Fluoroalkylsilane treatment of TiO2 nanoparticles in difference pH values: Characterization and mechanism

Pazokifard, S., Mirabedini, S.M., Esfandeh, M. and Farrokhpay, S. (2012) Fluoroalkylsilane treatment of TiO2 nanoparticles in difference pH values: Characterization and mechanism. Advanced Powder Technology, 23 4: 428-436. doi:10.1016/j.apt.2012.02.006


Author Pazokifard, S.
Mirabedini, S.M.
Esfandeh, M.
Farrokhpay, S.
Title Fluoroalkylsilane treatment of TiO2 nanoparticles in difference pH values: Characterization and mechanism
Formatted title
Fluoroalkylsilane treatment of TiO2 nanoparticles in difference pH values: Characterization and mechanism
Journal name Advanced Powder Technology   Check publisher's open access policy
ISSN 0921-8831
1568-5527
Publication date 2012-07
Sub-type Article (original research)
DOI 10.1016/j.apt.2012.02.006
Volume 23
Issue 4
Start page 428
End page 436
Total pages 9
Editor G. V. Franks
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
In this research, TiO2 nanoparticles were treated with hydrophobic 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (fluorosilane) in acidic, neutral and alkaline conditions. The treated nanoparticles were characterized using FTIR spectroscopy, thermal gravimetric analysis, X-ray photoelectron spectroscopy, transmission electron microscopy and X-ray diffraction spectroscopy. Reflectance spectra were obtained using UV–vis diffuse reflectance spectroscopy and band gap energy of the various nanoparticles was determined. Zeta potential measurements were used to evaluate colloidal stability of nanoparticles in aqueous media. The mechanism of fluorosilane adsorption on the surface of TiO2 nanoparticles was investigated using ATR-FTIR spectroscopy and turbidimetric technique.

The characterization results revealed that the amorphous fluorosilane adsorbs on the surface of TiO2 nanoparticles in both neutral (pH 6) and alkaline (pH 11) solutions. The values of the band gap energy for all treated nanoparticles were almost the same, in the range of 3.10–3.18 eV. Zeta potential measurements showed that isoelectric point of the TiO2 nanoparticles shifts from 6.8 for untreated TiO2 to 4.4 for treated one. Based on the zeta potential measurement results, it is expected that treated TiO2 nanoparticles in neutral or alkaline conditions have higher colloidal stability and better dispersion in the aqueous solutions. Hydrophobic character of fluoro specious on the surface of nanoparticles leads the treated nanoparticles migrate towards the suspension surface. Therefore, these treated nanoparticles may be useful for developing self-cleaning coatings with minimal destructive effect on the polymeric matrix.
Keyword TiO2 nanoparticles
Fluoroalkylsilane
Surface treatment
Colloidal stability
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Special Issue Featuring Articles from Chemeca2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Official 2013 Collection
 
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Created: Thu, 02 Aug 2012, 11:45:58 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre