Hybrid Carbon Modified Polymer Based Silica Aerogels With Low Thermal Conductivity And Improved Mechanical Properties
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Hybrid Carbon Modified Polymer Based Silica Aerogels With Low Thermal Conductivity And Improved Mechanical Properties
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Author : Solmaz Karamikamkar
language : en
Publisher:
Release Date : 2020
Hybrid Carbon Modified Polymer Based Silica Aerogels With Low Thermal Conductivity And Improved Mechanical Properties written by Solmaz Karamikamkar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Recently, graphene nanoplatelets (GnPs) have attracted a great deal of attention as a multifunctional reinforcing nanofiller in polymer composites, which is due to their unique two-dimensional layer structure with honeycomb characteristics, their excellent mechanical properties and their isotropic reinforcement capability in more than one direction. Here, the effect of the spinodal decomposition process in creating a nonparticulate morphology in the GnPs' orientation and dispersion is investigated. It is also studied how the gelation reaction can participate in the inclusion of GnPs in the aerogel backbone during the sol-gel process to strengthen the body of the gel. Meanwhile, the process of GnP exfoliation and restacking elimination during sol-gel transition is comprehensively studied. The present thesis also analyzes the gelation kinetics and thermodynamics in the presence of GnP and graphene oxide (GO) using in-situ rheology, light scattering (DLS), small-angle X-ray scattering (SAXS) and pore-structure-analyzer. The data collected during the gel network formation obtained with and without GnP or GO are analyzed in which to fully study the kinetics of structure evolution during the gelation. It is confirmed that the use of spinodal decomposition to create a nonparticulate gel network helps to offset the required long aging step during the sol-gel process, which is inevitable to strengthen the particle-to-particle neck using conventional methods such as nucleation and growth. It is also verified that this gelation technique enables the system to take advantage of GnP's full potential through correct exfoliation and elimination of restacking and re-agglomeration. The carbon-modified polymeric silica-based aerogels were first modified to enhance their mechanical properties by the addition of flexible nanofibers and stiff nanosheets into the structurer. The composites assembled homogeneously into the carbon-modified polymeric silica-based aerogel structure to create a uniform network of the solid struts along with the backbone. With such a network, the mechanical properties of the aerogels increased dramatically while preserving/advancing their unique features such as high surface area and thermal stability. The new aerogels could operate a high temperature with a high surface area. Furthermore, such material could resist moisture, which makes this material ideal to be used in high temperatures and humid environments.
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.
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
Preparation Of Silica Aerogels With Improved Mechanical Properties And Extremely Low Thermal Conductivities Through Modified Sol Gel Process
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Author : Yanjia Zuo
language : en
Publisher:
Release Date : 2010
Preparation Of Silica Aerogels With Improved Mechanical Properties And Extremely Low Thermal Conductivities Through Modified Sol Gel Process written by Yanjia Zuo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Reported silica aerogels have a thermal conductivity as low as 15 mW/mK. The fragility of silica aerogels, however, makes them impractical for structural applications. The purpose of the study is to improve the ductility of aerogels while retain the low thermal conductivity of silica aerogels. We have established a new synthesis route, a 3-step sol-gel processing method. The method provides better control of the formation of aerogel structures. The produced silica aerogels show much improved ductility compared to conventional methods in literatures. Furthermore, the synthesized silica aerogels have thermal conductivities as low as about 9 mW/mK, which is the lowest in all reported solids. The ultra low thermal conductivity can be explained with nano-scale structures for the silica aerogels, which have been characterized using advanced techniques including BET and SEM. We have further investigated and demonstrated the ability of enhancing mechanical properties of silica aerogels through structure modification using the proposed 3-step sol-gel processing method. The molecular-level synergism between silica particles/clusters and the doped functional materials inverts the relative host-guest roles in the produced aerogel composite, leading to new stronger and more robust low-density materials.
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
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.
Hybrid Aerogels
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Author : Krunal M. Gangawane
language : en
Publisher: Walter de Gruyter GmbH & Co KG
Release Date : 2024-06-04
Hybrid Aerogels written by Krunal M. Gangawane and has been published by Walter de Gruyter GmbH & Co KG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-06-04 with Science categories.
