Self Assembly And Nanomechanics Of Freestanding Nanoparticle Thin Films

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Self-assembly and Nanomechanics of Freestanding Nanoparticle Thin Films

Author : Pongsakorn Kanjanaboos
Publisher :
ISBN 13 : 9781303423031
Total Pages : 99 pages
Book Rating : 4.4/5 (23 download)

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Book Synopsis Self-assembly and Nanomechanics of Freestanding Nanoparticle Thin Films by : Pongsakorn Kanjanaboos

Download or read book Self-assembly and Nanomechanics of Freestanding Nanoparticle Thin Films written by Pongsakorn Kanjanaboos and published by . This book was released on 2013 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis investigates a class of novel materials: freestanding nanoparticle films. The films were self-assembled from man-made "atoms," a hybrid material consisting of inorganic nanoparticle cores surrounded by a shell of capping ligands. As freestanding films that are supported by a substrate only along their edge and contain a single layer of nanoparticles, these systems represent the ultimate two-dimensional limit of nanoparticle-based solids. The main focus is on nanomechanics of ultrathin films (monolayers up to few layers) comprised of close-packed metal nanocrystals (Au, Fe/Fe3O 4, Co). Due to strong interactions between interdigitated ligands, the system exhibits remarkable tensile stiffness (Young's modulus in the range of several GPa) and high flexibility. The overall mechanical properties depend on characteristics of the nanoparticles, such as their size, and of the ligands, such as their length and organization inside the interstices between the particles. Exposing freestanding nanoparticle films to electron beams introduces strain in a highly controlled way. This process can be used to deliberately introduce strain gradients and create a variety of nanoscale patterns in the films by first cutting the films surgically with ion beams and subsequently exposing them to electron-beams. Tracking the local particle displacements during such controlled straining allowed for the first direct measurement for Poisson's ratio in nanoparticle films. Finally, we explored the performance of such ultrathin, freestanding films as nanomechanical drumhead resonators. A high-frequency scanning laser interferometer system was constructed that was capable of detecting the very small, thermally induced drumhead motion. Using this system, the spatial drumhead mode patterns were imaged for the first time.

Multilayer Thin Films

Author : Gero Decher
Publisher : John Wiley & Sons
ISBN 13 : 3527316485
Total Pages : 1157 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Multilayer Thin Films by : Gero Decher

Download or read book Multilayer Thin Films written by Gero Decher and published by John Wiley & Sons. This book was released on 2012-06-11 with total page 1157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second, comprehensive edition of the pioneering book in this fi eld has been completely revised and extended, now stretching to two volumes. The result is a comprehensive summary of layer-by-layer assembled, truly hybrid nanomaterials and thin fi lms, covering organic, inorganic, colloidal, macromolecular, and biological components, as well as the assembly of nanoscale fi lms derived from them on surfaces. These two volumes are essential for anyone working in the field, as well as scientists and researchers active in materials development, who needs the key knowledge provided herein for linking the field of molecular self-assembly with the bio- and materials sciences.

Oriented Self-Assembly of Colloidal Semiconductor Nanoplatelets on Liquid Interfaces

Author : Onur Erdem
Publisher : Springer Nature
ISBN 13 : 9811970521
Total Pages : 79 pages
Book Rating : 4.8/5 (119 download)

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Book Synopsis Oriented Self-Assembly of Colloidal Semiconductor Nanoplatelets on Liquid Interfaces by : Onur Erdem

Download or read book Oriented Self-Assembly of Colloidal Semiconductor Nanoplatelets on Liquid Interfaces written by Onur Erdem and published by Springer Nature. This book was released on 2022-10-27 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the fabrication of orientation-controlled colloidal quantum well (nanoplatelet) thin films using liquid interface self-assembly. The book details methods for orientation-controlled deposition of CdSe core nanoplatelets for characterization of directional energy transfer in nanoplatelets and layer-by-layer construction of CdSe/CdZnS core/shell nanoplatelets to create optically active waveguides with precisely tunable thickness and excellent uniformity across device scale. It also provides a future outlook for construction of large-scale two- and three-dimensional nanoplatelet superstructures and their incorporation into device fabrication.

Fabrication and characterisation of multilayer thin film using self assembly of colloidal gold and silica nanoparticles

Author : Zaheer Abbas Khan
Publisher : GRIN Verlag
ISBN 13 : 3668243042
Total Pages : 114 pages
Book Rating : 4.6/5 (682 download)

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Book Synopsis Fabrication and characterisation of multilayer thin film using self assembly of colloidal gold and silica nanoparticles by : Zaheer Abbas Khan

Download or read book Fabrication and characterisation of multilayer thin film using self assembly of colloidal gold and silica nanoparticles written by Zaheer Abbas Khan and published by GRIN Verlag. This book was released on 2016-06-20 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2011 in the subject Materials Science, Asian Insitute of Technology, language: English, abstract: A novel approach of multilayered thin film based on layer-by-layer deposition using colloidal nanoparticles was carried out in this work. The films were made by the self-assembly of oppositely charged metal and dielectric nanoparticles, alternately capped with polymers. Synthesized colloidal suspensions of gold nanoparticles (~20nm) and silica nanoparticles (~30nm) were used as the building blocks for the self-organisation of the films. Capping with PDDA and chitosan was used effectively to control the optical absorption of the surface plasmon resonance peaks of the gold nanoparticles. Using different combinations of layer formation, absorption characteristics in the near-ultraviolet (NUV), green and blue region were controlled through capping and varying the thickness of the film. Capping with chitosan or PDDA reduced the absorption peak of the coated silica nanoparticles in a similar fashion. Peak absorption in the UV range was achieved by assembling bare silica nanoparticles layers onto layers of gold nanoparticles. Transmission color was controlled (less than 1% color distance per added bi-layer) by changing the film thickness. Optical modeling of multilayer thin films constructed with oppositely charged nanoparticles helped us to understand phenomenon such as surface plasmon resonance, absorbance, transmittance and reflectance. Maxwell-Garnett effective medium theory in this case is applied in quasi-static limit to multilayer composite consisting of host material silica and inclusion material gold nanoparticles. Maxwell Garnett optical simulations is correlated with experimental spectra obtained for the thin film composites. The thickness of layers, size and spacing of metal inclusion is varied to alter the optical properties for the required device applications. The multilayered thin film of gold and silica resembles a structure consisting of large charge sheets of metal separated by a dielectric layer. When the applied electric potential reaches a threshold value, it drives the electrons to tunnel through the charge sheets producing a rectification effect. Therefore current-voltage measurements of the multilayer thin films were performed to calculate the threshold voltages. The electrical capacitance in these multilayer devices was modified with the change in thickness of the dielectric layers between two conducting layers and calculated by capacitance-voltage measurements of multilayer stack. [...]

Self-assembly of Nanoparticles in Nanometer-thin Polymer Films

Author : Zhen Liu
Publisher :
ISBN 13 :
Total Pages : 127 pages
Book Rating : 4.:/5 (964 download)

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Book Synopsis Self-assembly of Nanoparticles in Nanometer-thin Polymer Films by : Zhen Liu

Download or read book Self-assembly of Nanoparticles in Nanometer-thin Polymer Films written by Zhen Liu and published by . This book was released on 2005 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ultra-low-dielectric Constant Self-assembled Nanostructured Porous Oxide Thin Films

Author : Richard Anthony Farrell
Publisher :
ISBN 13 :
Total Pages : 462 pages
Book Rating : 4.:/5 (795 download)

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Book Synopsis Ultra-low-dielectric Constant Self-assembled Nanostructured Porous Oxide Thin Films by : Richard Anthony Farrell

