Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Thermal Transport In Novel Three Dimensional Carbon Nanostructures
Download Thermal Transport In Novel Three Dimensional Carbon Nanostructures full books in PDF, epub, and Kindle. Read online Thermal Transport In Novel Three Dimensional Carbon Nanostructures ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Thermal Transport in Novel Three Dimensional Carbon Nanostructures by : Jungkyu Park
Download or read book Thermal Transport in Novel Three Dimensional Carbon Nanostructures written by Jungkyu Park and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional (3D) nanostructures comprised of one-dimensional (1D) and/or two-dimensional (2D) nanomaterials have several advantages over their base nanomaterials. Due to their dimensionally confined structures, for example, 1D carbon nanotubes (CNTs) and 2D graphene exhibit strong direction-dependent thermal transport properties with extremely inefficient cross-plane properties. However, 3D carbon nanostructures such as pillared graphene structures (PGS) are expected to be efficient in both in-plane and cross-plane thermal transport. The aim of this thesis is providing the detailed understanding of thermal transport in 3D carbon nanostructures comprised of CNTs and graphene. Reverse non-equilibrium molecular dynamics simulations were used to show that PGS and CNT networks can have both high in-plane and high cross-plane thermal conductivities comparable to their base nanomaterials, i.e. CNTs and graphene, and also to show that their thermal properties are tunable through altering their architectures. The results indicate that thermal resistances at CNT-graphene junctions result from the combined effect of phonon scattering at the junctions with distorted carbon-carbon bonds and the change in dimensionality of the phonon transport medium as phonons propagate from CNTs (1D) to graphene (2D) and then again to CNT. Moreover, wave packet analysis on SWCNT networks revealed that SWCNT-SWCNT junctions with lager diameter transmit thermal energy more efficiently than the junctions with smaller diameter, and also revealed that SWCNT-SWCNT T-junctions are more efficient in thermal energy transmission than X-junctions. A new experimental method for thermal conductivity measurements in 2D nanosheets was developed. The new method ensures a 1D heat conduction in a 2D sample by creating a spatially uniform temperature profile on the heated side of the sample, and thus improves the accuracy of the measurement in a 2D structure. A MEMS device that can measure the thermal conductivity of a graphene layer using this method is currently being fabricated for the validation of the method.
Book Synopsis Thermal Transport in Carbon-Based Nanomaterials by : Gang Zhang
Download or read book Thermal Transport in Carbon-Based Nanomaterials written by Gang Zhang and published by Elsevier. This book was released on 2017-06-13 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal Transport in Carbon-Based Nanomaterials describes the thermal properties of various carbon nanomaterials and then examines their applications in thermal management and renewable energy. Carbon nanomaterials include: one-dimensional (1D) structures, like nanotubes; two-dimensional (2D) crystal lattice with only one-atom-thick planar sheets, like graphenes; composites based on carbon nanotube or graphene, and diamond nanowires and thin films. In the past two decades, rapid developments in the synthesis and processing of carbon-based nanomaterials have created a great desire among scientists to gain a greater understanding of thermal transport in these materials. Thermal properties in nanomaterials differ significantly from those in bulk materials because the characteristic length scales associated with the heat carriers, phonons, are comparable to the characteristic length. Carbon nanomaterials with high thermal conductivity can be applied in heat dissipation. This 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. This authoritative and comprehensive book will be of great use to both the existing scientific community in this field, as well as for those who wish to enter it. Includes coverage of the most important and commonly adopted computational and experimental methods to analyze thermal properties in carbon nanomaterials Contains information about the growth of carbon nanomaterials, their thermal properties, and strategies to control thermal properties and applications, allowing readers to assess how to use each material most efficiently Offers a comprehensive overview of the theoretical background behind thermal transport in carbon nanomaterials
Book Synopsis Novel Three-dimensional Carbon Nanotube Networks as High Performance Thermal Interface Materials by :
Download or read book Novel Three-dimensional Carbon Nanotube Networks as High Performance Thermal Interface Materials written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigations of Thermal Transport in Carbon Nanotubes, Graphene and Nanoscale Point Contacts by : Michael Thompson Pettes
