Characterization and modeling of the effective electrical conductivity of a carbon nanotube/polymer composite containing chain-structured ferromagnetic particles

2016 ◽  
Vol 51 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Sung-Hwan Jang ◽  
Huiming Yin
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Chain Model ◽  
Sensing Applications ◽  
Effective Electrical Conductivity ◽  
Multi Walled Carbon Nanotube ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Ferromagnetic Particles

The effective electrical conductivity of multi-walled carbon nanotube/polydimethylsiloxane composites with chain-structured ferromagnetic particles has been investigated by experiments and micromechanics-based modeling. A multi-scale modeling approach is used to consider different size of fillers of multi-walled carbon nanotubes and particles as well as their distribution in the matrix. At nanoscale, for multi-walled carbon nanotube/polydimethylsiloxane composite, eight-chain model and influence of waviness of multi-walled carbon nanotube are considered to render an effective electrical conductivity. At microscale, ferromagnetic particles are aligned in the matrix made of the multi-walled carbon nanotube/polydimethylsiloxane composite, and an analytical model is established based on representative volume element. The influence of inter-particle distance is evaluated. The proposed analytic results agree well with the experimental results. The present model can be a useful tool for design and analysis of these composites for sensing applications considering their percolation threshold and overall electrical conductivity.

Fabrication and characterization of MWCNT/natural Azerbaijani bentonite electroconductive ceramic composites

2019 ◽  
Vol 53 (26-27) ◽  
pp. 3909-3923 ◽  
Author(s):  
Asgar Huseynov ◽  
Aydin Israfilov ◽  
Samira Mammadova ◽  
Sevda Abdullayeva ◽  
Sergey Sokolov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Bentonite Clays ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes have been synthesized by Aerosol-Chemical Vapor Deposition method. Carbon nanotubes firstly have been used as filler in affordable and prevalent natural Azerbaijani bentonite clays for fabrication electroconductive ceramic composites. In this paper, multi-walled carbon nanotubes/natural Azerbaijani bentonite ceramic composites were prepared by two-factor mechanical method and followed by calcination at 1050℃ in an inert atmosphere. The ceramic composites were characterized by scanning electron microscope, atomic force microscope, X-ray diffraction and thermogravimetric-differential-thermal analysis. X-ray diffraction analysis confirmed the presence of two principal components – multi-walled carbon nanotube and bentonite in composites. From the thermogravimetric-differential-thermal data, it was revealed that multi-walled carbon nanotube/ bentonite ceramic composites demonstrate thermo-oxidative stability up to 580–640℃. Scanning electron microscope images demonstrated a sufficiently high dispersibility of carbon nanotubes and satisfactory homogeneity in the composites. Experimental results demonstrated that by increasing the mass fraction of multi-walled carbon nanotubes from 1% to 8% in multi-walled carbon nanotube/bentonite ceramic composites, the electrical conductivity enhances substantially. The enhancement of electrical conductivity of the composites explained the mass fraction of multi-walled carbon nanotubes, as well as the uniform dispersion of multi-walled carbon nanotubes in the bentonite clays. Compared with other 8% multi-walled carbon nanotubes/bentonite ceramic composites, the electrical conductivity of heptane-multi-walled carbon nanotube/Gobu bentonite (σ = 397 S·m−1) and heptane-multi-walled carbon nanotubes/Atyali (σ = 305 S·m−1) composites is 2–5 times higher than the conductivity of composites obtained with cyclohexane carbon nanotubes- cyclohexane-multi-walled carbon nanotube/Atyali (σ = 78 S·m−1), cyclohexane-multi-walled carbon nanotube/Gobu (σ = 111,5 S·m−1). These results can be explained with the structure, the number of layers, purity and diameter distribution, as well as the type and amount of defects in internal and external layers of Hep-multi-walled carbon nanotubes which cause better dispersion in bentonite clays. Due to the high conductivity and high temperature stability, these composites can be used as promising material for fabrication heating elements, electrodes, substrates for microelectronic devices, etc.

