Filtration Efficiency of Submicrometer Filters

Lalagiri, Muralidhar; Bhat, Gajanan; Singh, Vinitkumar; Parameswaran, Siva; Kendall, Ronald J.; Ramkumar, S.

doi:10.1021/ie403093t

Cited by 31 publications

(22 citation statements)

References 17 publications

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“…However, the most penetrating particle size, MPPS, remained constant within a factor of 1.54 (from 134 to 202 nm). Theoretical models predict a modest dependence of the MPPS on the fiber diameter (and thus pore size), and similar MPPS values between 170 and 225 nm are reported for melt blown filters with fiber diameters from 0.5 to 2 μm . Typical MPPS values for nanofiber based membranes are < 80 nm.…”

Section: Figuresupporting

confidence: 64%

Tailoring Pore Structure of Ultralight Electrospun Sponges by Solid Templating

et al. 2016

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Freeze-casted nanofiber based sponges or aerogels exhibit a hierarchical porous structure. Pore formation is only partially understood. Therefore, we studied the underlying solid templating mechanism. We were able to tailor the secondary pore size between 9.5 and 123 µm while retaining the smaller primary pores known from electrospun nanofiber membranes. To understand the effect of microstructure on the sponges' bulk properties, mass flow through the pores and interaction with the sponges' internal surface were investigated. By solely altering the sponges' microstructure we indeed found tunability in permeability by a factor 7 and in filtration efficiency by a factor of 220. Hence, pore architecture of nanofiber based sponges is a key element for their performance. The selected pullulan/PVA polymer blends and aqueous electrospinning conditions are benign and allow the facile adaptation of these ultralight highly porous sponges for a large number of applications.

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Section: Figuresupporting

confidence: 64%

Tailoring Pore Structure of Ultralight Electrospun Sponges by Solid Templating

et al. 2016

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“…The capture of NPs by conventional purification technologies, which focus on a size-dependent mechanism, is quite difficult due to their ultra-low mass and small particle size 17 . Traditional filters with regular pores act as an obstacle to the particle-transport path, and the filters can effectively intercept larger particles.…”

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confidence: 99%

High-performance particulate matter including nanoscale particle removal by a self-powered air filter

et al. 2020

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Particulate matter (PM) pollutants, including nanoscale particles (NPs), have been considered serious threats to public health. In this work, a self-powered air filter that can be used in high-efficiency removal of PM, including NPs, is presented. An ionic liquid-polymer (ILP) composite is irregularly distributed onto a sponge network to form an ILP@MF filter. Enabled by its unique electrochemical properties, the ILP@MF filter can remove PM 2.5 and PM 10 with high efficiencies of 99.59% and 99.75%, respectively, after applying a low voltage. More importantly, the charged ILP@MF filter realizes a superior removal for NPs with an efficiency of 93.77%. A micro-button lithium cell or silicon-based solar panel is employed as a power supply platform to fabricate a portable and self-powered face mask, which exhibits excellent efficacy in particulate removal compared to commercial masks. This work shows a great promise for high-performance purification devices and facile mask production to remove particulate pollutants.

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“…These properties render polymer nanofibers as interesting candidates to be used as material in, for example, air and water filtration and biomedical applications including tissue engineering and drug delivery as well as composite reinforcement, polymer melt modifiers, and polymer foam nucleation agents . Typically, polymer micro and nanofibers with defined fiber diameters are fabricated by top‐down processes from melt or solution through nozzles such as melt blowing, centrifugal spinning, and electrospinning . In these continuous processes, filaments with infinite fiber lengths are obtained.…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] Typically, polymer micro and nanofibers with defined fiber diameters are fabricated by top-down processes from melt or solution through nozzles such as melt blowing, centrifugal spinning, and electrospinning. [3][4][5][6][7][8][9][10][11] In these continuous homogeneous distribution of the fibers within a dispersion is required. Therefore, research is directed to evaluate cutting techniques for polymer nanofibers with defined lengths.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Aspect Ratio of Supramolecular Fibers by Ultrasonication

Steinlein

Kreger

Schmidt

2019

Macro Materials & Eng

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Tailoring the fiber length of supramolecular fibers with a homogeneous length distribution is challenging. Typically, self‐assembly processes, a bottom‐up approach, allow controlling the supramolecular fiber diameter but not the fiber length. Therefore, in this study, a top‐down approach, namely ultrasonication, is applied to achieve dimensional control of the length of supramolecular fibers. As a supramolecular building block, the benzenetrisamide (BTA),1,3,5‐tris(2,2‐dimethylpropionylamino)benzene (t‐Bu‐BTA), is selected since it effectively forms rigid supramolecular submicron fibers from solution. The important ultrasonication processing parameters, such as sonication time, fiber concentration, dispersion medium, and dispersion temperature are systematically varied to determine their influence on the final fiber length and length distribution. Controlling the cutting into short submicron fibers is readily achieved by adjusting the applied sonication time and the viscosity of the dispersion medium. Based on these results, it is now possible to tailor the aspect ratio of supramolecular submicron fibers.

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Filtration Efficiency of Submicrometer Filters

Cited by 31 publications

References 17 publications

Tailoring Pore Structure of Ultralight Electrospun Sponges by Solid Templating

Tailoring Pore Structure of Ultralight Electrospun Sponges by Solid Templating

High-performance particulate matter including nanoscale particle removal by a self-powered air filter

Controlling the Aspect Ratio of Supramolecular Fibers by Ultrasonication

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