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Nano Research 2022年第6期15卷 5695-5704页

作者： Kangli Xu Jixia Deng Guangliang Tian Lei Zhan Jiajia Ma Lijun Wang Qinfei Ke Chen Huang Engineering Research Center of Technical Textiles Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Changshu Weicheng Nonwoven Equipment Co. Ltd.Suzhou215539China

Fiber morphology with off-standing branches,as found in nature,e.g.,in goose downy feather,provides exquisite functions that can be barely achieved by man-made fiber *** this work,we develop a simple and scalable method for generating downy feather-like para-aramid fibers and *** treating commercial para-aramid microfibers with mild alkaline solution(low concentration of NaOH),a synergistic effect of chemical hydrolysis and physical shearing is successfully triggered to generate abundant nanofiber branches on the surface of para-aramid *** compared with conventional monotonous structures,nonwovens composed of downy feather-like fibers exhibit a typical multiscale fiber morphology,larger specific surface area and smaller pore size,thus showing enhanced particles adsorption capacity(over twice of the pristine nonwoven),excellent oil absorption capacity(increased by~50%),improved air filtration performances(doubled the filtration efficiency)and effective thermal insulation(thermal conductivity=26.1 mW·m^(−1)·K^(−1)).More attractively,the intrinsic flame-retardant nature of para-aramid is well inherited by the downy feather-like fibers,and the fabrication process requires neither sophisticated equipment,nor tedious procedures,making us believe the strong competitiveness of these fibers and assemblies.

关键词： downy feather-like fibers nanofibrils para-aramid nonwoven surface fibrillation oil absorption air filtration

Electrospun Nanocomposite Fibrous Membranes for Sustainable Face Mask Based on Triboelectric Nanogenerator with High air filtration Efficiency

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Advanced Fiber Materials 2023年第4期5卷 1505-1518页

作者： Yue Yang Yuchen Yang Jianying Huang Shuhui Li Zheyi Meng Weilong Cai Yuekun Lai College of Chemical Engineering Fuzhou University350116 FuzhouPeople’s Republic of China Qingyuan Innovation Laboratory 362801 QuanzhouPeople’s Republic of China Department of Chemistry University College LondonLondon WC1H 0AJUK Wenzhou Institute University of Chinese Academy of ScienceZhejiang 325000 WenzhouPeople’s Republic of China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University201620 ShanghaiPeople’s Republic of China

air pollution caused by the rapid development of industry has always been a great issue to the environment and human being’s ***,the efficient and persistent filtration to PM_(0.3) remains a great ***,a self-powered filter with micro-nano composite structure composed of polybutanediol succinate(PBS)nanofiber membrane and polyacrylonitrile(PAN)nanofiber/polystyrene(PS)microfiber hybrid mats was prepared by *** balance between pressure drop and filtration efficiency was achieved through the combination of PAN and *** addition,an arched TENG structure was created using the PAN nanofiber/PS microfiber composite mat and PBS fiber *** by respiration,the two fiber membranes with large difference in electronegativity achieved contact friction charging *** open-circuit voltage of the triboelectric nanogenerator(TENG)can reach to about 8 V,and thus the high filtration efficiency for particles was achieved by the electrostatic *** contact charging,the filtration efficiency of the fiber membrane for PM_(0.3) can reach more than 98%in harsh environments with a PM_(2.5) mass concentration of 23,000µg/m^(3),and the pressure drop is about 50 Pa,which doesn’t affect people’s normal ***,the TENG can realize self-powered supply by continuously contacting and separating the fiber membrane driven by respiration,which can ensure the long-term stability of filtration *** filter mask can maintain a high filtration efficiency(99.4%)of PM_(0.3) for 48 consecutive hours in daily environments.

