scholarly journals Improved Electrical Conductivity of Carbon/Polyvinyl Alcohol Electrospun Nanofibers

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Nader Shehata ◽  
Nabil Madi ◽  
Mariam Al-Maadeed ◽  
Ibrahim Hassounah ◽  
Abdullah Ashraf
Keyword(s):  
Electrical Conductivity ◽  
Polyvinyl Alcohol ◽  
Mass Loss ◽  
Carbon Nanofibers ◽  
Mechanical Characteristics ◽  
Gas Adsorption ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Sem Images ◽  
Deposition Techniques

Carbon nanofibers (CNFs) gained much interest in the last few years due to their promising electrical, chemical, and mechanical characteristics. This paper investigates a new nanocomposite composed of carbon nanofibers hosted by PVA and both are integrated in one electrospun nanofibers web. This technique shows a simple and cheap way to offer a host for CNFs using traditional deposition techniques. The results show that electrical conductivity of the formed nanofibers has been improved up to 1.63 × 10−4 S/cm for CNFs of weight 2%. The peak temperature of mass loss through TGA measurements has been reduced by 2.3%. SEM images show the homogeneity of the formed PVA and carbon nanofibers in one web, with stretched CNFs after the electrospinning process. The formed nanocomposite can be used in wide variety of applications including nanoelectronics and gas adsorption.

Fabrication of Polyacrylonitrile Nanofiber Membranes Functionalized With Metal Organic Framework for CO2 Capturing

2015 ◽  
Author(s):  
Wahiduzzaman ◽  
Mujibur Khan ◽  
Saheem Absar ◽  
Spencer Harp ◽  
Kyle Edwards ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Fiber Surface ◽  
Precursor Solution ◽  
Electrospun Nanofibers ◽  
Primary Component ◽  
Secondary Process ◽  
Sem Images ◽  
Filter System ◽  
Metal Organic

Crystalline particles known as Metal Organic Frameworks (MOF’s) are known for their large surface area and high adsorption and storage capacity for CO2 gas. Electrospun nanofibers are considered as ideal substrates for synthesizing the MOF particles on the fiber surface. In this project, Polyacrylonitrile (PAN) and a Cu-based MOF known as HKUST-1 were selected as substrate fibers and adsorbent particles respectively. A precursor solution of PAN polymer hybridized with HKUST-1 particles dissolved in Dimehtylformamide (DMF) is used as the primary component solution for electrospinning. SEM images of the electrospun fibers showed small MOF particles formation into the fiber structure. A secondary solvothermal process of MOF particles growing on the fibers was then executed to increase the amount of MOF particles for effectual gas adsorption. The secondary process consists of multiple growth cycles and SEM images showed uniform distribution of porous MOF particles of 2–3μm in size on the fiber surface. EDS report of the fiber confirmed the presence of MOF particles through identification of characteristic Copper elemental peaks of HKUST-1. Thermogravitmetric analysis (TGA) of HKUST-1 doped PAN fiber displayed 32% of total weight loss between 180°C and 350°C thus proving the as-synthesized MOF particles are thermally stable within the mentioned temperature range. A comparative IR spectroscopic result between the gas-treated and gas-untreated fiber samples showed the presence of characteristic peak in the vicinity of 2300 and 2400cm−1 which corroborates the assertion of adsorption of CO2 on the system. Further step involved is to investigate the gas adsorption capacity of the filter system in an experimental test bench. Non-dispersive Infrared (NDIR) CO2 sensors will be used at the gas inlet and outlet parts to measure the concentration of CO2 and determine the amount of gas uptake by the filter system.

Preparation and characterization of polyvinyl alcohol/carbon nanotube (PVA/CNT) conductive nanofibers

2012 ◽  
Vol 32 (6-7) ◽  
pp. 407-413 ◽  
Author(s):  
Ozcan Koysuren
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Polyvinyl Alcohol ◽  
Specific Capacitance ◽  
Electrode Surface ◽  
Electrospinning Process ◽  
Morphology Analysis ◽  
Highly Porous

Abstract The aim of this study was to prepare polyvinyl alcohol/carbon nanotube (PVA/CNT) conductive nanofibers by the electrospinning process. Prior to composite preparation, carbon nanotubes are dispersed homogeneously in N-methyl-2-pyrrolidone (NMP) and mixed with a PVA solution. A series of PVA/CNT films and nanofibers with various CNT compositions are prepared. Electrical conductivity and specific capacitance of spin-coated PVA/CNT films and electrospun PVA/CNT fibers increase with an increase in CNT content. Electrospun PVA/CNT nanofibers with a larger electrode surface result in a higher specific capacitance when compared with spin-coated PVA/CNT films. According to the morphology analysis, homogeneous and highly porous PVA/CNT mats containing 50–300 nm diameter nanofibers are obtained by the electrospinning process.

