Collection of Aerosol Particles by Filters Composed of Whisker-Coated Fibers

Kirsh, A. A.; Kirsh, V. A.

doi:10.1134/s1061933x19060073

Cited by 6 publications

(7 citation statements)

References 10 publications

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“…For example, large solid particles may remain uncollected by a porous shell with a high packing density of solid sharp needles. In this connection, it should be noted that it is reasonable to form highly porous shells with a high permeability, owing to which, their efficiency and the quality criterion of a filter increase [2].…”

Section: Discussionmentioning

confidence: 99%

“…In this case, the van der Waals force of particle attraction to the cylinder with radius is calculated by an equation, which is easy to derive under the additive approximation by integrating the energy of atomspherical particle interaction [14] over the cylinder volume: (8) The forces of the cylinder-particle interaction calculated by this equation have an order the same as have those calculated by Eq. (5) and much exceed Stokes force (2).…”

Section: Condition For Blowing a Particle From A Nanoneedlementioning

confidence: 96%

“…As an example, we calculated the velocity field of the Stokes flow around a row of fibers with surface layers consisting of radial needles. The method for calculating the flow field in a system of fibers with shells composed of nanocylinders has been presented in our previous work [2]. The simulation cell is shown in Fig.…”

Section: Flow Velocity On the Surface Of A Porous Shell Covering A Fibermentioning

confidence: 99%

“…As has been shown in recent communications [1,2] devoted to the intensification of fine air filtration, it is promising to create filters composed of submicron fibers coated with coaxial highly porous permeable shells (layers) consisting of nanofibers, including socalled nanowhiskers or nanoneedles oriented perpendicularly to the fiber surface (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it may be stated that inefficient collection is excluded for submicron particles, and this fact has been confirmed in practice: high-efficiency HEPA filters reduce particle concentrations by several orders of magnitude. However, this cannot always be realizable for modified filters recommended in [2], because the small area of the contact between thin sharp needles grown on fibers and collected particles may appear to be a reason for inefficient adhesion. The deposition of particles coated with thin needles may also be inefficient.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Nanoneedles Located on Fibers and Particles on Aerosol Filtration Efficiency

Kirsh

2021

Colloid J

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The deposition of aerosol particles in a filter composed of fibers coated with highly porous layers of radially oriented needles and the deposition of needle-coated particles onto smooth fibers have been studied. The Stokes flow fields in a model row of parallel fibers and near an individual needle-coated spherical particle have been calculated. A correction to the Stokes force for the drag of the layer of needles covering the particle has been found. The forces of the van der Waals interaction of the needles with the particle and the fiber have been calculated within the framework of the additive approximation, and the conditions have been determined under which the needles hinder particle deposition onto the fibers.

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Section: Discussionmentioning

confidence: 99%

Section: Condition For Blowing a Particle From A Nanoneedlementioning

confidence: 96%

Section: Flow Velocity On the Surface Of A Porous Shell Covering A Fibermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Nanoneedles Located on Fibers and Particles on Aerosol Filtration Efficiency

Kirsh

2021

Colloid J

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An investigative review of the expanded capabilities of thermal/optical techniques for measuring carbonaceous aerosols and beyond

Shen,

Zhi,

Zhang

et al. 2025

Environmental Pollution

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Bactericidal Hollow S-NiCo₂O₄ Nanoneedles for Air Purification

Liu,

Wang,

Sun

et al. 2023

ACS Appl. Nano Mater.

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One-dimensional (1D) nanoarray structures exhibit an electroporation effect at low voltages and are capable of transiently inactivating the passing bacteria, which is promising for air purification. However, the sterilization effect of electrode materials in current air filtration devices remains and needs further improvement owing to their low electron transfer efficiency and limited yield of reactive oxygen species (ROS). In this paper, we report the design of S-NiCo2O4 nanoneedles with hollow structures that exhibit superior antibacterial effects against both Gram-negative and Gram-positive bacteria at lower AC voltage and could be applied to air purification as an instantaneous sterilization device. Due to the hollow structure and the sulfur doping, the local electric field strength and ROS yield of S-NiCo2O4 were significantly increased. The results show that the inactivation rate of E. coli and S. aureus reached 99.9%, and 99.8% at a low AC voltage of 12 V and an air flow rate of 0.5 m/s. More importantly, through finite element simulation, the effects of hollow structure and curvature radius on the local electric field strength are analyzed, which in turn improve the electroporation effect. The experimental results also demonstrated that the increased active sites from S-doping led to remarkable growth in the ROS yield of the S-NiCo2O4 nanoneedles and further improved the sterilization efficiency.

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Collection of Aerosol Particles by Filters Composed of Whisker-Coated Fibers

Cited by 6 publications

References 10 publications

Influence of Nanoneedles Located on Fibers and Particles on Aerosol Filtration Efficiency

Influence of Nanoneedles Located on Fibers and Particles on Aerosol Filtration Efficiency

An investigative review of the expanded capabilities of thermal/optical techniques for measuring carbonaceous aerosols and beyond

Bactericidal Hollow S-NiCo₂O₄ Nanoneedles for Air Purification

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Collection of Aerosol Particles by Filters Composed of Whisker-Coated Fibers

Cited by 6 publications

References 10 publications

Influence of Nanoneedles Located on Fibers and Particles on Aerosol Filtration Efficiency

Influence of Nanoneedles Located on Fibers and Particles on Aerosol Filtration Efficiency

An investigative review of the expanded capabilities of thermal/optical techniques for measuring carbonaceous aerosols and beyond

Bactericidal Hollow S-NiCo2O4 Nanoneedles for Air Purification

Contact Info

Product

Resources

About

Bactericidal Hollow S-NiCo₂O₄ Nanoneedles for Air Purification