Effects of incorporation of polyester on the electrical resistivity of polycarbonate/multi-walled carbon nanotube nanocomposite

2018 ◽  
Vol 53 (10) ◽  
pp. 1291-1298 ◽  
Author(s):  
Hee Young Lee ◽  
Heidy Cruz ◽  
Younggon Son
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Polybutylene Terephthalate ◽  
Melt Mixing ◽  
Crystal Polymer ◽  
Multi Walled Carbon Nanotube ◽  
Random Block ◽  
Multi Walled Carbon Nanotubes ◽  
Injection Molded ◽  
Walled Carbon Nanotubes

In this work, we present the effect of incorporation of polyester on the electrical properties of injection-molded polycarbonate/multi-walled carbon nanotube nanocomposites. The study was conducted by melt-mixing polycarbonate, multi-walled carbon nanotube, and three types of polyesters: polybutylene terephthalate, polyethylene terephthalate, and liquid crystal polymer. It was found that the volume resistivities of injection-molded composites containing 2 phr polyester significantly decreased because of the transesterification reaction between the polycarbonate and polyester. The resulting polycarbonate-polyester random block copolymer kept the conductive networks intact because of the preferential affinity of multi-walled carbon nanotubes with polyester. This study showed that incorporating polyester with polycarbonate–multi-walled carbon nanotube increases the electrical conductivity of injection-molded polycarbonate/multi-walled carbon nanotube nanocomposites to a great extent.

Highly sensitive compression sensors using three-dimensional printed polydimethylsiloxane/carbon nanotube nanocomposites

2019 ◽  
Vol 30 (8) ◽  
pp. 1216-1224 ◽  
Author(s):  
Mohammad Charara ◽  
Mohammad Abshirini ◽  
Mrinal C Saha ◽  
M Cengiz Altan ◽  
Yingtao Liu
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Carbon Nanotube ◽  
Scanning Electron Microscope ◽  
Three Dimensional ◽  
Multi Walled Carbon Nanotube ◽  
Highly Sensitive ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Scanning Electron

This article presents three-dimensional printed and highly sensitive polydimethylsiloxane/multi-walled carbon nanotube sensors for compressive strain and pressure measurements. An electrically conductive polydimethylsiloxane/multi-walled carbon nanotube nanocomposite is developed to three-dimensional print compression sensors in a freestanding and layer-by-layer manner. The dispersion of multi-walled carbon nanotubes in polydimethylsiloxane allows the uncured nanocomposite to stand freely without any support throughout the printing process. The cross section of the compression sensors is examined under scanning electron microscope to identify the microstructure of nanocomposites, revealing good dispersion of multi-walled carbon nanotubes within the polydimethylsiloxane matrix. The sensor’s sensitivity was characterized under cyclic compression loading at various max strains, showing an especially high sensitivity at lower strains. The sensing capability of the three-dimensional printed nanocomposites shows minimum variation at various applied strain rates, indicating its versatile potential in a wide range of applications. Cyclic tests under compressive loading for over 8 h demonstrate that the long-term sensing performance is consistent. Finally, in situ micromechanical compressive tests under scanning electron microscope validated the sensor’s piezoresistive mechanism, showing the rearrangement, reorientation, and bending of the multi-walled carbon nanotubes under compressive loads, were the main reasons that lead to the piezoresistive sensing capabilities in the three-dimensional printed nanocomposites.

Self-assembly fabrication of a graphene/multi-walled carbon nanotube hybrid material for suppressing potential heat radiation and toxic effluent

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103365-103372 ◽  
Author(s):  
Lei Liu ◽  
Dong Wang ◽  
Yuan Hu
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Hybrid Material ◽  
Self Assembly ◽  
Heat Radiation ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Negative graphene oxide was combined with positive chitosan-modified multi-walled carbon nanotubes in aqueous solution and then thermally reduced to fabricate a multi-walled carbon nanotube/graphene (MWCNT/G) hybrid material.