Morphology and Mechanical Properties of the Polyurethane/PANI-DBSA Blend Nanofibers by the Electrospinning Technique

2013 ◽  
Vol 651 ◽  
pp. 87-90 ◽  
Author(s):  
Xiu Lian Wang ◽  
Liu Xue Zhang
Keyword(s):  
Sulfonic Acid ◽  
Composite Nanofibers ◽  
Weight Ratio ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Electrospinning Process ◽  
Sem Images ◽  
Electrospinning Technique ◽  
Dodecylbenzene Sulfonic Acid ◽  
Morphology And Mechanical Properties

In this study, composite nanofibers of polyaniline doped with dodecylbenzene sulfonic acid (PANI-DBSA) and polyurethane (PU) were prepared via an electrospinning process. The morphology, diameter, and structure of the electrospun nanofibers were investigated. SEM images showed that the morphology and diameter of the nanofibers were mainly affected by the weight ratio of the blend. The average diameter of the nanofibers was 370–1620 nm. The diameter gradually decreased with increasing PANI-DBSA content in the blend, and more beads were obtained in the composite.

Study on the Electrospun Fluorescent Nanofiber Webs Doped with Hemicyanine Dye

2011 ◽  
Vol 175-176 ◽  
pp. 593-597
Author(s):  
Chuan Xiang Qin ◽  
Ming Bo Gu ◽  
Li Xing Dai ◽  
Guo Qiang Chen
Keyword(s):  
Polyvinyl Alcohol ◽  
Room Temperature ◽  
Single Photon ◽  
Emission Spectra ◽  
Electrospinning Process ◽  
Technological Parameters ◽  
Fluorescent Properties ◽  
Sem Images ◽  
Hemicyanine Dye ◽  
Sem Morphology

One hemicyanine dye, DHEASPBr-C2, has been synthesized in this paper and incorporated by doping to Polyvinyl Alcohol (PVA) to prepare the fluorescent nanofiber webs. SEM morphology and fluorescent properties of the electrospun webs were tested. Results showed that it is feasible to develop fluorescent orange nano-fibre webs from those incorporating solutions using electrospinning process (ESP) at room temperature. When measuring fibres selected from each electronspun webs in SEM images, the fibres diameters changed between 200 nm and 400 nm with the change of electrospinning technological parameters. The reflectance spectra of the electrospun webs showed that there are obvious sorption spectra in the range 380-550 nm and emission spectra in the range 560-700 nm, while the single-photon fluorescent emission spectra showed obvious fluorescent effect.

scholarly journals Silane Treatment as an Effective Way of Improving the Reinforcing Activity of Carbon Nanofibers in Nitrile Rubber Composites

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3481
Author(s):  
Bolesław Szadkowski ◽  
Anna Marzec ◽  
Przemysław Rybiński
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanofibers ◽  
Ethanol Solution ◽  
Butadiene Rubber ◽  
Silane Treatment ◽  
Silane Coupling Agents ◽  
Sem Images ◽  
Silane Modification ◽  
Direct Incorporation

Two different silane treatment methods were used to improve the reinforcing activity of carbon nanofibers (CNF) in acrylonitrile-butadiene rubber (NBR) composites. The first method was chemical silanization with [3-(2-aminoethylamino)propyl]trimethoxysilane (APTS) in ethanol solution, preceded by oxidation of the CNF with H2SO4/HNO3. The second method was direct incorporation of silanes during preparation of the composites (in-situ silanization). Three different silane coupling agents were used: [3-(2-aminoethylamino)propyl]trimethoxysilane, (3-mercaptopropyl)trimethoxysilane (MPTS), and 3-ureidopropyltrimethoxysilane (UPTS). The NBR composites were prepared in an internal laboratory mixer, with increasing concentrations of pure or modified CNF. The crosslink density and flammability of the NBR-filled composites were analyzed, as well as their rheological and mechanical properties. The electrical conductivity of the composites was measured to assess the formation of CNF networks in the elastomer matrix. The morphology of the CNF was assessed by scanning electron microscopy (SEM). Both the dispersion of the CNF in the NBR matrix and the polymer-filler interactions were improved following silane modification, as shown in SEM images and by the Payne Effect. The composites were also found to have enhanced moduli, tensile strength, hardness, damping, and electrical conductivity. Chemical treatment proved to be more effective at improving the reinforcing effect of CNF in the elastomer matrix than in-situ silanization. The results of this study demonstrate the great potential of both in-situ and chemical silanization for the preparation of reinforced polymer composites filled with CNF.

scholarly journals Biocompatibility Study of Electrospun Nanocomposite Membranes Based on Chitosan/Polyvinyl Alcohol/Oxidized Carbon Nano-Onions

