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Topics: Titanium dioxide -- Electric properties, Titanium dioxide -- Optical properties, Titanium dioxide...
Spherical Titania (TiO2) with narrow size distribution and nice dispersibility has been obtained by hydrolysis in the mixed solvent of 1-propanol to de-ionized water under microwave assistance. The results show that the main effects on preparation of spherical TiO2 with small particle size, narrow size distribute and nice dispersibility include precursor concentration, microwave heating method and pH value. And microwave power has no obvious effect on particle morphology and size distribution.
Topics: Microwave Assisted, Spherical Titanium Dioxide, Mono-dispersed
Journal of Research of the National Bureau of Standards
Topics: Phase equilibria, polymorphism, tantalum pentoxide, titanium dioxide
This research is part of an ongoing program of study focused on dielectric materials based on a novel hypothesis: that porous electrically insulating solids in which the pores are filled with liquids containing an ionic species (such as water with dissolved salt) will have very high dielectric values by virtue of the separation of ions in the liquid phase and concurrent formation of large dipoles. Earlier work focused on the creation of super dielectric materials by saturating porous...
Topics: capacitor, supercapacitor, super dielectric material, titanium dioxide, nanotubes
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May 25, 2021
05/21
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The present paper substantiates the necessity of developing a new technology for processing titanium-containing concentrates. It describes a thermodynamic study of the process of rutile concentrate fluorination by elemental fluorine using “ASTRA” software. The study has shown that from a thermodynamic point of view, the process has no limitations. The article contains the description of the kinetic features of the process and their mathematical processing. It has been established that the...
Topics: Rutile Concentrate, Fluorination, Titanium Dioxide, Titanium Tetra fluoride, Electrolysis
Thesis (B.S..)--University of Illinois, 1914
Topics: Aluminum oxide, Electric resistance, Magnesium oxide, Titanium dioxide, Theses
Concrete is the predominant and most frequently used building material with a world wide annual material flow of 20-25 billion tons. Ultra high performance concrete (UHPC) is an emerging high-tech building material ,when compared to conventional concrete it allows more slenderness and increased durability in reinforced concrete structures. UHPC differs from conventional concrete because it consists of fine materials like quartz sand, quartz powder, silica fume. In this study , UHPC is produced...
Topics: UHPC, Micro Structural, Quartz Sand, Quartz Powder, Nano Titanium Dioxide
Water disinfection processes in the presence of titanium dioxide as a photo-catalyst material provide an interesting route to destroy contaminants, being operational in the UV-A domain with a potential use of solar radiation. In recent years, advanced oxidation processes (AOP) have been developed to meet the increasing need of an effective wastewater treatment. AOP generates powerful oxidizing agent hydroxyl radicals which completely destroy the pollutants in waste water. Solar disinfection of...
Topics: Water disinfection, Photo catalyst, Titanium dioxide, UV Radiation, Solar Radiation.
Concrete is the predominant and most frequently used building material with a world wide annual material flow of 20-25 billion tons. Ultra high performance concrete (UHPC) is an emerging high-tech building material ,when compared to conventional concrete it allows more slenderness and increased durability in reinforced concrete structures. UHPC differs from conventional concrete because it consists of fine materials like quartz sand, quartz powder, silica fume. In this study , UHPC is produced...
Topics: UHPC, Micro Structural, Quartz Sand, Quartz Powder, Nano Titanium Dioxide
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Mar 7, 2021
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M.D. Bhat, Chairman; B.V. Narayanaswamy Naidu, Member; B.N. Adarkar, Member; B.N. Das Gupta, Member; C. Ramasubban, Member; D.K. Malhotra, Secretary
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Topics: Chemical industries - India, Titanium dioxide industry - India, Titanium dioxide industry -...
