Adventures In the Nano Zone! That is the title of the internet presentation that scientists from the Center for Sustainable Nanotechnology gave last Friday to 8th graders at the Hewitt School, an all-girls school in New York City. That was followed by lively Q&A sessions. During this week, Hewitt School students will be asking Center scientists more questions via comments at the end of this blog post, so stay tuned!Hewitt School teacher, Kristina Walter, had a section on nanotechnology planned for her students and also happened to see a link on Facebook to one of our blog posts. Together, we came up with a little experiment. Last Friday’s “webinar” was an introduction to nanotechnology and the goals of our research center. As the students come up with projects related to nanotechnology, they will get some help from Center scientists via a Q&A in the comments section of this blog post. In another post, we will publish a sampling of some of the student projects. We’re happy we could help out and are super excited to see what the students come up with!

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Removal of Indoor Airborne Bacteria by Nano-Ag/TiO2 as Photocatalyst: Feasibility Study in Museum and Nursing Institutionsand , 51Department of Landscape Architecture, National Chin-Yi Univ. of Technology, Taichung, Taiwan; Integrated Research Center for Green Living Technologies, National Chin-Yi Univ. of Technology, Taichung, Taiwan. .2Integrated Research Center for Green Living Technologies, National Chin-Yi Univ. of Technology, Taichung, Taiwan; oreck air purifier cannabisDepartment of Landscape Architecture, National Chin-Yi Univ. of Technology, Taichung, Taiwan.3Department of Medicine, Taichung Veteran General Hospital, Chung-Shan Medical Univ., Taichung, Taiwan.4Rong Sheng Engineering Design Co., Ltd. and Rong Chin Engineering Consultants, Taichung, Taiwan.5U.S. holmes carbon air purifierEnvironmental Protection Agency, Kansas City, KS.holmes general purpose air purifier

Abstract: Deterioration of indoor air quality attributable to airborne bacterial consortia is a widespread environmental problem. The main objective of this study is to evaluate the feasibility of applying the syngetic effect of nano-Ag/TiO2 as a photocatalyst and UV light to enhance the disinfecting capability of full-scale bacterial restraining equipment on-site in the National Museum of Natural Science and a medical-nursing institute. The influence of initial counts of total airborne bacteria and volume of space on the efficiency of bacterial restraining have been studied. In the case of museum application, a higher initial total bacterial count leads to better bacterial restraining rates; Site A (initial total bacterial counts = 506  CFU/m3) has the best bacterial restraining rate (92%) as compared with Site B (69%, initial total bacterial counts = 158  CFU/m3) and Site C (80%, initial total bacterial counts = 338  CFU/m3) after 24 h of operation. Higher initial counts of total airborne bacteria lead to an increasing bacterial restraining rate.

Approximately 92% (Site A) and 74% of restrained bacterial rate were observed in a museum and nursing institutions, respectively, under the similar initial total airborne bacterial counts (506, 598  CFU/m3). The results illustrate that changes in the volume of space do not have significant inhibitory effects on the efficiency. The proposed equipment can disinfect air to restrain bacteria effectively, as demonstrated on-site in museums and nursing institutions; the results will be valuable references for designing a full-scale commercialized device for large-scale applications in the future.ASCE Subject Headings: Indoor air quality, Air quality, Control systems, BacteriaAuthor keywords: Nano-Ag/TiO2, Indoor air quality, Photocatalyst, Air quality control equipmentCited byPham, T.Lee, B. (2014). "Effects of Ag doping on the photocatalytic disinfection of E. coli in bioaerosol by Ag–TiO2/GF under visible light." , 10.1016/j.jcis.2014.04.030, 24-31. Online publication date: 1-Aug-2014.