Titanium dioxide–nickel oxide composite coatings: Preparation by mechanical coating/thermal oxidation and photocatalytic activity

2014 ◽  
Vol 24 ◽  
pp. 138-145 ◽  
Author(s):  
Yun Lu ◽  
Liang Hao ◽  
Kou Matsuzaka ◽  
Hiroyuki Yoshida ◽  
Hiroshi Asanuma ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Nickel Oxide ◽  
Thermal Oxidation ◽  
Composite Coatings ◽  
Oxide Composite ◽  
Mechanical Coating

Study of anticorrosive nature of spray coated titanium dioxide and nickel oxide composite thin films on stainless steel in briny surroundings

2019 ◽  
Author(s):  
Muhamed Shajudheen V. P. ◽  
Saravana Kumar S. ◽  
Senthil Kumar V. ◽  
Uma Maheswari A. ◽  
Sivakumar M. ◽  
...  
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Titanium Dioxide ◽  
Nickel Oxide ◽  
Composite Thin Films ◽  
Oxide Composite

Preparation and Photocatalytic Activity of TiO2-Copper Oxides Composite Coatings by Mechanical Coating Technique and Heat Oxidation

2015 ◽  
Vol 719-720 ◽  
pp. 13-16
Author(s):  
Yun Lu ◽  
Liang Hao ◽  
Kou Matsuzaka ◽  
Hiroyuki Yoshida ◽  
Su Jun Guan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Composite Coatings ◽  
High Photocatalytic Activity ◽  
Copper Oxides ◽  
Coating Technique ◽  
Composite Microstructure ◽  
Mechanical Coating

Photocatalytic TiO2–Copper oxides composite coatings were prepared by the mechanical coating technique (MCT) and subsequent heat oxidation. The results showed that Cu particles were mainly adhered to the surfaces of the Ti–Cu composite coatings. After heat oxidation,the Ti coatings were partly oxidized to rutile TiO2 and a Ti–TiO2–Cu2O–CuO composite microstructure was formed. These composite coatings had relative high photocatalytic activity because of the formation of the TiO2–Ti composite microstructure and TiO2–Cu2O–CuO p–n heterojunctions.

Influence of Oxidation Temperature on Photocatalytic Activity of Cr-TiO2 Coatings by Mechanical Coating Technique

2015 ◽  
Vol 833 ◽  
pp. 177-180
Author(s):  
Su Jun Guan ◽  
Yun Lu ◽  
Liang Hao ◽  
Shunsuke Takaya ◽  
Kohei Miyazawa ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Mass Fraction ◽  
Oxidation Process ◽  
Composite Coatings ◽  
Oxidation Temperature ◽  
Sem Images ◽  
Coating Technique ◽  
Ti Powder ◽  
Mechanical Coating ◽  
Structure And Microstructure

The photocatalyst coatings on alumina (Al2O3) balls had been prepared by mechanical coating technique (MCT) and subsequent oxidation process with Ti powder and Cr powder, and the influence of oxidation temperature on the photocatalyst composite coatings (Cr-TiO2) were investigated. The contrast experiments of the oxidation temperature and the usage of Cr powder had been carried out. The crystal structure and microstructure of the coatings were investigated. Photocatalytic activity of the coatings was evaluated and discussed. The XRD results showed that the mixed-phase of anatase (A) and rutile (R), and mass fraction of rutile (XR) had been increased with adding Cr, especially under 973 K. The SEM images indicated that the needle-like oxide was formed at the temperature of 973 K. The photocatalytic activity is relatively higher at 973 K under both of ultraviolet (UV) and visible light (VL). At the same time, the influence on photocatalytic activity of the photocatalyst coatings under UV or VL by adding Cr would guide the direction for the improvement of photocatalytic activity.

Preparation and characterization of MCM-48/nickel oxide composite as an efficient and reusable catalyst for the assessment of photocatalytic activity

2020 ◽  
Vol 27 (26) ◽  
pp. 32670-32682
Author(s):  
Mohamed Shaban ◽  
Ahmed Hamd ◽  
Ragab R. Amin ◽  
Mostafa R. Abukhadra ◽  
Ahmed Abdel Khalek ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Nickel Oxide ◽  
Reusable Catalyst ◽  
Oxide Composite

Photocatalytic activity of TiO2/Ti composite coatings fabricated by mechanical coating technique and subsequent heat oxidation

2013 ◽  
Vol 16 (6) ◽  
pp. 1949-1956 ◽  
Author(s):  
Yun Lu ◽  
Kou Matsuzaka ◽  
Liang Hao ◽  
Yutaka Hirakawa ◽  
Hiroyuki Yoshida ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Composite Coatings ◽  
Coating Technique ◽  
Mechanical Coating

scholarly journals Impedance Spectroscopy of Lead-Free Ferroelectric Coatings

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 221
Author(s):  
Mariya Aleksandrova ◽  
Ivailo Pandiev
Keyword(s):  
Composite Coatings ◽  
Electrical Circuit ◽  
Ferroelectric Materials ◽  
Piezoelectric Transducers ◽  
Lead Free ◽  
Electrical Behavior ◽  
Oxide Composite ◽  
Before And After ◽  
Frequency Dependences ◽  
Good Agreement

This paper presents impedance measurements of ferroelectric structures involving lead-free oxide and polymer-oxide composite coatings for sensing and energy harvesting applications. Three different ferroelectric materials grown by conventional microfabrication technologies on solid or flexible substrates are investigated for their basic resonant characteristics. Equivalent electrical circuit models are applied to all cases to explain the electrical behavior of the structures, according to the materials type and thickness. The analytical results show good agreement with the experiments carried out on a basic types of excited thin-film piezoelectric transducers. Additionally, temperature and frequency dependences of the dielectric permittivity and losses are measured for the polymer-oxide composite device in relation with the surface morphology before and after introduction of the polymer to the functional film.

scholarly journals Photocatalytic Activity Enhancement of Low-pressure Cold-Sprayed TiO2 Coatings Induced by Long-term Water Vapor Exposure

2021 ◽  
Author(s):  
Seremak Wioletta ◽  
Baszczuk Agnieszka ◽  
Jasiorski Marek ◽  
Gibas Anna ◽  
Winnicki Marcin
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Water Vapor ◽  
Sol Gel ◽  
Low Pressure ◽  
Oxygen Depletion ◽  
Amorphous Structure ◽  
Industrial Applications ◽  
Additional Parameter

AbstractThis work shows that the titanium dioxide coatings obtained by low-pressure cold gas spraying with the use of the sol–gel amorphous TiO2 powder are characterized by photocatalytic activity despite their partial amorphous content. Moreover, the research outcome suggests that the decomposition rate of organic pollutants is enhanced after long-term exposure to moisture. The condensation humidity test is not detrimental to the continuity and integrity of the coating, but the phase composition of coatings changes—with the exposure to water vapor, the portion of the amorphous phase crystallizes into brookite. The mechanism responsible for the conversion of amorphous TiO2 into brookite is attributed to the water-driven dissolution and reprecipitation of TiO6 octahedra. It has been shown that an additional parameter necessary for the stabilization of the brookite is the oxygen depletion of the amorphous structure of titanium dioxide. Considering the results presented in this paper and the advantages of a portable, low-pressure cold spray system for industrial applications, it is expected that TiO2 coatings produced from a sol–gel feedstock powder can be further developed and tested as efficient photocatalysts.

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