Download or read book Experimental Investigations of Thermal Transport in Carbon Nanotubes, Graphene and Nanoscale Point Contacts written by Michael Thompson Pettes and published by . This book was released on 2011 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: As silicon-based transistor technology continues to scale ever downward, anticipation of the fundamental limitations of ultimately-scaled devices has driven research into alternative device technologies as well as new materials for interconnects and packaging. Additionally, as power dissipation becomes an increasingly important challenge in highly miniaturized devices, both the implementation and verification of high mobility, high thermal conductivity materials, such as low dimensional carbon nanomaterials, and the experimental investigation of heat transfer in the nanoscale regime are requisite to continued progress. This work furthers the current understanding of structure-property relationships in low dimensional carbon nanomaterials, specifically carbon nanotubes (CNTs) and graphene, through use of combined thermal conductance and transmission electron microscopy (TEM) measurements on the same individual nanomaterials suspended between two micro-resistance thermometers. Through the development of a method to measure thermal contact resistance, the intrinsic thermal conductivity, [kappa], of multi-walled (MW) CNTs is found to correlate with TEM observed defect density, linking phonon-defect scattering to the low [kappa] in these chemical vapor deposition (CVD) synthesized nanomaterials. For single- (S) and double- (D) walled (W) CNTs, the [kappa] is found to be limited by thermal contact resistance for the as-grown samples but still four times higher than that for bulk Si. Additionally, through the use of a combined thermal transport-TEM study, the [kappa] of bi-layer graphene is correlated with both crystal structure and surface conditions. Theoretical modeling of the [kappa] temperature dependence allows for the determination that phonon scattering mechanisms in suspended bi-layer graphene with a thin polymeric coating are similar to those for the case of graphene supported on SiO2. Furthermore, a method is developed to investigate heat transfer through a nanoscale point contact formed between a sharp silicon tip and a silicon substrate in an ultra high vacuum (UHV) atomic force microscope (AFM). A contact mechanics model of the interface, combined with a heat transport model considering solid-solid conduction and near-field thermal radiation leads to the conclusion that the thermal resistance of the nanoscale point contact is dominated by solid-solid conduction.
Book Synopsis Three-Dimensional Carbon Architectures for Energy Conversion and Storage by : Tianyu Liu
Download or read book Three-Dimensional Carbon Architectures for Energy Conversion and Storage written by Tianyu Liu and published by Frontiers Media SA. This book was released on 2021-01-04 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Transport in One-dimensional Nanostructures by : Joseph Albert Sulpizio
Download or read book Quantum Transport in One-dimensional Nanostructures written by Joseph Albert Sulpizio and published by Stanford University. This book was released on 2011 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: One-dimensional (1D) electronic nanostructures comprise a class of systems that boast tremendous promise for both technological innovation as well as fundamental scientific discovery. To fully harness their potential, it is crucial to understand transport through 1D systems at the most fundamental, quantum level. In this thesis, we describe our investigations down three avenues of quantum transport in 1D: (1) ballistic transport in quantum wires, (2) quantum capacitance measurements of nanostructures, and (3) tunneling measurements in carbon nanotubes. First, we discuss measurements and modeling of hole transport in ballistic quantum wires fabricated by GaAs/AlGaAs cleaved-edge overgrowth, where we find strong g-factor anisotropy, which we associate with spin-orbit coupling, and evidence for the importance of charge interactions, indicated by the observation of "0.7" structure. Additionally, we present the first experimental observation of a predicted spin-orbit gap in the 1D density of states, where counter-propagating spins constituting a spin current are accompanied by a clear signal in the conductance. Next, we present the development of a highly sensitive integrated capacitance bridge for quantum capacitance measurements to be used as a novel probe of 1D systems. We demonstrate the utility of our bridge by measuring the capacitance of top-gated graphene devices, where we cleanly resolve the density of states, and also present preliminary measurements of carbon nanotube devices, where we ultimately aim to extract their mobility. Finally, we discuss a set of transport measurements in carbon nanotubes designed to probe interactions between fermions in 1D in which top gates are used to introduce tunable tunnel barriers.
