in the design and development of thermal property measurement instruments, as well as researchers of thermal transport at the micro and nanoscale. - Includes a variety of measurement methods and thermal transport characteristics of micro and nanoscale materials under different structures - Guides the reader through the decision-making process to ensure the best thermal analysis method is selected for their setting - Contains experiments and simulations throughout that help apply understanding to practice
Download or read book Thermal Transport for Applications in Micro Nanomachining written by Basil T. Wong and published by Springer Science & Business Media. This book was released on 2008-07-19 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning with an overview of nanomachining, this monograph introduces the relevant concepts from solid-state physics, thermodynamics, and lattice structures. It then covers modeling of thermal transport at the nanoscale and details simulations of different processes relevant to nanomachining. The final chapter summarizes the important points and discusses directions for future work to improve the modeling of nanomachining.
Download or read book Phonon Thermal Transport in Silicon Based Nanomaterials written by Hai-Peng Li and published by Springer. This book was released on 2018-09-08 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Brief, authors introduce the advance in theoretical and experimental techniques for determining the thermal conductivity in nanomaterials, and focus on review of their recent theoretical studies on the thermal properties of silicon–based nanomaterials, such as zero–dimensional silicon nanoclusters, one–dimensional silicon nanowires, and graphenelike two–dimensional silicene. The specific subject matters covered include: size effect of thermal stability and phonon thermal transport in spherical silicon nanoclusters, surface effects of phonon thermal transport in silicon nanowires, and defects effects of phonon thermal transport in silicene. The results obtained are supplemented by numerical calculations, presented as tables and figures. The potential applications of these findings in nanoelectrics and thermoelectric energy conversion are also discussed. In this regard, this Brief represents an authoritative, systematic, and detailed description of the current status of phonon thermal transport in silicon–based nanomaterials. This Brief should be a highly valuable reference for young scientists and postgraduate students active in the fields of nanoscale thermal transport and silicon-based nanomaterials.
Download or read book Experimental Micro Nanoscale Thermal Transport written by Xinwei Wang and published by John Wiley & Sons. This book was released on 2012-05-09 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the new technologies on micro/nanoscale thermal characterization developed in the Micro/Nanoscale Thermal Science Laboratory led by Dr. Xinwei Wang. Five new non-contact and non-destructive technologies are introduced: optical heating and electrical sensing technique, transient electro-thermal technique, transient photo-electro-thermal technique, pulsed laser-assisted thermal relaxation technique, and steady-state electro-Raman-thermal technique. These techniques feature significantly improved ease of implementation, super signal-to-noise ratio, and have the capacity of measuring the thermal conductivity/diffusivity of various one-dimensional structures from dielectric, semiconductive, to metallic materials.
Download or read book Quantitative Mapping of Nanothermal Transport via Scanning Thermal Microscopy written by Jean Spièce and published by Springer Nature. This book was released on 2019-10-18 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis tackles one of the most difficult problems of modern nanoscale science and technology - exploring what governs thermal phenomena at the nanoscale, how to measure the temperatures in devices just a few atoms across, and how to manage heat transport on these length scales. Nanoscale heat generated in microprocessor components of only a few tens of nanometres across cannot be effectively fed away, thus stalling the famous Moore's law of increasing computer speed, valid now for more than a decade. In this thesis, Jean Spièce develops a novel comprehensive experimental and analytical framework for high precision measurement of heat flows at the nanoscale using advanced scanning thermal microscopy (SThM) operating in ambient and vacuum environment, and reports the world’s first operation of cryogenic SThM. He applies the methodology described in the thesis to novel carbon-nanotube-based effective heat conductors, uncovers new phenomena of thermal transport in two- dimensional (2D) materials such as graphene and boron nitride, thereby discovering an entirely new paradigm of thermoelectric cooling and energy production using geometrical modification of 2D materials.