关键词： Electrospinning Self-powered filter structure Triboelectric nanogenerator air filtration

Fabrication of High-Efficiency Polyvinyl Alcohol Nanofiber Membranes for air filtration Based on Principle of Stable Electrospinning

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Journal of Donghua University(English Edition) 2023年第2期40卷 142-148页

作者：高婷婷郑军妹王丹阳 Ningbo Fotile Kitchen Ware Company Ningbo 315336China Key Laboratory of Healthy&Intelligent Kitchen System Integration of Zhejiang Province Ningbo 315336China

A mass flow matching model(MFMM)was established for studying the stable status of solution *** study of the solution droplet status at the needle tip focused on various combinations of applied voltages and injection rates to figure out their influence on steadily fabricating polyvinyl alcohol(PVA)nanofibers prepared from PVA spinning solutions with two different mass fractions(10%and 16%).The results revealed that during the stable electrospinning,the influence resulted from the change of the injection rate approximately canceled out the impact brought by adjusting the applied voltage,leading to almost the same morphology as that of the PVA *** the mass fraction of PVA in the spinning solution dominated the structure and the diameter distribution of the electrospun *** stable electrospinning conditions,the composite membrane was produced by depositing PVA nanofibers on the polyethylene terephthalate(PET)nonwoven substrate for an air filtration ***,the prepared composite membrane exhibited a high air filtration efficiency(99.97%)and a low pressure drop(120 Pa)for 300-500 nm neutralized polystyrene latex(PSL)aerosol particles,demonstrating its potential as an alternative for a variety of commercial applications in air filtration.

关键词： polyvinyl alcohol(PVA) nanofiber stable electrospinning air filtration membrane

An extended analysis of cardiovascular benefits of indoor air filtration intervention among elderly:a randomized crossover trial(Beijing indoor air purifier study,BIAPSY)

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Global Health Journal 2022年第1期6卷 30-34页

作者： Jie Chen Tong Wang Hongbing Xu Yutong Zhu Yipeng Du Beibei Liu Qian Zhao Yi Zhang Lingyan Liu Ningman Yuan Jiakun Fang Yunfei Xie Shuo Liu Rongshan Wu Danqing Shao Xiaoming Song Bei He Bert Brunekreef Wei Huang Institute for Risk Assessment Sciences Utrecht UniversityP.O.Box 801253508 TC UtrechtThe Netherlands Department of Occupational and Environmental Health School of Public HealthPeking UniversityBeijing 100191China Peking University Institute of Environmental Medicine Peking UniversityBeijing 100191China Key Laboratory of Molecular Cardiovascular Sciences of Ministry of Education Peking UniversityBeijing 100191China Department of Respiratory Medicine Peking University Third HospitalBeijing 100191China Section of Environmental Health Department of Public HealthUniversity of CopenhagenCopenhagen1353 Copenhagen KDenmark State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Ecological Effect and Risk Assessment of ChemicalsChinese Research Academy of Environmental SciencesBeijing 100012China

Objective Evidence on potential cardiovascular benefits of personal-level intervention among the elderly exposed to high levels of particulate matter(PM)remains *** aimed to assess improvements in surrogate markers of cardiovascular injury in vulnerable populations at risks by using indoor air filtration *** We conducted a randomized crossover trial for 2 separate 2-week air filtration interventions in 20 households of patients with stable chronic obstructive pulmonary disease and their partners in the winter of 2013,with concurrent measurements of indoor *** changes in biomarkers indicative of cardiac injury,atherosclerosis progression and systemic inflammation following intervention were evaluated using linear mixed-effect *** In the analysis,average levels of indoor PM with aerodynamic diametersair *** reduction was accompanied by improvements in levels of high-sensitivity cardiac troponin I by−84.6%(95%confidence interval[CI]:−90.7 to−78.6),growth differentiation factor-15 by−48.1%(95%CI:−31.2 to−25.6),osteoprotegerin by−65.4%(95%CI:−56.5 to−18.7),interleukin-4 by−46.6%(95%CI:−62.3 to−31.0)and myeloperoxidase by−60.3%(95%CI:−83.7 to−3.0),*** Indoor air filtration intervention may provide potential cardiovascular benefits in vulnerable populations at risks.

关键词： air filtration Indoor air pollution Particulate matter Cardiovascular benefit Elderly

Cleaning air filtration induced invasive pulmonary aspergillosis: a case report

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Cleaning air filtration induced invasive pulmonary aspergill...

