Ultra-Clean Air Ionizers for Suppression of Particulate Surface Contamination

1991 ◽  
pp. 249-256
Author(s):  
Philip C. D. Hobbs ◽  
J. Samuel Batchelder ◽  
Vaughn P. Gross ◽  
Kenneth D. Murray
Keyword(s):  
Surface Contamination ◽  
Clean Air ◽  
Particulate Surface

Electrostatic Removal of Loose Particulate Surface Contamination from Historical Photographs / Elektrostatische Abnahme lose aufliegender partikulärer Verunreinigungen von historischen Photographien / Dissolution électrostatique des particules libres contaminant la surface de photographies historiques

2013 ◽  
Vol 34 (3) ◽  
Author(s):  
Marie-Louise Frank ◽  
Ernst Becker ◽  
Julia Schultz ◽  
Ulrike Hähner ◽  
Irene Brückle ◽  
...  
Keyword(s):  
Light Microscopy ◽  
Microbial Contamination ◽  
Surface Contamination ◽  
Visual Evaluation ◽  
Microbiological Methods ◽  
Microbial Contaminants ◽  
Characteristic Features ◽  
Cleaning Technology ◽  
Historical Photographs ◽  
Particulate Surface

AbstractThis article discusses the use of electrostatic cleaning technology to remove loose particulate surface contamination - which here includes microbial contaminants such as spores, conidia and hyphal fragments - from two 19th century albumen photographs mounted on cardboard. The results of this study, obtained using light microscopy, SEM/EDX and microbiological methods, as well as conservators' visual evaluation, show that the technology is fundamentally suitable for removing microbial contamination from photographic prints and their cardboard mounts. Cleaning the surface four times with electrostatically charged foils reduced the microbial contamination by up to 70%. The surface of the albumen print, which is sensitive to abrasion, was not harmed, and its characteristic features were not changed. The photographs, which were partly delaminated from the cardboard support and the mechanically weakened cardboard, could be treated without creating any additional damage.

scholarly journals The Efficacy of Plant-Based Ionizers in Removing Aerosol for COVID-19 Mitigation

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11 ◽  
Author(s):  
Ady Suwardi ◽  
Chin Chun Ooi ◽  
Dan Daniel ◽  
Chee Kiang Ivan Tan ◽  
Hongying Li ◽  
...  
Keyword(s):  
Removal Rate ◽  
Surface Contamination ◽  
Ion Concentration ◽  
Delivery Rate ◽  
Equivalent Unit ◽  
Hygiene Measures ◽  
Long Time ◽  
Clean Air

Small-sized droplets/aerosol transmission is one of the factors responsible for the spread of COVID-19, in addition to large droplets and surface contamination (fomites). While large droplets and surface contamination can be relatively easier to deal with (i.e., using mask and proper hygiene measures), aerosol presents a different challenge due to their ability to remain airborne for a long time. This calls for mitigation solutions that can rapidly eliminate the airborne aerosol. Pre-COVID-19, air ionizers have been touted as effective tools to eliminate small particulates. In this work, we sought to evaluate the efficacy of a novel plant-based ionizer in eliminating aerosol. It was found that factors such as the ion concentration, humidity, and ventilation can drastically affect the efficacy of aerosol removal. The aerosol removal rate was quantified in terms of ACH (air changes per hour) and CADR- (clean air delivery rate-) equivalent unit, with ACH as high as 12 and CADR as high as 141 ft3/minute being achieved by a plant-based ionizer in a small isolated room. This work provides an important and timely guidance on the effective deployment of ionizers in minimizing the risk of COVID-19 spread via airborne aerosol, especially in a poorly-ventilated environment.

Surface brightening in eastern and central China since the implementation of the Clean Air Action in 2013: causes and implications

2020 ◽  
Author(s):  
Hongrong Shi ◽  
Jinqiang Zhang ◽  
Bin Zhao ◽  
Xiangao Xia ◽  
Bo Hu ◽  
...  
Keyword(s):  
Central China ◽  
Clean Air

383. Field Evaluation of a Libs Sampler for Determining Surface Contamination Due to Beryllium

2002 ◽  
Author(s):  
M. Hoover ◽  
M. McCawley ◽  
D. Yereb ◽  
S. Tinkle ◽  
S. Beaton ◽  
...  
Keyword(s):  
Field Evaluation ◽  
Surface Contamination
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