The effects of ozone treatment and extraction on fungal activities of bamboo and red-oak flooring materials have been investigated. One set of wood samples was extracted with cyclohexane and ethanol for 48 hours to remove extractable compounds. Another set of materials was exposed to ozone (2000 ppbv ± 63 ppbv) for five days. Solvent-extracted and ozone-treated samples were incubated in closed chambers at 85 % ± 2 % RH and 30 oC ± 1 oC. They were removed at regular intervals for fungal growth evaluation. Ozone treatment caused slight changes in chemical components of these two woods. For example, degradation of lignin components was observed as the decrease in IR bands in a region of 1450 cm-1 to 1610 cm-1. Also, ozone-treated and control bamboo samples were slightly covered with mold after ten weeks of exposure to the humid environment, while no visual fungal growth is reported on extracted samples until two weeks after, probably because the extraction removed some components that limit fungal growth. Oak samples showed no evidence of mold growth during the same exposure period, suggesting that oak contains some inhibitory components to fungi.
Proceedings Title: The 12th International Conference on Indoor Air Quality and Climate- International Society of Indoor Air Quality and Climate
Conference Dates: June 5-10, 2011
Conference Location: Austin, TX
Conference Title: Indoor Air 2011
Pub Type: Conferences
Fungi, Extractives, Ozone, Bamboo, Oak