Surface treatment of TiO2 nanoparticles via sol–gel method: Effect of silane type on hydrophobicity of the nanoparticles

Pazokifard, Shahla; Farrokhpay, Saeed; Mirabedini, S.M.; Esfandeh, Masoud

doi:10.1016/j.porgcoat.2015.04.021

Cited by 28 publications

(9 citation statements)

References 45 publications

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“…A broad O 1s signal at 531.70 eV also confirms the presence of surface oxide, mostly ZnO for the DX56 substrate. Figure shows that, after Ti(OiPr) 4 treatment, Ti 2p 1/2 and Ti 2p 3/2 peaks are observed at 458.0 and 463.7 eV in agreement with previous studies . The O 1s signal also splits into two peaks at 531.2 and 529.5 eV for ZnO and the newly formed TiO 2 …”

Section: Resultssupporting

confidence: 91%

“…Figure 3 shows that, after Ti(OiPr) 4 treatment, Ti 2p 1/2 and Ti 2p 3/2 peaks are observed at 458.0 and 463.7 eV in agreement with previous studies. [29][30][31] The O 1s signal also splits into two peaks at 531.2 and 529.5 eV for ZnO and the newly formed TiO 2 . 32 TiO 2 -coated DX56 treated with C8 shows an intense F 1s photoelectron peak at 689.9 eV (S14) confirming the presence of fluorine on the surface.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

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Studies of inherent lubricity coatings for low surface roughness galvanised steel for automotive applications

Hill

Holliman

McGettrick

et al. 2017

Lubrication Science

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Surface lubricity on TiO2‐coated galvanised steels can be controlled by solution depositing perfluorooctanoic (C8), lauric (C12) or stearic (C18) acids to avoid lubricating oils/emulsions or substrate pre‐etching to remove surface oxide that add cost and waste. Water contact angles reveal increased surface hydrophobicity on coated samples that correlate with linear friction testing, suggesting water contact angle can be used to screen lubricity compounds. Linear friction testing shows that C12 and C18 lower the coefficient of friction (μ) by 50–60% compared with uncoated substrates whilst C8 drops μ from 0.31 to 0.22. Surfaces have been characterised by X‐ray photoelectron spectroscopy, scanning electron microscopy and atomic force microscopy, whilst infrared confirms that as‐deposited coatings contain physisorbed and deprotonated acids chemisorbed through esters and thermal gravimetric analysis confirms increasing loadings from C8 to C12 to C18. Surface washing removes physisorbed material and lowers μ by increasing surface organisation and alkyl chain packing that enhances frictional energy dissipation through steric quenching. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 91%

Section: Scanning Electron Microscopymentioning

confidence: 99%

Studies of inherent lubricity coatings for low surface roughness galvanised steel for automotive applications

Hill

Holliman

McGettrick

et al. 2017

Lubrication Science

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“…Titanium dioxide nanoparticles represent a promising alternative regarding contaminated wastewater treatment, thanks to their excellent photocatalytic activity and large surface area [3][4][5]. However, the separation of the nanoparticles from the aqueous solution once the process has finished represents a major drawback for their application.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Herrera

Reyes

Colina–Márquez

2016

J. Phys.: Conf. Ser.

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Abstract. Photocatalytic activity of iron oxide (IO) nanoparticles functionalized with TiO 2 was evaluated through photodegradation of phenol under UV irradiation. For this, magnetic nanoparticles were synthesized by co-precipitation method obtaining aggregates with a size of 46nm. The IO nanoparticles were encapsulated in a polysiloxane matrix and then functionalized with TiO 2 at 25°C (sample A: 0.1g TiO 2 and B: 0.3g TiO 2 ). Photodegradation experiments were carried out for six hours at pH 3.0 using concentrations of IO-TiO 2 nanoparticles of 0.2, 0.5, and 1.0g/L. A maximum amount of 89% of phenol photodegradation was achieved by using 0.2g/L of the IO-TiO 2 -B sample. In addition, it was evaluated the possibility to re-using the nanomaterial after magnetic separation. For this, 0.2g/L of B sample were submitted for five cycles of photodegradation. A stable photocatalytic activity was observed as well as the nanoparticles were regenerated by calcination among cycles, which suggests the versatility of these nanoparticles for the photodegradation of organic pollutants.

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“…Naturally occurring silica is crystalline and exists as sand, glass, quartz, etc., whereas synthetic silica is amorphous. Most nanoparticles synthesis techniques, such as physical vapor deposition, precipitation and sol-gel methods are expensive and complex and offer only limited control over particle size and size uniformity [10][11][12][13][14]. Silica nanoparticles are often produced using chemical methods such as sol-gel and deposition [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A novel and facile method for silica nanoparticles synthesis from high temperature vulcanization (HTV) silicon

Senemar¹,

Maleki²,

Niroumand³

et al. 2016

Metall Mater Eng

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This study is introducing a facile and novel method for synthesis of amorphous silica nanoparticles. Silica nanoparticles were synthesized by pyrolysis and combustion of high temperature vulcanization (HTV) silicone at 700 oC for 1 h. The products were investigated employing transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), dynamic light scattering (DLS), X-ray diffraction (XRD), Brunauer Emmett and Teller (BET) test and Fourier Transform Infrared (FTIR) Spectroscopy. The results indicated that the method is capable of synthesis of amorphous silica nanoparticles with sizes of mostly between 10 and 50 nm.

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Surface treatment of TiO2 nanoparticles via sol–gel method: Effect of silane type on hydrophobicity of the nanoparticles

Cited by 28 publications

References 45 publications

Studies of inherent lubricity coatings for low surface roughness galvanised steel for automotive applications

Studies of inherent lubricity coatings for low surface roughness galvanised steel for automotive applications

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

A novel and facile method for silica nanoparticles synthesis from high temperature vulcanization (HTV) silicon

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