Construction of hydrophobic wood surfaces by room temperature deposition of rutile (TiO₂) nanostructures

Abstract

A convenient room temperature approach was developed for growing rutile TiO₂ hierarchical structures on the wood surface by direct hydrolysis and crystallization of TiCl₃ in saturated NaCl aqueous solution.The morphology and the crystal structure of TiO₂ coated on the wood surface were characterized byscanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The TiO₂ morphology onthe wood surface could be tuned by simply changing either the reaction time or pH value of the reaction mixture. After modification with perfluorodecyltriethoxysilane (PFDTS), the water contact angle (WCA) of the TiO₂-treated wood (T1) surface increased to 140.0 ± 4.2◦, which indicated a highly hydrophobicwood surface. In addition, compared with untreated control wood, PFDTS-TiO₂ treatment (PFDTS-T1-treated) not only reduced liquid water uptake, but also delayed the onset of water saturation point of the wood substrate. The weight change of PFDTS-T1-treated wood after 24 h of water immersion was 19.3%,compared to 81.3% for the untreated control wood. After 867 h of water immersion, the weight change for the treated and untreated wood specimens was 117.1%, and 155.1%, respectively. The untreated control wood reached the steady state after 187 h, while the PFDTS-T1-treated wood did not reach the steady state until after 600 h of immersion.

Citation

Zheng, Rongbo; Tshabalala, Mandla A.; Li, Qingyu; Wang, Hongyan. 2015. Construction of hydrophobic wood surfaces by room temperature deposition of rutile (TiO₂) nanostructures. Applied Surface Science. 328: 453-458. https://doi.org/10.1016/j.apsusc.2014.12.083