Download or read book Synthesis of TiO2 based Nanostructured Materials Using a Sol gel Process in Supercritical CO2 written by Rahima Akter Lucky and published by . This book was released on 2008 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Applications in Sol Gel Synthesis written by Usha Chandra and published by BoD – Books on Demand. This book was released on 2017-07-05 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Versatility, extended compositional ranges, better homogeneity, lesser energy consumption, and requirement of nonexpensive equipments have boosted the use of sol-gel process on top of the popularity in the synthesis of nanosystems. The sol-gel technique has not only revolutionized oxide ceramics industry and/or material science but has also extended widely into multidimensional applications. The book Recent Applications in Sol-Gel Synthesis comprises 14 chapters that deal mainly with the application-oriented aspects of the technique. Sol-gel prepared metal oxide (MO) nanostructures like nanospheres, nanorods, nanoflakes, nanotubes, and nanoribbons have been employed in biomedical applications involving drug deliveries, mimicking of natural bone, and antimicrobial activities. The possibility of controlling grain size in aerogel and preparation of ultrahigh-temperature ceramic (UHTC)-based materials, fluorescent glasses, ultraviolet photosensors, and photocatalysts have been discussed in detail by the experts in the field. The usefulness of sol-gel materials as active GRIN, as textile finisher, and as leather modifier with water-repellent and oil-resistive properties would be an incentive for researchers keen to pursue the field.
Download or read book Sol Gel Method written by Guadalupe Valverde Aguilar and published by BoD – Books on Demand. This book was released on 2019-02-13 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sol-gel method is a powerful route of synthesis used worldwide. It produces bulk, nano- and mesostructured sol-gel materials, which can encapsulate metallic and magnetic nanoparticles, non-linear azochromophores, perovskites, organic dyes, biological molecules, etc.. This can have interesting applications for catalysis, photocatalysis; drug delivery for treatment of neurodegenerative diseases such as cancer, Parkinson's and Azheimer's. In this book, valuable contributions related to novel materials synthesized by the sol-gel route are provided. The effect of the sol-gel method to synthesize these materials with potential properties is described, and how the variation of the parameters during the synthesis influences their design and allows to adjust their properties according to the desired application is discussed.
Download or read book Synthesis and Characterization of Oxide Nanostructures Via a Sol gel Route in Supercritical CO2 written by Ruohong Sui and published by . This book was released on 2007 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanostructured Titanium Dioxide in Photocatalysis written by It-Meng Low and published by CRC Press. This book was released on 2021-06-18 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide (TiO2) has drawn considerable attention as an attractive inorganic raw material for various applications due to its inexpensiveness, nontoxic nature, stability, and excellent photocatalytic activity. Photocatalysis is one of the most promising route for sustainable chemistry of the 21st century. It can contribute to solving environmental, global energy, and chemical problems, as well as to the sustainable production of commodities in the near future. This book presents the fundamentals of photocatalysis in nanostructured TiO2 and describes the factors affecting the photocatalytic activity, design, and synthesis of various forms of nanostructured TiO2. It highlights the use of ion-doping and inert-atmosphere annealing to extend the light-absorption range of photocatalysts and reduce recombination between electrons and holes. It discusses numerous applications in the fields of energy and environment, such as water purification, gas sensing, storage and delivery, and energy generation. The book is an invaluable resource and useful guide for a broad readership in various fields of catalysis, materials science, environment, and energy.
