Download or read book Linking the Structure and Mechanical Behavior of Nanoporous Gold written by Ye Sun and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure and Property Linkage of Nanoporous Materials written by Haomin Liu and published by . This book was released on 2021 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nanoporous metals have recently been drawn significant interest in various fields of research. Their open-cell structure and high surface area per unit volume give them unique electrical, mechanical, and catalytic properties as well as high radiation resistance. These properties make nanoporous metals excellent candidates for a variety of high-tech applications including catalysts, biosensors, and actuators. However, the mechanical properties of nanoporous metals have not yet been well determined. Scaling relations linking the mechanical properties of nanoporous materials to their dense counterparts are found not to agree with experimental determinations. This work focuses on integrating computational simulations, continuum modeling, and deep learning techniques to gain data-driven insights about the relationships between the nanostructure and mechanical properties of nanoporous gold. We investigate the effect of structural components; ligaments and nodes on the mechanical properties of the nanoporous materials. In addition, we developed a mathematical model incorporating the bending and stretching deformation modes of ligaments to predict the stiffness of the nanoporous structure based on continuum theory. Moreover, we proposed an interpretable deep learning strategy incorporating the three-dimensional convolutional neural network and interpretation technique. This new relation is found to correctly describe the mechanical properties of nanoporous Copper (Cu)"--Page viii.
Download or read book On the Factors Impacting the Mechanical Response of Nanoporous Gold polymer Composites written by Murilo P. Hablitzel and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoporous gold (NPG) is a bicontinuous network of nanoscale gold ligaments and pores, the dimensions of which can be adjusted to exploit strengthening at small ligament sizes. Nevertheless, its mechanics are limited by the lack of ductility under tensile loading. Recently, the impregnation of the open porous structure with an epoxy phase created a metal-polymer composite that combined strengthening at small structural length-scales with enhanced tensile ductility. The present work aims to clarify the effect of factors influencing the mechanical behaviour of composite materials, particularly the properties of the epoxy phase and interface - properties that are still unexplored in NPG-epoxy composites. To this end, a series of novel approaches were developed to investigate the independent contribution of each factor, focusing on the development of representative model samples, micromechanical testing, and finite element simulation. A novel method to understand the effect of the composite microstructure in the epoxy was made possible by isolating the matrix phase. Taking inspiration from mining techniques, an approach based on gold etching in iodine-iodide solutions successfully leached out the Au from NPG-polymer composites. The remaining bi-continuous open porous polymer (NPP) was investigated using nanoindentation to explore possible size effects as those found in nanoporous gold. The interface was investigated using a model system where a single planar boundary between gold and epoxy was achieved. Using both nanoindentation approaches and novel microshear experiments, the interphase regime and interfacial strength were measured. Moreover, the experimental results inspired a modelling approach of the interfaces for finite element simulations, which was employed to study the interfacial behaviour as a function of the balance between the properties of constituent phases and interfaces. The interfacial model was also employed to simulate the effect of the interfacial strength on the mechanical response and delamination evolution of NPG-epoxy composites. The findings from the investigations on the isolated factors improved the interpretation of the composite mechanical response. No evidence of a structural length-scale effect in the polymer was found, and the response of the isolated polymer phase could be well predicted by an isostrain law applied to the properties measured on the bulk polymer. Furthermore, no evidence supporting the presence of an interlayer was found between the gold and epoxy phases. The measurement of the interfacial strength showed that the interface in NPG-epoxy composite is the weakest link in the composite's deformation, which was also observed in the simulations. The isolated effect of the interfacial properties was attenuated in the composite by the interconnected structure, which in compression allows the load transfer even after interface failure.
Download or read book Nanoporous Gold written by Arne Wittstock and published by Royal Society of Chemistry. This book was released on 2012-03-28 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-surface-area materials have recently attracted significant interest due to potential applications in various fields such as electrochemistry and catalysis, gas-phase catalysis, optics, sensors and actuators, energy harvesting and storage. In contrast to classical materials the properties of high-surface-area materials are no longer determined by their bulk, but by their nanoscale architecture. Nanoporous gold (np-Au) represents the fascinating class of mesoporous metals that have been intensively investigated in recent years. The current interest and the increasing number of scientific publications show that np-Au by itself is an outstanding nano-material that justifies a book devoted to all aspects of its properties and applications. The resulting publication is a discussion of this unique nano-material and is an accessible and comprehensive introduction to the field. The book provides a broad, multi-disciplinary platform to learn more about the properties of nanoporous gold from an inter-disciplinary perspective. It starts with an introduction and overview of state-of-the-art applications and techniques characterizing this material and its applications. It then covers the progress in research within the last years. The chapters are in-depth overviews written by the world's leading scientists in the particular field. Each chapter covers one technique or application so that the reader can easily target their favoured topic and will get the latest and state-of-the-art information in the field.
