Surface treatment of TiO2nanoparticles via sol–gel method: effect of silane type on hydrophobicity of the nanoparticles

Pazokifard, Shahla, Farrokhpay, Saeed, Mirabedini, Mojtaba and Esfandeh, Masoud (2015) Surface treatment of TiO2nanoparticles via sol–gel method: effect of silane type on hydrophobicity of the nanoparticles. Progress In Organic Coatings, 87 36-44. doi:10.1016/j.porgcoat.2015.04.021


Author Pazokifard, Shahla
Farrokhpay, Saeed
Mirabedini, Mojtaba
Esfandeh, Masoud
Title Surface treatment of TiO2nanoparticles via sol–gel method: effect of silane type on hydrophobicity of the nanoparticles
Journal name Progress In Organic Coatings   Check publisher's open access policy
ISSN 0300-9440
1873-331X
Publication date 2015-10
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.porgcoat.2015.04.021
Open Access Status Not yet assessed
Volume 87
Start page 36
End page 44
Total pages 36
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
Hydrophobic TiO2 nanoparticles are important elements in preparation of functional organic coatings. In fact, hydrophobicity of the nanoparticle helps to optimize the photoactivity of the coating while maintaining its durability. In this study, surface treatment of the commercial TiO2 nanoparticles was carried out using various silane precursors via sol–gel method in both acidic (pH 2) and alkaline media (pH 12). A long aliphatic chain (F1), a short aliphatic chain (F2), and an aromatic (F3) fluorosilane were used for this purpose. The treated nanoparticles were characterized using Fourier transform infrared and X-ray photoelectron spectroscopy, thermal gravimetric analysis, and transmission electron microscopy. Hydrophobicity of the treated nanoparticles was evaluated by floating in de-ionized water.

The results showed that the adsorption of F1 on TiO2 only takes place in the alkaline condition while F3 is adsorbed in both alkaline and acidic conditions. Furthermore, no significant adsorption for F2 was detected neither in alkaline nor acidic conditions. The floatation results revealed a hydrophobic nature for F1 and F3 treated nanoparticles, however, nanoparticles attempted with F2, remained hydrophilic. It was concluded that the hydrophobicity of the nanoparticles is affected by both chemical nature of fluorosilane as well as pH of the treatment media.
Keyword Sol–gel
TiO2 nanoparticles
Fluoroalkylsilane
Hydrophobicity
Dispersion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Official 2016 Collection
 
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Created: Wed, 03 Jun 2015, 09:00:54 EST by Dr Saeed Farrokhpay on behalf of Julius Kruttschnitt Mineral Research Centre