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Mar 7, 2021
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M. D. Bhat Chairman; B. N. Adarkar, Member; B. N. Das Gupta, Member; C. Ramasubban, Member; Rama Varma, Secretary; M. D. Bhat, Chairman; B. N. Das Gupta, Member; C. Ramasubban, Member
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Topics: Chemical industry - India, Titanium dioxide industry - India, Titanium dioxide industry -...
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Mar 7, 2021
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K.R.P. Aiyangar, Chairman; S.K. Muranjan, Member; N. Dutta, Member; Rama Varma, Secretary
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Topics: Tariff commission-Report-India-1961, Ministry of commerce and Industry-Report-India-1961, Raw...
This paper reports an experimental investigation on the development of Gap graded concrete providing the optimal combination of strength and water permeability using M sand and admixtures. In this study, the Gap graded concrete is obtained by removing the fine aggregate wholly 0 , 5 , 10 and 15 of replacing coarse aggregate with M sand. The titanium dioxide is used as partial replacement to cement to study its behavior on mechanical properties of Gap graded concrete. Gap graded concrete trial...
Topics: Civil Engineering, Gap graded concrete, M sand, Titanium dioxide, compressive strength, permeability
Concrete is the most widely used construction materials for building technology. However, cement production releases high amounts of carbon dioxide (CO2) to the atmosphere that leads to increasing the global warming. The concrete materials also have been developed to be functioned as self-cleaning construction materials. The self-cleaning properties of the concrete are induced by introducing the photo catalytic materials such as titania (TiO2) and zinc oxide (Zn O). Self-cleaning concrete that...
Topics: Civil Engineering self cleaning, Titanium dioxide, Rhoda mine B Dye, Nitrogen Dioxide, Concrete
This research was designed to characterize the frequency response of Novel Paradigm (NP) Supercapacitors employing Nanotube Super Dielectric Materials as dielectrics. The result of tests with nine capacitors, each with a unique aqueous salt solution, provided detailed information required to design short pulse systems. This detailed information is required for engineering analysis of NP Supercapacitors in systems of interest to the U.S. Navy (USN) such as the railgun, electromagnetic aircraft...
Topics: capacitor, super dielectric material, titanium dioxide, nanotubes, ammonium chloride, sodium...
The performances of Nsu clay extender pigment in alkyd paint formulations have been studied. Xylene was used as the solvent while TiO2 formulated alkyd paint sample served as a reference in this study. The three particle sizes of the clay used in this study are 0.075, 0.15, and 0.30 mm. The physic-mechanical properties of the paint samples were evaluated according to ASTM. The study showed that paints formulated with Nsu clay had higher viscosities which increased with increases in clay...
Topics: Nsu clay, calcination temperature, extender pigments, particle sizes, titanium dioxide, alkyd...
Nano-porous titanium dioxide (TiO2) thin films were developed by UV assisted potentiostatic anodization of 99.7% pure titanium foil. The internationally popular soft drink ‘Coca-Cola’ was used as the electrolyte in this anodization process. Electrochemical oxidation and photoetching were carried out at room temperature and at 10 V potentiostatic bias without and with 400 W UV light illumination respectively. The prepared TiO2 thin film was annealed at 150ᴼC for 3 hours. The surface of the...
Topics: Electrochemical Oxidation, Coca-Cola Electrolyte, Titanium Dioxide, Nano-Porous TiO2, Hydrogen...
Investigations were performed with a view to making such devices in the surface, or in thin crystals, of vanadium dioxide. This required developing suitable crystals, testing techniques to shape, pattern and dope them, improving understanding of the electrical and optical properties of the phases and the metal-insulator transition (MIT) between them, and establishing control of the MIT. We found several improved ways to grow, manipulate, clean, pattern and dope VO2 nanobeams, rods and plates,...
Topics: DTIC Archive, WASHINGTON UNIV SEATTLE, *CRYSTALS, *NANOWIRES, *TRANSITION TEMPERATURE, DOPING,...
