Microstructure and electrical properties of plasma sprayed porous TiO2 coatings containing anatase

Wang, X.Y.; Liu, Z.; Liao, Hanlin; Klein, D.; Coddet, Christian

doi:10.1016/j.tsf.2003.10.151

Cited by 24 publications

(10 citation statements)

References 9 publications

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“…As can be seen, although the data exhibit significant scattering, the photocatalytic activity of the coatings for the MB conversion displayed some correlation with the anatase phase content. This is consistent with a substantial part of relevant publications [10,13,29]. Consequently, higher anatase phase content led to faster degradation of MB.…”

Section: Uv Irradiation Time (H) Mb Concentration (Ppm)supporting

confidence: 91%

“…The coatings displayed the typical microstructure of TiO 2 layers deposited from nanostructured or submicron-sized particle feedstock reported in the literature, according to which these coating microstructures basically comprise two clearly differentiated zones, yielding a bimodal structure [10,16,17,29]. One coating region, which was completely melted, consisted mainly of an amorphous titania matrix with recrystallised nanometre-sized grains of rutile.…”

Section: Coating Microstructure and Phase Distributionmentioning

confidence: 73%

“…The calculated anatase content in all coatings is plotted in Figure 8. The coatings obtained with helium exhibited a much higher anatase phase content, regardless of the feedstock used [6,29]. Regarding the influence of the starting powder, the two plots in Fig.…”

Section: Coating Microstructure and Phase Distributionmentioning

confidence: 93%

“…This figure (left) shows that the porosity of all coatings displayed the values typically found in APS coatings. In general, porosity increases when helium gas is used owing to the lower plasma heat input [6,16,29].…”

Section: Coating Microstructure and Phase Distributionmentioning

confidence: 99%

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Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

Bordes

Vicent

Moreno

et al. 2014

Ceramics International

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Cita bibliográfica / Cita bibliogràfica (ISO 690):BORDES, Mari Carmen, et al. Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying. Ceramics International, 2014, vol. 40, no 10, p. 16213-16225. AbstractAtmospheric plasma spraying (APS) has been proved useful in obtaining TiO 2 coatings with effective photocatalytic activity. However, the influence of feedstock characteristics on photocatalytic activity has hardly been addressed.This study was undertaken to prepare TiO 2 photocatalytic coatings by APS from different feedstocks. The feedstocks were obtained by spray drying suspensions of a nano-and a submicron-sized TiO 2 powder, with different solids contents and/or ratios of the nano-to submicron-sized particles. All the resulting powders were fully 2 characterised to assess their suitability for use in APS processes. Feedstock powders were then deposited on steel coupons by APS using hydrogen or helium as secondary plasma gas. Coating microstructure and phase composition were characterised. Coating photocatalytic activity was determined by measuring the degradation of methylene blue dye in an aqueous solution.Powder characterisation showed that all feedstocks met plasma spray operation requirements with regard to agglomerate size distribution and density, as well as to powder flowability. Optimum agglomerate density was obtained when a well-balanced mixture of nano-and submicron-sized particles was used.All coatings displayed a bimodal microstructure with partially melted agglomerates that retained the initial nano-or submicron-sized structure and composition (anatase phase) of the feedstock, surrounded by a fully melted matrix mainly formed by rutile. As expected, coating porosity as well as the amount of partially melted areas depended strongly on plasma spray conditions and on feedstock characteristics.With regard to photocatalytic activity, a reasonably good fit of a first-order kinetic model to the experimental data was found for all coatings. The kinetic constants obtained displayed higher values than those of a commercial sol-gel coating. The values of these constants were related to feedstock characteristics as well as to plasma spraying conditions on the basis of anatase content. The contribution of other factors to the resulting coating surface is also discussed.

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Section: Uv Irradiation Time (H) Mb Concentration (Ppm)supporting

confidence: 91%

Section: Coating Microstructure and Phase Distributionmentioning

confidence: 73%

Section: Coating Microstructure and Phase Distributionmentioning

confidence: 93%

Section: Coating Microstructure and Phase Distributionmentioning

confidence: 99%

See 2 more Smart Citations

Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

Bordes

Vicent

Moreno

et al. 2014

Ceramics International

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“…Plasma deposited titanium oxide coatings (TiO x ) are widely used and investigated in electrical and optical applications [1]. In addition, due to its biocompatibility and antimicrobial properties, it is an interesting material for implants [2].…”

Section: Introductionmentioning

confidence: 99%

Open air plasma deposited antimicrobial SiO_x/TiO_x composite films for biomedical applications

Rapp

Baumgärtel

Artmann

et al. 2016

Current Directions in Biomedical Engineering

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Open air atmospheric pressure plasma jet (APPJ) enhanced chemical vapour deposition process was used to deposit biocompatible SiO x /TiO x composite coatings. The as deposited films are hydrophilic and show visible light induced photocatalytic effect, which is a consequence of the formation of defects in the TiO x structure due to the plasma process. This photocatalytic effect was verified by the demonstration of an antimicrobial effect under visible light on E. coli as well as by degradation of Rhodamine B. The films are non-cytotoxic as shown by the cytocompatibility tests. The films are conductive to cell growth and are stable in DMEM and isopropanol. The structural evaluation using SEM, EDS and XPS shows a dispersion of TiO x phase in a SiO x CyHz matrix. These analyses were used to correlate the structure-property relationship of the composite coating.

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Acid‐induced bioactive titania surface

Zhao

Liu

Ding

2005

J Biomedical Materials Res

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Nano- and conventional-TiO(2) powders were deposited onto titanium alloy using atmospheric plasma spraying technology. As-sprayed titania coatings were treated by H(2)SO(4) and HCl solutions at room temperature for 24 h, and the bioactivity was evaluated by simulated body fluid tests. Measured X-ray diffraction patterns indicated that as-sprayed titania coatings obtained from both nano and conventional powders were composed of primary rutile as well as a small quantity of anatase and Ti(3)O(5). The surface of as-sprayed coatings prepared from the conventional powder was rougher than that from nanopowder. After immersion in simulated body fluid for 2 weeks, both acid-treated nano- and titania coatings have induced carbonate-containing hydroxyapatite to form on the surfaces. However, this phenomenon did not appear on the surface of as-sprayed nano- and conventional-titania coatings. The results obtained indicated that the bioactivity of plasma sprayed titania coatings was improved by the acid treatment and had nothing to do with phase composition and particle size of the original TiO(2) powders.

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Microstructure and electrical properties of plasma sprayed porous TiO2 coatings containing anatase

Cited by 24 publications

References 9 publications

Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

Open air plasma deposited antimicrobial SiO_x/TiO_x composite films for biomedical applications

Acid‐induced bioactive titania surface

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Microstructure and electrical properties of plasma sprayed porous TiO2 coatings containing anatase

Cited by 24 publications

References 9 publications

Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

Preparation of feedstocks from nano/submicron-sized TiO 2 particles to obtain photocatalytic coatings by atmospheric plasma spraying

Open air plasma deposited antimicrobial SiOx/TiOx composite films for biomedical applications

Acid‐induced bioactive titania surface

Contact Info

Product

Resources

About

Open air plasma deposited antimicrobial SiO_x/TiO_x composite films for biomedical applications