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4753
Author(s):  
Jorge Iván Castro ◽  
Manuel N. Chaur ◽  
Carlos Humberto Valencia Llano ◽  
Mayra Eliana Valencia Zapata ◽  
José Herminsul Mina Hernandez ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Crystallinity Index ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Number Of Patients ◽  
Degradation Analysis ◽  
Electrospinning Method ◽  
Oxidized Carbon ◽  
Biocompatibility Study

In recent decades, the number of patients requiring biocompatible and resistant implants that differ from conventional alternatives dramatically increased. Among the most promising are the nanocomposites of biopolymers and nanomaterials, which pretend to combine the biocompatibility of biopolymers with the resistance of nanomaterials. However, few studies have focused on the in vivo study of the biocompatibility of these materials. The electrospinning process is a technique that produces continuous fibers through the action of an electric field imposed on a polymer solution. However, to date, there are no reports of chitosan (CS) and polyvinyl alcohol (PVA) electrospinning with carbon nano-onions (CNO) for in vivo implantations, which could generate a resistant and biocompatible material. In this work, we describe the synthesis by the electrospinning method of four different nanofibrous membranes of chitosan (CS)/(PVA)/oxidized carbon nano-onions (ox-CNO) and the subdermal implantations after 90 days in Wistar rats. The results of the morphology studies demonstrated that the electrospun nanofibers were continuous with narrow diameters (between 102.1 nm ± 12.9 nm and 147.8 nm ± 29.4 nm). The CS amount added was critical for the diameters used and the successful electrospinning procedure, while the ox-CNO amount did not affect the process. The crystallinity index was increased with the ox-CNO introduction (from 0.85% to 12.5%), demonstrating the reinforcing effect of the nanomaterial. Thermal degradation analysis also exhibited reinforcement effects according to the DSC and TGA analysis, with the higher ox-CNO content. The biocompatibility of the nanofibers was comparable with the porcine collagen, as evidenced by the subdermal implantations in biological models. In summary, all the nanofibers were reabsorbed without a severe immune response, indicating the usefulness of the electrospun nanocomposites in biomedical applications.

scholarly journals A new method for preparing excellent electrical conductivity carbon nanofibers from coal extraction residual

2021 ◽  
pp. 100109
Author(s):  
Wenyang Lu ◽  
Tongtong Wang ◽  
Xin He ◽  
Kaidi Sun ◽  
Zaixing Huang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanofibers ◽  
New Method ◽  
Coal Extraction

Electrical conductivity and hydrophobicity of graphene oxide-modified carbon nanofibers

2021 ◽  
pp. 138551
Author(s):  
He-Dong Huang ◽  
Zeyu Guo ◽  
Peng-yan Yang ◽  
Peng Chen ◽  
Jie Wu
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Carbon Nanofibers

scholarly journals Fast Dissolving Electrospun Nanofibers Fabricated from Jelly Fig Polysaccharide/Pullulan for Drug Delivery Applications

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 241
Author(s):  
Thangavel Ponrasu ◽  
Bei-Hsin Chen ◽  
Tzung-Han Chou ◽  
Jia-Jiuan Wu ◽  
Yu-Shen Cheng
Keyword(s):  
Drug Delivery ◽  
Water Vapor Permeability ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Xrd Analysis ◽  
Water Soluble ◽  
Vapor Permeability ◽  
Uv Spectrum ◽  
Sem Images ◽  
Triton X

The fast-dissolving drug delivery systems (FDDDSs) are developed as nanofibers using food-grade water-soluble hydrophilic biopolymers that can disintegrate fast in the oral cavity and deliver drugs. Jelly fig polysaccharide (JFP) and pullulan were blended to prepare fast-dissolving nanofiber by electrospinning. The continuous and uniform nanofibers were produced from the solution of 1% (w/w) JFP, 12% (w/w) pullulan, and 1 wt% Triton X-305. The SEM images confirmed that the prepared nanofibers exhibited uniform morphology with an average diameter of 144 ± 19 nm. The inclusion of JFP in pullulan was confirmed by TGA and FTIR studies. XRD analysis revealed that the increased crystallinity of JFP/pullulan nanofiber was observed due to the formation of intermolecular hydrogen bonds. The tensile strength and water vapor permeability of the JFP/pullulan nanofiber membrane were also enhanced considerably compared to pullulan nanofiber. The JFP/pullulan nanofibers loaded with hydrophobic model drugs like ampicillin and dexamethasone were rapidly dissolved in water within 60 s and release the encapsulants dispersive into the surrounding. The antibacterial activity, fast disintegration properties of the JFP/pullulan nanofiber were also confirmed by the zone of inhibition and UV spectrum studies. Hence, JFP/pullulan nanofibers could be a promising carrier to encapsulate hydrophobic drugs for fast-dissolving/disintegrating delivery applications.

Sign in / Sign up

Export Citation Format

Share Document