A novel approach to align carbon nanotubes via water-assisted shear stretching

2018 ◽  
Vol 164 ◽  
pp. 1-7 ◽  
Author(s):  
Yingying Yu ◽  
Changhao Zhao ◽  
Qingwen Li ◽  
Jianying Li ◽  
Yuntian Zhu
Keyword(s):  
Carbon Nanotubes ◽  
Novel Approach ◽  
Align Carbon Nanotubes

Novel approach to align carbon nanotubes for planar type devices

2008 ◽  
Author(s):  
D. Pribat ◽  
M. Gowtham ◽  
C. Cojocaru ◽  
B. Marquardt ◽  
A. Q. L. Quang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Novel Approach ◽  
Align Carbon Nanotubes

Carbon Nanotubes Grown on Metallic Wires by Cold Plasma Technique

2002 ◽  
Vol 737 ◽  
Author(s):  
D. Sarangi ◽  
A. Karimi
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Growth Conditions ◽  
Effect Of Temperature ◽  
Rutherford Back Scattering ◽  
Novel Approach ◽  
Transmission Electron ◽  
Back Scattering ◽  
Metallic Wires ◽  
Metal Wires

ABSTRACTCarbon nanotubes on metallic wires may be act as electrode for the field emission (FE) luminescent devices. Growing nanotubes on metallic wires with controlled density, length and alignment are challenging issues for this kind of devices. We, in the present investigation grow carbon nanotubes directly on the metal wires by a powerful but simple technique. A novel approach has been proposed to align nanotubes during growth. Methane, acetylene and dimethylamine have been used as source gases. With the same growth conditions (viz. pressure, growth temperature and plasma) methane does not produce any nanotube but nanotubes grown with dimethylamine show shorter length and radius than acetylene. The effect of temperature to control the radius, time to control the density, plasma conditions to align the nanotubes has been focused. Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Rutherford Back Scattering (RBS) are used to characterize the nanotubes.

scholarly journals CNT-Based Solar Thermal Coatings: Absorptance vs. Emittance

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1101
Author(s):  
Yelena Vinetsky ◽  
Jyothi Jambu ◽  
Daniel Mandler ◽  
Shlomo Magdassi
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Solar Thermal ◽  
Good Adhesion ◽  
Solar Absorptance ◽  
Novel Approach ◽  
Binder Concentration ◽  
Excellent Adhesion ◽  
Minimum Ratio

A novel approach for fabricating selective absorbing coatings based on carbon nanotubes (CNTs) for mid-temperature solar–thermal application is presented. The developed formulations are dispersions of CNTs in water or solvents. Being coated on stainless steel (SS) by spraying, these formulations provide good characteristics of solar absorptance. The effect of CNT concentration and the type of the binder and its ratios to the CNT were investigated. Coatings based on water dispersions give higher adsorption, but solvent-based coatings enable achieving lower emittance. Interestingly, the binder was found to be responsible for the high emittance, yet, it is essential for obtaining good adhesion to the SS substrate. The best performance of the coatings requires adjusting the concentration of the CNTs and their ratio to the binder to obtain the highest absorptance with excellent adhesion; high absorptance is obtained at high CNT concentration, while good adhesion requires a minimum ratio between the binder/CNT; however, increasing the binder concentration increases the emissivity. The best coatings have an absorptance of ca. 90% with an emittance of ca. 0.3 and excellent adhesion to stainless steel.

A novel approach to the uniformly distributed carbon nanotubes with intact structure in aluminum matrix composite

2019 ◽  
Vol 2 (3) ◽  
pp. 540-548 ◽  
Author(s):  
Farhad Saba ◽  
Seyed Abdolkarim Sajjadi ◽  
Simin Heydari ◽  
Mohsen Haddad-Sabzevar ◽  
Jaafar Salehi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Matrix Composite ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Novel Approach

Carbon nanotubes and nanostructures grown at below 400°C

2005 ◽  
Vol 901 ◽  
Author(s):  
Guan Yow Chen ◽  
P.C.H. Poa ◽  
S.J. Henley ◽  
V. Stolojan ◽  
S.R.P. Silva
Keyword(s):  
Carbon Nanotubes ◽  
Thermodynamic Simulation ◽  
Chemical Vapour ◽  
Growth Surface ◽  
Ni Catalyst ◽  
Process Conditions ◽  
Thermal Barrier ◽  
Titanium Layer ◽  
Novel Approach ◽  
Growth Properties

AbstractIn this paper, we report clear evidence for the growth of carbon nanotubes and nanostructures at low substrate temperatures, using direct-current plasma-enhanced chemical vapour deposition. The catalyst particles are mounted on a titanium layer which acts as a thermal barrier, and allows for a larger temperature gradient between the Ni catalyst surface and the substrate. A simple thermodynamic simulation shows that the temperature differential between the substrate growth surface and the growth electrode is determined by the thickness of the titanium layer. This facilitates the growth of nanotubes, as opposed to nanofibres with herring-bone or amorphous structures. The growth properties are discussed as a function of the bias voltage and hydrocarbon concentration. The heating during growth provided solely by the plasma is below 400°C and is dependent on the process conditions and the electrode configuration in the growth chamber. These conditions need to be taken into account when comparing processes across different growth methods and instruments. The novel approach based on the use of a thermal barrier ensures the synthesis of carbon nanotubes at room temperature substrate conditions, which can be attained with a suitable cooling scheme.

Synthesis and Photoluminescence of Y2O3:RE3+ (RE = Eu, Tb, Dy) Porous Nanotubes Templated by Carbon Nanotubes

2006 ◽  
Vol 6 (1) ◽  
pp. 120-124 ◽  
Author(s):  
Guixia Liu ◽  
Guangyan Hong
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Rare Earth Ions ◽  
Cubic Phase ◽  
Novel Approach ◽  
Transmission Electron ◽  
Characteristic Emission ◽  
Xrd Patterns ◽  
Photoluminescence Studies ◽  
Micrometer Scale

Y2O3:RE3+ (RE = Eu, Tb, Dy) porous nanotubes were first synthesized using carbon nanotubes as template. The morphology of the coated precursors and porous Y2O3:Eu3+ nanotubes was determined by scanning electron Microscopy (SEM) and transmission electron microscopy (TEM). It was found that the coating of precursors on carbon nanotubes (CNTs) is continuous and the thickness is about 15 nm, after calcinated, the Y2O3:Eu3+ nanotubes are porous with the diameter size in the range of 50–80 nm and the length in micrometer scale. X-ray diffraction (XRD) patterns confirmed that the samples are cubic phase Y2O3 and the photoluminescence studies showed that the porous rare earth ions doped nanotubes possess characteristic emission of Eu3+, Tb3+, and Dy3+. This method may also provide a novel approach to produce other inorganic porous nanotubes used in catalyst and sensors.

A facile and novel approach towards carboxylic acid functionalization of multiwalled carbon nanotubes and efficient water dispersion

2013 ◽  
Vol 108 ◽  
pp. 253-256 ◽  
Author(s):  
Ata-ur Rehman ◽  
Syed Mustansar Abbas ◽  
Hafiz Muhammad Ammad ◽  
Amin Badshah ◽  
Zulfiqar Ali ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carboxylic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Water Dispersion ◽  
Novel Approach
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