PDF Publication Title:
Text from PDF Page: 004
Polymer Bulletin Materials and methods Materials For the preparation of carbon nanofibers using the electrospinning process, poly- acrylonitrile, supplied by Radici company in powder form, was used as the polymer, and dimethylformamide, with concentration ≥99%, supplied by the Mallinckrodt Chemicals Company, was used as the solvent (DMF). In order to manufacture the epoxy/carbon nanofiber composite was used the epoxy resin from Cytec brand. Electrospinning processing The solution of polyacrylonitrile in dimethylformamide was prepared dissolving 6w/w% of PAN in DMF for 3 h at room temperature and under constant agitation. The electrospinning system used, to produce PAN mats, consists of a high volt- age power supply of (Faísca), a cylinder grounded collector rotated by a gear motor (Tekno MRT910 model) and a controller (Tekno CVET2002), a glass syringe with 20 mL t with stainless needle Hamilton type. To control the humidity during this process were used a dehumidifier (Thermomatic, Desidrat Plus) and thermohygrom- eter (Minipa, MT-241). To quantify the cylinder speed was used a tachometer (Min- ipa, MDT2238A). The parameters used in the processing of PAN mats by electrospinning were: a stainless steel needle of 10 mm long and 1.5 mm diameter, a cylinder rotation around 24 rpm, applied voltage around 21 kV, working distance of 10 cm, humidity range of 35–43%, room temperature range of 29.4–33.4 °C and collection time of 12 h. These parameters were obtained according to the [14–16]. The equipment used in the production of the mats does not have control of solution2flow. The solution flow exit of the needle tip is controlled by gravity action (9.8 m/s ). Carbonization of PAN mats The PAN fibers obtained from the electrospinning process were carbonized in an electric furnace with cylindrical chamber of quartz, under constant flow of nitrogen. During this step, it was used the heating rate of 1 °C/min, starting from ambient temperature up to 1000 °C, remaining 1 h at the maximum temperature. A stainless steel screen 304 of 100 mesh, diameter of wire of 0.10-mm and 0.154-mm opening was used to wrap and protect the nanofibers to avoid that they do not flew during the carbonization process. Fourier transform infrared spectroscopy (FTIR) In order to analyze the modifications in the chemical composition of the surface of the electrospun PAN samples before and after their carbonization, a PerkinElmer Fourier transform infrared spectroscopy (FTIR), model 100, was used. The spec- trometer is equipped with a universal ATR accessory using a diamond crystal as an 13PDF Image | Carbon nanofibers obtained from electrospinning process
PDF Search Title:
Carbon nanofibers obtained from electrospinning processOriginal File Name Searched:
Artigoelectrospinnigprocess2019.pdfDIY PDF Search: Google It | Yahoo | Bing
Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)