Mass Production of Hierarchically Designed Engine-Intake Air Filters by Multinozzle Electroblow Spinning

Liu, Yibo; Jia, Chao; Li, Pan; Zhang, Han; Jia, Luna; Yu, Li-Wei; Wang, Rong; Liu, Dongkui; Wu, Hui; Li, Bo

doi:10.1021/acs.nanolett.2c00704

Cited by 13 publications

(5 citation statements)

References 44 publications

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“…(g) Filter performance upon 10 repetitive charging and discharging steps of the PBAT@CTAB-MMT NFM-based filter. (h) Performance comparison concerning basis weight and QF of various nanofiber filters made using the electrospinning technique. − …”

Section: Resultsmentioning

confidence: 99%

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

et al. 2022

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The massive production of polymer-based respiratory masks during the COVID-19 pandemic has rekindled the issue of environmental pollution from nonrecyclable plastic waste. To mitigate this problem, conventional filters should be redesigned with improved filtration performance over the entire operational life while also being naturally degradable at the end. Herein, we developed a functional and biodegradable polymeric filter membrane consisting of a polybutylene adipate terephthalate (PBAT) matrix blended with cetyltrimethylammonium bromide (CTAB) and montmorillonite (MMT) clay, whose surface properties have been modified through cation exchange reactions for good miscibility with PBAT in an organic solvent. Particularly, the spontaneous evolution of a partial core–shell structure (i.e., PBAT core encased by CTAB-MMT shell) during the electrospinning process amplified the triboelectric effect as well as the antibacterial/antiviral activity that was not observed in naive PBAT. Unlike the conventional face mask filter that relies on the electrostatic adsorption mechanism, which deteriorates over time and/or due to external environmental factors, the PBAT@CTAB-MMT nanofiber membrane (NFM)-based filter continuously retains electrostatic charges on the surface due to the triboelectric effect of CTAB-MMT. As a result, the PBAT@CTAB-MMT NFM-based filter showed high filtration efficiencies (98.3%, PM0.3) even at a low differential pressure of 40 Pa or less over its lifetime. Altogether, we not only propose an effective and practical solution to improve the performance of filter membranes while minimizing their environmental footprint but also provide valuable insight into the synergetic functionalities of organic–inorganic hybrid materials for applications beyond filter membranes.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

et al. 2022

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“…However, due to the low initial filtration efficiency and relatively high pressure drops across the filter bed, composites of synthetic layers and cellulose are used. A layer of 1-5 µm thick nanofibers with diameters of 300-800 nm is applied to a standard filter bed (cellulose) [32][33][34][35][36], which improves the filtration efficiency of dust grains below 5 µm in the engine intake air.…”

Section: Introductionmentioning

confidence: 99%

Experimental Testing of Filter Materials for Two-Stage Inlet Air Systems of Internal Combustion Engines

Dziubak

2024

Energies

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This paper presents an experimental study of the effect of the mass of dust retained on a fibrous filter bed operating singly and in a “cyclone-filter-bed” system on changes in filtration efficiency and accuracy, as well as the increase in flow resistance. The research was carried out using a novel and unprecedented method, determining the dust absorption coefficient km of the filter baffle under laboratory conditions. A filtration system built of a single cyclone and a cylindrical filter cartridge with an appropriately sized surface set behind it was studied. Conditions corresponding to the actual operating conditions of the air filter were maintained: dust concentration, filtration speed and dust extraction from the cyclone settling tank. The purpose of the research was to evaluate filter materials with different structures in terms of filtration efficiency and accuracy, as well as flow resistance. The study showed that the parameters of the structure of filter materials—permeability, grammage and thickness—affect the process of retaining dust particles. It was shown that the increase in the flow resistance of the filter bed has a higher intensity when dust grains of small sizes are directed at it, which is the case when the bed is operated behind a cyclone, which separates larger dust grains from the air. There is a reduction in the operating time of the filtration system due to the limitation of the permissible resistance ∆pfdop, and the corresponding dust absorption km has a lower value. For a fixed value of the flow resistance, the dust absorption coefficient km2 of three different filtration baffles AC, B2, and B, working with a cyclone, take values 50–100% smaller than when working in a single-stage system. It has been shown that the “cyclone-filter baffle” unit, due to its greater dust separation capability, allows the filter cartridge to operate for a longer time until a certain flow resistance is reached. This allows the unit to operate longer at lower flow resistance without changing the filter cartridge, thus saving energy. The km values obtained during the tests, using the proposed original method, allow the selection of the filter bed for specific vehicle operating conditions by modelling its course.

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“…Among them, electrospinning (ES), solution blow spinning (SBS) and their variations are certainly the most reported techniques used over the last years for the production of nanofibrous membranes for air filtration applications. [19,21,[24][25][26][39][40][41][42][43] These types of technology, in fact, allow obtaining nanofibers and consequently polymeric mats with high porosity, low pressure drops, good reusability, durability and appropriate mechanical properties. Moreover, these production techniques make the incorporation of micro-or nanoparticles into fibers extremely easy allowing to enhance mechanical properties and purification efficiency of the final device.…”

Section: Introductionmentioning

confidence: 99%

Nanofibrous Polymeric Membranes for Air Filtration Application: A Review of Progress after the COVID‐19 Pandemic

Scaffaro

Citarrella

2023

Macro Materials & Eng

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Air pollution is one of the major global problems causing around 7 million dead per year. In fact, a connection between infectious disease transmission, including COVID‐19, and air pollution has been proved: COVID‐19 consequences on human health are found to be more severe in areas characterized by high levels of particulate matter (PM). Therefore, after the COVID‐19 pandemic, the production of air filtration devices with high filtration efficiency has gained more and more attention. Herein, a review of the post‐COVID‐19 pandemic progress in nanofibrous polymeric membranes for air filtration is provided. First, a brief discussion on the different types of filtration mechanism and the key parameters of air filtration is proposed. The materials recently used for the production of nanofibrous filter membranes are presented, distinguishing between non‐biodegradable polymeric materials and biodegradable ones. Subsequently, production technique proposed for the fabrication of nanofibrous membranes, i.e., electrospinning and solution blow spinning, are presented aiming to analyze and compare filtration efficiency, pressure drop, reusability and durability of the different polymeric system processed with different techniques. Finally, present challenges and future perspectives of nanofibrous polymeric membranes for air filtration are discussed with a particular emphasis on strategies to produce greener and more performant devices.

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Mass Production of Hierarchically Designed Engine-Intake Air Filters by Multinozzle Electroblow Spinning

Cited by 13 publications

References 44 publications

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

Multifunctional Filter Membranes Based on Self-Assembled Core–Shell Biodegradable Nanofibers for Persistent Electrostatic Filtration through the Triboelectric Effect

Experimental Testing of Filter Materials for Two-Stage Inlet Air Systems of Internal Combustion Engines

Nanofibrous Polymeric Membranes for Air Filtration Application: A Review of Progress after the COVID‐19 Pandemic

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