Nanostructured Silica Aerogel
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Nanostructured Silica Aerogel
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Author : Pradip B. Sarawade
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2011-01
Nanostructured Silica Aerogel written by Pradip B. Sarawade and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-01 with categories.
In recent years, interest in the preparation and characterization of the na-noporous materials has grown due to their distinctive properties and potential applications. Among them, silica aerogel are transparent, highly porous and lightest synthetic solids. Silica aerogels, prepared by sol-gel method followed by supercritical drying, have various extraordinary properties viz. low density ( 20 mg/cm3) and thermal conductivity (0.05 W/mK), low sound velocity ( 100 m/s) and large surface area (> 1500 m2/g). Due to this unique combination of properties, aerogels are considered as a new class solid state porous material having various scientific and technological applications like super insulating transparent fillers in double walled windows, catalytic supports, Cerenkov detectors, filters and containers for capturing of micrometeorites in space. However, economic large-scale industrial production of silica aerogels is hampered by expensive supercritical drying methods. The present book describes the results of detailed studies made on the synthesis and characterization of silica aerogels and related nano-porous materials by various methods and precursors at ambient pressure.
Translucent Silica Aerogel
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Author : Cinzia Buratti
language : en
Publisher:
Release Date : 2019
Translucent Silica Aerogel written by Cinzia Buratti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Aerogels categories.
Silica translucent aerogels are unique materials able to improve the thermal insulation performance of buildings without compromising daylight transmission. The aim of the book is to give a general overview on state of the art research on translucent aerogels and their applications in buildings and to provide a data set about thermal and physical properties, useful in buildings' energy performance simulation and design.Silica aerogels are nanostructured solid materials made of approximately 96% air and 4% silica. They show a thermal conductivity in the 0.012-0.020 W/mK range and excellent optical properties, especially visible transmission. They come in granular and monolithic form. Granular aerogels are relatively easy to produce and less expensive than monolithic panes, but show worse optical and thermal performance. Monolithic aerogels enable vision through the material, but their fabrication process is not developed at an industrial scale.The book collects the contributions of experts in the field of translucent aerogels from all over the world. The contents of the eight chapters are detailed as follows:Chapter 1 is the contribution from Union College, Schenectady (USA). The chapter reviews the chemical approaches to silica wet gels preparation, the drying methods used to yield monoliths, and the challenges and limitations associated with its production.Chapter 2 is a contribution from EMPA, Dübendorf (Switzerland). It is a review of current state of the art research on silica aerogel granulate production, including raw materials selection, hydrophobization strategies, and drying methodologies. Chapter 3 is a contribution from Takenaka Corporation, Tokyo (Japan). The main techniques for the optical properties evaluation are described and data are provided. An original application of translucent aerogels in buildings and future research topics are also proposed.Chapter 4 is a contribution from Recep Tayyip Erdogan University, Rize and Ataturk University, Erzurum (Turkey). A review of the thermal properties of aerogels is provided, highlighting their better performance when compared to conventional and superinsulation materials.Chapter 5 is a contribution from the University of Perugia, Perugia (Italy). The acoustic properties of both granular and monolithic systems are investigated. For example, the influence of granule size and layer thickness that is deepened for granular aerogels is discussed, while for the monolithic form, the little data that is currently available is reported on. Chapter 6 is a contribution from the University of Tuscia, Viterbo (Italy) and Buro Happold Ltd, London (UK). It is focused on Life Cycle Assessment of silica aerogel, showing the research challenges in understanding its environmental impact, lower than the one of conventional thermal insulating glazing systems.Chapter 7 is a contribution from the University of Lyon and INSA-Lyon, Lyon (France). An overview of measurement methods and modeling tools available in literature is provided and a summary of the main mechanical properties of both monolithic and granular aerogels is reported on.Chapter 8 is a contribution from the Norwegian University of Science and Technology, Trondheim and SINTEF, Trondheim (Norway). Authors present their experimental investigations on various aerogel systems in different building envelopes (new aerogel glass material, aerogel-incorporated concrete, and so forth).
Aem And Hrem Evaluation Of Carbon Nanostructures In Silica Aerogels
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Author :
language : en
Publisher:
Release Date : 1994
Aem And Hrem Evaluation Of Carbon Nanostructures In Silica Aerogels written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Nanostructured carbon has been deposited in silica aerogels by chemical vapor infiltration using acetylene or ferrocene at moderate temperatures. Using analytical electron microscopy and high-resolution electron microscopy, we have observed various carbon rings and nanotubes in the silica aerogel-based carbon composite. Both X-ray microanalysis and nano-probe diffraction techniques have been used to confirm the presence of those carbon nanostructures. Morphologies and structural properties of the carbon nanotubes and rings have also been examined in detail.
