Developing hydrophobic and superhydrophobic TiO2 coatings by plasma spraying

Sharifi, Navid; Pugh, Martin; Moreau, Christian; Dolatabadi, Ali

doi:10.1016/j.surfcoat.2016.01.029

Cited by 77 publications

(33 citation statements)

References 30 publications

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“…Amongst the various surface roughness parameters, the arithmetic average surface roughness (Ra), root mean square surface roughness (Rq), skewness (Rsk) and kurtosis (Rku) were measured, and their possible relationships with the wettability of the laser-textured coating were investigated. Ra is the most commonly used surface roughness parameter; it is related to the water contact angle and thus surface repellence [15]. Rsk is a measure of the asymmetry of the surface profile.…”

Section: Morphology and Structural Characterisationmentioning

confidence: 99%

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Wettability Characteristics of Laser Surface Textured Plasma Sprayed TiO<sub>2</sub>/ZnO Coatings

et al. 2019

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Surface wettability behaviour is generally categorised as hydrophobic and hydrophilic depending on the contact angle value. Surface wettability has been attracting considerable attention in research due to its unique behaviour in the field of self-cleaning, anti-fouling and anti-corrosion. Surfaces with high and low wettabilities can be fabricated using various methods, including chemical etching, anodisation and laser surface texturing. The present study investigated the effects of textured surfaces via laser surface texturing on the wettability properties of TiO 2 /ZnO coatings. TiO 2 /ZnO coating was selected due to its high photocatalytic activity, non-toxicity and low cost, which are essential properties for self-cleaning and anti-fouling applications. Picosecond laser ablation was used to produce microdimple textures on the coating surfaces. The wettability of the laser-textured surfaces was greatly reduced, achieving superhydrophilic properties with contact angle of 1.4° ± 2.42° for laser-textured TiO 2 coating. On the other hand, coatings with ZnO compositions exhibited increased contact angles for both textured and non-textured surfaces. Moreover, no clear cut correlations between the surface roughness properties of non-textured and laser-textured TiO 2 /ZnO coatings and the surface wettability properties was observed. This finding provides new approaches in designing textured surface materials that can effectively increase the wettability properties for selfcleaning and anti-fouling applications.

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Section: Morphology and Structural Characterisationmentioning

confidence: 99%

“…Rku is a measure of the peakedness or flatness of a surface. Rsk and Rku have both been used to predict the water mobility on a surface [15,16]. For surface roughness measurements, three areas with size of 100 µm 2 on different parts of the samples were used.…”

Section: Morphology and Structural Characterisationmentioning

confidence: 99%

Wettability Characteristics of Laser Surface Textured Plasma Sprayed TiO<sub>2</sub>/ZnO Coatings

et al. 2019

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“…To make sure the surface of the samples were free of organic contamination from the acetone or isopropyl alcohol, the samples were placed in boiling deionized distilled water as proposed by Gentlemen et al [34]. In order to reduce the surface energy and also isolate and study the effect of surface roughness on the wetting behavior of the coatings, all samples were dipped into a 0.5 wt% solution of stearic acid in 1-propanol and then dried using compressed dry air [11]. A flat sample treated with stearic acid using the same method yields a contact angle of 97° and sliding does not occur on such surface.…”

Section: Surface Treatmentmentioning

confidence: 99%

“…Atmospheric plasma spray (APS) and suspension plasma spray (SPS) have both been largely used for thermal barrier coatings [5], abradable coatings [6] and erosion, corrosion and wear resistant applications [7][8][9] due to their versatility, deposition rate and scalability. Furthermore, in recent years, new applications have emerged using plasma spraying that are principally focused on generating textured coatings for applications such as superhydrophobic coatings [10,11] and electrochemically active electrodes [12,13]. Due to the novelty of such applications, there is lack of thorough experimental data and published research about them.…”

Section: Introductionmentioning

confidence: 99%

Engineering surface texture and hierarchical morphology of suspension plasma sprayed TiO 2 coatings to control wetting behavior and superhydrophobic properties

Sharifi

Ettouil

Moreau

et al. 2017

Surface and Coatings Technology

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Beyond its conventional application for developing thermal barrier coatings, suspension plasma spraying (SPS) has shown promise for new applications focusing on surface textured coatings including superhydrophobic coatings. Such coatings have a dual-scale hierarchical morphology or so-called -cauliflower‖ features on the surface and they demonstrate extreme water repellence and mobility after treatment for lowering their surface energy. Studying and determining suitable process parameters to optimize the wetting properties of these coatings is the focus of this work. Herein, it is demonstrated that by carefully designing and controlling the process parameters, one can generate relatively fine and uniform dual-scale (hierarchical) surface textured coatings that after treatment for lowering their surface energy, show significantly improved water repellence and water mobility with water contact angles as high as 170° and sliding angles as low as 1.3°. It is also demonstrated that both scale levels of surface textures (i.e. micron-scale and nanoscale) are essential for having simultaneously improved water repellence and mobility. Furthermore, it is established that producing finer, more uniformly distributed and packed surface features lead to more consistent and desirable wetting properties. The results show the significant influence of pre-deposition surface * Corresponding author (martin.pugh@concordia.ca) ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T 2 roughness, precursor suspension rheology and plasma power on the structure and performance of the developed coatings.