Download or read book Nanoscale Energy Transport and Harvesting written by Zhang Gang and published by CRC Press. This book was released on 2015-02-04 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy transport and conversion in nanoscale structures is a rapidly expanding area of science. It looks set to make a significant impact on human life and, with numerous commercial developments emerging, will become a major academic topic over the coming years. Owing to the difficulty in experimental measurement, computational simulation has becom
Download or read book Advanced Computational Nanomechanics written by Nuno Silvestre and published by John Wiley & Sons. This book was released on 2016-02-08 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains the latest research advances in computational nanomechanics in one comprehensive volume Covers computational tools used to simulate and analyse nanostructures Includes contributions from leading researchers Covers of new methodologies/tools applied to computational nanomechanics whilst also giving readers the new findings on carbon-based aggregates (graphene, carbon-nanotubes, nanocomposites) Evaluates the impact of nanoscale phenomena in materials
Download or read book Molecular Dynamics Simulation of Thermal Energy Transport Across Material Interfaces written by Tengfei Luo and published by . This book was released on 2009 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both ab-initio and classical molecular dynamics (MD) were used to study the thermal energy transport phenomena across nano-scale material interfaces. Thermal equilibration in semiconductor ultra-thin layered superlattices was simulated by ab-initio MD with density functional theory (OFT). Equilibrium MD (EMD) and Non-equilibrium MD (NEMD) simulations were performed on Au-SAM (self-assembly monolayer)-Au junctions with alkanedithiols being the SAM molecules. The in-plane thermal conductivities were calculated using EMD with Green-Kubo method. The out-of-plane thermal conductances were calculated in both EMD and NEMD simulations. Au substrate thickness effect, temperature effect, simulated normal pressure effect, molecular chain length effect, molecule coverage effect and molecule-substrate bonding strength effect on thermal conductivity/conductance were studied. Vibration density of states (VDOS) was calculated, and the mechanism of thermal energy transport across the material junctions was analyzed. The calculated thermal conductance at high temperatures agrees well with available experimental data. The temperature dependence of thermal conductance has a similar trend to experimental observations. SAM molecular coverage was found to be important on the interfacial thermal conductance. Analysis of the junction response to a heat pulse showed that the Au-SAM interface resistance was much larger than the substrate and SAM resistances. The results showed that the Au-SAM interface resistance dominated thermal energy transport across the junction The DFT ab-initio method was used to study the bondings of thiols on As-terminated GaAs (001) surfaces. As-S interactions were simulated by the Morse potential, and the parameters were fitted to an energy hypersurface obtained from DFT calculations. NEMD simulations were then performed on GaAs-SAM-GaAs junctions to study thermal energy transport across thiol-GaAs interfaces. NEMD simulations were also carried out to study thermal energy transport across different graphene-polymer interfaces. The results of this study will be useful for the current molecular electronics industry in which thermal dissipation is a critical problem to be resolved. It is concluded that the interfacial resistance is the barrier for thermal transport across molecule-solid junctions. As a result, methods to facilitate thermal transport across the interfaces, such as depositing denser SAM, forming stronger molecule-solid bonds, choosing materials with better vibration coupling, are to be considered in the emerging technology of the manufacturing of molecular electronics.
Download or read book Thermal Contact Conductance written by Chakravarti V. Madhusudana and published by Springer Science & Business Media. This book was released on 2013-09-24 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work covers both theoretical and practical aspects of thermal contact conductance. The theoretical discussion focuses on heat transfer through spots, joints, and surfaces, as well as the role of interstitial materials (both planned and inadvertent). The practical discussion includes formulae and data that can be used in designing heat-transfer equipment for a variety of joints, including special geometries and configurations. All of the material has been updated to reflect the latest advances in the field.
