Diffusion of Multiwall Carbon Nanotubes into Industrial Polymers

2019 ◽  
Vol 23 ◽  
pp. 213-221
Author(s):  
Ponnusamy Senthil Kumar ◽  
A. Saravanan
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Polymer Chains ◽  
Carbon Particles ◽  
Mechanical Quality ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Weight Proportion ◽  
Carbon Molecule

Carbon nanotubes (CNTs) are made out of carbon atoms connected in hexagonal shapes, with every carbon molecule covalently attached to three other carbon particles. The properties of nanotubes have made scientists and organizations think about utilizing them in many fields. For instance, since carbon nanotubes have the most noteworthy quality to-weight proportion of any known material. Nanocomposites of adjusted multi walled carbon nanotubes (MWCNTs) installed in a polymer matrix yield a one of a kind mix of warm and electrical properties and mechanical quality. The composites combine the vast pseudo capacitance of the directing polymers with the quick charging/releasing two-fold film impedance and incredible machine-driven possessions of the carbon nanotubes. The electrochemically co-stored composites are the most homogeneous and demonstrate an unordinary communication between the polymer and nanotubes, offering ascend to a reinforced electron delocalisation and conjugation along the polymer chains

A Study on the Effects of Multiwall Carbon Nanotubes on Dynamic Stiffness of Hydrophilic-base Magnetorheological Gel

2019 ◽  
Vol 15 (3) ◽  
pp. 319-323 ◽  
Author(s):  
Young-Keun Kim ◽  
Jangheon Kim ◽  
Daeik Jang ◽  
Soohyun Kim ◽  
Wonsuk Jung
Keyword(s):  
Carbon Nanotubes ◽  
Vibration Control ◽  
Control Systems ◽  
Dynamic Stiffness ◽  
Multiwall Carbon Nanotubes ◽  
Silicon Oil ◽  
Multi Walled Carbon Nanotubes ◽  
Stiffness Variation ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon

Background: Recently, addition of multi-walled-carbon-nanotubes (MWCNTs) has been researched to enhance the rheological properties of magnetorheological (MR) materials of fluid, elastomer and gel. However, there is a lack of study on the effects of MWCNTs on hydrophilic based MR gels (MRG), which have shown a high potential to be applied in smart vibration control systems. Objective: This study is aimed to analyze the effect of MWCNTs on the dynamic stiffness of hydrophilic based MRG. Method: Dynamic stiffness of hydrophilic based MRG was experimentally computed under different magnetic fields and strain amplitudes. Results: Experimental results indicate that the addition of MWCNTs in hydrophilic MRG showed overall degradation of stiffness variation in contradictory to similar research performed on silicon oil based MR gel. Conclusion: These contradictory results reveal that MRGs of hydrophilic base have a different interaction with MWCNTs than hydrophobic oil base.

Functionalization by Acidic Treatment in the Purification of Multiwalled Carbon Nanotubes (MWCNTs)

2013 ◽  
Vol 685 ◽  
pp. 155-158
Author(s):  
Mohamad Fauzi Ahmad ◽  
Adlan Akram Mohammad Mazuki ◽  
Nurhalawa Md Yusof ◽  
Rosiyah Yahya ◽  
Siti Murni M. Zawawi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Deionized Water ◽  
Raw Material ◽  
Reflux Condenser ◽  
Multiwalled Carbon ◽  
Decomposition Products ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon

Comparative studies of two multi-walled carbon nanotubes (MWCNT) from different manufacturers were reported. The purification and functionalization of commercial multiwall carbon nanotubes were investigated. MWCNTs were treated with boiling concentrated HNO3 under a reflux condenser for 2 hours at 100 °C in order to purify and oxidize the raw material. The oxidized MWCNTs were rinsed with deionized water until stabilization of the filtrate pH. The measurement technique was by thermogravimetric analysis (TGA) for thermal analysis decomposition products. Meanwhile, the chemical shifted in MWCNTs can be determined by using Raman Spectroscopy.

scholarly journals An investigation of microstructural, magnetic and microwave absorption properties of multi-walled carbon nanotubes/Ni0.5Zn0.5Fe2O4

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Muhammad Syazwan Mustaffa ◽  
Raba’ah Syahidah Azis ◽  
Nor Hapishah Abdullah ◽  
Ismayadi Ismail ◽  
Idza Riati Ibrahim
Keyword(s):  
Carbon Nanotubes ◽  
Research Work ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Microwave Absorption Properties ◽  
X Band ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Microwave Characteristics