Download or read book Nano TiO2 graphene Composites for Photovoltaic and Photocatalytic Materials written by Nasrin Farhangi and published by . This book was released on 2012 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene has been recognized as one of the most exciting carbon based materials of the present decade due to its unique electronic, mechanical and thermal properties. High surface area exfoliated graphene sheets with controllable surface functionality is an attractive two-dimensional surface for attaching different metals and semiconductors for improving the performance of catalysts, sensors, photoelectronic and energy conversion devices. Graphene is an ideal material which can be used for improving various metal oxide properties such as those of titania (TiO2). TiO2/graphene composites have shown excellent properties compared to bare TiO2 in various applications. In high quality graphene sheets, electrons can travel without scattering at room temperature making them potentially ideal electron transfer bridges, that can also act as an extended charge carrier network resulting in the potential for reduced electron-hole recombination rates when in direct contact with TiO2. The absorbance capability of TiO2 has also been improved when anchored onto highly porous graphene. By chemical modification of these networks, the surface properties can be adjusted for using the composites for tailored applications. This research has focused on the synthesis and modification of TiO2 nanomaterials on the surface of graphene sheets via an acid modified sol-gel process in supercritical carbon dioxide (scCO2). Acetic acid was used as the polycondensation agent while titanium isopropoxide was used as the Ti alkoxide. The resultant materials were characterized by electron microscopy (SEM and TEM), N2 physisorption, FTIR, XRD, XPS, thermal analysis, Raman spectroscopy, UV-Vis and PL analysis. The results showed that functionalized graphene sheets containing carboxylate groups acted as templates for anchoring modified TiO2 nanoparticles and nanowires on the surface. First, sonication following by scCO2 washing was used to anchor commercial anatase TiO2 on the graphene. TiO2 nanowires were then synthesized by using a sol-gel method in the green solvent scCO2 using titanium alkoxides. Uniform TiO2 nanowires with diameters less than 40 nm were decorated on the surface of the graphene sheets. One-dimensional, precisely oriented TiO2 nanostructures are more effective than TiO2 nanoparticles as their percolation pathways are excellent for charge transfer. Fe doped TiO2 morphologies on the graphene sheets were also prepared in both organic solvents and scCO2 to extend these devices band gap into the visible region. TiO2 nanoparticles less than 5 nm were iv uniformly formed on the graphene sheets when ethanol was used as the solvent. Doped TiO2 nanoparticles and nanowires showed smaller crystal size, higher visible absorption, higher surface area and higher thermal stability compared to similar materials without graphene. However, Fe doped nanowires prepared in scCO2 showed higher surface area and photocatalytic activity than those prepared in organic solvents. ZrO2-TiO2 bimetallic nanomaterials were also synthesized on the graphene sheets in scCO2 with different morphologies including nanofibers and nanotubes depending on the initial concentrations of precursors. The synthesized materials were examined for both photocatalytic and photovoltaic performance, with both materials providing higher activity than bare TiO2 and corresponding materials without graphene. Possible interactions between TiO2 and Fe doped TiO2 with graphene sheets and functionalized graphene sheets were studied by calculating adsorption energy values using the Vienna ab-initio Simulation Package (VASP) based on density functional theory (DFT). The results showed that both physical and chemical interactions are present and responsible for stable interaction between TiO2 and graphene sheets. The resulting modified TiO2 nanostructured materials on graphene sheets exhibited a higher visible adsorption, higher surface area, smaller crystallite size, and greater thermal stability, which are all desirable features for catalysts, support materials, semiconductors, and electrodes in dye-sensitized solar cells (DSSC). Nanomaterials prepared by these simple, scalable, environmentally friendly synthesis procedures are potentially attractive for commercial employment.
Download or read book Synthesis Characterization of TiO2 Nanomaterials Using Sol Gel Method written by Stotaw Talbachew and published by LAP Lambert Academic Publishing. This book was released on 2015-08-25 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology is the future of our world. There will be a paradigm shift in the materials and application. New theories are emerging how such class of materials are functioning. In this book the simplest technique to produce advanced nanomaterial, titanium dioxide, is presented. The as synthesized nanomaterial was characterized using different techniques such as XRD, UV-Vis spectrophotometer, Transmission electron microscope (TEM), Scanning electron microscope (SEM), Energy dispersive spectroscopy (EDS).
Download or read book Titanium Dioxide Photocatalysis written by Vladimiro Dal Santo and published by MDPI. This book was released on 2019-05-27 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the seminal work of Fujishima et al. dates back to 1971, TiO2 still remains the most diffused and studied semiconductor, employed in photo-oxidation processes for cleantech (i.e., polluted water and air treatment), in solar fuel production (mainly hydrogen production by water photo splitting), and in Carbon Capture and Utilization (CCU) processes by CO2 photoreduction. The eleven articles, among them three reviews, in this book cover recent results and research trends of various aspects of titanium dioxide photocatalysis, with the chief aim of improving the final efficiency of TiO2-based materials. Strategies include doping, metal co-catalyst deposition, and the realization of composites with plasmonic materials, other semiconductors, and graphene. Photocatalysts with high efficiency and selectivity can be also obtained by controlling the precise crystal shape (and homogeneous size) and the organization in superstructures from ultrathin films to hierarchical nanostructures. Finally, the theoretical modeling of TiO2 nanoparticles is discussed and highlighted. The range of topics addressed in this book will stimulate the reader’s interest as well as provide a valuable source of information for researchers in academia and industry.