Book Synopsis Thermal Transport in Isolated Carbon Nanostructures and Associated Nanocomposites by : Nayandeep Kumar Mahanta
Download or read book Thermal Transport in Isolated Carbon Nanostructures and Associated Nanocomposites written by Nayandeep Kumar Mahanta and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanostructures, namely carbon nanotubes, nanofibers and graphene, owing to their extremely high thermal conductivities, hold promise for use as fillers in materials required for thermal management of electronics. Efficient thermal characterization holds the key to understanding the heat conduction mechanisms in the particular nanostructures and continued development of materials for novel applications. The present work involves development of dedicated techniques for characterization of the thermal conduction in individual carbon nanostructures and nanocomposites. The thermal flash technique developed for characterizing individual nanostructures provides a simple, accurate and reliable means for measuring thermal conductivity while managing to avoid the issues associated with conventional techniques. The thermal conductivities measured for vapor-grown carbon nanofibers and various graphene nanoplatelets were consistent with theoretical estimates based on the fundamentals of heat conduction in solids. Moreover, the results provide valuable evidence to support existing theories for explaining the differences between the various nanoscale manifestations of graphite. The investigation on isolated nanostructures was followed with the development and characterization of epoxy nanocomposites comprising graphite and graphene as fillers with the overarching goal of preparing composites with a thermal conductivity higher than 40 W/m-K. The thermal conductivities measured for some of the nanocomposites using the dual-mode heat flow meter, a steady-state heat technique developed in this work, were higher than the highest reported value in literature. The presence of large graphite flakes in conjunction with small amounts of graphene to reduce the overall thermal interface resistance were the principal reasons behind the extremely high thermal conductivity of 42.4 ± 4.8 W/m-K (nearly 250 times enhancement) for an epoxy composite with 30 wt% of graphite and 5 wt% of graphene.
Book Synopsis Carbon Based Nanomaterials for Advanced Thermal and Electrochemical Energy Storage and Conversion by : Cheng-Te Lin
Download or read book Carbon Based Nanomaterials for Advanced Thermal and Electrochemical Energy Storage and Conversion written by Cheng-Te Lin and published by Elsevier. This book was released on 2019-07-20 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Based Nanomaterials for Advanced Thermal and Electrochemical Energy Storage and Conversion presents a comprehensive overview of recent theoretical and experimental developments and prospects on carbon-based nanomaterials for thermal, solar and electrochemical energy conversion, along with their storage applications for both laboratory and industrial perspectives. Large growth in human populations has led to seminal growth in global energy consumption, hence fossil fuel usage has increased, as have unwanted greenhouse gases, including carbon dioxide, which results in critical environmental concerns. This book discusses this growing problem, aligning carbon nanomaterials as a solution because of their structural diversity and electronic, thermal and mechanical properties. Provides an overview on state-of-the-art carbon nanomaterials and key requirements for applications of carbon materials towards efficient energy storage and conversion Presents an updated and comprehensive review of recent work and the theoretical aspects on electrochemistry Includes discussions on the industrial production of carbon-based materials for energy applications, along with insights from industrial experts
Book Synopsis A First-principles Investigation of the Transition Between Two- and Three-dimensional Thermal Transport in Graphene and Graphite by : Patrick Strongman
Download or read book A First-principles Investigation of the Transition Between Two- and Three-dimensional Thermal Transport in Graphene and Graphite written by Patrick Strongman and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional materials have become a popular research area over the past two decades because of their unique physical properties. The low dimensionality of these materials leads to interesting, and useful, transport properties such as thickness-dependent band gaps and high electrical and thermal conductivity. These materials have applications in nanoelectronics, optoelectronics, and thermoelectric energy generation, the performance of which depends sensitively on understanding and controlling how heat transport occurs. Most low dimensional materials can be derived by isolating them from their bulk counterparts, which are often comprised of stacks of the two-dimensional layers that are weakly bound together. These layered bulk materials often maintain some of the two-dimensional characteristics of their monolayer form because of the weak interlayer bonds. One common example of such a "quasi-2D" material is graphite, which is made of layered carbon sheets, i.e. graphene. When going from graphite to graphene the room-temperature in-plane thermal conductivity varies from approx. 2000 W/m K to 5800 W/m K, respectively. Both values are exceptionally high, but there is still a large difference between the two. Nevertheless, the majority of studies focus either on the bulk or low-dimensional versions of materials, with little focus on how the transition from 3D to 2D influences the microscopic properties and transport characteristics. The purpose of this study was to explain how the thermal transport properties of layered materials transition between two and three dimensions. Graphene and graphite were used as simple materials to model this transition. The thermal transport properties were calculated from first-principles using density functional theory (DFT) and iterative solutions to the Boltzmann transport equation (BTE). The transition between two and three dimensions was modelled by systematically moving the layers of graphite apart from each other until they were essentially isolated graphene sheets. The converged $\kappa$ values of the limiting cases of graphite and graphene agree with experimental measurements and previous calculations, with the stretched cases showing a monotonically increasing thermal conductivity from $\kappa_{\text{graphite}}$ to $\kappa_{\text{graphene}}$. Surprisingly, the largest variation in the thermal transport properties resulted from changes in the phonon dispersion. This is contrary to the previous belief that the difference in $\kappa$ resulted from certain three-phonon selection rules in graphene, which reduce the scattering probability, and do not apply to graphite. The selection rules appear to mostly still apply to graphite and the stretched graphite cases, indicating that the primary mechanism resulting in the differences between $\kappa_{\text{graphene}}$ and $\kappa_{\text{graphite}}$ was the shape of the phonon dispersion, and a corresponding shift in the phonon DOS. This type of analysis could be applied to other layered materials in the future to identify materials with the potential to be exceptional thermal conductors.
