Ultrafine, self-crimp, and electret nano-wool for low-resistance and high-efficiency protective filter media against PM0.3

Li, Yuyao; Cao, Leitao; Yin, Xia; Si, Yang; Yu, Jianyong

doi:10.1016/j.jcis.2020.05.123

Cited by 47 publications

(43 citation statements)

References 45 publications

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“…[45][46][47][48][49][50][51][52][53][54] However, natural materials, including silk, wool, cellulose, soy protein, gelatin, and chitosan, took on greater significance due to increasing awareness for sustainability. [13,[55][56][57][58][59][60] Furthermore, expanded polystyrene (EPS) waste was successfully used for the production of air filters by electrospinning. [61] In addition to the material type and additives, which can be used to functionalize the formed fibers, [12] process variables such as applied voltage, flow rate, type of collector, and distance between needle tip and collector were adjusted to tailor the final fiber properties such as diameter, length, porosity, pore size, and morphology.…”

Section: Electrospinningmentioning

confidence: 99%

“…Depending on the concentration of MgSt, degrees of crystallinity of up to 46% could be achieved. [96] The combination of PVDF with HAP in nanowool felts resulted in surface potentials as high as 13,260 V. [60] Moreover, the incorporation of materials with high dielectric constants such as BaTiO 3 or magnetic Fe 3 O 4 improves the charge storage and results in good electret performance. [64,68] Furthermore, the defects of MOFs such as ZIF-8 could polarize the surface of pollutants, which will then interact with the positively charged ZIF-8.…”

Section: Materials Optimizationmentioning

confidence: 99%

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Review on Polymeric, Inorganic, and Composite Materials for Air Filters: From Processing to Properties

Henning

Abdullayev

Vakifahmetoğlu

et al. 2021

Adv Energy and Sustain Res

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Particulate and gaseous air pollutants pose a threat to human health and contribute to climate change. By today, air filters, stationary and portable, are markedly improved and can often provide innocuous air pollution levels. After introducing the classification and standards on air filters, the influence of the processing route and its parameters on the resulting air filter properties and consequently its performance are discussed. Numerous tools are presented to adjust structural properties such as fiber or pore diameter, specific surface area, surface charge, hydrophilicity, or photocatalytic activity to achieve the desired performance in terms of high filtration efficiencies, sufficient mechanical stability, regeneration eligibility, antimicrobial and optical properties. In particular, inorganic and composite materials as well as nonfibrous structures are covered, which are currently holding an outsider position in an air filter community dominated by polymeric materials and fibrous structures.

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Section: Electrospinningmentioning

confidence: 99%

Section: Materials Optimizationmentioning

confidence: 99%

Review on Polymeric, Inorganic, and Composite Materials for Air Filters: From Processing to Properties

Henning

Abdullayev

Vakifahmetoğlu

et al. 2021

Adv Energy and Sustain Res

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“…Self-crimped wool such as PVDF nanofibers have been obtained by electrospinning PVDF using DMF as a solvent at various RH such as 30%, 60%, and 90%. The moisture-mediated electrospinning allowed self-curling of nanofibers affected by tailored exchange between DMF and water molecules [ 116 ]. The bending perturbations have been found to be much lower at RH 90% producing ultraporous (98.7%) and ultrafine (0.6 μm fibers) wool like architecture that enhances the air flow drastically.…”

Section: Ultrafine Pvdf Nanofibers For Pm Removalmentioning

confidence: 99%

“…Such high electrostatic charge could assist in PM 0.3 removal at differential pressure of 50 Pa (c.f. Figure 11 ) [ 116 ].…”

Section: Ultrafine Pvdf Nanofibers For Pm Removalmentioning

confidence: 99%

Ultrafine PVDF Nanofibers for Filtration of Air-Borne Particulate Matters: A Comprehensive Review

Sanyal

Sinha-Ray

2021

Polymers

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The ongoing global pandemic has bestowed high priority uponthe separation of air-borne particulate matters (PMs), aerosols, etc. using nonwoven fibrous materials, especially for face masks as a means of personal protection. Although spunbond or meltblown nonwoven materials are amongst the forerunners for polymer microfiber-based face mask or air filter development in mass scale, relatively new process of nonwoven manufacturing such as electrospinning is gaining a lot of momentum amongst the filter membrane manufacturers for its scalability of nanofiber-based filter membrane fabrication. There are several nanofiber-based face masks developing industries, which claim a very high efficiency in filtration of particulate matters (PM0.1–10) as well as other aerosols for their products. Polyvinylidene fluoride (PVDF), which is commonly known for its use of tactile sensors and energy harvesters, due to its piezoelectric property, is slowly gaining popularity among researchers and developers as an air filter material. Electrospun PVDF nanofibers can be as fine as 50 nm in mass scale, which allows the membrane to have large surface area compared to its volume, enhancing nanofiber–PM interaction. At the same time, the breathability index can be improved through these PVDF nanofiber membranes due to their architectural uniqueness that promotes slip flow around the fibers. The conductive nature of PVDF makes it advantageous as a promising electret filter allowing better capturing of ultrafine particles. This review aims to provide a comprehensive overview of such PVDF nanofiber-based filter membranes and their roles in air filtration, especially its application in filtrate of air-borne PMs.

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“…Filter media available today are able to remove particles from the contaminated air; it is worth noting that the particles with a size of 1–100 nm are more harmful to one's health in comparison with those larger (submicron or micron‐sized) ones 197,198 . Inspired by the growing demand for clean air, all the world are in pursuit of air filters with extremely high filtration efficiency yet very low pressure drop 199,200 …”

Section: Applicationsmentioning

confidence: 99%

Polymer electrets and their applications

Wang

et al. 2020

J of Applied Polymer Sci

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Polymer electrets have revealed great potential application in electromechanical devices because of the low weight, large quasi‐piezoelectric sensitivity, and excellent flexibility. For an electret, a permanent and macroscopic electric field exists on the surface, principally led by a macroscopic electrostatic charge on the surface or a net orientation of polar groups inside the object. Here, progress in the development of polymer electrets is reviewed. After a brief retrospect of the research courses and those typical polymer electrets that are classified into fluorine polymer and nonfluorine polymer, we present a survey on the charging methods, including corona, soft X‐ray, contact, thermal and monoenergetic particle beams. The latest representative applications (i.e., power harvesting, sensors, field effect transistors, and biomedicine) based on polymer electrets are also summarized. Finally, we complete this review with a discussion on perspectives and challenges in this field.

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Ultrafine, self-crimp, and electret nano-wool for low-resistance and high-efficiency protective filter media against PM0.3

Abstract: Graphical abstract

Cited by 47 publications

References 45 publications

Review on Polymeric, Inorganic, and Composite Materials for Air Filters: From Processing to Properties

Review on Polymeric, Inorganic, and Composite Materials for Air Filters: From Processing to Properties

Ultrafine PVDF Nanofibers for Filtration of Air-Borne Particulate Matters: A Comprehensive Review

Polymer electrets and their applications

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