Translucent Silica Aerogel
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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).
Transparent Ultralow Density Silica Aerogels Prepared By A Two Step Sol Gel Process
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Author :
language : en
Publisher:
Release Date : 1991
Transparent Ultralow Density Silica Aerogels Prepared By A Two Step Sol Gel Process written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Conventional silica sol-gel chemistry is limited for the production of transparent ultralow-density aerogels because (1) gelation is either slow or unachievable, and (2) even when gelation is achieved, the large pore sizes result in loss of transparency for aerogels
Airglass Silica Aerogel
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Author : Sten Henning
language : en
Publisher:
Release Date : 1990
Airglass Silica Aerogel written by Sten Henning and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Insulating materials categories.
Aerogels
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Author : Jochen Fricke
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Aerogels written by Jochen Fricke 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 2012-12-06 with Science categories.
This book contains the papers presented at the "First International Sympo st sium on Aerogels (1 ISA)", held in September 1985 at. the University of Wiirzburg, Fed. Rep. of Germany. It was the first meet.ing of this kind, wit.h participants from several European count.ries, the United States of America, Canada, South America, and Africa. The meeting was interdisciplinary, with most of the participants being physicists, chemists or material scientists ei ther from universities or from industrial research institutes. Let me try to shed some light upon the class of substances the symposium was about: Aerogels are extremely porous high-tech materials, consisting ei ther of silica, alumina, zirconia, stannic or tungsten oxide or mixtures of these oxides. Due to their high porosity (up t.o 99%!) and t.heir large inner surface, aerogels serve as especially active catalysts or as catalytic subst.rates, as adsorbents, fillers, reinforcement agents, pigments and gellifying agents. Silica aerogels as translucent or transparent superinsulating fillers in window systems could help to considerably reduce thermal losses in windows and to improve the energy balance in passive solar systems. Aerogels also have fas cinating acoustic properties - the sound velocity can be as low as 100 m/s! The production of aerogels starts with the controlled conversion of a sol into a gel: The growth of clusters or polymer chains from a chemical solution, the cross-linking of these primary entities and the formation of a coherent network - still embedded in a liquid.
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.
Process For Forming Transparent Aerogel Insulating Arrays
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Author :
language : en
Publisher:
Release Date : 1986
Process For Forming Transparent Aerogel Insulating Arrays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
An improved supercritical drying process for forming transparent silica aerogel arrays is described. The process is of the type utilizing the steps of hydrolyzing and condensing aloxides to form alcogels. A subsequent step removes the alcohol to form aerogels. The improvement includes the additional step, after alcogels are formed, of substituting a solvent, such as CO.sub. 2, for the alcohol in the alcogels, the solvent having a critical temperature less than the critical temperature of the alcohol. The resulting gels are dried at a supercritical temperature for the selected solvent, such as CO.sub. 2, to thereby provide a transparent aerogel array within a substantially reduced (days-to-hours) time period. The supercritical drying occurs at about 40.degree. C. instead of at about 270.degree. C. The improved process provides increased yields of large scale, structurally sound arrays. The transparent aerogel array, formed in sheets or slabs, as made in accordance with the improved process, can replace the air gap within a double glazed window, for example, to provide a substantial reduction in heat transfer. The thus formed transparent aerogel arrays may also be utilized, for example, in windows of refrigerators and ovens, or in the walls and doors thereof or as the active material in detectors for analyzing high energy elementry particles or cosmic rays.
Synthesis And Studies Of Transparent Monolithic Polymer Silica Hybrid Aerogel Materials
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Author : Shuang Ji
language : en
Publisher:
Release Date : 2001
Synthesis And Studies Of Transparent Monolithic Polymer Silica Hybrid Aerogel Materials written by Shuang Ji and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Aerogels categories.
The Preparation And Properties Of Acid Catalyzed Silica Aerogel
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Author : William J. Schmitt
language : en
Publisher:
Release Date : 1982
The Preparation And Properties Of Acid Catalyzed Silica Aerogel written by William J. Schmitt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Colloids categories.
Sol Gel Processing And Applications
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Author : Y.A. Attia
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Sol Gel Processing And Applications written by Y.A. Attia 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 2012-12-06 with Science categories.
During my professional career, I developed a strong interest in sol-gel technology, and worked on both xerogel and aerogel systems. My fascination with aerogels has driven me to explore their commercial potential, which is currently an important component of my company's business plan. Together with my co-workers, I have also worked on the preparation of controlled PZT and silica xerogels as well as thin film coatings of metals by the sol-gel technology, These experiences convinced me of the tremendous potentials of this technology. A conviction that is shared by many scientists, engineers, and business leaders around the globe. Many sol-gel derived products are already articles of commerce. However, to expand the commercial potential of sol-gel technology, two challenges must be met: (1) the quality of sol-gel derived products must continue to meet or exceed the quality of competing products, (2) the production cost of sol-gel products (specially aerogels) must continued to decline. A key to lowering the costs of sol-gel products is finding inexpensive precursors.
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.