Abhishek Kumar Arya; Bhanu Pratap Singh; Jeevan Jyoti; Santwana Pati; S.R. Dhakate
Abstract
Vertically aligned carbon nanotube (VACNT) arrays are widely studied because of their immense potential in a wide range of applications. In order to tailor the properties of carbon nanotubes (CNTs) for a particular application, vertical alignment in the form of sheet is a major breakthrough. Herein ...
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Vertically aligned carbon nanotube (VACNT) arrays are widely studied because of their immense potential in a wide range of applications. In order to tailor the properties of carbon nanotubes (CNTs) for a particular application, vertical alignment in the form of sheet is a major breakthrough. Herein we report an economic and effective strategy developed to synthesise aligned multiwalled carbon nanotube sheets using Al powder as buffer layer. We achieved easy growth of VACNTs sheets using toluene/ferrocene solution in a two-zone furnace by chemical vapor deposition method. First zone was set at temperature 200 ° C and other zone was set at temperature 750 ° C for the synthesis of VACNTs. Almost 500 µm long VACNT sheet was grown. We observed the significant growth of VACNT sheet on Al powdered quartz substrate in nitrogen medium. Uniform length of CNTs was maintained all over the sheet and additionally nitrogen is an economical alternative rather than other inert gases.
Pradeep Sambyal; Avanish Pratap Singh; Meenakshi Verma; Ankit Gupta; Bhanu Pratap Singh; S.K. Dhawan
Abstract
Utilization of flyash which is produced at large scale in coal based thermal power plant is a challenge. In this regard, our investigation provides distinctive way of utilizing flyash for designing and preparing high-performance EMI shielding materials. Herein, we report synthesis and characterization ...
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Utilization of flyash which is produced at large scale in coal based thermal power plant is a challenge. In this regard, our investigation provides distinctive way of utilizing flyash for designing and preparing high-performance EMI shielding materials. Herein, we report synthesis and characterization of multiwalled carbon nanotubes (MWCNT) based multiphase composites. The multiphase composites were synthesized by in-situ co-precipitation with conductive filler (MWCNT) and magnetic filler (Ferrofluid). Scanning electron microscopy results confirm the presence of fly ash particles covered with Ferrofluid nanoparticles along with MWCNTs. Multiphase composites show total shielding effectiveness of 48 dB (>99.998 % attenuation) in the Ku-band (12.4–18 GHz) frequency range. The electromagnetic attributes, dielectric and permeability parameters have been calculated from the measured scattering parameters (S11, S22, S12, S21) using the Nicolson–Ross–Weir algorithm. The synthesized multiphase composites were characterized using XRD, FTIR, VSM and SEM. The results suggested that the MPC composites showed great potential as a radar absorbing material.
Bhanu Pratap Singh; Veena Choudhary; Satish Teotia; Tejendra Kumar Gupta; Vidya Nand Singh; Sanjay Rangnath Dhakate; Rakesh Behari Mathur
Abstract
Dispersion of multiwalled carbon nanotubes (MWCNTs) into epoxy resin is a challenging task for the process to be viable on industrial scale. Herein, amine functionalized MWCNTs (Am-MWCNTs) were reinforced into epoxy resin using industrially viable, fast, efficient, solvent free, high speed homogenizer ...
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Dispersion of multiwalled carbon nanotubes (MWCNTs) into epoxy resin is a challenging task for the process to be viable on industrial scale. Herein, amine functionalized MWCNTs (Am-MWCNTs) were reinforced into epoxy resin using industrially viable, fast, efficient, solvent free, high speed homogenizer dispersion technique. Am-MWCNTs ranging from 0.1 to 0.75% by w/w were loaded in epoxy and the effects of loading of Am-MWCNTs on mechanical properties of epoxy composites are investigated. The flexural strength of Am-MWCNTs based epoxy composites reached up to 163 MPa for 0.5 wt% MWCNTs loaded sample compared to 95 MPa for pure cured epoxy sample; an overall improvement of 72% in the flexural strength. In addition to this, the flexural modulus value reached to 3795 MPa for 0.75 wt% Am-MWCNTs loaded sample from 2250 MPa for pure epoxy sample, an improvement of 69%. The enhancement in the mechanical properties was correlated with the dynamic scanning calorimeter results, TEM and SEM images of fractured surface. The substantial improvement in the mechanical properties of the epoxy resin at such low CNT loading can open a venue for the preparation of structurally strong structures for aerospace, defence, automobile and sports industries.