Book Synopsis Thermal Behaviour and Applications of Carbon-Based Nanomaterials by : Dimitrios V. Papavassiliou
Download or read book Thermal Behaviour and Applications of Carbon-Based Nanomaterials written by Dimitrios V. Papavassiliou and published by Elsevier. This book was released on 2020-04-15 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocomposites with Carbon-based nanofillers (e.g., carbon nanotubes, graphene sheets and nanoribbons etc.) form a class of extremely promising materials for thermal applications. In addition to exceptional material properties, the thermal conductivity of the carbon-based nanofillers can be higher than any other known material, suggesting the possibility to engineer nanocomposites that are both lightweight and durable, and have unique thermal properties. This potential is hindered by thermal boundary resistance (TBR) to heat transfer at the interface between nanoinclusions and the matrix, and by the difficulty to control the dispersion pattern and the orientation of the nanoinclusions. Thermal Behaviour and Applications of Carbon-Based Nanomaterials: Theory, Methods and Applications explores heat transfer in nanocomposites, discusses techniques predicting and modeling the thermal behavior of carbon nanocomposites at different scales, and methods for engineering applications of nanofluidics and heat transfer. The chapters combine theoretical explanation, experimental methods and computational analysis to show how carbon-based nanomaterials are being used to optimise heat transfer. The applications-focused emphasis of this book makes it a valuable resource for materials scientists and engineers who want to learn more about nanoscale heat transfer. Offers an informed overview of how carbon nanomaterials are currently used for nanoscale heat transfer Discusses the major applications of carbon nanomaterials for heat transfer in a variety of industry sectors Details the major computational methods for the analysis of the thermal properties of carbon nanomaterials
Book Synopsis Thermal Transport Properties of Carbon Nanotubes by : Shaun A. Wood
Download or read book Thermal Transport Properties of Carbon Nanotubes written by Shaun A. Wood and published by . This book was released on 2013 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Science and Technology of Carbon Nanotubes by : T. Yamabe
Download or read book The Science and Technology of Carbon Nanotubes written by T. Yamabe and published by Elsevier. This book was released on 1999-08-17 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotubes (CNT) is the material lying between fullerenes and graphite as a new member of carbon allotropes. The study of CNT has gradually become more and more independent from that of fullerenes. As a novel carbon material, CNTs will be far more useful and important than fullerenes from a practical point of view, in that they will be directly related to an ample field of nanotechnology. This book presents a timely, second-generation monograph covering as far as practical, application of CNT as the newest science of these materials. Most updated summaries for preparation, purification and structural characterisation of single walled CNT and multi walled CNT are given. Similarly, the most recent developments in the theoretical treatments of electronic structures and vibrational structures are covered. The newest magnetic, optical and electrical solid-state properties providing a vital base to actual application technologies are described. Explosive research trends towards application of CNTs, including the prospect for large-scale synthesis, are also introduced. It is the most remarkable feature of this monograph that it devotes more than a half of the whole volume to practical aspects and offers readers the newest developments of the science and technological aspects of CNTs.
