Download or read book Sol Gel Synthesis and Characterization of Neodymium Ion Doped Nanostructured Titania Thin Films written by Andrew Burns and published by . This book was released on 2001 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nd doped TiO2 nanostructured thin films were prepared by sol-gel technique on quartz and Si substrates using TiCl4 precursor. As-deposited amorphous films were annealed to form anatase phase in the thin films. The film grain size increased with annealing temperature. Above 800 deg C, rutile began to segregate and the grain size decreased slightly. The photodegradation of 2-chlorophenol (2-CP) was studied. Doping TiO2 with Nd(+3) reduced the photodegradation time. The difference in the ionic radii of Nd(+3) and Ti(+4) and the oxygen affinities of Nd and Ti were responsible for this effect. These differences help promote electron trapping, thereby increasing the lifetime of the holes which are responsible for the oxidation of 2-CP.
Download or read book Synthesis and Characterization of Titania based Thin Films for Sensor Applications written by Benjamin Elden Wilson and published by . This book was released on 2005 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Attempts to develop various methods for producing TiO2(titanium oxide) thin films using pulsed laser deposition and sol-gel synthesis. Characterizes the thin films using SEM (scanning electron microscope) and XRD (x-ray diffraction). Models photocatalysis kinetic data acquired from a previous experiment done by Young et al.
Download or read book Nanostructured Titanium Dioxide Materials written by Ali Reza Khataee and published by World Scientific. This book was released on 2012 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past decade, research and development in the area of synthesis and applications of different nanostructured titanium dioxide have become tremendous. This book briefly describes properties, production, modification and applications of nanostructured titanium dioxide focusing in particular on photocatalytic activity. The physicochemical properties of nanostructured titanium dioxide are highlighted and the links between properties and applications are emphasized. The preparation of TiO2 nanomaterials, including nanoparticles, nanorods, nanowires, nanosheets, nanofibers, and nanotubes are primarily categorized by their preparation method (sol-gel and hydrothermal processes). Examples of early applications of nanostructured titanium dioxide in dye-sensitized solar cells, hydrogen production and storage, sensors, rechargeable batteries, electrocatalysis, self-cleaning and antibacterial surfaces and photocatalytic cancer treatment are reviewed. The review of modifications of TiO2 nanomaterials is mainly focused on the research related to the modifications of the optical properties of TiO2 nanomaterials, since many applications of TiO2 nanomaterials are closely related to their optical properties. Photocatalytic removal of various pollutants using pure TiO2 nanomaterials, TiO2-based nanoclays and non-metal doped nanostructured TiO2 are also discussed.
Download or read book Nanotechnology in the Beverage Industry written by Abdeltif Amrane and published by Elsevier. This book was released on 2020-05-08 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology in the Beverage industry: Fundamentals and Applications looks at how nanotechnology is being used to enhance water quality, as well as how the properties of nanomaterials can be used to create different properties in both alcoholic and no-alcoholic drinks and enhance the biosafety of both drinks and their packaging. This is an important reference for materials scientists, engineers, food scientists and microbiologists who want to learn more about how nanotechnology is being used to enhance beverage products. As active packaging technology, nanotechnology can increase shelf-life and maintain the quality of beverages. In the field of water treatment, nanomaterials offer new routes to address challenges. Describes the major properties that make nanomaterials good agents for increasing the purification of water and other beverages Outlines major nanoencapsulation techniques for use in a variety of beverage types Discusses the major challenges of using nanomaterials in both beverages and beverage packaging
Download or read book Preparation and Characterization of Sol gel Derived Titania silica Thin Films written by Young-Min Kwon and published by . This book was released on 1996 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanophase and Nanocomposite Materials IV Volume 703 written by Sridhar Komarneni and published by . This book was released on 2002-04 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Download or read book Nanophase and Nanocomposite Materials written by and published by . This book was released on 2002 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Sol gel Derived Tantalum Oxide Tantalum Nitride and Nickel alumina Thin Films written by Gerald Thomas Kraus and published by . This book was released on 1997 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Nanostructured Copperindiumdisulfide and Titaniumdioxide Thin Films for Solar Cell Application written by Angela Wochnik and published by . This book was released on 2012 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Titanium Dioxide written by Magdalena Janus and published by BoD – Books on Demand. This book was released on 2017-07-26 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide is mainly used as a pigment and photocatalyst. It is possible to find it in food, cosmetics, building materials, electric devices, and others. This book contains chapters about characteristics of anatase and rutile crystallographic structure of titanium dioxide and the use of theoretical calculation for photoactivity determination.
