Feasibility test of cellulose filter for collection of sulfuric acid mists

Chien, Chih-Hsiang; Zhou, Chufan; Wei, Hsin-Chieh; Sing, Simon Yang; Theodore, Alexandros; Wu, Chang‐Yu; Hsu, Yu-Mei; Birky, Brian K.

doi:10.1016/j.seppur.2017.12.028

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…The basic principle of this calculation is the number of infectious viruses carried per particle is equal to the number of infectious viruses in the droplet before evaporation, which could be determined by multiplying the virus concentration in the Collison Nebulizer with the volume of the aerosolized droplet (Walls et al 2016). The count median diameter of the droplets was 3 μm as measured by APS, which agrees with another study from our lab (Chien et al 2018). Assuming there was no deactivation of MS2 during the nebulization process, the theoretical vs. measured MS2 concentrations per particle are shown in Figure 5.…”

Section: Survivability Of Ms2supporting

confidence: 85%

Determination of the distribution of infectious viruses in aerosol particles using water-based condensational growth technology and a bacteriophage MS2 model

Pan

Carol

Lednicky

et al. 2019

Aerosol Science and Technology

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Inhalation of aerosols containing pathogenic viruses can result in morbidity, in some cases leading to mortality. The objective of this study was to develop a model for assessing how infectious viruses might distribute in airborne particles using bacteriophage MS2 as a surrogate for human viruses. Particle deposition in the respiratory system is size-dependent, and small virus-containing particles can be inhaled deeply into the lower lungs, potentially leading to more severe respiratory disease manifestations. Laboratory-generated virus-containing particles were size-selected by a differential mobility analyzer and then collected by the newly introduced Super-Efficient Sampler for Influenza Virus. The number of infectious and total viruses per particle as a function of particle size varied with the spraying medium: it approximated a cubic exponential value scaling for deionized (DI) water, a quartic exponential value for artificial saliva (AS), and between quadratic and cubic exponential value for beef extract solution (BES). The survivability of MS2 did not change significantly with particle size for DI water and BES, while that for AS was maximum at 120 nm. Viruses could be homogeneously distributed or aggregated inside or on the surface of the particles, depending on the composition of the spraying medium.

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Section: Survivability Of Ms2supporting

confidence: 85%

Determination of the distribution of infectious viruses in aerosol particles using water-based condensational growth technology and a bacteriophage MS2 model

Pan

Carol

Lednicky

et al. 2019

Aerosol Science and Technology

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“…This is especially important in the case of facemasks, since a high resistance of the filter media promotes a greater leakage of air around the edges of the mask. An inverse relationship between capture efficiency and resistance to flow has been observed in many cases (Soo et al 2016;Chien et al 2018;Dziubak and Dziubak 2020). Figure 1 illustrates three kinds of substances that may need to be resisted by air filtration media.…”

Section: Desired Attributes For Filter Mediamentioning

confidence: 99%

“…This type of effect will be especially important in cases where the cellulosic material has been subjected to high levels of shearing while in a wet condition, leading to a microfibrillated structure. Even ordinary cellulosic filter papers tend to have a relatively high pressure drop compared to some of the competing media, at similar levels of capture (Chien et al 2018). Finally, there can be a concern that the hydrophilic, eco-friendly surfaces of cellulosic materials may present a favorable breeding ground for microbes.…”

Section: Challenges For Cellulose-containing Facemasks and Filter Mediamentioning

confidence: 99%

“…In early work, Madsen and Madsen (1967) found that filters made from regenerated cellulose fibers (rayon) were able to match the filtration performance of polypropylene masks, for usage during surgery. Chien et al (2018) compared Whatman filter papers with respect to the collection of sulfuric acid mists. The papers having smaller pore size were shown to be more effective, but at the expense of higher pressure drop.…”

Section: Overviewmentioning

confidence: 99%

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Performance factors for filtration of air using cellulosic fiber-based media: A review

Owens

Hubbe

2023

BioRes

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The filtration of air has attracted increasing attention during recent waves of viral infection. This review considers published literature regarding the usage of cellulose-based materials in air filtration devices, including face masks. Theoretical aspects are reviewed, leading to models that can be used to predict the relationship between structural features of air filter media and the collection efficiency for different particle size classes of airborne particulates. Collection of particles can be understood in terms of an interception mechanism, which is especially important for particles smaller than about 300 nm, and a set of deterministic mechanisms, which become important for larger particles. The effective usage of cellulosic material in air filtration requires the application of technologies including pulp refining and chemical treatments with such additives as wet-strength agents and hydrophobic sizing agents. By utilization of high levels of refining, in combination with freeze drying and related approaches, there are opportunities to achieve high levels of interception of fine particles. A bulky layer incorporating nanofibrillated cellulose can be used in combination with a coarser ply to achieve needed strength in a filter medium. Results of recent research show a wide range of development opportunities for diverse air filter devices containing cellulose.

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