Download or read book Noble and Precious Metals written by Mohindar Seehra and published by BoD – Books on Demand. This book was released on 2018-07-04 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of copper, silver, gold and platinum in jewelry as a measure of wealth is well known. This book contains 19 chapters written by international authors on other uses and applications of noble and precious metals (copper, silver, gold, platinum, palladium, iridium, osmium, rhodium, ruthenium, and rhenium). The topics covered include surface-enhanced Raman scattering, quantum dots, synthesis and properties of nanostructures, and its applications in the diverse fields such as high-tech engineering, nanotechnology, catalysis, and biomedical applications. The basis for these applications is their high-free electron concentrations combined with high-temperature stability and corrosion resistance and methods developed for synthesizing nanostructures. Recent developments in all these areas with up-to-date references are emphasized.
Download or read book Micro and Nano Mechanical Testing of Materials and Devices written by Fuqian Yang and published by Springer Science & Business Media. This book was released on 2009-02-28 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscale and nanostructured materials have exhibited different physical properties from the corresponding macroscopic coarse-grained materials due to the size confinement. As a result, there is a need for new techniques to probe the mechanical behavior of advanced materials on the small scales. Micro and Nano Mechanical Testing of Materials and Devices presents the latest advances in the techniques of mechanical testing on the micro- and nanoscales, which are necessary for characterizing the mechanical properties of low-dimensional materials and structures. Written by a group of internationally recognized authors, this book covers topics such as: Techniques for micro- and nano- mechanical characterization; Size effects in the indentation plasticity; Characterization of low-dimensional structure including nanobelts and nanotubes; Characterization of smart materials, including piezoelectric materials and shape memory alloys; Analysis and modeling of the deformation of carbon-nanotubes. Micro and Nano Mechanical Testing of Materials and Devices is a valuable resource for engineers and researchers working in the area of mechanical characterization of advanced materials.
Download or read book Nanoporous Gold written by Arne Wittstock and published by Royal Society of Chemistry. This book was released on 2012 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a broad, multidisciplinary platform to learn more about the properties of nanoporous gold from an interdisciplinary perspective from an overview of state-of-the-art applications and techniques to the latest research progress.
Download or read book Nanoporous Metals for Advanced Energy Technologies written by Yi Ding and published by Springer. This book was released on 2016-03-19 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the state-of-the-art research in nanoporous metals for potential applications in advanced energy fields, including proton exchange membrane fuel cells, Li batteries (Li ion, Li-S, and Li-O2), and supercapacitors. The related structural design and performance of nanoporous metals as well as possible mechanisms and challenges are fully addressed. The formation mechanisms of nanoporous metals during dealloying, the microstructures of nanoporous metals and characterization methods, as well as miscrostructural regulation of nanoporous metals through alloy design of precursors and surface diffusion control are also covered in detail. This is an ideal book for researchers, engineers, graduate students, and government/industry officers who are in charge of R&D investments and strategy related to energy technologies.
Download or read book Structural Tailoring of Nanoporous Metals and Study of Their Mechanical Behavior written by Lei Wang and published by . This book was released on 2013 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data based Analysis of Nanoporous Metals written by Claudia Richert and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, a comprehensive workflow for an FE beam modeling approach was developed, which allows to predict the macroscopic elastic and plastic mechanical behavior of nanoporous structures. An in-depth characterization of various geometrical and topological descriptors provided detailed insights about the comparability of experimental nanoporoug gold and computer-generated structures. The combination of the macroscopic mechanical predictions by FE simulations and the structural descriptors derived for the over one hundred computer-generated structures enabled to propose an improved scaling law.
Download or read book Surface controlled Mechanical Properties of Bulk Nanoporous Gold written by Nadiia Mameka and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study highlights a smart hybrid material based on nanoporous gold in an aqueous electrolyte whose stiffness and strength are reversibly tuned by external stimuli. The tunability of these effective mechanical properties is realized via application of electric potentials to the large gold-electrolyte interface of the material, and consequent control of the surface state through electrical polarization and adsorption. The experiments are implemented in situ under environmental control in a dynamic mechanical analyzer and a mechanical testing device. The results of the in situ experiments provide conclusive evidence for the impact of surface excess elasticity on the effective elastic response of nanostructures and support a hypothesis that surface tension is a dominant factor in controlling their plasticity.
