scholarly journals Synthesis of Metal Oxide Decorated Polycarboxyphenyl Polymer-Grafted Multiwalled Carbon Nanotube Composites by a Chemical Grafting Approach for Supercapacitor Application

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Do-Yeon Kang ◽  
Pashupati Pokharel ◽  
Yeong-Seok Kim ◽  
Sunwoong Choi ◽  
Seong-Ho Choi
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotube ◽  
Metal Oxide ◽  
Specific Capacitance ◽  
Metal Oxide Nanoparticles ◽  
Morphological Characteristics ◽  
Multiwalled Carbon Nanotube ◽  
Oxide Nanoparticles ◽  
Multiwalled Carbon ◽  
Scan Rate

We present grafting of polycarboxyphenyl polymer on the surface of multiwalled carbon nanotube (MWCNT) via a free radical polymerization and subsequent anchoring of the metal oxide nanoparticles for the evaluation of their potential applicability to supercapacitor electrodes. Here, metal oxide nanoparticles, Fe3O4and Sm2O3, were created after the oxidation of metal precursors Sm(NO3)3and FeCl2, respectively, and attached on the surface of polycarboxyphenyl-grafted MWCNT (P-CNT) in aqueous medium. This approach shows a potential for enhancing the dispersion of Fe3O4and Sm2O3nanoparticles on the wall of P-CNT. The structure and morphological characteristics of the purified MWCNT, P-CNT, and metal oxide-anchored polycarboxyphenyl-grafted MWCNT (MP-CNT) nanocomposites were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The electrochemical performance of the purified MWCNT electrode, P-CNT electrode, and MP-CNT electrodes was tested by cyclic voltammetry (CV) and galvanostatic charge discharge in a 1.0 M H2SO4aqueous electrolyte. The results showed that the specific capacitance of the purified MWCNT was 45.3 F/g at the scan rate of 5 mV/s and increased to 54.1 F/g after the modification with polycarboxyphenyl polymer. Further modification of P-CNT with Sm2O3and Fe3O4improved the specific capacitance of 65.84 F/g and 173.38 F/g, respectively, at the same scan rate.

scholarly journals 3D Printed Thermoelectric Polyurethane/Multiwalled Carbon Nanotube Nanocomposites: A Novel Approach towards the Fabrication of Flexible and Stretchable Organic Thermoelectrics

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2879 ◽  
Author(s):  
Lazaros Tzounis ◽  
Markos Petousis ◽  
Sotirios Grammatikos ◽  
Nectarios Vidakis
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Seebeck Coefficient ◽  
Morphological Characteristics ◽  
Multiwalled Carbon Nanotube ◽  
Melt Mixing ◽  
Multiwalled Carbon ◽  
Fused Deposition ◽  
3D Printed

Three-dimensional (3D) printing of thermoelectric polymer nanocomposites is reported for the first time employing flexible, stretchable and electrically conductive 3D printable thermoplastic polyurethane (TPU)/multiwalled carbon nanotube (MWCNT) filaments. TPU/MWCNT conductive polymer composites (CPC) have been initially developed employing melt-mixing and extrusion processes. TPU pellets and two different types of MWCNTs, namely the NC-7000 MWCNTs (NC-MWCNT) and Long MWCNTs (L-MWCNT) were used to manufacture TPU/MWCNT nanocomposite filaments with 1.0, 2.5 and 5.0 wt.%. 3D printed thermoelectric TPU/MWCNT nanocomposites were fabricated through a fused deposition modelling (FDM) process. Raman and scanning electron microscopy (SEM) revealed the graphitic nature and morphological characteristics of CNTs. SEM and transmission electron microscopy (TEM) exhibited an excellent CNT nanodispersion in the TPU matrix. Tensile tests showed no significant deterioration of the moduli and strengths for the 3D printed samples compared to the nanocomposites prepared by compression moulding, indicating an excellent interlayer adhesion and mechanical performance of the 3D printed nanocomposites. Electrical and thermoelectric investigations showed that L-MWCNT exhibits 19.8 ± 0.2 µV/K Seebeck coefficient (S) and 8.4 × 103 S/m electrical conductivity (σ), while TPU/L-MWCNT CPCs at 5.0 wt.% exhibited the highest thermoelectric performance (σ = 133.1 S/m, S = 19.8 ± 0.2 µV/K and PF = 0.04 μW/mK2) among TPU/CNT CPCs in the literature. All 3D printed samples exhibited an anisotropic electrical conductivity and the same Seebeck coefficient in the through- and cross-layer printing directions. TPU/MWCNT could act as excellent organic thermoelectric material towards 3D printed thermoelectric generators (TEGs) for potential large-scale energy harvesting applications.