Download or read book Titanium Dioxide written by Dongfang Yang and published by BoD – Books on Demand. This book was released on 2018-06-27 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide is currently being used in many industrial products. It provides unique photocatalytic properties for water splitting and purification, bacterial inactivation, and organics degradation. It has also been widely used as the photoanode for dye-sensitized solar cells and coatings for self-cleaning surfaces, biomedical implants, and nanomedicine. This book covers various aspects of titanium dioxide nanomaterials including their unique one-dimensional, two-dimensional, mesoporous, and hierarchical nanostructures and their synthetic methods such as sol-gel, hydrothermal, anodic oxidation, and electrophoretic deposition, as well as its key applications in environmental and energy sectors. Through these 24 chapters written by experts from the international scientific community, readers will have access to a comprehensive overview of the recent research and development findings on the titanium dioxide nanomaterials.
Download or read book Metal Oxide Nanoparticles in Organic Solvents written by Markus Niederberger and published by Springer Science & Business Media. This book was released on 2009-09-17 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Oxide Nanoparticles in Organic Solvents discusses recent advances in the chemistry involved for the controlled synthesis and assembly of metal oxide nanoparticles, the characterizations required by such nanoobjects, and their size and shape depending properties. In the last few years, a valuable alternative to the well-known aqueous sol-gel processes was developed in the form of nonaqueous solution routes. Metal Oxide Nanoparticles in Organic Solvents reviews and compares surfactant- and solvent-controlled routes, as well as providing an overview of techniques for the characterization of metal oxide nanoparticles, crystallization pathways, the physical properties of metal oxide nanoparticles, their applications in diverse fields of technology, and their assembly into larger nano- and mesostructures. Researchers and postgraduates in the fields of nanomaterials and sol-gel chemistry will appreciate this book’s informative approach to chemical formation mechanisms in relation to metal oxides.
Download or read book Nanostructured Titanium Dioxide in Photocatalysis written by It-Meng Low and published by Jenny Stanford Publishing. This book was released on 2021-06-18 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide (TiO2) has drawn considerable attention as an attractive inorganic raw material for various applications due to its inexpensiveness, nontoxic nature, stability, and excellent photocatalytic activity. Photocatalysis is one of the most promising route for sustainable chemistry of the 21st century. It can contribute to solving environmental, global energy, and chemical problems, as well as to the sustainable production of commodities in the near future. This book presents the fundamentals of photocatalysis in nanostructured TiO2 and describes the factors affecting the photocatalytic activity, design, and synthesis of various forms of nanostructured TiO2. It highlights the use of ion-doping and inert-atmosphere annealing to extend the light-absorption range of photocatalysts and reduce recombination between electrons and holes. It discusses numerous applications in the fields of energy and environment, such as water purification, gas sensing, storage and delivery, and energy generation. The book is an invaluable resource and useful guide for a broad readership in various fields of catalysis, materials science, environment, and energy.
Download or read book Sol Gel Materials written by John D. Wright and published by CRC Press. This book was released on 2018-10-03 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sol-Gel processing methods, first used historically for decorative and constructional materials, were extensively developed in the last century for applications such as glasses, ceramics, catalysts, coatings, composites and fibres. Today they are reaching their full potential, enabling the preparation of new generations of advanced materials not easily accessible by other methods yet using mild, low-energy conditions. The topic is therefore increasingly included in advanced undergraduate, MSc and PhD programmes in the areas of chemistry, physics and materials science. This concise introductory text, written at the advanced undergraduate/first-year postgraduate level, is also suitable as an introduction to the development, mechanisms, chemistry, characterisation methods and applications of the technique. It provides readers with an extensive yet concise grounding in the theory of each area of the subject and details the real and potential applications and the future prospects of sol-gel chemistry.
Download or read book Sol Gel Synthesis Strategies for Tailored Catalytic Materials written by Serena Esposito and published by Springer Nature. This book was released on 2023-01-30 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the synthesis of catalytic materials with improved and tailored functionalities via the sol-gel method. Beginning with a general outline of traditional sol-gel chemistry, the book gradually explores surrounding topics, such as the formation of porous structures, while guiding the overall discussion toward the synthesis of heterogeneous catalysts and focusing throughout on the structure-activity relationship in catalytic materials. Featuring several case studies covering major current industrial applications, the book is an ideal guide for researchers looking to tailor catalytic materials for a specific catalytic process and thus exploiting the versatility of the “traditional” sol-gel method.