Download or read book A Course on Damage Mechanics written by Jean Lemaitre and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new branch of science usually develops thus. Somebody publishes the basic ideas. Hesitatingly at first, then little by little, other original contributions appear, until a certain threshold is reached. Then, overview articles are printed, conferences are held, and a first mention is made in textbooks, until specialized monographs are written. Continuum darnage mechanics has reached that status now. To analyze or, if possible, to predict the failure of machine parts or other structures is one of the main goals of engineering science. Consequently fracture mechanics became one of its leading branches. It was based on the analysis of existing cracks. However, especially under conditions of cyclic loading, this might be too late to prevent a disaster. Therefore, the question regarding the precursory state, that is, the evolution of intemal darnage before macrocracks become visible, was then posed. One of the successful approaches to the problern was Weibull's theory which examined, in a statistical manner, the "weakest link" in the material volume under consideration. Unfortunately it proved too difficult mathematically to be applied to complicated parts or structures. Therefore it was highly appreciated by the scientific of material community when L. M. Kachanov published in 1958 a simple model darnage which subsequently could be extended to brittle elastic, plastic or viscous materials under all conditions of uniaxial or multiaxial, simple or cyclic loadings, so that it may be considered nearly universal.
Download or read book Studying the Structure and Mechanical Properties of Nanoporous Materials by Advanced Tomography and in Situ Mechanical Testing written by Thomas Przybilla and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thin Film Materials written by L. B. Freund and published by Cambridge University Press. This book was released on 2004-01-08 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin film mechanical behavior and stress presents a technological challenge for materials scientists, physicists and engineers. This book provides a comprehensive coverage of the major issues and topics dealing with stress, defect formation, surface evolution and allied effects in thin film materials. Physical phenomena are examined from the continuum down to the sub-microscopic length scales, with the connections between the structure of the material and its behavior described. Theoretical concepts are underpinned by discussions on experimental methodology and observations. Fundamental scientific concepts are embedded through sample calculations, a broad range of case studies with practical applications, thorough referencing, and end of chapter problems. With solutions to problems available on-line, this book will be essential for graduate courses on thin films and the classic reference for researchers in the field.
Download or read book ALD Functionalized Nanoporous Gold written by and published by . This book was released on 2011 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoporous metals have many technologically promising applications but their tendency to coarsen limits their long-term stability and excludes high temperature applications. Here, we demonstrate that atomic layer deposition (ALD) can be used to stabilize and functionalize nanoporous metals. Specifically, we studied the effect of nanometer-thick alumina and titania ALD films on thermal stability, mechanical properties, and catalytic activity of nanoporous gold (np-Au). Our results demonstrate that even only one-nm-thick oxide films can stabilize the nanoscale morphology of np-Au up to 1000 C, while simultaneously making the material stronger and stiffer. The catalytic activity of np-Au can be drastically increased by TiO2 ALD coatings. Our results open the door to high temperature sensor, actuator, and catalysis applications and functionalized electrodes for energy storage and harvesting applications.
Download or read book Physical Metallurgy written by David E. Laughlin and published by Newnes. This book was released on 2014-07-24 with total page 2963 pages. Available in PDF, EPUB and Kindle. Book excerpt: This fifth edition of the highly regarded family of titles that first published in 1965 is now a three-volume set and over 3,000 pages. All chapters have been revised and expanded, either by the fourth edition authors alone or jointly with new co-authors. Chapters have been added on the physical metallurgy of light alloys, the physical metallurgy of titanium alloys, atom probe field ion microscopy, computational metallurgy, and orientational imaging microscopy. The books incorporate the latest experimental research results and theoretical insights. Several thousand citations to the research and review literature are included. - Exhaustively synthesizes the pertinent, contemporary developments within physical metallurgy so scientists have authoritative information at their fingertips - Replaces existing articles and monographs with a single, complete solution - Enables metallurgists to predict changes and create novel alloys and processes
Download or read book Nanomechanical and Scaling Behavior of Nanoporous Gold written by Nicolas Jérôme Briot and published by . This book was released on 2015 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
