Dissertation > Excellent graduate degree dissertation topics show

Characterization and mechanism of the titanium dioxide surface envelope

Author: WangZuo
Tutor: YanJiKang
School: Kunming University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Titanium dioxide Surface Thermodynamics Acid soluble rate oil absorption
CLC: TQ621.12
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
Read: Download Dissertation

Abstract


Titania, as an important white pigment with excellent covering power and whiteness, is widely used in paints, plastics, paper, rubber, fiber, graphite and cosmetics. Untreated titanium dioxide particles is very small, with high specific surface energy, and are very unstable. Larger particles were formed soon, that is metastable. For a certain amount of TiO2, the smaller the particles are, the stronger the gravitational attraction among particles are the easier the particles aggregate. TiO2 must be surfacely treated for practical application, i.e. form a continuous coating of film on the surface of TiO2 particles. Many aterials were used for coated titanium dioxide, but so far the most widely used inorganic coated at home and abroad is silicon, aluminum, zirconium compounds and other substances, that in a certain concentration of TiO2 slurry by adding acidic or alkaline pack film, then alkali or acid to make film coating in a certain pH conditions to form hydrated oxide particles deposited on the surface of TiO2.Al2(SO4)3.18H2O and Na2SiO3-9H2O were used for inorganic coated agent; HO(CH2CH2O)nH, C6H15O3N and Na(ClgH35O2) were used for organic coated agent. By means of liquid phase deposition method, the experiment for inorganic coatings on TiO2 particles were made under different conditions, composite particles with a surface layer coated on untreated TiO2.Then the surface of TiO2 was modified the effects on coating results were studied under different technological conditions.The technological parameters were decided according to the change of acid solubility, dispersion of TiO2 particles after coating.In addition,The thermodynamic analysis of coated Titania was studied in this paper. Ion concentration was woked out in different pH value and different temperature. Theoretical value of ion concentration was got and compared with theoretical value.Experimental results show that:by mesns of studing the relation between the height of dear water layer in settling experiment, grain size distribution and dispersing agent,pH value,temperature and dispersing agent were key factors. Dispersity of titania were influenced on them. It was founded that:recombination coatings was the best way in the surface modification of titanium dioxide.the optimal coming method of recombination coatings was 3% silica and 5% alumina; suspension pH=10 coming; reaction temperature was 80℃.Furthermore the thermodynamics TiO2 inorganic coating is analyzed and calculated, Ion concentration were calculated in different pH value,different temperature .and ion got,Theoretical comparison were compared with the experimental value.

Related Dissertations

  1. Density Functional Theory Study of Dimethyl Ether Adsorption on the Low-Index Pt Surface,O485
  2. Research on Optical Surface Testing with Interferometers,TG84
  3. Study on Springback of High-Strength Steel Stamping,TG386
  4. Study on Theory and Experiment of Wire Drawing with Composite Ultrasonic Vibration,TG663
  5. Measurement of the Surface Impedance of the High Temperature Superconducting Thin Films with Coplanar Transmission Line,O484.5
  6. Investigation of Turbine S2 Stream Surface Direct Problem Aerodynamic Optimization Design,V235.11
  7. Simulation and Experimental Study on the Scattering Properties of Two Dimensional Rough Surfaces,TP391.41
  8. Pavement Distress Recognition Based on Image,TP391.41
  9. Studies on Extraction, Isolation, Purification and Antioxidation Activity of Flavonoids from the Fruits of Avicennia Marina,S793.9
  10. Electroporation Assisted Surface-enhanced Raman Spectroscopy for Living Cells,R318.51
  11. Computing Minimum Distance between Curves/Surfaces Based on PSO Algorithm,O182
  12. Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst,O614.411
  13. Study on Application of Non-phosphate Additive in Frozen Penaeus Vannamei and Mechanism of Water-holding,TS254.4
  14. The Combined Effect of Several Environmental Factor on Fertilization, Hatching and Juvenile Growth of Nile Tilapia,S917.4
  15. Preparation of Crop Stalk-Based Sorption Materials with High Performances and Their Applications for Pah Removal from Water,X712
  16. Synthesis and Biocompatibility of different types of hydrophilic surface - modified polyurethane,R318.08
  17. Adsorption Effects of Phosphate and Chromium from Aqueous Solution by Adsorption Using LDH and Mg/Fe/Al Modified Montmorillonites,X703
  18. 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
  19. Lipase-catalyzed Transesterification of Lard to Produce L-ascorbyl Fatty Acid Esters,TS221
  20. Recovery Sulphur from Zinc Concentrate of Pressure Acid Leaching Residue,X751

CLC: > Industrial Technology > Chemical Industry > Pigment Industry > Achromatic pigments > White pigment > Titanium dioxide,calcium titanium dioxide
© 2012 www.DissertationTopic.Net  Mobile