Download or read book Ultra-low-dielectric Constant Self-assembled Nanostructured Porous Oxide Thin Films written by Richard Anthony Farrell and published by . This book was released on 2007 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigated the structural, film forming ability, electrical and mechanical properties of self assembled mesoporous silica thin films, microporous nanoparticle spin-on zeolite thin films and nano-composite mesoporous/microporous thin films with the potential use of employing these materials as future Back End of Line (BEoL) low dielectric constant materials is explored. Chapter 1 familiarizes the reader with the current status of low dielectric constant materials, the RC delay and future bottlenecks within the semiconductor industry concerning their speedy implementation. A summary is provided on nanostructured porous oxides synthesized by co-operative/evaporation induced self assembly (meso) and by crystallisation methods (micro/zeolites). Chapter II details the synthesis and characterisation of 2-D hexagonal ordered self-assembled mesoporous silica (MPS) thin films. The chapter establishes the individual pore size and interpore distances for all self-assembled MPS films fabricated with various templates by employing techniques such as RXRD, 2D SAXS, TEM, SEM and nitrogen physisorption. The choice of solvent used in the evaporation induced self assembly (EISA) process is also explored. Chapter III provides the techniques employed in the synthesis of colloidal microporous zeolite silicalite-1 nanoparticles with mean diameters below 100 nm. The films are highly uniform, transparent, and continuous. The crystalline nanoparticles have mean diameters of 60 nm with an average mesostructural void volume of 10-15 nm. Chapter 4 also introduces the nano-composite self-assembled mesoporous films (binder) with embedded zeolite nanoparticles. The nano-composite thin films offer increased cohesive strength over pure zeolite films whilst at the same time maintaining a low dielectric constant. Chapter IV describes the spincoating process and the variety of parameters such as sol-gel viscosity, sol-gel concentration and spinspeed exploited to control the final film thickness. Highly organized uniform porous films with film thickness values ranging from 50 nm to 800 nm can be readily synthesized. The periodicity of the films is influenced by both the shear forces and viscosity during spincoating. The intrinsic stress within the mesoporous films is quite large and can be directly correlated to the final film thickness (the critical thickness). Chapter V and Chapter VI features a comprehensive electrical study on the nanoporous dielectric films. The films exhibited high breakdown fields, low leakage currents, low dielectric constants, no frequency dispersions and low dissipation factors. The response of the films to temperature and humidity is investigated in detail. Films exhibit dielectric constants in the range of 2.32 to 2.84 depending on the porogen/pore size employed. The dominant leakage mechanism for the all the films was determined to be near Schottky type conduction assisted by space-charge-limited-conduction (SCLC) under high fields prior to breakdown. Chapter VII includes some of the on-going work on the nanomechanical properties of the self assembled films and microporous zeolite films. The films exhibit extremely low elastic modulus as a result of their inherent porosity. The mesoporous films demonstrate good adhesion properties considering their low elastic modulus whereas the zeolite films appear to have extremely low cohesive strengths. Chapter VIII summarises the work carried out within the thesis and considers the future applications of the mesoporous films. Chapter IX provides details on techniques such as small angle x-ray scattering (SAXS), chemical mechanical polishing (CMP), plasma etching (ICP), and nanoindentation (NI). The chapter also provides the calculations required for estimating the flatband voltage (Vfb) shifts, interface charge (Qint), mechanisms of current conduction (Poole-Frenkel or Schottky) and temperature dependent dielectric constants.

Characterization and Engineering of the Process of Directed Particle Self-assembly in Thin Films and Sessile Droplets

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis Characterization and Engineering of the Process of Directed Particle Self-assembly in Thin Films and Sessile Droplets by :

Download or read book Characterization and Engineering of the Process of Directed Particle Self-assembly in Thin Films and Sessile Droplets written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Directed self-assembly of colloidal particles confined between a solid and liquid interface has been studied as a versatile tool for organizing 2D and 3D crystalline arrays on solid substrates. The overarching goal of this study was to engineer the process of assembly to achieve simple and cost effective solutions for application needs were self-assembled particle structures work better than microfabricated ones. Two technologically relevant geometrical motifs of assembly were studied in detail. A thin film assembly technique based on controlled withdrawal of a meniscus was employed for modifying solid substrates with arrays of organic and inorganic colloidal particles. The assembled particles were used as a template for sterically directing the meso- and micro structure of metallic films for control over their electro-optical functionality. A sessile droplet templating technique was developed for fabricating arrays of discrete colloidal crystal patches of controlled shape and size. The process of assembly was studied in detail for each motif to optimize the deposition conditions and formulate protocols for controlling the size, composition, internal particle symmetry and overall shape. The methods and the results developed are relevant to different disciplines, including self-assembly, surface chemistry, Atomic Force Microscopy methodology, biological research and spectroscopy. Convective assembly and latex templating of gold nanoparticles was used to fabricate highly efficient nanostructured substrates for surface enhancing Raman scattering (SERS)-based sensors. The structure-dependent performance of these SERS substrates was systematically characterized with cyanide in a flow milli-fluidic chamber to simulate on-line continuous water monitoring. A matrix of experiments was designed to isolate the SERS contributions arising from meso- and microscale porosity, long range ordering of the micropores, and the thickness of the nanoparticle layer. The SERS results were.

