Dissertation > Excellent graduate degree dissertation topics show

Study on Coating Technology and Properties of Nanometer/Micrometer Rare Earth Particles

Author: LiuGuiXia
Tutor: SunDuoXian
School: Tianjin University
Course: Applied Chemistry
Keywords: Nano Coated Polyurethane Core - shell structure Phosphor Rare earths Room temperature solid -phase method
CLC: TB383
Type: PhD thesis
Year: 2004
Downloads: 1011
Quote: 11
Read: Download Dissertation

Abstract


Due to the salient features of the nano-micron particles coated in additional aspects of the material is modified and new functional properties, resulting in a wide range of research and application. In this thesis as a research focus on rare earth nano-micron particles coated rare earth nano-micron cladding material prepared core - shell structure with a specific function, and their properties have been studied, and some innovative results. The first time, the rare earth nano-CeO2 and water-based polyurethane composite has been coated with waterborne polyurethane microemulsions CeO2 nanoparticles, characterization of CeO2 and polyurethane through electrostatic interactions, the the chemical bonding role and the role of the media of the adsorption layer together. Coated composite material to ultraviolet light and have a good absorption effects, the composite material is expected to become an excellent ultraviolet absorbing material. Polymer composite, CeO2 nanoparticles applications possible. For the first time in the nano-SiO2 surface coated with a layer of Gd2O3: Eu rare earth complex oxide core - shell structure composite particle characterization results indicate that uniform coating layer thickness of 10-20nm; of SiO2 nuclear and Gd2O3: Eu shell between the layer of material by the action of the chemical bond Si-O-Gd bond together; cladding layer nanocrystalline size effect and the interface effect of the XRD peaks and fluorescence spectra of emission peak broadening phenomenon. Coated SiO2 never amorphous to crystal transition temperature is significantly lower. By coating can be saved in an amount of the rare earth element, greatly reducing the cost. Save valuable rare earth resources in China has important social value. (Y, Gd) BO3: Eu3 Pink material for PDP phosphor color purity weaknesses, in order to improve its color purity for the first time using the room temperature solid-phase method at the micron level (Y, Gd) BO3: Eu3 particles The surface-coated with a layer of about 10nm in the cladding layer of a uniform iron oxide. Coated (Y, Gd) BO3: color purity of Eu3 Pink has been improved. This method provides a new method to improve the purity of the red pink. Satisfied micron level Gd2O3: Eu phosphor particles, surface there are many defects and having a large specific surface area agglomerates, thus affecting the luminescent properties of the phosphor. This article was first adopted to room temperature solid-phase method in Gd2O3: Eu particles surface coated with a layer of nano-SiO2 protective layer to increase its stability. SiO2 via a chemical bond Si-O-Gd connected to Gd2O3: Eu3 surface of the particles. Gd2O3: Eu3 phosphor particles coated SiO2 still has a good luminescent properties. Coating mechanism of the above system, preliminary surface nano-coated model has certain reference value for the nano-coated and Interface Science.

Related Dissertations

  1. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  2. Multi-walled Carbon Nanotubes Au _AT_ of Pt, Au _AT_ of Pd core-shell structure of the catalyst preparation and electrochemical properties of,O643.36
  3. Preparation and Characterization of the OCS/PLLA Composite Film for Biomedical Materials,R318.08
  4. Synthesis and Biocompatibility of different types of hydrophilic surface - modified polyurethane,R318.08
  5. Silica fume wet purified preparation of spherical nano-silica,TB383.1
  6. Study on the Synthesis of the Polypyrrole-Cobalt Oxides and Their Catalytic Behavior for the Electroreduction of H2O2,O643.32
  7. Hydrophilic structure of different types of surface -modified polyurethane material and coagulation 12 factor nine peptide fragments,and fibrinogen P1 fragment of computer simulation of the interaction,O631.3
  8. Study on Technics & Performance of Nano Electroless Composite Plating on 20~# Steel,TQ153
  9. Effects of Nano-Packing on Preservation Quality of Flammulina Velutipes and Agaricus Bisporus,TS219
  10. Research on PSA/Cotton Blend Fabric of Coatinging of Water Resistance and Moisture Permeability,TS195.6
  11. Modification for PVA-Based Composite Packaging Material with Nano-SiO2 and Its Influence on Fresh Preservation Effect of Salted Duck Eggs,TS253.46
  12. Prototype Development of Intimate Apparel Mannequin,TS941.2
  13. Study on Chitosan-Based Composiate Nano-Coating Dope and Its Effect of Fresh-Keeping for Coated Egg,TS253.2
  14. Effects of Different Gas Composition and Packaging Materials on Postharvest Quality and Active Oxygen Metabolism of Flammulina Velutipes,S646.15
  15. Tolerance of Tomato on Rare Earth Elements and Its Remediation Potential on Polluted Environment,S641.2
  16. Synthesis and Properties of the new anti-clotting material in modified ammonium phosphate zwitterion,R318.08
  17. Studies on the Preparation and Nutrient Release Characteristics of Low Molecular Weight Polylactic Acid Coated Urea,S145.6
  18. The Research Report about the Storing Quality of Jiro Persimmon Treated by 1-MCP Combined with Nano-Packaging,S665.2
  19. Characteristics of Nitrogen Release and Effect on Environment of Different Kinds of Coated Urea,TQ440.1
  20. Preparation and Application of Water-based Polyurethane to Improve Wet Rubbing Fastness,TS193.2
  21. Direct Oxidation of Primary Alcohols to Methyl Esters Catalyzed by Nano-Au/SBA-16 Catalyst,TQ225.241

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile