Arbitrary alignment-angle control method of electrospun fibers: potential for a stretchable electrode material
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Abstract:
This paper presents a method by which it is possible to control the align-angle arbitrarily from vertical to horizontal demonstrating a mechanical stretch of as much as 120%. Fibers are aligned directly onto the sample surface.Keywords:
Sample (material)
Electrospinning
Shear Strength
Direct shear test
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Charpy impact test
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Reinforcing fibers, nanofillers, matrix materials, and manufacturing techniques all have a role in the mechanical characteristics of hybrid composites. MWCNTs-reinforced E-glass/Kevlar/epoxy composites are appropriate fillers for structural applications. The impact of different concentrations of MWCNT fillers (0.4%, 0.8%, and 1.2% wt) on the mechanical characteristics of hybrid composites has been studied. Tensile and bending strength, as well as hardness, were measured in compression-molded composites. The effects of compression pressure, mold temperature, and applied pressure on hybrid (0.8% MWCNT) were investigated. When it came to composite tensile and bending strength, compression pressure was the most important factor, closely succeeded by mold temperature and pressure period. Compression molding were optimized, resulting in a tensile strength of 183 MPa, a bending strength of 158.3 MPa, and a hardness value of 23.8 HV.
Compression molding
Kevlar
Molding (decorative)
Transfer molding
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A stable self-cleaning superhydrophobic modified fluorinated graphene surface with micro/nanostructure was successfully fabricated on copper substrates via drop coating process. Irregularly stacked island-like multilayered fluorinated graphene nanoflakes comprised the microstructure. The fabricated films exhibited outstanding superhydrophobic property with a water contact angle 167° and water sliding angle lower than 4°. The developed superhydrophobic surface showed excellent corrosion resistance with insignificant decrease of water contact angle 166° in 3.5 wt.% NaCl solution. This stable highly hydrophobic performance of the fluorinated graphene films could be useful in self-cleaning, antifogging, corrosion resistive coatings and microfluidic devices.
Superhydrophobic coating
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Liquid nitrogen
Carbon fibers
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Electrospinning
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Preparations of barium titanate microfibers made by electrospinning using a suspension of BaTiO3/PVC resin solution are described in this paper. The electrospun fibrous membrane of ceramic/PVC composite was heat treated at 600°C, 800°C and 1000 °C for 1 hr in air to remove organic components. The morphology and compositions at room temperature and the caused by effect of calcination on the fibrous membrane BaTiO3/PVC composite were investigated by SEM and ZAF. Typical fiber diameter was obtained between 14 μm and 20 μm with fibers lengths exceeding 500 μm with nanoporous whose diameters were formed between 350 nm and 700 nm into the microfibers.
Microfiber
Electrospinning
Nanoporous
Barium titanate
Suspension
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Glass fiber-reinforced epoxy resin (GFRE) composites filled with aluminum nitride (AlN) powder were fabricated, and their thermal and electrical properties were investigated. It is observed that with the increasing percentage of AlN particles, there is a significant enhancement in thermal conductivity and micro-hardness, but there is a decline in tensile strength. Experimental results demonstrate that the GFRE composites with 10 wt% of AlN loading show maximum dielectric breakdown strength of 30.26 kV/mm with minimum volume resistivity of 7.5 × 10 14 Ω cm and thermal conductivity value of 0.300 W/mK. Scanning electron microscopy studies were conducted to observe the voids and distribution of filler in composites.
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HNBR/short aramid fiber(DCAF)/fibrillar silicate(FS) composites were prepared by mechanical blending of in situ modified FS,DCAF and HNBR.The effects of the addition levels of DCAF and FS,and different lengths of DCAF on the structure and properties of the composites were investigated.The results showed that the moduli of the composites under both tension and compression conditions at small strain were increased by adding DCAF;the tensile properties and anisotropy of the composites could be improved when the length or addition levels of DCAF increased;the stress-strain behavior and compression modulus of the composites were improved significantly by adding FS.
Aramid
Tension (geology)
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A scalable processing method was used to fabricate graphite fiber composites with single-walled carbon nanotubes (SWCNTs) and the microstructures and properties of the fabricated laminates were investigated. SWCNTs were sprayed onto the surface of graphite/epoxy prepreg using an air spray. Interlaminar shear strength (ILSS) tests showed that the air spray processing had minimal effect on the quality of the laminates. Scanning electron microscopy (SEM) studies showed that SWCNTs are distributed uniformly in the plane of the laminate but not in the thickness direction due to low resin flow during cure. At high concentrations (>1.0 wt%), combination of a rather thick band of SWCNTs and low resin flow caused lack of resin inside of SWCNT bundles. The properties positively affected are in-plane shear strength, interlaminar fracture toughness (mode I), compressive strength, and electrical conductivity. Those properties showed improvement particularly when a lower concentration of SWCNTs was used. Fractography study using SEM showed altered crack propagation and crack bridging due to the presence of SWCNTs. The out-of-plane electrical conductivity was improved by 144% for 2 wt% SWCNT samples compared to samples without SWCNTs.
Fractography
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