Experimental Study on Heat Transfer of Multi-Walled Carbon Nanotubes/Water Nanofluids in Horizontal Microtubes

2016 ◽  
Author(s):  
Mehrdad Karimzadehkhouei ◽  
Abdolali Khalili Sadaghiani ◽  
Kürşat Şendur ◽  
M. Pınar Mengüç ◽  
Ali Koşar
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Considerable Effect ◽  
Outer Diameter ◽  
Heat Transfer Characteristics ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Study Heat Transfer ◽  
20 Nm ◽  
Walled Carbon Nanotubes

In this study, heat transfer characteristics of multi-walled carbon nanotube based nanofluids were investigated in horizontal microtubes with outer and inner diameters of ∼1067 and ∼889 μm, respectively. Carbon nanotubes (CNTs) with outer diameter of 10–20 nm and length of 1–2 micron as non-spherical nanoparticles were used for nanofluid preparation, where water was considered as basefluid. Nanofluid was characterized using the Scanning Electron Microscopy (SEM). According to obtained results, deposited CNTs have considerable effect on the convective heat transfer inside the microtube.

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.

PREPARATION AND PHOTOCATALYTIC PROPERTY OF MULTI-WALLED CARBON NANOTUBES/TiO2 NANOHYBRIDS

2013 ◽  
Vol 06 (02) ◽  
pp. 1350018 ◽  
Author(s):  
C. S. CHEN ◽  
X. D. XIE ◽  
S. Y. CAO ◽  
Q. C. LIU ◽  
J. C. KUANG ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Methyl Orange ◽  
Photocatalytic Property ◽  
Additional Treatment ◽  
Photocatalytic Ability ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
20 Nm ◽  
Walled Carbon Nanotubes ◽  
Very High

A simple and versatile approach decorated TiO2 nanoparticles on the surface of multi-walled carbon nanotube (MWNTs) was reported. MWNTs can be continuously coated by the layer of anatase TiO2 nanoparticles with the thickness of about 20 nm by the assistance of salicylamide. Moreover, anatase TiO2 nanoparticles with the size of about 10 nm are uniformly deposited on MWNTs by using microwave radiation. The synthetic MWNTs/ TiO2 hybrids have been proven to be very high photocatalytic ability for methyl orange (MO) without any additional treatment.

scholarly journals Thermophysical properties of nanofluids MWCNT (multi-walled carbon nanotubes) in water for emergency coolant from nuclear reactors

2021 ◽  
Vol 8 (3A) ◽  
Author(s):  
Alexandre Melo Oliveira ◽  
Amir Zacarias Mesquita ◽  
Enio Pedone Bandarra ◽  
Daniel Flórez Morales
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Thermophysical Properties ◽  
Nuclear Reactors ◽  
Energy Systems ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

To evaluate the synthesis and characterization of MWCNT (Multi-walled Carbon Nanotubes) with different degrees of functionalization in distilled water. The thermophysical properties (thermal conductivity and viscosity) of these nanofluids were measured at a temperature range (20-60°C) and concentrations (0.005-0.05%) by volume. Increases in thermal conductivity and viscosity were found 9.3% and 4.7%, respectively, at a volumetric concentration of 0.01% at a temperature of 30°C. The study of new fluids that improve the rate of removal of heat is fundamental to obtain greater efficiency of energy systems. Among the several factors that compromise the efficiency of the energy systems, we can highlight the thermophysical limitations of the conventional fluids, inhibiting in a very significant way some industrial applications. In this work we intend to improve the heat transfer characteristics of fluids commonly used by the addition of nanoparticles, made up of carbon nanotubes, in water which is the most used fluid for the cooling of nuclear reactors in operation today. It is intended to improve the heat transfer characteristics of fluids commonly used by the addition of nanoparticles, made of carbon nanotubes, through the addition of nanoparticles, made up of carbon nanotubes, in water which is the most used fluid for refrigeration of nuclear reactors currently in operation. In order to assess its benefits for the applicability and nuclear systems, ie primary coolant, safety systems, major accident mitigation strategies.

scholarly journals STUDY OF MUTAGENIC ACTIVITY NANO- AND MICROPARTICLES IN THE AMES TEST (SALMONELLA / MICROSOME)

2019 ◽  
Vol 98 (4) ◽  
pp. 455-460
Author(s):  
Lyudmila V. Akhaltseva ◽  
V. S. Zhurkov ◽  
L. P. Sycheva ◽  
O. N. Savostikova ◽  
A. V. Alekseeva
Keyword(s):  
Carbon Nanotubes ◽  
Ames Test ◽  
Mutagenic Activity ◽  
Dose Range ◽  
Gene Mutations ◽  
Outer Diameter ◽  
Multi Walled Carbon Nanotubes ◽  
Inner Diameter ◽  
Substitution Mutations ◽  
Walled Carbon Nanotubes

Introduction. One of the important steps in assessing the nanoparticles (NP) safety is the analysis of mutagenic activity, including the evaluation of gene, chromosomal, and genomic mutations. Material and methods. The purpose of this investigation is to study the ability of different NP aqueus suspensions and the same compounds in microforms to unduce gene mutations in Salmonella/microsome test (Ames test). Anatase titanium dioxide NP coated with simethicone (33.16 ± 16.7 nm, 5-50000 μg/ml), magnetite NP coated with silicate (10 nm, 0.92-575 μg/ml), silver NP coated with аrabian gum (14 ± 0.2 nm, 5-50000 μg/ml), aluminum hydroxide nanofibres (50-70 nm, 24-3000 μg/ml) and multi-walled carbon nanotubes (Taunit MWСNTs, outer diameter 15-40 nm, inner diameter 3-8 nm, length 2 and more microns, 5-50000 μg/ml). In parallel, the mutagenic activity of equivalent microparticles was evaluated in experiments. Ames test (Salmonella/microsomes) registers gene mutations induced by a different mechanism of action, in the variant with preincubation. A set of Salmonella typhimurium indicator strains: TA 100 (base pair substitution mutations), TA 98 and TA 97 (mutations of the frameshift type of the genetic code) were used. Using addition the S9 microsomal activating mixture during the experiment makes it is possible to determine the effect not only of the substances themselves, but also of their metabolites. Conclusion. The investigated nanomaterials as well as their micro analogs in the studied dose range did not induce gene mutations in the Ames test both in presence and absence microsomal activating mixture.

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