Abstract The enhancement of microwave absorbing properties in nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) via multiwall carbon nanotubes (MWCNT) growth is studied in this research work. Ni0.5Zn0.5Fe2O4 was initially synthesized by mechanical alloying followed by sintering at 1200 °C and the microstructural, electromagnetic and microwave characteristics have been scrutinized thoroughly. The sintered powder was then used as a catalyst to grow MWCNT derived from chemical vapor deposition (CVD) method. The sample was mixed with epoxy resin and a hardener for preparation of composites. The composite of multi-walled carbon nanotubes/Ni0.5Zn0.5Fe2O4 shown a maximum reflection loss (RL) of −19.34 dB at the frequency and bandwidth of 8.46 GHz and 1.24 GHz for an absorber thickness of 3 mm for losses less than −10 dB. This acquired result indicates that multi-walled carbon nanotubes/Ni0.5Zn0.5Fe2O4 could be used as a microwave absorber application in X-band.

scholarly journals Decreasing Microbial Fuel Cell Start-Up Time Using Multi-Walled Carbon Nanotubes

2019 ◽  
Vol 3 (2) ◽  
pp. 109 ◽  
Author(s):  
Antonia Jimenez Rodríguez ◽  
Antonio Serrano ◽  
Teresa Benjumea ◽  
Rafael Borja ◽  
M. El Kaoutit ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Multiwall Carbon Nanotubes ◽  
Bioelectrochemical Systems ◽  
Start Up ◽  
Multi Walled Carbon Nanotubes ◽  
Time Required ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon

The bioelectrochemical systems are a sustainable technology that can be used to obtain electricity and/or reduced compounds. However, this novel technology presents several challenges prior to its implementation at full-scale. The aim of the present study was to evaluate different nanomaterials of electrode and mediators to increase the performance of BioElectrochemical Systems production. In order to achieve this objective, it was compared the use of Multiwall Carbon Nanotubes and Multiwall Carbon Nanotubes plus electron exogenous mediator (Meldola’s Blue) against plain graphite anode in order to evaluate the overall start-up time and other electro-chemical features. The use of multi-walled carbon nanotubes reduces substantially (by 75%) the start-up time required in a microbial fuel cell to produce stable voltage both, with and without the use of mediator compare to the plain anode. This reduction of the required time can be a consequence of the formation of anodic binders between this compound and the bacteria. With the independence of the start-up time, the current production was similar in the three studied cases, about 650 mV. Use of nanotubes modified anode surfaces might be especially interesting in cases of recovery after unstable operation of a microbial fuel cell, and/or reducing the start-up time for the generation of energy from new systems.

Mechanical Properties Improvements of Resin-Based Nanocomposites Reinforced by Multi-Walled Carbon Nanotubes

2013 ◽  
Vol 748 ◽  
pp. 222-226
Author(s):  
Ehsan Darabi ◽  
Reza Bakhtiari ◽  
Ali Ravaee
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Epoxy Resins ◽  
Multiwall Carbon Nanotubes ◽  
Two Phase ◽  
Conventional Tests ◽  
Multi Walled Carbon Nanotubes ◽  
Strength And Stiffness ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon

The experimental results of epoxy resin modified by multiwall carbon nanotubes (MWCNTs) as two-phase nanocomposite are presented in the current paper. Effects of improved dispersion on reinforcement of the epoxy resins were investigated through three different prevalent conventional tests. Three various types of test specimens in four values of Mwcnt weight ratios, 0, 0.5, 1 and 2% to the GY6010 resin were fabricated according to corresponding ASTM standards by a novel technique. The static strength and stiffness tests led to the conclusion that the appropriate dispersion of Mwcnts into epoxy improves mechanical properties of two-phase nanocoposites.

scholarly journals Novel Method of Evaluating the Purity of Multiwall Carbon Nanotubes Using Raman Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Young Chul Choi ◽  
Kyoung-In Min ◽  
Mun Seok Jeong
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Reference Material ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Excitation Wavelength ◽  
Established Method ◽  
Carbon Particles ◽  
Novel Method ◽  
Multiwall Carbon

We propose the quantitative method of evaluating the purity of multiwall carbon nanotubes (MWCNTs) using Raman spectroscopy. High purity MWCNTs were prepared by chemical vapor deposition (CVD) to be used as a reference material with 100% purity. Since the intensity and wavenumber ofD′′-band located at around 1500 cm−1were found to be independent of the excitation wavelength of a laser, the purity of MWCNTs was measured by comparing the intensity ratio ofD′′-band toG-band (ID′′/IG) of the sample with that of a reference material. The established method was verified by testing the mixture of amorphous carbon particles and reference MWCNTs.

