Photocatalytic Activity of Porous TiO2 Film Prepared by Dip-Coating Technique Using Sol Containing Trehalose

2009 ◽  
Vol 620-622 ◽  
pp. 691-694 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Eiji Watanabe ◽  
Hiroshi Taoda
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Film ◽  
Uv Light ◽  
Dip Coating ◽  
Coating Solution ◽  
Coating Technique ◽  
Glass Substrates ◽  
Trehalose Dihydrate ◽  
Dip Coating Technique ◽  
Hydrolysis Of

To obtain porous and thick TiO2 film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO2 film was fabricated by dip-coating technique on quartz glass substrates using this sol. The TiO2 films were calcined at 500-700 °C. The photocatalytic activity of the films was evaluated by examining decomposition of methylene blue in aqueous solution under UV light irradiation. The TiO2 film prepared from the sol with trehalose was more active than TiO2 film prepared from the sol without trehalose. The trehalose addition to the dip-coating solution was effective in improving the photocatalytic activity of the TiO2 film.

Influence of Calcination Temperature on the Microstructure of Porous TiO2 Film

2008 ◽  
Vol 569 ◽  
pp. 17-20 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Eiji Watanabe ◽  
Hiroshi Taoda
Keyword(s):  
Calcination Temperature ◽  
Tio2 Film ◽  
Dip Coating ◽  
Tio2 Films ◽  
Nanosized Particle ◽  
Porous Tio2 ◽  
Glass Substrates ◽  
Trehalose Dihydrate ◽  
Dip Coating Technique ◽  
Hydrolysis Of

To obtain porous TiO2 film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO2 film was fabricated by dip-coating technique on glass substrates using this solution. The TiO2 film was calcined at 500 °C. The maximum thickness of the film by one–run dip-coating was ca. 740 nm. The film was composed of nanosized particle and pore. The porosity of the TiO2 film was increased by the addition of trehalose dihydrate to the sol. The porous TiO2 films were calcined at various temperatures. The effects of the calcination temperature on the microstructure of the porous TiO2 film were investigated. The porous film prepared from sol containing trehalose still kept the porous structure for calcination at 950 °C. The phase transition temperature from anatase to rutile of the film was shifted from 650 to 700 °C by trehalose addition to the sol.

Microstructure Control of Porous Alumina Film Using Aqueous Sol Containing Trehalose

2007 ◽  
Vol 350 ◽  
pp. 7-10 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Kazuyuki Suzuki ◽  
Kazumi Kato
Keyword(s):  
Porous Alumina ◽  
Dip Coating ◽  
Alumina Film ◽  
Coating Solution ◽  
Coating Technique ◽  
Glass Substrates ◽  
Alumina Films ◽  
Maximum Thickness ◽  
Alumina Particles ◽  
Dip Coating Technique

To fabricate porous and thick alumina films, we prepared an aqueous alumina hydroxide sol containing trehalose. The alumina films were deposited by dip-coating technique on glass substrates and heating at 500 °C. The maximum thickness of the film obtained by one-run dip-coating using the sol containing trehalose was over 1000 nm. The film was an aggregate of alumina particles with a diameter of 20-40 nm and pores were interstices between the particles. The porosity of alumina film can be controlled in the range of 48-65 % by changing trehalose concentration in the dip-coating solution.

Effect of Calcination Temperature on the Photocatalytic Activity of Porous TiO2 Film

2010 ◽  
Vol 658 ◽  
pp. 495-498
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Eiji Watanabe ◽  
Hiroshi Taoda
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Tio2 Film ◽  
Uv Light ◽  
Dip Coating ◽  
Light Irradiation ◽  
Porous Tio2 ◽  
Glass Substrates ◽  
Uv Light Irradiation ◽  
Coating Method

To obtain porous TiO2 film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO2 film was fabricated by dip-coating method on quartz glass substrates using this sol. The TiO2 films were calcined at 500-900 °C. The photocatalytic activities of the films were evaluated by examining decomposition of methylene blue in aqueous solution under UV light irradiation. The photocatalytic activity of the porous TiO2 film showed a different tendency according to the irradiation wavelength of UV light. The activity of the film evaluated under UV light irradiation with a wavelength of 254 nm was not affected a great deal by the clacination temperature. In the case of UV light irradiation with a wavelength of 365 nm, the activity of the film increased with increasing calcination temperature and that of the film calcined at 800 °C was the highest.

