Morphology of Nano and Micro Fiber Structures in Ultrafine Particles Filtration

Abstract

Abstract. Selected procedures permitting to prepare homogeneous nanofibre structures of the desired morphology by employing a suitable combination of variables during the electrospinning process are presented. A comparison (at the same pressure drop) was made of filtration capabilities of planar polyurethane nanostructures formed exclusively by nanofibres, space polycarbonate nanostructures having bead spacers, structures formed by a combination of polymethyl methacrylate micro-and nanofibres and polypropylene meltblown microstructures, through which ultrafine particles of ammonium sulphate 20 -400 nm in size were filtered. The structures studied were described using a new digital image analysis technique based on black and white images obtained by scanning electron microscopy. More voluminous structures modified with distance microspheres and having a greater thickness and mass per square area of the material, i.e. structures possessing better mechanical properties, demanded so much in nanostructures, enable preparation of filters having approximately the same free volume fraction as flat nanofibre filters but an increased effective fibre surface area, changed pore size morphology and, consequently, a higher filter quality.

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

“…PU solution in (DMF), based on MDI, PAIM polymer diol, M w =2×10 3 g mol −1 ) and BD was synthesized at the molar ratio 9:1:8 (PU 918) at 90 °C for 5 h per partes way of the synthesis, starting with the preparation of a pre-polymer from MDI and PAIM, followed by adding BD and the remaining quantity of MDI. After being supplemented with BC to idealize conductivity, the solution was electrospun at a concentration of 13 wt% PU with M w =9.8×10 4 g mol −1 [50].…”

“…However, these studies have been solely limited to the filtration of single natural or synthetic hormones [1,15,48,49]. This highlights the necessity of developing the least fiber diameter optimized nanofibers to extract such estrogenic hormones simultaneously and then gauge their kinetics for comparison [50].…”

Electrospun Nanofibrous Membranes for Air Filtration: A Critical Review

“…Nanofibres of different polymers, such as PU, PC, PA, and PVDF, were electrospun onto a spunbonded PP substrate or onto a commercial nonwoven fabric [96,97]. Electrospinning processes that allow spatial nanostructures with microspheres, as well as structures with a broad fibre distribution, have been reviewed by Kimmer et al [97].…”

Adsorption of Estrogenic Hormones in Aqueous Solution Using Electrospun Nanofibers From Waste Cigarette Butts: Kinetics, Mechanism, and Reusability

“…Additionally, in our previous study, we have reported polyurethane (PU), cellulose acetate (CA), and polyacrylonitrile (PAN) for such estrogenic hormones (unpublished data). Hence, it is necessary to develop and optimize such nanofibers produced from recycling that can reduce litter, behave ideally for removing EH, and require low production cost (Kimmer et al 2011).…”