Reinforcing Effects of Poly(D-Lactide)-g-Multiwall Carbon Nanotubes on Polylactide Nanocomposites

2015 ◽  
Vol 15 (10) ◽  
pp. 8086-8092 ◽  
Author(s):  
Jeong Hee Yang ◽  
Jae Yun Lee ◽  
In-Joo Chin
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Testing Machine ◽  
Multiwall Carbon Nanotubes ◽  
Hydroxyl Groups ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Polylactide (PLA) nanocomposites with multi-walled carbon nanotubes (MWNTs) grafted with poly(L-lactide) or poly(D-lactide) were prepared by solution casting, and their thermal and mechanical properties were evaluated. MWNTs containing hydroxyl groups were treated by ring-opening polymerization of either L-lactide or D-lactide. Fourier transform infrared spectroscopy confirmed that the MWNT surfaces had been modified by the PLLA or PDLA chains. The thermal properties were measured by differential scanning calorimetry and thermogravimetric analysis. The mechanical properties were examined using a universal testing machine. The morphology of the fractured surfaces of the PLA nanocomposites was observed by scanning electron microscopy and transmission electron microscopy. PDLA-g-MWNTs were dispersed more uniformly compared to PLLA-g-MWNTs in the PLA matrix. The incorporation of PDLA-g-MWNTs greatly improved the tensile strength of the nanocomposites regardless of the contents. Thermal analysis revealed different characteristics at specific composites depending on the type of modification.

scholarly journals Effects of Graphene Nanoplatelets and Multiwall Carbon Nanotubes on the Structure and Mechanical Properties of Poly(lactic acid) Composites: A Comparative Study

2019 ◽  
Vol 9 (3) ◽  
pp. 469 ◽  
Author(s):  
Todor Batakliev ◽  
Ivanka Petrova-Doycheva ◽  
Verislav Angelov ◽  
Vladimir Georgiev ◽  
Evgeni Ivanov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Low Cost ◽  
Multiwall Carbon Nanotubes ◽  
Poly Lactic Acid ◽  
Carbon Filler ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Fillers ◽  
Walled Carbon Nanotubes

Poly(lactic acid)/graphene and poly(lactic acid)/carbon nanotube nanocomposites were prepared by an easy and low-cost method of melt blending of preliminary grinded poly(lactic acid) (PLA) with nanosized carbon fillers used as powder. Morphological, structural and mechanical properties were investigated to reveal the influence of carbon nanofiller on the PLA–based composite. The dependence of tensile strength on nanocomposite loading was defined by a series of experiments over extruded filaments using a universal mechanical testing instrument. The applying the XRD technique disclosed that compounds crystallinity significantly changed upon addition of multi walled carbon nanotubes. We demonstrated that Raman spectroscopy can be used as a quick and unambiguous method to determine the homogeneity of the nanocomposites in terms of carbon filler dispersion in a polymer matrix.

Electric Field Effects on Self-Organization Processes during Droplet Evaporation of Multiwall Carbon Nanotube Aqueous Suspension

2018 ◽  
Vol 936 ◽  
pp. 25-30
Author(s):  
A.P. Kuzmenko ◽  
N.A. Khokhlov ◽  
Thet Phyo Naing ◽  
Myo Min Than
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Aqueous Suspension ◽  
Multiwall Carbon Nanotubes ◽  
Droplet Evaporation ◽  
Self Organization ◽  
Uniform Electric Field ◽  
Multiwall Carbon Nanotube ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon

The self-organization of COOH-functionalized multiwall carbon nanotubes (MWCNTs) during droplet evaporation of their aqueous suspension in a constant uniform electric field (E) was investigated. It was established that the COOH-functionalization polarizes the MWCNTs in the transverse direction to their axis. Depending on their size, MWCNTs tended to agglomerate into three different stable structures in different drop regions. There were linear, fractal and cluster structures (LS, FS, and CS). Sizes of the FSs decreased as 1/Е, whereas the rate of their growth increased as Е2. The single-walled carbon nanotubes (SWCNTs) were found inside the LSs and CSs. The chiral indices of the SWCNTs were determined, corresponding to metallic and semiconducting conductivities. An analysis showed that as a result of coagulation and amassment of the carbon nanotubes (CNTs) near electrodes, there were formed conductive regions. When the concentration of MWCNTs reached some value in part nearest to an electrode, this part became conductive. The positive and negative electrodes, formed now by MWCNTs, shifted towards each other. The observed effects show that considered self-organization is controllable by the electric field.

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