Aerogels are ultralight porous materials showing great promise in environmental remediation and energy storage. Aerogels successfully remove pollutants and can improve the properties of batteries, supercapacitors and even flexible electronics. The book covers the fundamentals of hybrid aerogels synthesis and their applications. It includes computational approaches such as Molecular Dynamics, lattice Boltzmann method and Navier-Stokes solver.
Development Of Novel Hybrid Silica Aerogels With A Reticulated Structure Using New Generation Of Marcromolecular Precursors
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Author : Sasan Rezaei
language : en
Publisher:
Release Date : 2020
Development Of Novel Hybrid Silica Aerogels With A Reticulated Structure Using New Generation Of Marcromolecular Precursors written by Sasan Rezaei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Aerogels (e.g. silica aerogel) have created a prospective market for oil-absorption, insulation and aerospace applications. However, their intrinsic fragility and poor mechanical properties have been a stumbling block to their wider applications. These drawbacks originate from their inherent particulate structure and weak interparticle interactions. For several decades, researchers have been trying to enhance the aerogels' mechanical properties by improving the particle-to-particle connections. However, the cost was increased processing time, increased density, and increased total thermal conductivity. Therefore, this Ph.D. research aims to find an industrially viable and fast manufacturing technology to produce ultra-light weight and mechanically robust and resilient aerogel while preserving the unique features of the aerogels such as the good thermal insulation properties and high surface area. This dissertation fundamentally addressed the difficulties associated with the improvement of the particle-to-particle connection in the conventional aerogels by inventing a novel non-particulate and reticulate structure, free from the troublesome particles. This new technology relied on the development of a new generation of polymeric silica precursor and a meticulous control of thermodynamics at gelation step. Polymeric precursors with different chemistries and molecular weights were synthesized in the preparatory stage and then through spinodal decomposition, non-particulate and reticulate aerogels were afforded. Thermodynamics variables, molecular weight of the polymeric precursor, solvent, temperature, and the amount of the nonsolvent were systematically studied and correlated to structural parameters and consequently to the final properties. It was found that there is a critical point where a particulate structure transfers to a non-particulate one. The findings have also demonstrated how to tailor the structural factors such as the void fraction, the average pore sizes to optimize the final properties. This study provided an in-depth understanding of processing-structure-property relationship and a novel technology to molecularly engineer the structure and properties of hybrid silica aerogels. Various aerogels' building blocks assemblies, polymeric precursors, and thermodynamics variables have been investigated to identify the optimal structure and processing methodology to obtain highly robust and super-insulative aerogels.
Aerogels For Energy Saving And Storage
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Author : Meldin Mathew
language : en
Publisher: John Wiley & Sons
Release Date : 2024-07-23
Aerogels For Energy Saving And Storage written by Meldin Mathew and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-07-23 with Technology & Engineering categories.
Explore the energy storage applications of a wide variety of aerogels made from different materials In Aerogels for Energy Saving and Storage, an expert team of researchers delivers a one-stop resource covering the state-of-the-art in aerogels for energy applications. The book covers their morphology, properties, and processability and serves as a valuable resource for researchers and professionals working in materials science and environmentally friendly energy and power technology. The authors offer a comprehensive review of highly efficient energy applications of aerogels that bridges the gap between engineering, science, and chemistry and advances the field of materials development. They provide a Life Cycle Assessment of aerogels in energy systems, as well as discussions of their impact on the environment. Aerogel synthesis, characterization, fabrication, morphology, properties, energy-related applications, and simulations are all explored, and likely future research directions are provided. Readers will also find: A thorough introduction to aerogels in energy, including state-of-the-art advancements and challenges newly encountered Comprehensive explorations of chitin-based and cellulose-derived aerogels, as well as lignin-, clay-, and carbon nanotube-based aerogels Practical discussions of organic, natural, and inorganic aerogels, with further analyses of the lifecycle of aerogels In-depth examinations of the theory, modeling, and simulation of aerogels Perfect for chemical and environmental engineers, Aerogels for Energy Saving and Storage will also earn a place in the libraries of chemistry and materials science researchers in academia and industry.
Death By Haggis
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Author :
language : en
Publisher: QOOP, Inc.
Release Date : 2010-04
Death By Haggis written by and has been published by QOOP, Inc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-04 with categories.