Effect of relative humidity and variation of particle number size distribution on the inactivation effectiveness of airborne silver nanoparticles against bacteria bioaerosols deposited on a filter

Characterization of particulate matter concentrations and bioaerosol on each floor at a building in Seoul, Korea

“…1 Average concentrations of particulate matter on the first, second, fifth, and eighth floors in building during summer and winter seasons clearly indicate that indoor particles can reach a very serious level in the winter in buildings with an inadequate HVAC system. It was previously found that a high level of PM 10 in a school near to a traffic area might have originated from vehicle exhaust emissions (Kim et al 2013;Lee et al 2010). In winter, very frequent and persistent thermal inversions and fog situations at ground level cause a considerable amount of air pollutions to accumulated in the lower layers of the atmosphere (Vecchi et al 2007).…”

Bacterial Bioaerosol Concentrations in Public Restroom Environments

“…The sampling flow rate was 100 liters per minute, and the sampling time was between two to five minutes per sample, depending on the bioaerosol concentration, with at least three replicates performed for all monitoring conditions. We used nutrient agar (beef extract 0.3%, peptone 0.5%, and agar 1.5%; Difco; 20 mL agar) plates (Hwang et al, 2010;Lee et al, 2010) in the Bioculture to sample and enumerate the total airborne bacterial bioaerosols. The sampled bacterial bioaerosols were incubated at 37°C for 24 hours, the number of colonies was enumerated and the concentration of culturable bioaerosols in the air environment was calculated and expressed in units of CFU/m 3 .…”

“…The measurements in very large scale public restrooms (although these are rare) and at various time points over one day will be future research topics. Although reasonable experimental conditions for incubation were chosen as confirmed in our previous investigations (Hwang et al, 2010;Lee et al, 2010), the types of bio-samplers, agars, and incubation conditions may affect the bioaerosols concentration data, which are also other possible parameters requiring further research.…”

Antimicrobial nanoparticle-coated electrostatic air filter with high filtration efficiency and low pressure drop

“…Various techniques have been investigated to impart antimicrobial activity on filter media. Filter coating techniques, using an antimicrobial material such as silver (Ag) and copper (Cu) nanoparticles, carbon nanotubes (CNT), and biocidal chemicals are considered to be promising methods for imparting antimicrobial ability with relatively little cost (Ji et al, 2007;Lee et al, 2010). Recently, extracts of natural products with antimicrobial activity have been considered as novel, efficient, and cost-effective materials for the development of antimicrobial filter media (Dixon, 2001).…”