Airflow resistance and bio-filtering performance of carbon nanotube filters and current facepiece respirators

Zou, Zhuanglei; Yao, Maosheng

doi:10.1016/j.jaerosci.2014.10.003

Cited by 28 publications

(29 citation statements)

References 52 publications

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“…Thus, in many different scenarios, including medical operations such as dental procedures and surgeries, healthcare providers wear protective masks to protect either themselves or safeguard the surgery from infection. In our previous work, we have shown that filter materials from N95, Surgical mask and "Doctor mask" had more than 95% filtration efficiency for 1.5 µm size particles, and close to 100% for 3 µm ones (Zou and Yao, 2015). Overall, N95 had a higher filtration efficiency, followed by Surgical mask and "Doctor mask" (Zou and Yao, 2015).…”

Section: Bioaerosol Shielding Efficiencies Of "Doctor Masks" and N95 mentioning

confidence: 91%

“…In our previous work, we have shown that filter materials from N95, Surgical mask and "Doctor mask" had more than 95% filtration efficiency for 1.5 µm size particles, and close to 100% for 3 µm ones (Zou and Yao, 2015). Overall, N95 had a higher filtration efficiency, followed by Surgical mask and "Doctor mask" (Zou and Yao, 2015). Here, we selected two common respirators: N95 and "Doctor masks" for which results are shown in Fig.…”

Section: Bioaerosol Shielding Efficiencies Of "Doctor Masks" and N95 mentioning

confidence: 99%

“…Therefore, wearing a respirator, especially during an outbreak, can help protect the wearer from pathogenic aerosol exposure. However, growing evidence shows that currently available respirator masks often fail to offer the desired protection (Loeb et al, 2009;Zou and Yao, 2015). This is largely due to leakage between the mask and human face, i.e., the problem of poor facial fit.…”

Section: Bioaerosol Concentration Monitoring In a Classroom Before Dmentioning

confidence: 99%

“…For example, "Doctor masks" or Surgical masks are usually used to prevent release of exhaled bioaerosols into the environment, while N95 respirators are generally used to prevent people from inhaling infectious aerosol particles in the environment. Current tests with different masks available on the market show that the filtration efficiencies of different masks vary greatly and the filtration efficiencies of N95 respirators and "Doctor masks" can generally reach above 90%, but for ultrafine particles their efficiencies decrease substantially (Balazy et al, 2006;Viscusi et al, 2009;Maclntyre et al, 2014;Zou and Yao, 2015). Particularly, N95 respirators may not achieve the expected filtration efficiency against bacteria and viruses ( Lee et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Fluorescent Bioaerosol Particles Resulting from Human Occupancy with and Without Respirators

Yao

2017

Aerosol Air Qual. Res.

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Airborne transmission of pathogenic aerosols via human breath plays a major role in infectious disease outbreaks in indoor environments. Yet, their bioaerosol emission profiles are still not well quantified. Here, we first studied bioaerosol emission rates of human exhaled breath from 12 healthy subjects, and then evaluated the bioaerosol emissions when wearing two different respirators "Doctor masks" and N95 in a controlled environment (27 m 3 ) using a bioaerosol sensorultraviolet aerodynamic particle spectrometer (UV-APS). The human bioaerosol contribution was further confirmed through classroom observation. The results showed that there was a peak around 1.5 µm for the fluorescent particles emitted from humans' breath. For the controlled environment, the presence of 5 people without wearing masks increased bioaerosol concentration by 107% within 30 min at an average emission rate of 8. resulting from the occupancy. When wearing N95 masks or "Doctor masks", bioaerosol increases were observed to be 81% or 31% for the controlled environment, respectively, lower compared to those without masks. In-classroom observation also showed a fluorescent particle concentration increase of about 50%. In all experiments, we observed a decline in PM number concentration. Bioaerosol emission from exhaled breath was calculated to account for about 17% of the increase in the controlled environment. The results here suggest the need for re-evaluating microbial aerosol exposure risks for medical sites that demand high levels of hygiene even while wearing a respirator.

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Section: Bioaerosol Shielding Efficiencies Of "Doctor Masks" and N95 mentioning

confidence: 91%

Section: Bioaerosol Shielding Efficiencies Of "Doctor Masks" and N95 mentioning

confidence: 99%

Section: Bioaerosol Concentration Monitoring In a Classroom Before Dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluorescent Bioaerosol Particles Resulting from Human Occupancy with and Without Respirators

Yao

2017

Aerosol Air Qual. Res.

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“…With regard to the filtration mechanism, the particle phase air pollutants, from particular to very fine particles (e.g., nanoparticle), can be captured by electrostatic mechanism of N95 respirator (Samy et al, 2009). Zou and Yao (2015) stated that the respirator masks could achieve a practical protection efficiency higher than 90%, while N95 types could obtain more than 99% absolute protection efficiency under fully sealed conditions. With regard to the odor exposure elimination, a respirator filled with activated carbon could effectively remove noxious gases and vapors from a contaminated air stream, as verified by Harry and Francisco (2006).…”

Section: Efficiency Test For Protection Against Exposure To Odorous Ementioning

confidence: 99%

Characterization and Exposure Assessment of Odor Emissions from Laser Cutting of Plastics in the Optical Film Industry

Chan

Yuan

Sun

et al. 2016

Aerosol Air Qual. Res.

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The introduction of lasers as a cutting tool has become an important step in achieving further cost reductions in the multi-functional optical film industry. However, the fumes produced during laser cutting causes an annoying and often unbearable odor in the working environment. To date, little research has been reported in terms of the worker exposure assessment and odorous substances generated in the process of cutting plastics with lasers. This study firstly investigated the worker exposure assessment and the protection efficiency of the carbonyls and phenols when a laser is used to cut polycarbonate (PC) and polyethylene terephthalate (PET), the primary base materials used in optical film industry. Results indicate that the concentrations of these substances increased with the power of the laser. Due to differences in the monomer structures of these materials, a 240 W laser produced a high concentration of phenols (1.56 mg m . However, the result of the masks studies could only reduce concentrations to between 1.88 mg m -3 and 2.2 mg m -3 , which barely meet the related regulatory standards. In contrast, the installation of local ventilation alone can effectively remove as much as 99% of the gaseous substances produced in the laser cutting of plastics.

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Application of Nanotechnology in Detection and Prevention of COVID-19

Kushwaha

Kalita

Bhardwaj

et al. 2020

Integrated Risk of Pandemic: Covid-19 Impacts, Resilience and Recommendations

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Airflow resistance and bio-filtering performance of carbon nanotube filters and current facepiece respirators

Cited by 28 publications

References 52 publications

Fluorescent Bioaerosol Particles Resulting from Human Occupancy with and Without Respirators

Fluorescent Bioaerosol Particles Resulting from Human Occupancy with and Without Respirators

Characterization and Exposure Assessment of Odor Emissions from Laser Cutting of Plastics in the Optical Film Industry

Application of Nanotechnology in Detection and Prevention of COVID-19

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