Download or read book Template assisted Sol gel Synthesis of Carbon Doped Titanium Dioxide Nanotubes and Their Characterization written by Nwabisa Takata and published by . This book was released on 2017 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Preparation and Characterization of Stable Macroporous Titania Nano wells written by Hema Santhi Aluri and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Silica based sol-gel thin films have been extensively studied because of their advantages that include optical transparency, high biodegradability and low intrinsic fluorescence. However, one concern with silica based sol-gel derived materials is their long term stability in aqueous solutions. Another concern is their limited porosity. These two concerns limit the application of these materials in catalysis and separations. The main objective of this study is to prepare porous, thin films using titanium alkoxides as precursors and evaluate their long term stability in aqueous solutions. Colloidal crystal templating will be used to introduce macrosized pores into the titania network. The materials will be characterized using SEM and AFM. To prove that the templated films provide access to the underlying surface of the electrode, a conducting metal like copper was electrodeposited inside the nano-wells. The stability of titania and silica films will be evaluated over a two month period using cyclic voltammetry with three redox probes.
Download or read book Structuring and filling of titania films for applications in photovoltaics written by Monika Rawolle and published by Cuvillier Verlag. This book was released on 2013-04-02 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kurzbeschreibung Die Möglichkeiten, Titandioxid Nanostrukturen zu synthetisieren, sowie die erhaltenen Strukturen rückzubefüllen, werden mit Hinblick auf Anwendungen in der Photovoltaik in der vorliegenden Arbeit untersucht. Auf Titandioxid basierende Solarzellen werden in Hybridsolarzellen und in Farbstoffsolarzellen unterteilt. Das Hauptaugenmerk der Untersuchungen liegt auf der Korrelation zwischen Morphologie und Funktion der resultierenden Strukturen. Die verschiedenen untersuchten Systeme und die damit verbundenen Fragestellungen umfassen zum einen die Strukturierung von Titandioxid und zum anderen das Rückbefüllen dieser Strukturen. Die Synthese von Titandioxid wird mittels Sol-Gel Chemie vorgenommen. Die Strukturen werden in der Synthese durch Blockcopolymertemplate vorgegeben. Die damit hergestellten dünnen Filme von Titandioxid zeigen eine hohe Porosität, mit einer Schwammartigen Morphologie die sowohl Mesoporen als auch Makroporen aufweist. Die Strukturen werden in dünnen Filmen und in einem nanostrukturierten Tropfen untersucht. Eine Verbesserung der Strukturen durch die Kombination der Sol-Gel Synthese mit Mikrofluidik wird ebenfalls diskutiert. Zudem wird eine mögliche Syntheseroute bei niedrigen Temperaturen vorgestellt, die es erlaubt kristallines Titandioxid zu erhalten. Die Stabilität der Strukturen gegen die Kapillarkräfte bei der Infiltrierung von Wasserdampf wird getestet. Um funktionierende Solarzellen zu erhalten, müssen die Titandioxidnanostrukturen mit einem lochleitenden Material gefüllt werden. Der Grad der Rückbefüllung mit lochleitenden Materialien korreliert mit der Funktion in Solarzellen. Description In the presented thesis, the possibilities to synthesize titania nanostructures and the possibilities to fill the resulting nanostructures by other materials are investigated for photovoltaic applications. The solar cells based on titania are distinguished either as hybrid or as dye-sensitized solar cells. The main focus of the investigations lies on the correlation of the morphology and the functionality of the obtained thin films. The different investigated systems and related questions comprise the structuring of titania on the one hand, and the filling of the structures on the other hand. Sol-gel chemistry in combination with block copolymers as structure templates is applied to obtain titania thin films with a sponge-like morphology, which shows a high porosity and both mesopores and macropores. The structures are investigated in thin films, but also in a nanostructured drop of titania. Improvement of the structures by the combination of micro-fluidics with the templated sol-gel is also discussed. Furthermore, a low temperature synthesis route is examined to obtain crystalline titania. The stability of the resulting titania films is checked for water vapor infiltration with the resulting capillary forces. In order to obtain working solar cells, the titania nanostructures need to be filled by hole-conducting materials. The degree of filling of the structures with hole-conducting organic materials is related to the functionality of the solar cells.