Book Synopsis Nonlinear Electro-Thermal Transport in Metallic Carbon Nanotubes by :
Download or read book Nonlinear Electro-Thermal Transport in Metallic Carbon Nanotubes written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fabrication of Three-dimensional Nanostructures for Thermal Study by :
Download or read book Fabrication of Three-dimensional Nanostructures for Thermal Study written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Behaviour and Applications of Carbon-Based Nanomaterials by : Dimitrios V. Papavassiliou
Download or read book Thermal Behaviour and Applications of Carbon-Based Nanomaterials written by Dimitrios V. Papavassiliou and published by Elsevier. This book was released on 2020-04-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocomposites with Carbon-based nanofillers (e.g., carbon nanotubes, graphene sheets and nanoribbons etc.) form a class of extremely promising materials for thermal applications. In addition to exceptional material properties, the thermal conductivity of the carbon-based nanofillers can be higher than any other known material, suggesting the possibility to engineer nanocomposites that are both lightweight and durable, and have unique thermal properties. This potential is hindered by thermal boundary resistance (TBR) to heat transfer at the interface between nanoinclusions and the matrix, and by the difficulty to control the dispersion pattern and the orientation of the nanoinclusions. Thermal Behaviour and Applications of Carbon-Based Nanomaterials: Theory, Methods and Applications explores heat transfer in nanocomposites, discusses techniques predicting and modeling the thermal behavior of carbon nanocomposites at different scales, and methods for engineering applications of nanofluidics and heat transfer. The chapters combine theoretical explanation, experimental methods and computational analysis to show how carbon-based nanomaterials are being used to optimise heat transfer. The applications-focused emphasis of this book makes it a valuable resource for materials scientists and engineers who want to learn more about nanoscale heat transfer. Offers an informed overview of how carbon nanomaterials are currently used for nanoscale heat transfer Discusses the major applications of carbon nanomaterials for heat transfer in a variety of industry sectors Details the major computational methods for the analysis of the thermal properties of carbon nanomaterials
Book Synopsis Hybrid Nanomaterials by : Rafael Vargas-Bernal
Download or read book Hybrid Nanomaterials written by Rafael Vargas-Bernal and published by BoD – Books on Demand. This book was released on 2020-06-10 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two of the hottest research topics today are hybrid nanomaterials and flexible electronics. As such, this book covers both topics with chapters written by experts from across the globe. Chapters address hybrid nanomaterials, electronic transport in black phosphorus, three-dimensional nanocarbon hybrids, hybrid ion exchangers, pressure-sensitive adhesives for flexible electronics, simulation and modeling of transistors, smart manufacturing technologies, and inorganic semiconductors.
Book Synopsis Development of Carbon/Carbon Composites with Through-Thickness Carbon Nanotubes for Thermal and Structural Applications by :
Download or read book Development of Carbon/Carbon Composites with Through-Thickness Carbon Nanotubes for Thermal and Structural Applications written by and published by . This book was released on 2008 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon/carbon composites offer lightweight thermal protection capable of producing excellent thermal materials. To further improve the thermal conductivity along the thickness direction and the interlaminar shear strength, we studied and demonstrated a novel method to stitch carbon nanotube yarns along the through-thickness direction of carbon fiber two-dimensional precursor felt perform to make novel 3D reinforced carbon/carbon (C/C) composites. By stitching nanotube yarns, high strength and thermal conductive CNTs were incorporated into the preform to significantly reinforce and improve thermal conductivity along the thickness direction. In this study, we illustrated the effectiveness of the stitching method to improve through-thickness conductivity (Kz) through both modeling estimations and experimental studies. The C/C composites with 1wt.%-8wt.% stitched nanotube yarns were fabricated using in situ densification process with T300 plane weave precursors. The through-thickness conductivity measurements results using a laser-flash method showed the Kz values of the C/C composites samples with stitched nanotube yarns had large variations. The C/C composite samples with 8wt.% stitched nanotube yarns showed a Kz as high as 24.5W/mK, which was approximately a 44 percent increase compared to 17 W/mK conductivity of the control sample. The Rule of Mixture estimated the conductivity of the nanotube yarns is possibly in the range of 110W/mK through 375W/mK. Scanning electron microscopy (SEM) and Raman analysis also proved that the nanotubes survived after consolification and carbonization processing temperatures of 2500 to 2800?C. These results demonstrate the feasibility of using stitched nanotube yarns to effectively improve through-thickness conductivity.
