Synthesis of carbon nanotube fiber via direct spinning for conducting wires

The commercial conducting materials (Cu, Ag, Al etc.) have achieved their saturation due to their high density andJoule’s heating effect in terms of efficiency. In this outlook, carbon nanotubes (CNTs) are the most versatile, light weightand high electrically conducting material for advance generation. But it is difficult to weave them for commercialization.For the growth of 3-D CNT assemblies such as CNT fiber, CNT sheet, CNT rope and CNT ribbon, direct spinning is themost suitable technique because of its simplicity for continuous growth of CNT fiber. In the present work, different growthparameters were analysed for the growth of CNT fibers. The growth of CNT fibres has been carried out through directspinning of as-synthesised CNT aerogel. CNT fibers were grown successfully via optimizing different processingparameters like temperature, pressure and argon to hydrogen ratio. The morphology of as-spun fibers was investigated viamicroscopic techniques such as optical microscopy, SEM and TEM. Moreover, the defects and metallicity of as-spun fibershave been analysed using Raman spectroscopy. The change in resistance with change in temperature was also measured forquality of as-made CNT fiber which shows metallic behavior as CNT fiber has positive temperature coefficient. Above151K, conducting CNTs are dominating and below this temperature, semiconducting CNTs are showing their nature inR v/s T curve. Furthermore, the measured electrical conductivity of as-made fiber is 3.9×10³ S/m. These as-spun metallicfibers can outperform the currently used Cu wire. Hence, as-synthesized conductive CNT fibers have great potentialas conducting wires

Synthesis of carbon nanotube fiber via direct spinning for conducting wires

1112-1117The commercial conducting materials (Cu, Ag, Al etc.) have achieved their saturation due to their high density and Joule’s heating effect in terms of efficiency. In this outlook, carbon nanotubes (CNTs) are the most versatile, light weight and high electrically conducting material for advance generation. But it is difficult to weave them for commercialization. For the growth of 3-D CNT assemblies such as CNT fiber, CNT sheet, CNT rope and CNT ribbon, direct spinning is the most suitable technique because of its simplicity for continuous growth of CNT fiber. In the present work, different growth parameters were analysed for the growth of CNT fibers. The growth of CNT fibres has been carried out through direct spinning of as-synthesised CNT aerogel. CNT fibers were grown successfully via optimizing different processing parameters like temperature, pressure and argon to hydrogen ratio. The morphology of as-spun fibers was investigated via microscopic techniques such as optical microscopy, SEM and TEM. Moreover, the defects and metallicity of as-spun fibers have been analysed using Raman spectroscopy. The change in resistance with change in temperature was also measured for quality of as-made CNT fiber which shows metallic behavior as CNT fiber has positive temperature coefficient. Above 151K, conducting CNTs are dominating and below this temperature, semiconducting CNTs are showing their nature in R v/s T curve. Furthermore, the measured electrical conductivity of as-made fiber is 3.9×10³ S/m. These as-spun metallic fibers can outperform the currently used Cu wire. Hence, as-synthesized conductive CNT fibers have great potential as conducting wires

Synthesis of high surface area activated carbon from eucalyptus bark for the removal of methylene blue

In present study, high surface area (1852m2g−1) activated carbon was synthesized by single step thermo chemical activation of agro-waste lignocellulose biomass (eucalyptus bark).The synthesized activated carbon has been characterized using scanning electron microscopy, energy-dispersive-X-ray spectroscopy and BET surface area analyser. The eucalyptus bark derived activated carbon (EBAC) was used to remove methylene blue (MB) from waste water. The pH, contact time and concentration of dye were optimized and it was found that at pH of 5.5-6.5 at the room temperature, maximum removal of dye was observed. The obtained time data follows the pseudo second order kinetics. The effect of concentration study was carried out with varying concentration at optimized pH and time. The maximum adsorption capacity is obtained to be 7.15 mg/g. To understand the adsorption process, the Dubinin–Radushkevich (D–R) isotherm and Freundlich isotherm were used for fitting of equilibrium data. The fitted data follows D-R isotherm which reveals the physisorption process during adsorption of dye

Synthesis of carbon nanotube fiber via direct spinning for conducting wires

1112-1117The commercial conducting materials (Cu, Ag, Al etc.) have achieved their saturation due to their high density and Joule’s heating effect in terms of efficiency. In this outlook, carbon nanotubes (CNTs) are the most versatile, light weight and high electrically conducting material for advance generation. But it is difficult to weave them for commercialization. For the growth of 3-D CNT assemblies such as CNT fiber, CNT sheet, CNT rope and CNT ribbon, direct spinning is the most suitable technique because of its simplicity for continuous growth of CNT fiber. In the present work, different growth parameters were analysed for the growth of CNT fibers. The growth of CNT fibres has been carried out through direct spinning of as-synthesised CNT aerogel. CNT fibers were grown successfully via optimizing different processing parameters like temperature, pressure and argon to hydrogen ratio. The morphology of as-spun fibers was investigated via microscopic techniques such as optical microscopy, SEM and TEM. Moreover, the defects and metallicity of as-spun fibers have been analysed using Raman spectroscopy. The change in resistance with change in temperature was also measured for quality of as-made CNT fiber which shows metallic behavior as CNT fiber has positive temperature coefficient. Above 151K, conducting CNTs are dominating and below this temperature, semiconducting CNTs are showing their nature in R v/s T curve. Furthermore, the measured electrical conductivity of as-made fiber is 3.9×10³ S/m. These as-spun metallic fibers can outperform the currently used Cu wire. Hence, as-synthesized conductive CNT fibers have great potential as conducting wires

Tracking the Nation: Material Sites of Trans-cultural Mobility in China Men

1059-1066In present study, high surface area (1852m2g−1) activated carbon was synthesized by single step thermo chemical activation of agro-waste lignocellulose biomass (eucalyptus bark).The synthesized activated carbon has been characterized using scanning electron microscopy, energy-dispersive-X-ray spectroscopy and BET surface area analyser. The eucalyptus bark derived activated carbon (EBAC) was used to remove methylene blue (MB) from waste water. The pH, contact time and concentration of dye were optimized and it was found that at pH of 5.5-6.5 at the room temperature, maximum removal of dye was observed. The obtained time data follows the pseudo second order kinetics. The effect of concentration study was carried out with varying concentration at optimized pH and time. The maximum adsorption capacity is obtained to be 7.15 mg/g. To understand the adsorption process, the Dubinin–Radushkevich (D–R) isotherm and Freundlich isotherm were used for fitting of equilibrium data. The fitted data follows D-R isotherm which reveals the physisorption process during adsorption of dye