This project in its final form has focused on hydrogen production from ethanol and water-ethanol mixtures over a range of different gold-titania photocatalysts. Gold supported on a commercial anatase: rutile mixture has been found to be 3 times more active for hydrogen production than the previously reported gold on anatase photocatalysts. Other products detected were ethene and acetaldehyde; these products were enhanced in the presence of water. In-situ EPR spectroscopy was used to show that...
Topics: DTIC Archive, ABERDEEN UNIV (UNITED KINGDOM), *ETHANOLS, CATALYSIS, GOLD, HYDROGEN, PHOTOCHEMICAL...
In the frame of the grant W911NF-11-1-0386, this 4th interim report is focused on the fabrication of Cu2O/TiO2 nanotubes heterojunction arrays to be used in photovoltaic or photoelectrochemical solar cells. The presence of Cu2O nanoparticles on the TiO2 NTs surface may overcome the low charge separation efficiency because of the superior host structure provided spatially by the TiO2 nanotubes array besides their matched energy bands. Moreover, the highly ordered nanotube arrays creates a better...
Topics: DTIC Archive, PALERMO UNIV (ITALY), *ARRAYS, *HETEROJUNCTIONS, *PHOTOELECTRICITY, COPPER OXIDES,...
The energy empowered world demands energy from various increasing resources. The best energy alternative is offered by biodiesel to the evolutionary world. To reduce emission of diesel/ biodiesel blend and improve the engine performance, the metallic nanoparticles are added and had proven their effectiveness. This paper is focused on experimental investigation of Variable Compression Ratio (VCR) diesel engine and characteristics of emission rate of cotton seed oil biodiesel with TiO2 as a...
Topics: Titanium Dioxide, Carbon Monoxide, Hydrocarbon, Cotton Seed Oil, Specific Fuel Consumption, Carbon...
The stronger thrust on the use of renewable energy by phasing out the dependence on fossil fuels has led to an intensive research in the field of solar photovoltaics with much emphasis on materials and methods that could greatly bring down the cost of solar cells through the incorporation of suitable technologies involving greener materials that are believed to be both nature and pocket friendly. Dye sensitized solar cells are a fast emerging technology trend in the field of utilization of the...
Topics: Dye Sensitized Solar Cells, Titanium Dioxide, Manganese Dioxide, Chromium Trioxide, Spinach Dye,...
This research involved using highly accurate theoretical models to investigate the role of transition metal nano-catalysts as burn rate modifiers in composite energetic materials. Periodic density functional calculations were used to probe ammonium perchlorate adsorption on surfaces and clusters. Both TiO2 surfaces of rutile and anatase phases were constructed and their energetic and thermodynamic stability to understand electronic properties and reactivity of the most stable surface...
Topics: DTIC Archive, TOHOKU UNIV SENDAI (JAPAN), *AMMONIUM PERCHLORATE, CATALYSIS, COMBUSTION, FIRST...
Photoluminescence (PL) spectroscopy and infrared(IR)spectroscopy have been used to measure the surface condition of TiO2 powder. The adsorption of electron acceptor and donor molecules has been shown to modify band bending at the TiO2 surface. Single walled nanotubes (SWNTs) are shown to be electron acceptor molecules. The PL was used to observe the buildup during UV irradiation of surface photovoltage, and it was found that TiO2 particles, fused and pressed together by water treatment +...
Topics: DTIC Archive, VIRGINIA UNIV CHARLOTTESVILLE, *CARBON, *ELECTRON ACCEPTORS, *MOLECULES, *TITANIUM...
This thesis is part of an ongoing program exploring the means to improve the performance, particularly energy and power density, of super dielectric materials (SDM)based Novel Paradigm (NP) Supercapacitors. The underlying hypothesis is that replacing aqueous solutions with higher-voltage breakdown organic polar solvents (OPS) can increase energy density. Combinations of three different OPS and four salts were studied, as well as mixtures of OPS and aqueous solvents and organic salts. The NP...