Aerogels Handbook
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Author : Michel Andre Aegerter
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-06-10
Aerogels Handbook written by Michel Andre Aegerter and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-10 with Technology & Engineering categories.
Aerogels are the lightest solids known. Up to 1000 times lighter than glass and with a density as low as only four times that of air, they show very high thermal, electrical and acoustic insulation values and hold many entries in Guinness World Records. Originally based on silica, R&D efforts have extended this class of materials to non-silicate inorganic oxides, natural and synthetic organic polymers, carbon, metal and ceramic materials, etc. Composite systems involving polymer-crosslinked aerogels and interpenetrating hybrid networks have been developed and exhibit remarkable mechanical strength and flexibility. Even more exotic aerogels based on clays, chalcogenides, phosphides, quantum dots, and biopolymers such as chitosan are opening new applications for the construction, transportation, energy, defense and healthcare industries. Applications in electronics, chemistry, mechanics, engineering, energy production and storage, sensors, medicine, nanotechnology, military and aerospace, oil and gas recovery, thermal insulation and household uses are being developed with an estimated annual market growth rate of around 70% until 2015. The Aerogels Handbook summarizes state-of-the-art developments and processing of inorganic, organic, and composite aerogels, including the most important methods of synthesis, characterization as well as their typical applications and their possible market impact. Readers will find an exhaustive overview of all aerogel materials known today, their fabrication, upscaling aspects, physical and chemical properties, and most recent advances towards applications and commercial products, some of which are commercially available today. Key Features: •Edited and written by recognized worldwide leaders in the field •Appeals to a broad audience of materials scientists, chemists, and engineers in academic research and industrial R&D •Covers inorganic, organic, and composite aerogels •Describes military, aerospace, building industry, household, environmental, energy, and biomedical applications among others
Advances In Aerogel Composites For Environmental Remediation
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Author : Aftab Aslam Parwaz Khan
language : en
Publisher: Elsevier
Release Date : 2021-05-29
Advances In Aerogel Composites For Environmental Remediation written by Aftab Aslam Parwaz Khan and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-05-29 with Science categories.
Advances in Aerogel Composites for Environmental Remediation presents both contextual information aboutaerogels and details about their application in environmental remediation. A wide variety of aerogels are discussed, rangingfrom common to advanced and from natural to synthetic. By exploring ongoing research and developments in the environmentalremediation technologies using aerogel and its composites, this book addresses common day-to-day environmental problemsand presents solutions to the use of aerogel materials. The chapters discuss fabrication of various aerogel composites, alongwith their design and applications toward different environmental remediation technologies. Additionally, the properties andadvantages of aerogels are compared and contrasted to those of traditional materials. Given the consistent increase in environmental pollution, there is an urgent need to explore new materials for advances in remediationtechnology. Advances in Aerogel Composites for Environmental Remediation brings researchers and practitionersin the fields of environmental remediation, environmental science, and engineering to the forefront of remediation technologieswith a thorough breakdown of the benefits of and techniques relevant to aerogel composites. Covers basic properties, unique properties, and fabrication techniques of aerogels, from basic silica aerogels topresent-day conventional aerogels Discusses most of the major environmental remediation techniques and the advantages of using aerogels for theseremediation techniques in comparison to using traditional methods Presents future prospects for utilizing aerogels in modern day-to-day life and in the fabrication of tangible new products
Synthesis And Characterization Of The Mechanical Behavior Of Mechanically Strong Porous Nanostructured Materials
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Author : Habel Gitogo Churu
language : en
Publisher:
Release Date : 2013
Synthesis And Characterization Of The Mechanical Behavior Of Mechanically Strong Porous Nanostructured Materials written by Habel Gitogo Churu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Aerogels categories.