The “click-on-tube” approach for the production of efficient drug carriers based on oxidized multi-walled carbon nanotubes

2016 ◽  
Vol 4 (21) ◽  
pp. 3823-3831 ◽  
Author(s):  
Stefano Fedeli ◽  
Alberto Brandi ◽  
Lorenzo Venturini ◽  
Paola Chiarugi ◽  
Elisa Giannoni ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Carbon Nanotube ◽  
Drug Delivery System ◽  
Delivery System ◽  
Drug Carriers ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Straightforward Approach

An efficient drug delivery system through a straightforward approach to multi-walled carbon nanotube decoration.

scholarly journals Coordination matrix/signal amplifier strategy for simultaneous electrochemical determination of cadmium(ii), lead(ii), copper(ii), and mercury(ii) ions based on polyfurfural film/multi-walled carbon nanotube modified electrode

RSC Advances ◽  
2017 ◽  
Vol 7 (45) ◽  
pp. 28556-28563 ◽  
Author(s):  
Jianzhi Huang ◽  
Silan Bai ◽  
Guoqing Yue ◽  
Wenxue Cheng ◽  
Lishi Wang
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Modified Electrode ◽  
Electrochemical Determination ◽  
Multi Walled Carbon Nanotube ◽  
Signal Amplifier ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Coordination matrix/signal amplifier strategy for simultaneous electrochemical determination of cadmium(ii), lead(ii), copper(ii) and mercury(ii) ions based on polyfurfural film/multi-walled carbon nanotubes modified electrode.

Multi-walled carbon nanotubes composited with nanomagnetite for anodes in lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7237-7244 ◽  
Author(s):  
Xiaoyu Li ◽  
Hongbo Gu ◽  
Jiurong Liu ◽  
Huige Wei ◽  
Song Qiu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Lithium Ion ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
20 Nm ◽  
Walled Carbon Nanotubes ◽  
Annealing Method

The multi-walled carbon nanotube (MWNT) nanocomposites with homogenously anchored nanomagnetite of 10–20 nm prepared by a hydrothermal-annealing method exhibit excellent performances as anode materials for lithium ion batteries.

scholarly journals Effect of diatomaceous earth on thermoelectric elements using multi-walled carbon nanotubes

2018 ◽  
Vol 3 (4) ◽  
pp. 5-8
Author(s):  
Keyword(s):  
Power Generation ◽  
Carbon Nanotube ◽  
Diatomaceous Earth ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Thermoelectric Devices ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Generation Capacity ◽  
Walled Carbon Nanotubes

Thermoelectric power generation is one of the expected new renewable energy in the future. However, the power generation capacity of thermoelectric devices is poor. In this research, we focused on utilizing diatomaceous earth to improve the performance of thermoelectric devices because it has low thermal conductivity. Our thermoelectric devices based on multi-walled carbon nanotube and diatomaceous earth have improved the open-circuit voltage about 30% compared with the conventional thermoelectric devices based on multi-walled carbon nanotube only.

Electrochemical enantiorecognition of tryptophan enantiomers based on a multi-walled carbon nanotube–hydroxyethyl chitosan composite film

2017 ◽  
Vol 9 (35) ◽  
pp. 5149-5155 ◽  
Author(s):  
Zhenliang Li ◽  
Zunli Mo ◽  
Ruibin Guo ◽  
Shujuan Meng ◽  
Ruijuan Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Electrochemical Sensor ◽  
Tryptophan Enantiomers ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Chitosan Composite

A novel chiral electrochemical sensor based on hydroxyethyl chitosan (HECS) covalently binding with the carboxylic multi-walled carbon nanotubes (MWCNT–COOH) was fabricated for discrimination of tryptophan (Trp) enantiomers.

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