Core–Shell Electrospun Hollow Aluminum Oxide  Ceramic Fibers

Rajala, Jonathan W.; Shin, Hyun Su; Lolla, Dinesh; Chase, George G.

doi:10.3390/fib3040450

Cited by 23 publications

(12 citation statements)

References 31 publications

(17 reference statements)

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“…Nanofibers can be produced using many different techniques such as self-assembly [7,11], template synthesis [7,12], phase separation [9,13], drawing [14,15] and electrospinning [16][17][18][19][20]. These manufacturing processes have advantages for specific fiber formation; however, they have some disadvantages from a processing standpoint.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Abutaleb

Lolla

Aljuhani³

et al. 2017

Fibers

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Electrospun fibers often have beads as byproducts. Bead formation can be substantially minimized by the introduction of additives, such as ionic salts or surfactants, to the electrospinning polymeric solution. Polyetherimide (PEI) fibers were fabricated using electrospinning. Four different additives, Lithium Chloride (LiCl), Sodium Chloride (NaCl), Triton X-100 and Hexadecyltrimethylammonium Bromide (HTAB) were utilized to alter the polymer solution electrical conductivity and surface tensions. The effects of solution conductivity and surface tension on the electrospinning and the thermal, mechanical stability of the polymeric fibers were investigated. Morphology, thermal properties, permeability and mechanical strength of the fiber mats were investigated using Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), Frazier Permeability Test, and Tensile tester respectively. The addition of 1.5wt.% HTAB was found to be the optimum concentration to produce PEI fibers without beads. The addition of HTAB produced fiber mats with higher air permeability, higher thermal stability and higher mechanical strength in comparison to the other additives. Finally, a filtration test was conducted on a simple custom model to compare the performance of beaded and non-beaded PEI fiber mats. The non-beaded PEI fiber mat performed better in terms of both separation efficiency (%E) and differential pressure drop (∆P) separating water droplets from diesel fuel.

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Section: Introductionmentioning

confidence: 99%

“…The setup is very simple, and the process is fast. Continues fibers can be easily produced and the scale up of this process seems possible [16][17][18][19][20]. The setup applied in this work is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Abutaleb

Lolla

Aljuhani³

et al. 2017

Fibers

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“…It gained research and commercial interest due to its simplicity, ease of maintenance and low cost of production of small quantities [12,13]. Electrospinning uses a high voltage DC current to generate electrostatic repulsions inside of droplets of polymers mixed with a volatile solvent.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Polarization of Electrospun Polyvinylidene Fluoride Electret Fibers and Effect on Capturing Nanoscale Solid Aerosols

Lolla

Abutaleb

et al. 2016

Materials

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Electrospun polyvinylidene fluoride (PVDF) fiber mats with average fiber diameters (≈200 nm, ≈2000 nm) were fabricated by controlled electrospinning conditions. These fiber mats were polarized using a custom-made device to enhance the formation of the electret β-phase ferroelectric property of the fibers by simultaneous uniaxial stretching of the fiber mat and heating the mat to the Curie temperature of the PVDF polymer in a strong electric field of 2.5 kV/cm. Scanning electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, differential scanning calorimetry and Brunauer-Emmett-Teller (BET) surface area analyses were performed to characterize both the internal and external morphologies of the fiber mat samples to study polarization-associated changes. MATLAB simulations revealed the changes in the paths of the electric fields and the magnetic flux inside the polarization field with inclusion of the ferroelectric fiber mats. Both polarized and unpolarized fiber mats were challenged as filters against NaCl particles with average particle diameters of about 150 nm using a TSI 8130 to study capture efficiencies and relative pressure drops. Twelve filter experiments were conducted on each sample at one month time intervals between experiments to evaluate the reduction of the polarization enhancement over time. The results showed negligible polarization loss for the 200-nm fiber sample. The polarized mats had the highest filter efficiencies and lowest pressure drops.

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“…The results showed the MPEM could decrease the nanofiber diameter, enhance the diameter distribution, and improve the nanofiber alignment. Recently, using the ES technique, many functional nanomaterials have been developed using various polymers, such as poly(vinylidene fluoride) (PVDF) [25], poly(methyl methacrylate) (PMMA) [26,27], polylactic acid (PLA) [28], and poly-N-vinylpyrrolidone (PVP) [29,30]. Polyacrylonitrile (PAN), a well-known polymer with good stability and mechanical properties, has been widely used in producing electrospun nanofibers due to their excellent characteristics, such as spinnability, environmentally benign nature, and commercial availability [31].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Highly Aligned Carbon Nanotubes/Polyacrylonitrile Composite Nanofibers

et al. 2017

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Abstract:In the electrospinning process, a modified parallel electrode method (MPEM), conducted by placing a positively charged ring between the needle and the parallel electrode collector, was used to fabricate highly aligned carbon nanotubes/polyacrylonitrile (CNTs/PAN) composite nanofibers. Characterizations of the samples-such as morphology, the degree of alignment, and mechanical and conductive properties-were investigated by a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), universal testing machine, high-resistance meter, and other methods. The results showed the MPEM could improve the alignment and uniformity of electrospun CNTs/PAN composite nanofibers, and enhance their mechanical and conductive properties. This meant the successful preparation of highly aligned CNT-reinforced PAN nanofibers with enhanced physical properties, suggesting their potential application in appliances and communication areas.

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Core–Shell Electrospun Hollow Aluminum Oxide Ceramic Fibers

Cited by 23 publications

References 31 publications

Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Fabrication, Polarization of Electrospun Polyvinylidene Fluoride Electret Fibers and Effect on Capturing Nanoscale Solid Aerosols

Preparation and Characterization of Highly Aligned Carbon Nanotubes/Polyacrylonitrile Composite Nanofibers

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