Download or read book Microscale and Nanoscale Heat Transfer written by C.B. Sobhan and published by CRC Press. This book was released on 2008-06-12 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through analyses, experimental results, and worked-out numerical examples, Microscale and Nanoscale Heat Transfer: Fundamentals and Engineering Applications explores the methods and observations of thermophysical phenomena in size-affected domains. Compiling the most relevant findings from the literature, along with results from their own re
Download or read book Thermal Conduction Phenomena in Nanostructured Semiconductor Devices and Materials written by Mr. Zijian Li and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal phenomena have become very important in a variety of nanostructured semiconductor devices and materials. The reduced dimensions and large interface densities lead to complex thermal phenomena which do not occur in bulk materials and larger devices. Successful designs of high-performance semiconductor devices, including phase change memory (PCM) and high electron mobility transistors (HEMT), rely on the accurate thermal characterization of thin film materials and improved understanding of nanoscale energy transport physics. This thesis addresses nanoscale thermal transport problems relevant for three promising electronics technologies. The first part of this work investigates thermal conduction phenomena in phase change memory. A combination of frequency-domain electrical thermometry and suspended microstructure design are used to measure the in- and out-of-plane thermal conductivities of thin-film Ge2Sb2Te5 in the amorphous and crystalline phases. The preferential grain orientation and mixed phase distribution lead to a reduced in-plane thermal conductivity that is 60% -- 80% of the out-of-plane value. Anisotropic heat conduction benefits PCM devices by reducing the programming current and mitigating the thermal disturbance to adjacent cells. A fully coupled electrothermal simulation unveils the detailed transient phase distribution during a programming operation, enabling more efficient structural designs for multilevel memory operation. This research extends the thermal characterization and modeling techniques to diamond-based high electron mobility transistors. The high thermal conductivity of the diamond provides superior thermal performance and allows for up to 10x higher power density. Nanoheaters down to 50 nm wide are patterned by electron-beam lithography in order to measure the thermal resistance experienced by the single transistor channel, the multi-gate configuration, and the device package. The thermal resistance data reveals the critical role of thermal interface between the GaN device layer and the diamond substrate. This work established a criterion for the diamond technology to be viable in HEMT applications. Specifically, the thermal interface resistance needs to be less than 30 m2K/GW. The lengthscales of thermal conduction studied in this research are further scaled down to a few nanometers in the final portion of this work. This work measures the thermal properties of the mirror material for extreme ultra-violet (EUV) lithography as the next-generation semiconductor manufacturing technology. The thermal transport across the interfaces of drastically different materials, such as the Mo/Si multilayers (2.8 nm / 4.1 nm), is important in the performance and reliability of the EUV mirrors. This work demonstrates strong anisotropy in the thermal conductivities of the multilayers, where the in-plane conductivity is 13 times higher than the out-of-plane value, owing to the high density of metal-semiconductor interfaces. This research reveals that thermal conduction in such periodic multilayer composites is largely determined by the nonequilibrium electron-phonon physics. A new model indicates that two additional mechanisms -- quasi-ballistic phonon transport normal to the metal film and inelastic electron-interface scattering -- can also impact conduction in metal-dielectric multilayers with period below 10 nm, the critical length scale for the EUV mirrors.
Download or read book Journal of Heat Transfer written by and published by . This book was released on 2007 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanoscale Energy Transport and Conversion written by Gang Chen and published by Oxford University Press. This book was released on 2005-03-03 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a graduate level textbook in nanoscale heat transfer and energy conversion that can also be used as a reference for researchers in the developing field of nanoengineering. It provides a comprehensive overview of microscale heat transfer, focusing on thermal energy storage and transport. Chen broadens the readership by incorporating results from related disciplines, from the point of view of thermal energy storage and transport, and presents related topics on the transport of electrons, phonons, photons, and molecules. This book is part of the MIT-Pappalardo Series in Mechanical Engineering.
Download or read book Grain size Effects in Nanoscaled Electrolyte and Cathode Thin Films for Solid Oxide Fuel Cells SOFC written by Christoph Peters and published by KIT Scientific Publishing. This book was released on 2009 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to their high energy conversion efficiencies and low emissions, Solid Oxide Fuel Cells (SOFCs) show promise as a replacement for combustion-based electrical generators at all sizes. Further increase of SOFC efficiency can be achieved by microstructural optimization of the oxygen-ion conducting electrolyte and the mixed ionic-electronic conducting cathode. By application of nanoscaled thin films, the exceptionally high efficiency allows the realization of mobile SOFCs.
Download or read book Tilgift og konkurrencer written by and published by . This book was released on 1992 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