Download or read book Synthesis and Characterisation of M doped Titanium Dioxide for the Potential Application in Electrochemical Devices written by Laura R. Sayers and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of systems intended to produce metal-doped, nanostructured oxide materials containing titaniumffV) has been investigated. Manganese and iron were chosen as cheap, sustainable metal atom dopants with a view to possible use of product materials in electrochemical devices. In particular, the aim was to enhance electronic conductivity and to introduce psudocapacitance for investigation in supercapacitor devices. Previous literature in this area was found to be misleading; products of earlier synthetic studies have been incompletely characterised, with solid products being assumed to be single crystalline phases and metal atom contents being assumed on the basis of hypothetical doping levels rather than being determined analytically. Electrochemical properties of product materials in electrode films were determined in this study via use of EIS, CV and galvanostatic charge- discharge techniques. Conventional sol-gel and micro-emulsion synthetic methods were undertaken with the view to control of product particle sizes and yields for single phase, Mn-doped titaniumfl V) oxide (ideally within the anatase structure). Other than for the pure binary oxides of manganese or titanium, the products obtained were mixtures of oxides rather than single phases, with titaniumfl V) in the rutile polymorph within the I mixed-phase products. "Doped" product materials produced by the emulsion method showed no improvements in conductivity or specific capacitance when compared with a standard anatase (undoped) sample. The mixed-oxide materials produced by the sol-gel method, containing Mn02, had enhanced conductivities but no improvement in specific capacitance. Single-phase, anatase structured, Mn-doped titanium dioxide materials, were prepared using the continuous hydrothermal synthesis (CHS) method. The maximum amount of Mn successfully incorporated into the .anatase structure was found to be approximately 8%wt, as determined by AAS, ICP-MS and SEM-EDX analytical methods; high Mu-content resulted in phase segregation and irreversibility within cyclic voltammograms, as evident in observation of an oxidation peak but no reduction peak. The highest recorded specific capacitance value for these samples was that for the CHSMn008 sample (theoretical composition Tio.92Mno.os02), with a value of 4.5 F g'l (oxide specific surface area, 34.8 m2 g·l). This compared to a similarly prepared anatase (undoped) material with a specific surface area of 48.6 m2 g'l and a specific capacitance of 2.5 F g·l. No correlation between specific surface areas and specific capacitance values was observed, but the BET-determined ·specific surface areas were for powdered samples whereas capacitances refer to composite electrode films. Chapter 1 Introduction • ", The initial eHS product materials displayed no improvement in conductivity, but p H-adjusted synthesis led to samples (denoted CHS MnKOH) with higher conductivities consequent on higher Mn contents, and these samples also had the highest specific capacitance values. In view of the success of the eHS method in producing Mn-doped anatase materials, it was also used to synthesise Fe-doped titaniumffV) oxides. The products were a range of single phase materials, but syntheses aimed at high Fecontents led to mixtures, Ti02 + Fe oxides + Fe2Ti05; the maximum amount of Fe incorporated whilst still maintaining a pure single phase product was approximately 7%wt. The conductivity of these materials showed marked improvement relative to the standard (undoped) anatase sample, comparable to those for eHS MnKOH samples, but the Mn-doped samples had higher specific capacitances than Fe-doped counterparts . . The highest specific capacitance values recorded were between 25 and 32 F g'l, regardless of dopant (MnlFe) and/or phase purity, and were associated with a high specific surface area or a high concentration of "dopant" within the sample. 1.
Download or read book Visible Light Active Photocatalysis written by Srabanti Ghosh and published by John Wiley & Sons. This book was released on 2018-03-29 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and timely overview of this important and hot topic, with special emphasis placed on environmental applications and the potential for solar light harvesting. Following introductory chapters on environmental photocatalysis, water splitting, and applications in synthetic chemistry, further chapters focus on the synthesis and design of photocatalysts, solar energy conversion, and such environmental aspects as the removal of water pollutants, photocatalytic conversion of CO2. Besides metal oxide-based photocatalysts, the authors cover other relevant material classes including carbon-based nanomaterials and novel hybrid materials. Chapters on mechanistic aspects, computational modeling of photocatalysis and Challenges and perspectives of solar reactor design for industrial applications complete this unique survey of the subject. With its in-depth discussions ranging from a comprehensive understanding to the engineering of materials and applied devices, this is an invaluable resource for a range of disciplines.
Download or read book Recent Trends in Materials and Devices written by Vinod Kumar Jain and published by Springer. This book was released on 2016-10-20 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of the International Conference on Recent Trends in Materials and Devices, which was conceived as a major contribution to large-scale efforts to foster Indian research and development in the field in close collaboration with the community of non-resident Indian researchers from all over the world. The research articles collected in this volume - selected from among the submissions for their intrinsic quality and originality, as well as for their potential value for further collaborations - document and report on a wide range of recent and significant results for various applications and scientific developments in the areas of Materials and Devices. The technical sessions covered include photovoltaics and energy storage, semiconductor materials and devices, sensors, smart and polymeric materials, optoelectronics, nanotechnology and nanomaterials, MEMS and NEMS, as well as emerging technologies.