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“…They have recently received great attention for the biomedical applications owing to their more stable chemical composition [11,12]. TiO 2 were fabricated on cp-Ti by various surface coating methods including sol-gel [13], anodic oxidation [14], magnetron sputtering [15], electrophoretic deposition [16], acid etching [17,18], laser surface treatment [19], plasma spraying [20,21] and micro arc oxidation [22][23][24][25] etc. However, certain problems like non-homogenous structure, micro-structural control problems, micro-cracks formation, the presence of phase impurity, poor adhesion strength were observed in these methods except for MAO technique [26][27][28].…”

mentioning

confidence: 99%

Characterization, Bioactivity and Antibacterial Properties of Copper-Based TiO2 Bioceramic Coatings Fabricated on Titanium

Durdu

2018

Coatings

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The bioactive and anti-bacterial Cu-based bioceramic TiO 2 coatings have been fabricated on cp-Ti (Grade 2) by two-steps. These two-steps combine micro-arc oxidation (MAO) and physical vapor deposition-thermal evaporation (PVD-TE) techniques for dental implant applications. As a first step, all surfaces of cp-Ti substrate were coated by MAO technique in an alkaline electrolyte, consisting of Na 3 PO 4 and KOH in de-ionized water. Then, as a second step, a copper (Cu) nano-layer with 5 nm thickness was deposited on the MAO by PVD-TE technique. Phase structure, morphology, elemental amounts, thickness, roughness and wettability of the MAO and Cu-based MAO coating surfaces were characterized by XRD (powder-and TF-XRD), SEM, EDS, eddy current device, surface profilometer and contact angle goniometer, respectively. The powder-and TF-XRD spectral analyses showed that Ti, TiO 2 , anatase-TiO 2 and rutile-TiO 2 existed on the MAO and Cu-based MAO coatings' surfaces. All coatings' surfaces were porous and rough, owing to the presence of micro sparks through MAO. Furthermore, the surface morphology of Cu-based MAO was not changed. Also, the Cu-based MAO coating has more hydrophilic properties than the MAO coating. In vitro bioactivity and in vitro antibacterial properties of the coatings have been investigated by immersion in simulated body fluid (SBF) at 36.5 • C for 28 days and bacterial adhesion for gram-positive (S. aureus) and gram-negative (E. coli) bacteria, respectively. The apatite layer was formed on the MAO and Cu-based MAO surfaces at post-immersion in SBF and therefore, the bioactivity of Cu-based MAO surface was increased to the MAO surface. Also, for S. aureus and E. coli, the antibacterial properties of Cu-based MAO coatings were significantly improved compared to one of the uncoated MAO surfaces. These results suggested that Cu-based MAO coatings on cp-Ti could be a promising candidate for biomedical dental implant applications.TiO 2 -based coatings have been suggested to improve corrosion resistance, bioactivity and biocompatibility of implant surfaces. They have recently received great attention for the biomedical applications owing to their more stable chemical composition [11,12]. TiO 2 were fabricated on cp-Ti by various surface coating methods including sol-gel [13], anodic oxidation [14], magnetron sputtering [15], electrophoretic deposition [16], acid etching [17,18], laser surface treatment [19], plasma spraying [20,21] and micro arc oxidation [22][23][24][25] etc. However, certain problems like non-homogenous structure, micro-structural control problems, micro-cracks formation, the presence of phase impurity, poor adhesion strength were observed in these methods except for MAO technique [26][27][28]. Thus, implant application areas of the coatings produced by these techniques are limited.Micro-arc oxidation (MAO) is one of the most applicable methods to deposit a porous and rough bioceramic layer on valve metals such as Ti, Al, Mg, and Zr surfaces [3,[29][30][31]. The MAO coating promotes bioacti...

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Developing hydrophobic and superhydrophobic TiO2 coatings by plasma spraying

Cited by 77 publications

References 30 publications

Wettability Characteristics of Laser Surface Textured Plasma Sprayed TiO<sub>2</sub>/ZnO Coatings

Wettability Characteristics of Laser Surface Textured Plasma Sprayed TiO<sub>2</sub>/ZnO Coatings

Engineering surface texture and hierarchical morphology of suspension plasma sprayed TiO 2 coatings to control wetting behavior and superhydrophobic properties

Characterization, Bioactivity and Antibacterial Properties of Copper-Based TiO2 Bioceramic Coatings Fabricated on Titanium

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