Aerogels are three-dimensional assemblies of nano-particles that are typically synthesized through the sol-gel process and then dried by replacing the pore filling solvent with air. This work presents a robust method to manufacture both organic and inorganic aerogel so that mass production can be done more easily and at a substantially low cost of production. The inherent problems associated with typical aerogel materials such as fragility, hydrophilicity as well as requirement to use supercritical drier are addressed by nano-casting a conformal polymer layer on inorganic templated aerogels, while the microstructure of organic aerogels are refined so that they can be dried in ambient condition. Thus large pieces of aerogels have been synthesized and characterized to ascertain the mechanical properties so that design of components and structures can be done with ease. The first part of this work deals with inorganic templated silica aerogels whose morphology has been optimized to overcome fragility and allow for large samples to be produced. As such a microstructure akin to the naturally occurring honeycomb structure is produced resulting in a material, whose energy absorption is about 187 j/g, indicating that they are far stronger than most manmade materials in production. The second part of this work present a careful synthesis of organic polyurea aerogels whole morphology is varied from nano fibrous at the low density end to nano particulate at the high density end. By so doing we synthesized a nanostructured material which can be dried in ambient conditions at a much lower bulk density (0.2 g/ cm3) that earlier reported. In addition the materials have very high dimensional stability such that they retain their shape and size from the mold even after ambient drying. With that, this work seeks to resolve the inherent problems of aerogel materials, both organic and inorganic that makes them hard to economically mass produce.
Silica Based Materials For Advanced Chemical Applications
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Author : Mario Pagliaro
language : en
Publisher: Royal Society of Chemistry
Release Date : 2009
Silica Based Materials For Advanced Chemical Applications written by Mario Pagliaro and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Science categories.
This clear and concise book is the first to address the hot topic of functional silica gels and their applications.
Synthesis Of Nanostructured Materials In Near And Or Supercritical Fluids
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Author : Can Erkey
language : en
Publisher: Elsevier
Release Date : 2021-11-27
Synthesis Of Nanostructured Materials In Near And Or Supercritical Fluids written by Can Erkey and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-11-27 with Technology & Engineering categories.
Synthesis of Nanostructured Materials in Near and/or Supercritical Fluids: Methods, Fundamentals and Modeling offers a comprehensive review of the current status of research, development and insights on promising future directions, covering the synthesis of nanostructured materials using supercritical fluid-based processes. The book presents fundamental aspects such as high-pressure phase behavior of complex mixtures, thermodynamics and kinetics of adsorption from supercritical solutions, mechanisms of particle formation phenomena in supercritical fluid-based processes, and models for further development. It bridges the gap between theory and application, and is a valuable resource for scientists, researchers and students alike. Includes thermodynamic and mass transfer data necessary for industrial plant design Explains the mechanisms of reactions in a supercritical fluid environment Lists numerous industrial processes for the production of many consumer products
Aerogels I
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Author : Inamuddin
language : en
Publisher: Materials Research Forum LLC
Release Date : 2020-11-15
Aerogels I written by Inamuddin and has been published by Materials Research Forum LLC this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-15 with Technology & Engineering categories.
This book focuses on aerogels and their applications in such areas as energy storage, thermal storage, catalysis, water splitting and environmental remediation. The materials covered include nanocellulose-, porous-, silica-, hybrid silica-, carbon-, graphene- and magnetic aerogels. Ways of modulating the pore structure of aerogels are presented, as well as surface modifications and the application of coatings. Future perspectives focus on functional foods, thickeners, stabilizers, and scaffolding in tissue repair. Keywords: Aerogels, Nanocellulose Aerogels, Non-Silicate Aerogels, Organic Aerogels, Composite Hybrid Aerogels, Carbon-based and Graphene-based Aerogels, Biogels, Hybrid Silica-based Aerogels, Energy Storage, Thermal Storage, Catalysis, Water Splitting, Environmental Remediation, Absorbents, Gas Filters, Packaging Materials, Electrical Devices, Thermal Insulations, Fire Retardants, Pharmaceutical and Biomedical Applications, Functional Foods, Thickeners, Stabilizers, Scaffolding in Tissue Repair.
Silica Aerogel Composites
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Author : Mahesh Sachithanadam
language : en
Publisher: Springer
Release Date : 2016-01-13
Silica Aerogel Composites written by Mahesh Sachithanadam and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-01-13 with Technology & Engineering categories.
This book explores the improvement in thermal insulation properties of protein-based silica aerogel composites fabricated by a novel, inexpensive and feasible method. The resulting material exhibits polymeric foam behavior including high compressibility, super-hydrophobic qualities and excellent strain recovery in addition to low thermal conductivity. The fabrication methodologies are explained in great detail and represented in flowcharts for easy reference and understanding. This monograph gives readers a new perspective on composite fabrication using methods other than the traditional ones and explores the endless ways of altering the composition to modify the properties of the silica aerogel composites. Applications for this novel composite are diverse and range from those in the pharmaceutical and aerospace industries to the oil and gas industries.