The use of nonwovens as filtration materials

Zobel, S.; Gries, Thomas

doi:10.1533/9781845699741.2.160

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…Composite structures usually consist of multiple layers, each layer serving a specific performance in the separation/filtration process ( Mukhopadhyay, 2014 ). The most popular combinations of such structures are spunbond–meltblown–spunbond (SMS), spunbond–meltblown–meltblown–spunbond (SMMS), spunbond–meltblown (SM), spunbond–spunbond (SS), spunbond–spunbond–spunbond (SSS), and spunbond–spunbond–meltblown–meltblown–spunbond (SSMMS) in different weight ranges ( Ajmeri and Ajmeri, 2011 ; Chellamani et al, 2013 ; Zobel and Gries, 2010 ). Fig.…”

Section: Filtration Materials and Processmentioning

confidence: 99%

Biodegradable and multifunctional surgical face masks: A brief review on demands during COVID-19 pandemic, recent developments, and future perspectives

Babaahmadi

Amid

Naeimirad

et al. 2021

Science of The Total Environment

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Providing the greater public with the current coronavirus (SARS-CoV-2) vaccines is time-consuming and research-intensive; intermediately, some essential ways to reduce the transmission include social distancing, personal hygiene, testing, contact tracing, and universal masking. The data suggests that universal masking, especially using multilayer surgical face masks, offers a powerful efficacy for indoor places. These layers have different functions including antiviral/antibacterial, fluid barrier, particulate and bacterial filtration, and fit and comfort. However, universal masking poses a serious environmental threat since billions of them are disposed on a daily basis; the current coronavirus disease (COVID-19) has put such demands and consequences in perspective. This review focuses on surgical face mask structures and classifications, their impact on our environment, some of their desirable functionalities, and the recent developments around their biodegradability. The authors believe that this review provides an insight into the fabrication and deployment of effective surgical face masks, and it discusses the utilization of multifunctional structures along with biodegradable materials to deal with future demands in a more eco-friendly fashion.

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Section: Filtration Materials and Processmentioning

confidence: 99%

Biodegradable and multifunctional surgical face masks: A brief review on demands during COVID-19 pandemic, recent developments, and future perspectives

Babaahmadi

Amid

Naeimirad

et al. 2021

Science of The Total Environment

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“…Non-wovens also have a thicker cross-section, bulk and high permeability, which are further boosted by pleating of the raw materials. 22 23 …”

Section: Filter Materials and Breathabilitymentioning

confidence: 99%

Last-resort strategies during mask shortages: optimal design features of cloth masks and decontamination of disposable masks during the COVID-19 pandemic

et al. 2020

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Face masks and respirators are the most widely used intervention measures for respiratory protection. In the wake of COVID-19, in response to shortages and lack of availability of surgical masks and respirators, the use of cloth masks has become a research focus. Various fabrics have been promoted with little evidence-based foundation and without guidelines on design principles for optimal performance. In these circumstances, it is essential to understand the properties, key performance factors, filter mechanisms and evidence on cloth masks materials. The general community might also need to decontaminate and reuse disposable, single-use devices as a last resort. We present an overview of the filter materials, filter mechanisms and effectiveness, key performance factors, and hydrophobicity of the common disposable masks, as well as cloth masks. We also reviewed decontamination methods for disposable respiratory devices. As an alternative to surgical masks and respirators, we recommend a cloth mask made of at least three layers (300–350 threads per inch) and adding a nylon stocking layer over the mask for a better fit. Water-resistant fabrics (polyesters/nylon), blends of fabrics and water-absorbing fabrics (cotton) should be in the outside layer, middle layer/layers and inside layer, respectively. The information outlined here will help people to navigate their choices if facing shortages of appropriate respiratory protection during the COVID-19 pandemic.

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“…Nonwoven (NW) textiles play a crucial role in many applications, including biomedical, separations, and hygiene . These materials have evolved to protect the wearers from particulate − and microbial agents , and mediate the selective exchange of soluble species in engineered systems (e.g., fuel cells and separation equipment). − Self-repair and self-healing fabrics have gained considerable interest owing to their extendable functionality and lifetime.…”

Section: Introductionmentioning

confidence: 99%

Dual-Responsive Microgels for Structural Repair and Recovery of Nonwoven Membranes for Liquid Filtration

Ramesh

Davis

Roros

et al. 2021

ACS Appl. Polym. Mater.

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This study presents dual-responsive colloidal microgels to repair nonwoven fiber mats (NWFs) and recover their native morphological and functional properties. The formulation comprises poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAmco-AA) microgels loaded with iron oxide nanoparticles acting as magneto-responsive "bricks" and poly(N-isopropylacrylamide-co-N-4-benzoylphenyl acrylamide) (PNIPAm-co-BPAm) serving as photo-cross-linkable "mortar". The formulation is employed to repair small tears in meltblown polypropylene (PP) and polybutylene terephthalate (PBT) NWFs and recover the functional properties of the native membranes. Specifically, magnetically directed and UV-light-triggered repair recovers (i) the topological integrity, as shown by optical microscopy and image analysis of PP and PBT NWFs, (ii) the mechanical properties, as demonstrated by the values of tensile modulus of native, damaged, and repaired PP NWFs, and (iii) the permeability to sodium chloride of both PP and PBT NWFs. A comparative study of repair using magneto-responsive and photo-cross-linkable vs photocross-linkable-only formulations demonstrate that magnetic localization is vital to ensure rapid, spatially accurate, and effective recovery of the morphological and functional properties of damaged NWFs.

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The use of nonwovens as filtration materials

Cited by 6 publications

References 2 publications

Biodegradable and multifunctional surgical face masks: A brief review on demands during COVID-19 pandemic, recent developments, and future perspectives

Biodegradable and multifunctional surgical face masks: A brief review on demands during COVID-19 pandemic, recent developments, and future perspectives

Last-resort strategies during mask shortages: optimal design features of cloth masks and decontamination of disposable masks during the COVID-19 pandemic

Dual-Responsive Microgels for Structural Repair and Recovery of Nonwoven Membranes for Liquid Filtration

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