Topics: DTIC Archive, Backer,David A, Naval Postgraduate School Monterey United States, CAPACITORS,...
The fourth passive circuit element, memristor, has attracted increased attentions since the first real device was discovered by HP Lab in 2008. Its distinctive characteristic to record the historic profile of the voltage/current through itself creates great potentials in future system design. However, as a nano-scale device, memristor is facing great challenge on process variation control in the manufacturing. In this work, we analyze the impact of the geometry variations on the electrical...
Topics: DTIC Archive, POLYTECHNIC INST OF NEW YORK BROOKLYN, *MONTE CARLO METHOD, *RESISTORS, *SPINTRONICS,...
The emerging memristor devices have recently received increased attention since HP Lab reported the first TiO2- based memristive structure. As it is at nano-scale geometry size, the uniformity of memristor device is difficult to control due to the process variations in the fabrication process. The incurred design concerns in a memristor-based computing system, e.g, neuromorphic computing, can be very severe because the analog states of memristors are heavily utilized. Therefore, the...
Topics: DTIC Archive, POLYTECHNIC INST OF NEW YORK BROOKLYN, *MONTE CARLO METHOD, *RESISTORS, *THIN FILMS,...
Ab initio calculations have been performed to model the molecular adsorption of dimethyl methylphosphonate (DMMP) on the (001) surface of the anatase form of TiO2. Both the relaxed unreconstructed (1x1)- and the (4x1)-reconstructed clean surfaces have been analyzed. Adsorption occurs via a Ti-O=P dative bond to a coordinatively unsaturated surface Ti site. In both cases, one of the two Ti-O-Ti bridge bonds at the Ti adsorption site breaks leading to the formation of a stable Ti=O titanyl group....
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV, *ADSORPTION,...
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Mar 7, 2021
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K.R. Damle, Chairman; C. Ramsubban, Member; S.K. Muranjan, Member; Rama Varma, Secretary
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Topics: Ministry of Commerce and Industry - Report - India - 1957, Department of Heavy Industries - Report...
This report results from a contract tasking Universita Milano Bicocca as follows: The Grantee will investigate with first principle quantum chemical methods the adsorption and diffusion of Cu, Ag and Au species (atoms or small aggregates) on the surface and in the bulk of titania. The Grantee will consider both stoichiometric and reduced titania, with particular attention to the interaction of the metal species with defects and irregularities in the oxide. We will investigate the effect of...
Topics: DTIC Archive, UNIVERSITA DEGLI STUDI MILANO MILAN (ITALY), *DENSITY FUNCTIONAL THEORY, *TITANIUM...
Numerical modeling predicts titanium dioxide (TiO2) based obscurants could produce MECs that exceed 10 m2/g across the visible portion of the spectrum and gFOMs of 25 m2/cm3 if TiO2 particles with a narrow size distribution were fabricated and dispersed in a nonagglomerated format. Goal of this project was to develop a visible obscurant using low toxicity TiO2 particles that improves upon the performance of existing powder based visible obscurant grenades. This goal was achieved by chemically...
Topics: DTIC Archive, NANOCOMPOSIX INC SAN DIEGO CA, *OBSCURATION, *SMOKE MUNITIONS, *TITANIUM DIOXIDE,...
Topics: DTIC Archive, Sato,S, TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY, *REACTION KINETICS, *CARBON,...
The objectives of this report are as follows: 1) Ceramic and oxide nanocrystals will be prepared and isolated; 2) Nanocrystals will be characterized structurally; 3) Kinetic studies of reaction and phase transition processes in oxide nanocrystals.
Topics: DTIC Archive, Alivisatos, A P, CALIFORNIA UNIV BERKELEY DEPT OF CHEMISTRY, *CERAMIC MATERIALS,...
A coating for metallic or polymeric composite substrates is disclosed which performs both as a primer and as a topcoat. It comprises a two component aliphatic polyurethane binder, with titanium dioxide, zinc molybdate, zinc phosphate an organo-zinc salt, and titanium dioxide vesiculted bead pigments in controlled amounts. The coating exhibits good adhesion, corrosion inhibition, flexibility, chemical and weather resistance, and opacity.