Buckypaper/DYAD/Buckypaper and Buckypaper/DYAD/ (polyaniline/multiwalled carbon nanotube) composite sensors: Preparation and damping properties characterization

2017 ◽  
Vol 52 (11) ◽  
pp. 1457-1464
Author(s):  
Weiwei Lin ◽  
Yonatan Rotenberg ◽  
Hadi Fekrmandi ◽  
Cesar Levy
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotube ◽  
Damping Ratio ◽  
Multiwalled Carbon Nanotube ◽  
Layer By Layer ◽  
Test Results ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Nanotube Composites ◽  
Matrix Free

Buckypaper/DYAD/Buckypaper and Buckypaper/DYAD/(polyaniline/multiwalled carbon nanotube) composites films were made by frit compression method and layer-by-layer attachment method. Transmission electron microscopy and scanning electron microscopy were used to study the morphology properties of polyaniline/multiwalled carbon nanotube and the results showed that carbon nanotubes were well dispersed in the polymer matrix. Free vibration test results showed that the double-sided attachment of the sensor had higher damping ratio values than single-sided attachment. Also, damping ratios were higher when the composite sensor was placed at the beam's clamped end. Furthermore, the Buckypaper/DYAD/(polyaniline/multiwalled carbon nanotube) combination exhibited higher damping ratios than the other cases tested. Thus, these samples have the potential of being simultaneously strain sensors and dampers.

scholarly journals Mixture Effects of Diesel Exhaust and Metal Oxide Nanoparticles in Human Lung A549 Cells

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1302 ◽  
Author(s):  
Zerboni ◽  
Bengalli ◽  
Baeri ◽  
Fiandra ◽  
Catelani ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Metal Oxide ◽  
Diesel Exhaust ◽  
Human Lung ◽  
Metal Oxide Nanoparticles ◽  
A549 Cells ◽  
Oxide Nanoparticles ◽  
Transmission Electron ◽  
Exhaust Particles

Airborne ultrafine particles (UFP) mainly derive from combustion sources (e.g., diesel exhaust particles—DEP), abrasion sources (non-exhaust particles) or from the unintentional release of engineered nanoparticles (e.g., metal oxide nanoparticles—NPs), determining human exposure to UFP mixtures. The aim of the present study was to analyse the combined in vitro effects of DEP and metal oxide NPs (ZnO, CuO) on human lung A549 cells. The mixtures and the relative single NPs (DEP, ZnO, CuO) were characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS) and inductively coupled plasma-optic emission spectroscopy (ICP-OES). Cells were exposed for different times (3–72 h) to mixtures of standard DEP at a subcytotoxic concentration and ZnO and CuO at increasing concentrations. At the end of the exposure, the cytotoxicity was assessed by 3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium Bromide (MTT) and clonogenic tests, the pro-inflammatory potential was evaluated by interleukin-8 (IL-8) release and the cell morphology was investigated by fluorescence and transmission electron microscopy. The obtained results suggest that the presence of DEP may introduce new physico-chemical interactions able to increase the cytotoxicity of ZnO and to reduce that of CuO NPs.

Synthesis of Nano-MnO2/CNTs Composite and Electrochemical Properties as Electrode Material for Supercapacitor

2012 ◽  
Vol 512-515 ◽  
pp. 1005-1008 ◽  
Author(s):  
Jian Wang ◽  
Jin Hai Liu ◽  
Xue Bo Zhao ◽  
Guo Lu Li ◽  
Bing Qing Wei
Keyword(s):  
Carbon Nanotube ◽  
Specific Capacitance ◽  
Manganese Oxides ◽  
Room Temperature ◽  
Aqueous Alcohol ◽  
Test Results ◽  
Multiwalled Carbon ◽  
Scan Rate ◽  
Swnt Film ◽  
Better Than

The manganese oxides (MnO2) with nanostructures was fabricated with non-aqueous alcohol and aqueous solution of potassium permanganate (KMnO4) at room temperature. The test results show that the nano-MnO2 well coated on the surface of carbon nanotube (CNT), while the specific capacitance of the composites with MnO2 deposited on singlewall carbon nanotube (SWNT) was better than coated on multiwalled carbon nanotube (MWNT). The specific capacitance of MnO2 coated on SWNT film can reach 769F/g at scan rate of 5mv/s in the first cycle.