Nanoparticle Induced Wetting of Polymer Films and Self-assembled Multilayers of Nanocomponents

Author : Rappal Sangameswara Krishnan
Publisher :
ISBN 13 :
Total Pages : 270 pages
Book Rating : 4.3/5 (129 download)

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Book Synopsis Nanoparticle Induced Wetting of Polymer Films and Self-assembled Multilayers of Nanocomponents by : Rappal Sangameswara Krishnan

Download or read book Nanoparticle Induced Wetting of Polymer Films and Self-assembled Multilayers of Nanocomponents written by Rappal Sangameswara Krishnan and published by . This book was released on 2006 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Evaporation Induced Self-assembly and Characterization of Nanoparticulate Films

Author : Yipeng Yang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (964 download)

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Book Synopsis Evaporation Induced Self-assembly and Characterization of Nanoparticulate Films by : Yipeng Yang

Download or read book Evaporation Induced Self-assembly and Characterization of Nanoparticulate Films written by Yipeng Yang and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer-based semiconducting materials are promising candidates for large-scale, low-cost photovoltaic devices. To date, the efficiency of these devices has been low in part because of the challenge of optimizing molecular packing while also obtaining a bicontinuous structure with a characteristic length comparable to the exciton diffusion length of 10 to 20 nm. In this dissertation we developed an innovative evaporation-induced nanoparticle self-assembly technique, which could be an effective approach to fabricate uniform, densely packed, smooth thin films with cm-scale area from home-made P3HT nanoparticles. Unlike the previous reports of nanoparticle-based film formation, we use a mixture of two solvents so that the solvent quality slowly decreases over time and particles aggregate at the air-liquid interface. The charge mobility of P3HT nanoparticle film fabricated using this technique is very similar to that of drop-cast P3HT films. Sintering (i.e. formation of contact discs between particles) and the effect of different size distribution of nanoparticle dispersion on film charge mobility were also studied. Binary films composed of P3HT and PCBM can be obtained using the same method from a suspension containing both P3HT and PCBM nanoparticles. The existence of PCBM in binary films was confirmed, and the relative composition of the two types of particles as a function of film-formation time was measured. Moreover, we show how to control the internal, molecular-scale structure within the P3HT nanoparticles and the absorption spectra by slowing the process of particle formation. These results provide an example of manipulating one phase of the active layer of OPV devices independently of the other phase.

Fabrication of Novel Periodic Nano(micro) Structured Thin Films for Optical Applications Based on Self-assembly Technique

Author : 巫晟逸
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Fabrication of Novel Periodic Nano(micro) Structured Thin Films for Optical Applications Based on Self-assembly Technique by : 巫晟逸

Download or read book Fabrication of Novel Periodic Nano(micro) Structured Thin Films for Optical Applications Based on Self-assembly Technique written by 巫晟逸 and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Surface Induced Self Assembly in Thin Polymer Films

Author : Georg Krausch
Publisher :
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.:/5 (348 download)

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Book Synopsis Surface Induced Self Assembly in Thin Polymer Films by : Georg Krausch

Download or read book Surface Induced Self Assembly in Thin Polymer Films written by Georg Krausch and published by . This book was released on 1995 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Directed Self-assembly in Block Polymer Thin Films

Author : Cameron K. Shelton
Publisher :
ISBN 13 : 9780355465679
Total Pages : 273 pages
Book Rating : 4.4/5 (656 download)

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Book Synopsis Directed Self-assembly in Block Polymer Thin Films by : Cameron K. Shelton

Download or read book Directed Self-assembly in Block Polymer Thin Films written by Cameron K. Shelton and published by . This book was released on 2017 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block polymers (BPs) have attracted significant attention for emerging nanotechnologies such as nanolithographic masks, nanotemplates, nanoporous membranes, organic photovolatics, and lithium ion battery membranes due to their ability to self-assembly into periodic assemblies of nanoscale features. Many of these applications require thin film geometries, which have additional confinement interactions in comparison to bulk self-assembly that must be understood to control nanostructure orientation, ordering, and alignment precisely. Two approaches to study the nuanced effects of these additional interactions are in situ characterization and neutron scattering, used concurrently or independently. With these techniques, more predictive and optimized methods to direct self-assembly can be established to unlock the full potential of BP thin films in commercial and research applications. In this dissertation work, four aspects of BP thin film self-assembly were explored with these powerful characterization tools. First, chlorosilane-modified substrate surfaces were employed to investigate the effect of the substrate-polymer interaction on nanostructure orientation and ordering. Predictive formalisms were developed that defined substrate wetting behavior, nanostructure ordering, and through-film orientation control as a function of total and decoupled (dispersive and polar) substrate-polymer interfacial energy components. Second, solvent vapor annealing was studied with in situ small-angle neutron scattering (SANS), neutron reflectometry (NR), and selective deuteration to determine how factors such as solvent-polymer interactions and solvent concentration affected BP thin film self-assembly. Next, in situ SANS during solvent vapor annealing with soft shear (SVA-SS) was used to track shear-induced nanostructure disordering and ordering. By understanding the kinetic pathways during SVA-SS, more robust and high-throughput methods to define the alignment direction(s) were developed. Lastly, lithium salt-doped poly(styrene-b-oligo[oxyethylene] methacrylate) films were investigated with NR to achieve the first high-resolution, non-destructive, and quantitative analysis regarding how lithium salts distribute within the conducting domain of BP electrolyte thin films. Overall, the work in this dissertation contributes predictive and translatable approaches to direct self-assembly and the design of powerful characterization strategies to extract key information from BP thin film systems to improve their rational design and application.