Topics: DTIC Archive, Hegedus, Charles R, DEPARTMENT OF THE NAVY WASHINGTON DC, *PROTECTIVE COATINGS,...
Comparison of methanol photochemistry at three-dimensionally (3D) networked aerogels of TiO2 or Au-TiO2 reveals that incorporated Au nanoparticles strongly sensitize the oxide nanoarchitecture to visible light. Methanol dissociatively adsorbs at the surfaces of TiO2 and Au-TiO2 aerogels under dark, high-vacuum conditions. Upon irradiation of either ultraporous material with broadband UV light under anaerobic conditions, adsorbed methoxy groups act as hole-traps and extend conduction-band and...
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC SURFACE CHEMISTRY BRANCH, *METHANOLS, *PHOTOCHEMICAL...
At the time of initiation of this research, the materials community was just becoming aware of the pioneering work on nanophase materials by Prof. Gleiter, in Germany, and the forecasts of new materials with highly desirable properties were being offered. For ceramic materials, the potential for low temperature sintering and superplastic deformation were very exciting possibilities, while the effect of nanoscale grain structures on other properties were also of interest. This research,...
Topics: DTIC Archive, Averback, R S, IDAHO UNIV MOSCOW ENGINEERING EXPERIMENT STATION, *CERAMIC MATERIALS,...
Topics: DTIC Archive, URS GREINER INC SACRAMENTO CA, *VAPOR PHASES, *TITANIUM DIOXIDE, *CHLORINATED...
Bacteriorhodopsin is an opto-electric protein found in the membrane of the extremophile bacterium Halobacterium salinarum. The protein creates a charge gradient across its 6-nm thickness and, when integrated with inorganic electron generation and transport materials such as titania nanotubes, may be useful as a new class of photon harvesters. Bacteriorhodopsin strongly absorbs light near the 570-nm wavelength, but its photoelectric activity is now shown to increase by at least 35% when...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH...
This report results from a contract tasking University of Wales Swansea as follows: This project aims to harness new techniques developed to assess the mechanisms and kinetics of paint failure in short term exposure to the results from traditional weathering experiments. This will enable a rapid test system to be developed for polyurethane coatings which currently are showing premature failures.
Topics: DTIC Archive, Worsley, David A, WALES UNIV SWANSEA (UNITED KINGDOM), *DEGRADATION, *COATINGS,...
This thesis is part of an ongoing program exploring the means to improve the performance, particularly energy and power density, of super dielectric materials (SDM)--based Novel Paradigm (NP) Supercapacitors. The underlying hypothesis is that replacing aqueous solutions with higher-voltage breakdown organic polar solvents (OPS) can increase energy density. Combinations of three different OPS and four salts were studied, as well as mixtures of OPS and aqueous solvents and organic salts. The NP...
Topics: capacitor, super dielectric material, titanium dioxide, nanotube, sodium chloride, potassium...
At the time of initiation of this research, the materials community was just becoming aware of the pioneering work on nanophase materials by Prof. Gleiter, in Germany, and the forecasts of new materials with highly desirable properties were being offered. For ceramic materials, the potential for low temperature sintering and superplastic deformation were very exciting possibilities while the effect of nanoscale grain structures on other properties were also of interest. This research therefore,...
Topics: DTIC Archive, Averback, Robert S, ILLINOIS UNIV AT URBANA-CHAMAPIGN, *CERAMIC MATERIALS, *TITANIUM...
Two areas of research are described: (1) Studies of the surface and photochemical properties of TiO2 surfaces; (2) study of the factors influencing the use of carbon nanotubes for adsorption. This work connects to the use of TiO2 and carbon nanotubes for environmental remediation. TiO2 is shown to be an active material for photochemical oxidation of organophosphorous compounds; carbon nanotubes are strong adsorbents for small molecules which can fit into the nanotube interior.