Platinum-Ruthenium-Multiwalled Carbon Nanotube-Nafion Nanocomposite for Methanol Electrooxidation

2008 ◽  
Vol 47-50 ◽  
pp. 991-994 ◽  
Author(s):  
Yu Chen Tsai ◽  
Yu Huei Hong ◽  
Ping Chieh Hsu
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotube ◽  
Modified Electrode ◽  
Methanol Electrooxidation ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Ru Nanoparticles ◽  
Oxidation Of Methanol ◽  
Transmission Electron ◽  
And Performance

This work presented the electrochemical reduction of platinum (Pt) and ruthenium (Ru) nanoparticles within multiwalled carbon nanotube-Nafion (MWCNT-Nafion) composite for electrochemical oxidation of methanol. The structure of the resulting Pt-Ru-MWCNT-Nafion nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy. Electrochemical properties of Pt-Ru-MWCNT-Nafion nanocomposite were investigated by cyclic voltammetry in a 2 M CH3OH + 1 M H2SO4 aqueous solutions. The Pt-Ru-MWCNT-Nafion nanocomposite modified electrode had high electrocatalytic activity and performance toward the methanol electrooxidation as compared with Pt-MWCNT-Nafion nanocomposite modified electrode.

Synthesis of cadmium oxide and carbon nanotube based nanocomposites and their use as a sensing interface for xanthine detection

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 29675-29683 ◽  
Author(s):  
U. Jain ◽  
J. Narang ◽  
K. Rani ◽  
Burna Burna ◽  
Sunny Sunny ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Composite Film ◽  
Xanthine Oxidase ◽  
Cadmium Oxide ◽  
Multiwalled Carbon Nanotube ◽  
Oxide Nanoparticles ◽  
Multiwalled Carbon ◽  
Au Electrode ◽  
Carbodiimide Chemistry

Xanthine oxidase (XOD) was immobilized covalently via carbodiimide chemistry onto cadmium oxide nanoparticles (CdO)/carboxylated multiwalled carbon nanotube (c-MWCNT) composite film electrodeposited onto Au electrode.

Structure-property relationships in polypropylene/poly(ethylene-co-octene)/multiwalled carbon nanotube nanocomposites prepared via a novel eccentric rotor extruder

2018 ◽  
Vol 38 (5) ◽  
pp. 427-435 ◽  
Author(s):  
Cong Meng ◽  
Jin-ping Qu
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Structure Property ◽  
Excellent Performance ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Eccentric Rotor ◽  
Elongation Flow ◽  
Poly Ethylene

Abstract In this work, polypropylene/poly(ethylene-co-octene)/multiwalled carbon nanotube (PP/POE/MWCNT) nanocomposites with different contents of MWCNTs were prepared by an eccentric rotor extruder to obtain engineering materials with excellent performance capability. Microphotographs (scanning electron microscopy and transmission electron microscopy) and dynamic mechanical analysis indicate that the MWCNTs were well dispersed in the polymer matrix under the elongation flow. The crystallization behavior was explored by X-ray diffraction and differential scanning calorimetry. The results show that MWCNTs promote heterogeneous nucleation and improve the To, Tc and Te values of the composites. On the basis of the rheology analysis, the complex viscosity of the PP/POE/MWCNT composites increased and formed an obvious Newton plat in the low-frequency range; both the G′ and G″ of all the samples increased monotonically, and a percolation threshold appeared for 1 wt% MWCNTs. Thus, the mechanical properties of the nanocomposites prepared under an elongation flow lead to an effective strengthening of PP/POE better than under a shear flow. This work provides a novel method based on elongational rheology to prepare engineered materials that possess excellent performance capabilities.

Preparation and Characterization of Poly(ε-Caprolactone)/Multiwalled Carbon Nanotube Composites

2007 ◽  
Vol 342-343 ◽  
pp. 737-740
Author(s):  
Hun Sik Kim ◽  
Byung Hyun Park ◽  
Yun Seok Chae ◽  
Jin San Yoon ◽  
Hyoung Joon Jin
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotube ◽  
General Purpose ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Mwcnt Loading ◽  
Scanning Electron

In this study, poly(ε-caprolactone) (PCL)/multiwalled carbon nanotube (MWCNT) composites with different contents of MWCNTs were successfully prepared by solution compounding, a method which could make them good competitors for commodity materials such as general purpose plastics, while allowing them to keep their complete biodegradability. For the homogeneous dispersion of the MWCNTs in the polymer matrix, oxygen-containing groups were introduced on their surface. The mechanical properties of the PCL/MWCNT composites were effectively increased due to the incorporation of the MWCNTs. The composites were characterized using scanning electron microscopy, in order to obtain information on the dispersion of the MWCNTs in the polymeric matrix. In the case of the composites containing 2.0 wt% of MWCNTs in their matrix, the strength and modulus of the composites were increased by 18.4% and 178.4%, respectively. In addition, the dispersion of the MWCNTs in the PCL matrix resulted in a substantial decrease in the electrical resistivity of the composites as the MWCNT loading was increased from 0 to 2.0 wt%.

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