Advances in particulate matter filtration:Materials,performance,and application

2018年（第四十届）浙江省医学会呼吸系病学术年会

作者： Wei-Na Huang Xiao-Ping Huang Chao Cao Department of Respiratory Medicine Ningbo First Hospital

Background: The Aspergillus is known to predominantly affect the immunocompromised host, but it is rare to cause acute invasive pulmonary aspergillosis(IPA) in immunocompetent hosts which is invariably fatal. Here we report a case of acute IPA in an immunocompetent patient after cleaning air filtration with no underlying disease. This is the first case in the literature about cleaning air filtration induced pulmonary *** presentation: An immunocompetent 41-year-old man presented with several days history of fever and productive cough with respiratory distress. These symptoms were unresponsive to treatments for pulmonary bacterial infection. He was exposed to air conditioning dust during cleaning air filtration. Computed tomography images revealed the characteristic tree-in-bud pattern along the bronchus and bronchiolitis associated with thickened bronchial walls. Later the galactomannan(GM) test in BALF was positive. So we performed empirical antifungal treatment with intravenous voriconazole 400 mg/d for 4 months. The patient recovered after antifungal therapy. Later microbiological examination of the BALF revealed growth of A. fumigatus *** :In cases of pulmonary dysfunction after cleaning air filtration, with tree-in-bud pattern along the bronchus and bronchiolitis associated with thickened bronchial walls on the CT, clinicians should consider aspergillus inhalation as an aetiology, and early antifungal therapy is recommended. And we should consider an occupational hazard for air conditioning sweeper.

关键词： pulmonary aspergillosis air filtration immunocompetent patient

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Green Energy & Environment 2023年第3期8卷 673-697页

作者： Xuzheng Ji Jianying Huang Lin Teng Shuhui Li Xiao Li Weilong Cai Zhong Chen Yuekun Lai College of Chemical Engineering Fuzhou UniversityFuzhou350116China b Qingyuan Innovation Laboratory Quanzhou362801China Department of Chemistry University College LondonLondonWC1H 0AJUK School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore

air-borne pollutants in particulate matter(PM)form,produced either physically during industrial processes or certain biological routes,have posed a great threat to human *** during the current COVID-19 pandemic,effective filtration of the virus is an urgent matter *** this review,we first introduce some fundamentals about PM,including its source and classification,filtration mechanisms,and evaluation *** filtration materials and their functions are then summarized,among which polymers and MOFs are discussed in detail together with their antibacterial *** discussion on the application is divided into end-of-pipe treatment and source ***,we conclude this review with our prospective view on future research in this area.

关键词： air filtration PM capture End-of-pipe treatment Source control COVID-19

Scalable and Heavy Foam Functionalization by Electrode-Inspired Sticky Jammed Fluids for Efficient Indoor air-Quality Management

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Energy & Environmental Materials 2023年第2期6卷 175-184页

作者： Yuan Ji Lei Jing Zhuxi Ni Bo Yin Mingbo Yang Wei Yang Yu Wang College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

Functionalization of polymer foams by surface coating is of great interest for advanced flow-interactive materials working with well-controlled 3D open ***,realizing heavy functional coating via a fast and recyclable way remains a big ***,inspired by the battery electrodes,we propose a scalable mechanic-assisted heavy coating strategy based on the design of sticky jammed fluid(SJF)to conquer the above *** to the electrode slurry,the SJF is dominated by a high concentration of active material(≥20 wt%of active carbon,for instance)uniformly dispersed in a protein binder *** to the sticky and solidrich nature of the SJF,one can realize a high coating efficiency of 60 wt%gain per *** critical factors controlling the coating processing and quality are further identified and ***,the functionalized foam is demonstrated as a high-performance shape-customizable toxic gas remover,which can absorb formaldehyde very efficiently at different circumstances,including static adsorption,flow-based filtration,and source ***,the foam skeleton and the active materials are easily recycled by a facile solvent *** study may inspire new scalable way for fast,heavy,and customizable functionalization of polymeric foams.