Program and Abstracts for the ... U.S. National Congress of Theoretical and Applied Mechanics

Author :
Publisher :
ISBN 13 :
Total Pages : 658 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Program and Abstracts for the ... U.S. National Congress of Theoretical and Applied Mechanics by :

Download or read book Program and Abstracts for the ... U.S. National Congress of Theoretical and Applied Mechanics written by and published by . This book was released on 2002 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:

JJAP

Author :
Publisher :
ISBN 13 :
Total Pages : 390 pages
Book Rating : 4.X/5 (6 download)

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Book Synopsis JJAP by :

Download or read book JJAP written by and published by . This book was released on 2004 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Japanese Journal of Applied Physics

Author :
Publisher :
ISBN 13 :
Total Pages : 1430 pages
Book Rating : 4.:/5 (321 download)

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Book Synopsis Japanese Journal of Applied Physics by :

Download or read book Japanese Journal of Applied Physics written by and published by . This book was released on 2004 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Micromechanics and Nanomechanics of Composite Solids

Author : Shaker A. Meguid
Publisher : Springer
ISBN 13 : 3319527940
Total Pages : 524 pages
Book Rating : 4.3/5 (195 download)

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Book Synopsis Micromechanics and Nanomechanics of Composite Solids by : Shaker A. Meguid

Download or read book Micromechanics and Nanomechanics of Composite Solids written by Shaker A. Meguid and published by Springer. This book was released on 2017-07-19 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book elucidates the most recent and highly original developments in the fields of micro- and nanomechanics and the corresponding homogenization techniques that can be reliably adopted and applied in determining the local properties, as well as the linear and nonlinear effective properties of the final architecture of these complex composite structures. Specifically, this volume, divided into three main sections—Fundamentals, Modeling, and Applications—provides recent developments in the mathematical framework of micro- and nanomechanics, including Green’s function and Eshelby’s inclusion problem, molecular mechanics, molecular dynamics, atomistic based continuum, multiscale modeling, and highly localized phenomena such as microcracks and plasticity. It is a compilation of the most recent efforts by a group of the world’s most talented and respected researchers. Ideal for graduate students in aerospace, mechanical, civil, material science, life sciences, and biomedical engineering, researchers, practicing engineers, and consultants, the book provides a unified approach in compiling micro- and nano-scale phenomena. · Elucidates recent and highly original developments in the fields of micromechanics and nanomechanics and the corresponding homogenization techniques; · Includes several new topics that are not covered in the current literature, such as micromechanics of metamaterials, electrical conductivity of CNT and graphene nanocomposites, ferroelectrics, piezoelectric, and electromagnetic materials; · Addresses highly localized phenomena such as coupled field problems, microcracks, inelasticity, dispersion of CNTs, synthesis, characterization and a number of interesting applications; · Maximizes readers’ ability to apply theories of micromechanics and nanomechanics to heterogeneous solids; · Illustrates application of micro- and nanomechanical theory to design novel composite and nanocomposite materials.

Bulk Nanostructured Materials

Author : Ruslan Z. Valiev
Publisher : John Wiley & Sons
ISBN 13 : 1118742575
Total Pages : 468 pages
Book Rating : 4.1/5 (187 download)

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Book Synopsis Bulk Nanostructured Materials by : Ruslan Z. Valiev

Download or read book Bulk Nanostructured Materials written by Ruslan Z. Valiev and published by John Wiley & Sons. This book was released on 2013-09-17 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the most recent results in the area of bulk nanostructured materials and new trends in their severe plastic deformation (SPD) processing, where these techniques are now emerging from the domain of laboratory-scale research into the commercial production of various bulk nanomaterials. Special emphasis is placed on an analysis of the effect of nanostructures in materials fabricated by SPD on mechanical properties (strength and ductility, fatigue strength and life, superplasticity) and functional behavior (shape memory effects, magnetic and electric properties), as well as the numerous examples of their innovative applications. There is a high innovation potential for industrial applications of bulk nanomaterials for structural use (materials with extreme strength) as well as for functional applications such as nanomagnets, materials for hydrogen storage, thermoelectric materials, superconductors, catalysts, and biomedical implants.