Topics: DTIC Archive, Yates, John T , Jr, PITTSBURGH UNIV PA DEPT OF CHEMISTRY, *PHOTOCHEMICAL REACTIONS,...
This report covers experiments demonstrating that the decomposition of water is catalytic at 23 C when a platinized, powdered titanium dioxide catalyst, illuminated with band-gap radiation, is used. (Author)
Topics: DTIC Archive, Sato,S, TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY, *WATER, *CATALYSTS, *TITANIUM...
The overall goal of this project was to generate information to help improve the performance of titanium dioxide (TiO2) dispersal grenades used for visual obscuration. The study evaluated ways to improve the performance of TiO2 through the investigation of the impact of adsorbed water on the TiO2 obscuration performance and techniques for moisture removal, along with the evaluation of handling and packaging to maintain the dry state. Improvement would be manifested by increased obscurance...
Topics: DTIC Archive, ARMY EDGEWOOD CHEMICAL BIOLOGICAL CENTER APG MD, *GRENADES, *OBSCURATION, *TITANIUM...
Within the forbidden range of electron energies between the valence and conduction bands of titanium dioxide, crystal lattice irregularities lead to the formation of electron trapping sites. These sites are known as shallow trap states, where shallow refers to the close energy proximity of those features to the bottom of the semiconductor conduction band. For wide bandgap semiconductors like titanium dioxide, shallow electron traps are the principle route for thermal excitation of electrons...
Topics: DTIC Archive, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG, *CONDUCTION BANDS, *TITANIUM...
The effect of titanium oxide (TiO2) thickness on hysteresis behavior in non-volatile, metal-insulator-metal resistive random access memory (RRAM) was investigated using a Zr40Cu35Al15Ni10 (ZCAN) amorphous metal bottom electrode and an indium (In) top electrode. Due to the atomically flat nature of the amorphous ZCAN contact, the switching behavior of very thin metal oxides can be more accurately measured, unlike in aluminum (Al) or titanium (Ti) films, which typically have a surface roughness...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *ELECTRODES,...
The goal of this program is the development of a 65% volume solids, sprayable (airless electrostatic method), polyurethane exterior aircraft coating meeting MIL-C-83286 performance specifications. A high solids coating can significantly reduce solvent emissions and help the Air Force meet EPA/OSHA requirements for reduced environmental pollution and increased worked safety. One formulation consisting of a combination of Acryloid AU-568 (oxazolidine), NIAX PCP-0300 (polyol), and Desmodur N-100...
Topics: DTIC Archive, McKay, Gretchen, DE SOTO INC DES PLAINES IL, *SOLIDS, *COATINGS, *SPRAYERS, EMISSION,...
This project covered efforts to develop and test the field-emission and particle sensing devices (FED and PSD) using carbon nanotubes (CNTs), and SiC capped Si nanotips (SiNTs) arrays. Additional studies focused on tungsten nanotips. The report covers successes on all efforts, including structural characterization and tip performance.
Topics: DTIC Archive, Chen, Li-Chyong, NATIONAL TAIWAN UNIV TAIPEI CENTER FOR CONDENSED MATTER SCIENCES,...
Heterogeneous semi-conductor photocatalysis of chloroform (CHCl3) has been demonstrated on titanium dioxide (TiO2) particles that were grafted on cotton fabric and on TiO2 particles that were embedded in glass fabric Modified TiO2 particles were grafted onto cotton fabric and irradiated in the presence of CHCl3 vapor The synthesis of the system is described and FTIR results of the decomposition of CHCl3 are discussed TiO2 particles were also embedded in glass fabric and irradiated in the...
Topics: DTIC Archive, Gaddy, G A, ARMY RESEARCH LAB ADELPHI MD, *PHOTOCHEMICAL REACTIONS, *FABRICS,...
