Dispersion of Multiwall Carbon Nanotubes in Organic Solvents through Hydrothermal Supercritical Condition

Jagadish, K.; Srikantaswamy, S.; Byrappa, K.; Shruthi, L.; Abhilash, M. R.

doi:10.1155/2015/381275

Cited by 27 publications

(11 citation statements)

References 26 publications

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“…Two CNT/[bisC 8 ImC 10 ][C 12 H 25 OSO 3 ] 2 mixtures with different amounts of CNTs (0.5% w/w and 0.05% w/w) were prepared for dielectric measurements by consecutive dilution of an initial sample containing 2% CNTs. The starting sample was prepared by dissolving first the bisimidazolium salt (0.2 g) in a minimum volume of dichloromethane (1 mL) followed by addition of CNT (0.004 g) [ 58 ]. The resulting mixture was sonicated for at least 60 min followed by the removal of the solvent, drying in vacuum and cooling at 0 °C.…”

Section: Methodsmentioning

confidence: 99%

Dielectric properties of a bisimidazolium salt with dodecyl sulfate anion doped with carbon nanotubes

Maximean

Cı̂rcu

Ganea

2018

Beilstein J. Nanotechnol.

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A new bisimidazolium salt with dodecyl sulfate as counterion has been designed and prepared. This salt shows a SmA phase that is stable at room temperature. The new ionic liquid crystal (ILC) was characterized by 1H NMR, 13C NMR and IR spectroscopy. Its liquid crystalline properties were analyzed by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and powder X-ray diffraction (XRD) studies. The dielectric spectra of the ILC doped with different concentrations of carbon nanotubes (CNT) were recorded over a wide frequency and temperature range of 10−1 to 107 Hz and 293–338 K, respectively. The values of the activation energy were found in the range of 0.46–0.61 eV; the characteristic time was obtained by fitting the spectra of the dielectric loss with the Havriliak–Negami functions. As a result of doping the ILC with CNT, the electric conductivity increases significantly. Ionic conductivity is dominant and it was indirectly observed through the electrode polarization (EP) effect. The very high dielectric permittivity values and the decrease of the electric conductivity at low frequencies confirm the presence of EP.

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Section: Methodsmentioning

confidence: 99%

Dielectric properties of a bisimidazolium salt with dodecyl sulfate anion doped with carbon nanotubes

Maximean

Cı̂rcu

Ganea

2018

Beilstein J. Nanotechnol.

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“…PZT was used as a model high-dielectric ceramic filler and its content was fixed at 0-5-10-20-30 vol% and MWCNT was employed as the conductive filler with 0-1 vol% content. Dispersion of MWCNTs is a challenging assignment, due to their high aspect ratio and strong van der Waals bonds [54]. Poor dispersion results in bundles of entangled MWCNT.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Polyurethane/Lead Zirconate Titanate/Carbon Nanotube Composites with Very High Dielectric Permittivity and Low Dielectric Loss

2020

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Ternary composites of flexible thermoplastic polyurethane (TPU), lead zirconate titanate (PZT), and multiwalled carbon nanotubes (MWCNTs) with very high dielectric permittivity (εr) and low dielectric loss (tan δ) are reported. To assess the evolution of dielectric properties with the interactions between conductive and dielectric fillers, composites were designed with a range of content for PZT (0–30 vol%) and MWCNT (0–1 vol%). The microstructure was composed of PZT-rich and segregated MWCNT-rich regions, which could effectively prevent the formation of macroscopic MWCNT conductive networks and thus reduce the high ohmic loss. Therefore, εr increased by a maximum of tenfold, reaching up to 166 by the addition of up to 1 vol% MWCNT to TPU/PZT. More importantly, tan δ remained relatively unchanged at 0.06–0.08, a similar range to that of pure TPU. εr/tan δ ratio reached 2870 at TPU/30 vol% PZT/0.5 vol% MWCNT, exceeding most of the reported values. This work demonstrates the potential of three-phase polymer/conductive filler/dielectric filler composites for efficient charge storage applications.

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“…Finally, the filtrate was dried in an oven (Figure S1b) and sonicated for 5 min with 60 mL of DI water to make the F-MWCNT solution. As shown in Figure S1c, our F-MWCNTs were uniformly dispersed in DI water because they have better dispersion than MWCNTs in water [34]. The FTIR spectra (Figure 1), showed that there were O-H, C=O, and C-O vibrations at 3372.11, 1642.21, and 1226.28 cm −1 , respectively, which clearly indicated that carboxylic and hydroxyl groups had been successfully attached to the surface of the MWCNTs.…”

Section: Procedures 231 Preparation Of Functionalized Cntsmentioning

confidence: 83%

Physical Surface Modification of Carbon-Nanotube/Polydimethylsiloxane Composite Electrodes for High-Sensitivity DNA Detection

2021

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The chemical modification of electrode surfaces has attracted significant attention for lowering the limit of detection or for improving the recognition of biomolecules; however, the chemical processes are complex, dangerous, and difficult to control. Therefore, instead of the chemical process, we physically modified the surface of carbon-nanotube/polydimethylsiloxane composite electrodes by dip coating them with functionalized multi-walled carbon nanotubes (F-MWCNTs). These electrodes are used as working electrodes in electrochemistry, where they act as a recognition layer for sequence-specific DNA sensing through π–π interactions. The F-MWCNT-modified electrodes showed a limit of detection of 19.9 fM, which was 1250 times lower than that of pristine carbon/polydimethylsiloxane electrodes in a previous study, with a broad linear range of 1–1000 pM. The physically modified electrode was very stable during the electrode regeneration process after DNA detection. Our method paves the way for utilizing physical modification to significantly lower the limit of detection of a biosensor system as an alternative to chemical processes.

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Dispersion of Multiwall Carbon Nanotubes in Organic Solvents through Hydrothermal Supercritical Condition

Cited by 27 publications

References 26 publications

Dielectric properties of a bisimidazolium salt with dodecyl sulfate anion doped with carbon nanotubes

Dielectric properties of a bisimidazolium salt with dodecyl sulfate anion doped with carbon nanotubes

Thermoplastic Polyurethane/Lead Zirconate Titanate/Carbon Nanotube Composites with Very High Dielectric Permittivity and Low Dielectric Loss

Physical Surface Modification of Carbon-Nanotube/Polydimethylsiloxane Composite Electrodes for High-Sensitivity DNA Detection

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