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Photocatalysis Applications of Titanium Dioxide Ti02

 

           
Areas of activity in titanium dioxide photocatalysis.
1 fog proof, and self cleaning glass
2 anti-bacterial, anti-viral, fungicidal
3 anti-soiling, self cleaning
4 deodorizing, air purification
5 water treatment, water purification

Titania
Titanium dioxide, also known as titania is the naturally occurring oxide of titanium, chemical formula TiO2.

You will find Ti02 in all kinds of paint, printing ink, plastics, paper, synthetic fibers, rubber, condensers, painting colors and crayons, ceramics, electronic components along with food and cosmetics.

Photocatalyst
Many studies have been published on the use of TiO2 as a photocatalyst for the decomposition of organic compounds. TiO2 is active under UV light

Photocatalytic activity (PCA) is the ability of a material to create an electron hole pair as a result of exposure to ultraviolet radiation. The resulting free-radicals are very efficient oxidizers of organic matter. Photocatalytic activity in TiO2 has been extensively studied because of its potential use in sterilization, sanitation, and remediation applications. The ability to control PCA is important in many other applications utilizing TiO2 including paint pigments and cosmetics that require low PCA.

Antimicrobial Coatings
The photocatalytic activity of titania results in thin coatings of the material exhibiting self cleaning and disinfecting properties under exposure to UV radiation. These properties make the material a candidate for applications such as medical devices, food preparation surfaces, air conditioning filters, and sanitaryware surfaces.

Titanium Dioxide Powder

Where do reserves of TiO2 exist:
1. Southeast Canada
2. Southeast USA
3. Southwest Scandinavia
5. Midwest and South Africa
6. Mediterranean Sea
7. East Australia

Application Examples
General Catalysts
Hydrogen Synthesis
Moisturizers With Spf
Lipstick With Spf
Sunscreens
Capacitors
Reflectors For Incandescent Lamps
General Pigments & Coatings
Uv Protecting Clear Coats
Reinforcements For Metal-Matrix Composites
Porous Membranes For Gas Filtration
  Titanium Dioxide can be coated on many building materials. These films exhibit a self cleaning effect due to the strong oxidizing properties. Titanium Dioxide can be coated on many building materials. These films exhibit a self cleaning effect due to the strong oxidizing properties.

 
TiO2 coated tent material
 
  A. Tiles coated photocatyltic, superhydrophilic coating

A. Tiles coated photocatyltic, superhydrophilic coating
B. ordinary painted wall tiles
TiO2 coated exterior tiles
 
  Anti-fogging glass. Generally is moist air comes in contact with glass, small droplets of water are formed, and the glass becomes fogged. On titanium dioxide coated glass, the water forms a continuous flat sheet, so that there is no fogging. Anti-fogging glass. Generally is moist air comes in contact with glass, small droplets of water are formed, and the glass becomes fogged. On titanium dioxide coated glass, the water forms a continuous flat sheet, so that there is no fogging.
TiO2 coated glass
 
  TiO2 coated tiles in an hospital environment showed the surface bacteria on the wall surfaces were reduced to zero, plus airborne bacteria counts were reduced. TiO2 coated tiles in an hospital environment showed the surface bacteria on the wall surfaces were reduced to zero, plus airborne bacteria counts were reduced.
TiO2 coated interior tiles
 

The above information are excerpts form
" Ti02 Photocatalysis Fundaments and Applications"

  
 Ti02 Photocatalysis Fundaments and Applications "TiO2 Photocatalysis Fundaments and Applications"
Dr. A. Fujishima,
Dr. K Hashimoto,
Dr. T. Watanabe
University of Tokyo
Published by BKC, Inc. May 1999
Chiyoda-ku, Tokyo
       
  Copyright 2002 All Rights Reserved
Back to Titanium Info
 

 
 
  Grade 1 Commercially Pure Titanium

Titanium is classified in two categories: commercially pure titanium (Ti) which is used in the chemical process industries and titanium alloys having such additives as aluminum (Al) and vanadium (V) and which are used for jet aircraft engines, airframes and other components.

Unalloyed and alloyed titanium have been used in medical engineering for many years. The applications are varied and include the following:

  • joint replacement parts for hip, knee, shoulder, spine, elbow and wrist,
  • bone fixation materials such as nails, screws, nuts and plates,
  • dental implants and parts for orthodontic surgery and dental prosthetics,
  • heart pacemaker housings and artificial heart valves,
  • surgical instruments for heart and eye surgery,
  • components in high-speed blood centrifuges.

Titanium has long been considered an exotic metal. In recent years there has been a progressive change in its image from an expensive curiosity to material much more familiar to consumers as it finds more commercial applications such as eyeglass frames, sports equipment, accessories and art.

Characteristics of Titanium

  1. It is lightweight with a specific gravity of 4.5, or around 50% that of copper and 60% that of iron.
     
  2. It is a strong material with a tensile strength comparable to carbon steels. With a Young\'s modulus only half that of carbon steel, titanium is soft and readily formed, with spring back greater than carbon steel.
     
  3. It has excellent corrosion resistance to seawater providing long service in offshore and marine environments.

    Commercially pure titanium resistants corrsion from acid rain and is growing in popularity for architectural application. As a building material, titanium is free from pitting corrosion, crevice corrosion or stress corrosion cracking.

    Increasing attention as an environmentally friendly metal because it does not liberate toxic heavy metal ions by corrosion. Japan started using titanium as roofing and siding material in the early Nineteen Seventies. As an Island nation, Japan finds real benefits to the corrsion properties of titanium as a building material.
     
  4. It can be formed as easily as stainless steel.
    Other factors that contribute to its diversity of application include its low coefficient of thermal expansion, absence of magnetism, and color by anodizing.

    Titanium has a smaller thermal expansion and shrinkage than stainless steel. Titanium has a linear coefficient of thermal expansion approximately 50% that of stainless steel. Therefore, it will experience smaller changes in dimensions caused by thermal expansion and shrinkage.
  
 

Grade 1, Commercially Pure Titanium Composition
Titanium 99.67
Carbon 0.08
Iron 0.03
Nitrogen 0.03
Oxygen 0.18
Hydrogen 0.015
Percentage by weight
 
Titanium Info

Photocatalysis Ti02

  
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