Supramolecular Nanofiber Webs in Nonwoven Scaffolds as Potential Filter Media

Misslitz, Holger; Kreger, Klaus; Schmidt, Hans‐Werner

doi:10.1002/smll.201202334

Cited by 23 publications

(21 citation statements)

References 42 publications

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“…These findings suggest an insignificant difference between the contents of BTA 1 and 2 being in good agreement with previous results 50. The nanofiber-morphology within the resulting composites was studied by means of scanning electron microscopy (SEM).Figure 3 shows SEM-micrographs of an overview and a corresponding magnified section of each microfiber-nanofiber composite containing BTA 1 and 2 processed from the different solvents.…”

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confidence: 85%

“…Under our conditions with a particle size 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 20 ethylhexyl)-1,3,5-benzenetricaboxamide BTA 3 (see Supporting Information Figure S6). 50 Both BTA 3 and BTA 1, are constitutional isomers featuring different branching of the side groups.…”

Section: Filtration Performance Of the Microfiber-nanofiber Compositesmentioning

confidence: 99%

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Tailoring Supramolecular Nanofibers for Air Filtration Applications

Weiß

Skrybeck

Misslitz

et al. 2016

ACS Appl. Mater. Interfaces

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The demand of new materials and processes for nanofiber fabrication to enhance the performance of air filters is steadily increasing. Typical approaches to obtain nanofibers are based on top-down processes such as melt blowing, centrifugal spinning, and electrospinning of polymer materials. However, fabrication of polymer nanofibers is limited with respect to either a sufficiently high throughput or the smallest achievable fiber diameter. This study reports comprehensively on a fast and simple bottom-up process to prepare supramolecular nanofibers in situ inside viscose/polyester microfiber nonwovens. Here, selected small molecules of the materials class of 1,3,5-benzenetrisamides are employed. The microfiber-nanofiber composites exhibit a homogeneous nanofiber distribution and morphology throughout the entire nonwoven scaffold. Small changes in molecular structure and processing solvent have a strong influence on the final nanofiber diameter and diameter distribution and, consequently, on the filtration performance. Choosing proper processing conditions, microfiber-nanofiber composites with surprisingly high filtration efficiencies of particulate matter are obtained. In addition, the microfiber-nanofiber composite integrity at elevated temperatures was determined and revealed that the morphology of supramolecular nanofibers is maintained compared to that of the utilized polymer nonwoven.

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confidence: 85%

Section: Filtration Performance Of the Microfiber-nanofiber Compositesmentioning

confidence: 99%

Tailoring Supramolecular Nanofibers for Air Filtration Applications

Weiß

Skrybeck

Misslitz

et al. 2016

ACS Appl. Mater. Interfaces

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“…Ahn et al [13] have found that filtration efficiency of Nylon 6 nanofilters is 99.993 % superior to commercialized High Efficiency Particulate Air (HEPA) filter at the face velocity of 5 cm/s using 0.3 um test particles, which shows the potential to have application of HEPA and Ultra Low Penetration Air (ULPA) grade high efficiency filter. What's more, nanofibers in filtration system applications can include air, oil, fuel filters for automotive [14], filters for beverage [15] and filter media for new air and liquid filtration applications [16]. Filter efficiency can be improved as the size of fibers decrease [17].…”

Section: Introductionmentioning

confidence: 99%

Study on highly filtration efficiency of electrospun polyvinyl alcohol micro-porous webs

Kong

2014

Indian J Phys

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Nanofibers have enormous applications in various areas such as environment, new energy, National security, filtration and so on. In this paper, polyvinyl alcohol micro-porous webs with excellent properties and highly filtration efficiency are fabricated using electrospinning. The solvent chosen is anhydrous formic acid and formic acid with concentration of 88 wt%. Filtration efficiency of fabrics strongly depends upon fiber size and pore size. A mathematical relationship between filtration efficiency and pore size is suggested.

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“…In contrast to this top‐down approach, self‐assembly of small molecules is a straightforward bottom‐up approach resulting in the in situ formation of supramolecular nano‐ and mesofibers. In this context, we have recently demonstrated that the class of 1,3,5‐benzenetrisamides are suitable to prepare supramolecular fibers in situ in polymer nonwovens with sufficient mechanical stability to be used as filter media in air filtration applications or as single fibers for energy transport . The overall supramolecular fiber density in the nonwovens is relatively high for filtration and consequently results in high pressure drops (Δ p ) during filtration.…”

Section: Introductionmentioning

confidence: 99%

Mesostructured Nonwovens with Penguin Downy Feather‐Like Morphology—Top‐Down Combined with Bottom‐Up

Burgard

Weiß

Kreger

et al. 2019

Adv Funct Materials

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Polymer fibers play an important role in nature and technical systems. Fiber morphologies with off-standing branches, as found in nature, e.g. in penguin downy feathers, provide unique properties but are unknown for man-made polymer fiber systems. We discovered that it is possible to initiate seeded growth from trisamide seeded polystyrene fibers, prepared by core-shell electrospinning, to form off-standing supramolecular trisamide branches similar to penguin downy feathers but in polymer nonwovens and in nanoscale. Resulting mesostructured nonwovens show unique properties. For example, air filtration efficiency of 99.8% for the filtration of 0.3 µm aerosol particles, being significantly higher compared to neat electrospun polystyrene nonwovens as bench-mark, showing only an efficiency of about 52.6%. Most remarkably, the pressure drop observed in filtration tests and thus, the energy consumption during filtration, did not increase up to a certain content of offstanding supramolecular fibrils. This is a unique behavior, as higher filtration capabilities are typically connected to higher energy consumptions and pressure drops. Hence, branching electrospun fibers with supramolecular fibrils paves the way to new mesostructured nonwovens with unique morphologies, property profiles and applications in filtration, catalysis, and energy storage/harvesting, exploiting nature's concepts.

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Supramolecular Nanofiber Webs in Nonwoven Scaffolds as Potential Filter Media

Cited by 23 publications

References 42 publications

Tailoring Supramolecular Nanofibers for Air Filtration Applications

Tailoring Supramolecular Nanofibers for Air Filtration Applications

Study on highly filtration efficiency of electrospun polyvinyl alcohol micro-porous webs

Mesostructured Nonwovens with Penguin Downy Feather‐Like Morphology—Top‐Down Combined with Bottom‐Up

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