关键词： air filtration conductive foam catalysis functional polymer foams microadhesion-guided technology surface coating and functionalization

A computational fluid dynamics investigation of a novel flooded-bed dust scrubber with vibrating mesh

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International Journal of Mining Science and Technology 2022年第3期32卷 525-537页

作者： Zhaokuan Lu Aishwarya Rath Seyed Hassan Amini Aaron Noble Shima Shahab Department of Mechanical Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24061USA Department of Mining Engineering West Virginia UniversityMorgantownWV 26506USA Department of Mining and Minerals Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24061USA

This work proposes a vibrating mesh screen as an alternative to the static mesh screen currently used in conventional flooded-bed dust scrubbers for removing airborne coal mine dust in the continuous mining *** assessments suggest that a vibrating screen may improve the dust collection efficiency of scrubber systems and mitigate the clogging issues associated with the conventional *** evaluate this hypothesis,computational fluid dynamics(CFD)simulations were carried out to assess the effects of vibration conditions(i.e.,frequency and amplitude)on the dust particle-mesh interaction and mesh wetting conditions,which are the two decisive factors in determining the dust collection *** results suggest that the vibrating mesh screen can enhance dust particle collision opportunities on the mesh and increase mesh wetted area as compared to the static mesh *** effects of mesh screen aperture,coal dust concentration,and spray nozzle flow rate on the performance of the vibrating mesh are also ***,a simplified three-phase flow simulation including airflow,dust particles,and water droplet spray is performed,and the results reflect a significant improvement of dust collection efficiency in the liquid-coated vibrating mesh screen.

关键词： Dust control air filtration Flooded-bed scrubber Vibrating mesh filter Continuous miner Computational fluid dynamics Multiphase flow

Multi-layered micro/nanofibrous nonwovens for functional face mask filter

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Nano Research 2022年第8期15卷 7549-7558页

作者： Yuanqiang Xu Xiaomin Zhang Defang Teng Tienan Zhao Ying Li Yongchun Zeng College of Textiles Donghua UniversityShanghai 201620China

The worldwide COVID-19 pandemic has led to an attention on the usage of personal protective face ***,the longevity and safety of the commercial face masks are limited due to the charge dissipation of the electret meltblown nonwovens,which are dominate in the face mask ***,we design a type of multi-layer structured nonwovens using meltblowing and electrospinning *** complex nonwovens involving meltblown and electrospun fibers are designed to possess multilevel fiber diameters and pore *** micro/nanofibers with porous and wrinkled surface morphologies can well capture particulate matters(PMs),and the multilevel pore sizes contribute to low air resistance under high filtration *** field simulation was carried out to understand the pressure distribution within the nonwovens in the filtration ***,by adding Ag nanoparticles(AgNPs)as additives,the nonwovens exhibit excellent antibacterial *** resultant nonwovens exhibit filtration efficiency of 99.1%for PM0.3 and low pressure drop of 105 Pa under the 10.67 cm/s inlet air velocity,and antibacterial rate of>99.99%for Escherichia *** performances and functions make the designed complex nonwovens a promising filter core for face masks.

关键词： meltblowing electrospinning air filtration antibacterial face masks

Silk nanofibers as high efficient and lightweight air filter

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Nano Research 2016年第9期9卷 2590-2597页

作者： Chunya Wang Shuyi Wu Muqiang Jian Jiarong Xie Luping Xu Xudong Yang Quanshui Zheng Yingying Zhang Department of Chemistry & Center for Nano and Micro Mechanics Tsinghua UniversityBeijing 100084China Department of Engineering Mechanics & Center for Nano and Micro Mechanics Tsinghua UniversityBeijing 100084China Department of Building Science Tsinghua UniversityBeijing 100084China

Silk is a widely available, edible, biocompatible, and environmentally sustainable natural material. Particulate matter (PM) pollution has drawn considerable attention because it is a serious threat to public health. Herein, we report a human-friendly silk nanofiber air filter, which exhibits superior filtration efficiency for both PM2.5and submicron particles with obviously low pressure drop and low basis weight compared to typical commercial microfiber air filters. Additionally, other functions such as antibacterial activity could be easily integrated into the silk nanofiber air filters, enabling the fabrication of multifunctional air filters. All the above characteristics, combined with the natural abundance and biocompatibility of silk, suggest a great potential for the use of silk nanofibers as air filters, especially as comfortable and personal air purifiers. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： silk nanofibers air filtration PM2.5 submicron particles lightweight