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Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: A Combination Coating of Rutile TiO<sub>2</sub> Nano Structures and Sol-Gel Films to Enhance Weathering Performance of Wood

Source: Paper 2 from Proceedings of the 13th Chinacoat Conference, Nov. 16-17, 2015, Shanghai, China. 11 p.

Author(s)Zheng, Rongbo; Tshabalala, Mandla A.; Du, Guanben

Publication Year: 2015  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4707-3B

Abstract: A convenient room temperature approach was developed for growing rutile TiO2 nanostructures on the wood surface by direct hydrolysis and crystallization of TiCl3 in saturated NaCl aqueous solution. The weathering performance of wood coated with a combination of rutile TiO2 nanostructures and a sol-gel deposit of alkoxysilanes was determined by exposing treated wood specimens to UV light and water spray. After exposure to 155-h UV irradiation, the wettability of WTHM changed from hydrophobic to hydrophilic. This indicated that the initial low-surface free-energy materials had undergone degradation due to the photocatalytic activity of TiO2. After 960-h UV light irradiation and water spray, SEM and EDX of WTHM showed that TiO2 nanostructures had partially peeled off the wood surface. This suggested that the adjacent wood surface also suffered degradation due to the photocatalytic activity of TiO2. Although TiO2/HDTMOS/MTMOS coating apparently increased the weight stability of the wood, it made a relatively small contribution to the color stability of wood during 960-h accelerated weathering process. This study has shown that in order to derive the greatest benefit from modification of wood surfaces with rutile TiO2 nanostructures for weathering resistance, it is necessary to take measures to inhibit the photocatalytic activity of TiO2.

Keywords: Coating; Hydrophobic; Nanostructure; Photocatalytic; Rutile; Titanium dioxide; Weathering; Wood

Publication Review Process: Non-Refereed (Other)

File size: 560 kb(s)

Date posted: 05/04/2016
RITS Product ID: 79104
Current FPL Scientist associated with this product
Tshabalala, Mandla A.
Research Chemist

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