Preparation and characterization of nanofibrous filtering media

Barhate, R.S.; Loong, Chong Kian; Ramakrishna, Seeram

doi:10.1016/j.memsci.2006.06.030

Cited by 200 publications

(121 citation statements)

References 15 publications

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“…One example of nanotechnology is the nanofiber, which has great advantages with regard to its large specific surface area, small pore size, and high porosity, for ultrafine particle filtration, nanocatalysis, tissue engineering, protective clothing, and other biomedical applications (Demir et al, 2002;Wang et al, 2008;Bhardwaj and Kundu, 2010). Among various methods developed to fabricate nanofibers, the electrospinning method is simple and effective, and it can be applied to a variety of polymers (Gibson et al, 2001;Hajra et al, 2003;Barhate et al, 2006;Yun et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Preparation of electrospun polyurethane filter media and their collection mechanisms for ultrafine particles

Choi

Kim

et al. 2013

Journal of the Air & Waste Management Association

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Electrospinning is a simple and versatile process to produce polymer nanofibers, which are useful for ultrafine particle filtration. In this study, a polyurethane filter with an average fiber diameter of 150-250 nm was prepared through the electrospinning process and its filtration characteristics were investigated. We found that the electrospun fiber diameter was highly dependent on the polyurethane concentration, electric field, and tip-to-collector distance. As the polyurethane concentration, electric field, and tip-tocollector distance under the same electric field increased, the fiber diameter increased. We also found that the produced filter media had a minimum collection efficiency at particles sizes from 80 to 100 nm, which implies an electrostatic attraction between the filter and the test particles. Furthermore, we observed that interception was a predominant collection mechanism at Peclet numbers higher than 10 in nanofiber filtration for ultrafine particles.Implications: A polyurethane nanofiber filter with excellent mechanical properties was prepared, and the effect of operating conditions on fiber morphology was examined. The filter fabricated by an electrospinning process is charged and has high filtration efficiency due to electrostatic force. Therefore, it can be a good alternative to control hazardous ultrafine particles.

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Section: Introductionmentioning

confidence: 99%

Preparation of electrospun polyurethane filter media and their collection mechanisms for ultrafine particles

Choi

Kim

et al. 2013

Journal of the Air & Waste Management Association

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“…Polymeric nanofibers are an emerging class of building block materials with applications in tissue engineering, 1,2 , filtration, 3 and nanocomposites. 4 They are fabricated by drawing, producing relatively long individual nanofibers in a batch process, 5 by template synthesis resulting in nanofibers that are tens of microns in length, 6 and by electrospinning, 7 allowing for mass production of long polymeric nanofibers in a continuous nonwoven form.…”

Section: Introductionmentioning

confidence: 99%

Novel method for mechanical characterization of polymeric nanofibers

Naraghi

Chasiotis

Kahn

et al. 2007

Review of Scientific Instruments

124

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A novel method to perform nanoscale mechanical characterization of highly deformable nanofibers has been developed. A microelectromechanical system ͑MEMS͒ test platform with an on-chip leaf-spring load cell that was tuned with the aid of a focused ion beam was built for fiber gripping and force measurement and it was actuated with an external piezoelectric transducer. Submicron scale tensile tests were performed in ambient conditions under an optical microscope. Engineering stresses and strains were obtained directly from images of the MEMS platform, by extracting the relative rigid body displacements of the device components by digital image correlation. The accuracy in determining displacements by this optical method was shown to be better than 50 nm. In the application of this method, the mechanical behavior of electrospun polyacrylonitrite nanofibers with diameters ranging from 300 to 600 nm was investigated. The stress-strain curves demonstrated an apparent elastic-perfectly plastic behavior with elastic modulus of 7.6± 1.5 GPa and large irreversible strains that exceeded 220%. The large fiber stretch ratios were the result of a cascade of periodic necks that formed during cold drawing of the nanofibers.

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“…BARHATE, et al [10] have obtained porous nanofibers with the PAN polymer (Mw = 150,000) of 500 nm by electrospinning method. The large surface area of these structures provides nanofibers with high pore volume and different sizes.…”

Section: Resultsmentioning

confidence: 99%

Production of polymeric nanofibers with different conditions of the electrospinning process

2017

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Nanofibers are materials that present high elasticity, strength, porosity and surface-area-to-volume ratio. The electrospinning method is the most widely adopted technique for forming polymeric nanofibers due to repeatability, easy scale-up process and production of long and continuous nanofibers. This method produces nanofibers with diameters ranging from 10 nm to 1000 nm. The process is regulated by many parameters which significantly affecting the morphology of the nanofibers, and through the proper handling of these parameters are obtained desired nanofibers in morphology and diameters. Based on this, the objective of this work was to evaluate the size and morphology of nanofibers obtained by different conditions of the electrospinning process. The electrospinning technique will be utilized to produce nanofibers with polyacrylonitrile (PAN) polymer and solvent N, N-dimethylformamide (DMF). The polymer solutions (10% (w/v)) were injected through of the capillary with diameter 0.45; 0.55; 0.70 and 0.80 mm. The distances from the collector to the capillary were tested between 100 and 200 mm, voltage between 15 and 25 kV, and feed rate of the solution between 100 and 1000 µL/h. All of the tests were conducted at 22 °C with the relative humidity level controlled at 65±1%. The morphology and size of nanofibers were evaluated by Scanning Electron Microscopy (SEM). Thus, the development of nanofibers with small diameter and high pore volume facilitate bioactive molecules loading and / or transport of nutrients and wastes, and allow the polymeric nanofibers become important class of biomaterials.

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Preparation and characterization of nanofibrous filtering media

Cited by 200 publications

References 15 publications

Preparation of electrospun polyurethane filter media and their collection mechanisms for ultrafine particles

Preparation of electrospun polyurethane filter media and their collection mechanisms for ultrafine particles

Novel method for mechanical characterization of polymeric nanofibers

Production of polymeric nanofibers with different conditions of the electrospinning process

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