Download or read book 1D Oxide Nanostructures Obtained by Sol Gel and Hydrothermal Methods written by Crina Anastasescu and published by Springer. This book was released on 2016-08-30 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents wet chemical sol-gel and hydrothermal methods for 1D oxide nanostructure preparation. These methods represent an attractive route to multifunctional nanomaterials synthesis, as they are versatile, inexpensive and, thus, appropriate for obtaining a wide range of oxide materials with tailored morphology and properties. Three specific oxides (SiO2, TiO2, ZnO) are discussed in detail in order to illustrate the principle of the sol-gel and hydrothermal preparation of 1D oxide nanostructures. Other oxides synthesized via this method are also briefly presented. Throughout the book, the correlation between the tubular structure and the physico-chemical properties of these materials is highlighted. 1D oxide nanostructures exhibit interesting optical and electrical properties, due to their confined morphology. In addition, a well-defined geometry can be associated with chemically active species. For example, the pure SiO2 nanotubes presented a slight photocatalytic activity, while the Pt-doped SiO2 tubular materials act as microreactors in catalytic reactions. In the case of titania and titanate nanotubes, large specific surface area and pore volume, ion-exchange ability, enhanced light absorption, and fast electron-transport capability have attracted significant research interest. The chemical and physical modifications (microwave assisted hydrothermal methods) discussed here improve the formation kinetics of the nanotubes. The ZnO nanorods/tubes were prepared as random particles or as large areas of small, oriented 1D ZnO nanostructures on a variety of substrates. In the latter case a sol-gel layer is deposited on the substrate prior to the hydrothermal preparation. Using appropriate dopants, coatings of ZnO nanorods with controlled electrical behavior can be obtained.
Download or read book Nanostructured Materials and Systems written by Sanjay Mathur and published by John Wiley & Sons. This book was released on 2010-09-21 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Symposium on Nanostructured Materials and Systems was held during the 8th Pacific Rim Conference on Ceramic and Glass Technology (PACRIM 8) from May 31-June 5, 2009 in Vancouver, Canada. This symposium aimed to review the progress in the state-of-the-art of nanoscience and nanotechnology including synthesis, processing, modeling, applications and assessment of toxicological potential of nanomatter. More than 55 contributions (invited talks, oral presentations, and posters), were presented by participants, from all over the world, representing universities, research institutions, and industry which made this symposium an attractive forum for interdisciplinary presentations and discussions and to elaborate their functional diversity. This issue contains 16 peer-reviewed papers (invited and contributed) incorporating the latest developments related to synthesis, processing and manufacturing technologies of nanoscaled materials and systems including one-dimensional nanostructures, nanoparticle-based composites, electrospinning of nanofibers, functional thin films, ceramic membranes, bioactive materials and self-assembled functional nanostructures and nanodevices. These papers discuss several important aspects related to fabrication and engineering issues necessary for understanding and further development of processing and manufacturing of nanostructured materials and systems.
Download or read book Recent Applications in Sol Gel Synthesis written by and published by . This book was released on 19?? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Supercritical Fluids Technologies written by Igor Pioro and published by BoD – Books on Demand. This book was released on 2020-05-20 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using SuperCritical Fluids (SCFs) in various processes is not new, because Mother Nature has been processing minerals in aqueous solutions at critical and supercritical pressures for billions of years. Somewhere in the 20th century, SCFs started to be used in various industries as working fluids, coolants, chemical agents, etc. Written by an international team of experts and complete with the latest research, development, and design, Advanced Supercritical Fluids Technologies is a unique technical book, completely dedicated to modern and advanced applications of supercritical fluids in various industries.Advanced Supercritical Fluids Technologies provides engineers and specialists in various industries dealing with SCFs as well as researchers, scientists, and students of the corresponding departments with a comprehensive overview of the current status, latest trends and developments of these technologies.Dr Igor Pioro is a professor at the University of Ontario Institute of Technology, Canada, and the Founding Editor of the ASME Journal of Nuclear Engineering and Radiation Science.