Effect of SiO2 Particle Size on Optical Properties of TiO2-SiO2 Nanocomposite Thin Films

2013 ◽  
Vol 684 ◽  
pp. 67-71 ◽  
Author(s):  
Je Hun Kim ◽  
Hyun Goo Choi ◽  
Ting Zhang ◽  
Chul Han Kwon ◽  
Young Ho Kim ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Particle Size ◽  
Uv Light ◽  
Surface Characteristics ◽  
Dip Coating ◽  
Colloidal Solutions ◽  
Nano Composite ◽  
Glass Substrates ◽  
Dip Coating Technique

TiO2-SiO2thin film system is known to be very attractive to use for photocatalytic and display applications. In this study, TiO2-SiO2nano-composite solutions were prepared by adding colloidal solutions consisted of different SiO2nano-particle sizes (7-50 nm) into TiO2powder-dispersed solutions. TiO2-SiO2thin films on glass substrates were fabricated by the dip-coating technique and their crystal structure, surface morphology and photocatalytic properties were investigated as a function of SiO2particle size. While the SiO2particle size had little influence on the crystal structure of thin films, the photocatalytic activity and anti-reflectance (anti-glare) characteristics were found to be dependent on the SiO2particle size. This result could be explained in terms of surface characteristics and the order of degradation of methylene blue under UV light irradiation.

Refractive Index and Extinction Coefficient of ZnO:Al Thin Films Derived by Sol-Gel Dip Coating Technique

2013 ◽  
Vol 334-335 ◽  
pp. 290-293 ◽  
Author(s):  
N. Baydogan ◽  
T. Ozdurmusoglu ◽  
Huseyin Cimenoglu ◽  
A.B. Tugrul
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Extinction Coefficient ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Dip Coating ◽  
Optical Parameters ◽  
Coating Technique ◽  
Glass Substrates ◽  
Dip Coating Technique

Doped ZnO:Al thin films were deposited on glass substrates by the solgel dip technique. Optical parameters such as the refractive index and the extinction coefficient tend to change with increasing annealing temperature.

Preparation and Characterization of Porous Alumina Film Using Sol Containing PEG

2006 ◽  
Vol 320 ◽  
pp. 159-162 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Kazuyuki Suzuki ◽  
Kazumi Kato
Keyword(s):  
Porous Alumina ◽  
Dip Coating ◽  
Poly Ethylene Glycol ◽  
Alumina Film ◽  
Glass Substrates ◽  
Alumina Films ◽  
Poly Ethylene ◽  
Dip Coating Technique ◽  
Hydrolysis Of

To obtain porous alumina films, the precursor sol was prepared by hydrolysis of Al isopropoxide and then mixing with poly(ethylene glycol) (PEG). The porous alumina films were fabricated by dip-coating technique on glass substrates and heating at 500 °C. The film was composed of nano sized particles (30-50 nm). The maximum thickness of the film prepared by one-run dip-coating was ca. 1000 nm. The film had humidity-sensitive electrical resistance at room temperature.

A TiO2/Fe3+ Coated on Fibre Glass Treatment for Phenol with UV Irradiation

2012 ◽  
Vol 472-475 ◽  
pp. 561-564 ◽  
Author(s):  
Xi Feng Wang ◽  
Dang Cong Peng ◽  
Xiao Lian Hu
Keyword(s):  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Glass Fibre ◽  
Dip Coating ◽  
Support Surface ◽  
Fibre Glass ◽  
Coating Technique ◽  
Immobilized Catalyst ◽  
Photocatalysis Reaction ◽  
Dip Coating Technique

This paper reported the study of the photocatalytic activity of immobilized Fe3+ doped TiO2 on glass fibre yarn. A dip-coating technique fixing catalyst onto the support surface was applied to get the TiO2/Fe3+ coated filler. A photo reactor consists of a cylindrical quartz tube and filler with the immobilized catalyst was applied in the study. The photocatalytic activity was determined by the degradation of phenol in water (10 mg L-1). Results suggested that the fibre glass coated TiO2/Fe3+ photocatalysis filler has very excellent performances in repeat using and the supported TiO2 was very stable in photocatalysis reaction.

Single Layer Brushite Coating onto Stainless Steel Substrate Using Dip-Coating Technique

2011 ◽  
Vol 399-401 ◽  
pp. 2004-2007
Author(s):  
Ahmad Mulia Hafizayatullah Amiruddin ◽  
Roslinda Shamsudin ◽  
Azman Jalar ◽  
Muhammad Azmi Abdul Hamid
Keyword(s):  
Stainless Steel ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Single Layer ◽  
Dip Coating ◽  
Coating Solution ◽  
Coating Technique ◽  
Free Film ◽  
Stirring Time ◽  
Dip Coating Technique

In this study, brushite (CaHPO4·2H2O) has been coated on a stainless steel substrate using dip-coating technique. This technique offers uniform and crack-free film over entire surface of the substrate and easy to perform. Layer of brushite coated surround the stainless steel is very much affected by the parameters used namely concentration of the coating solution, speed of coating, stirring time etc. Results show that a smooth thin film is obtained when 1.5M of brushite solution is used and stirred at 50 °C for 2 hours. The optimum withdrawal rate used was 1.5 mm s-1. Thickness of the coating obtained was around 51.37 µm which would enable the apatite to growth.

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