Rheological Behavior of Carbon Nanotubes as an Additive on Lithium Grease

The rheological behaviors of carbon nanotubes (CNTs) as an additive on lithium grease at different concentrations were examined under various settings of shear rate, shear stress, and apparent viscosity. The results indicated that the optimum content of the CNTs was 2%. These experimental investigations were evaluated with a Brookfield Programmable Rheometer DV-III ULTRA. The results indicated that the shear, stress and apparent viscosity increase with the increase of CNTs concentration. The microstructure of CNTs and lithium grease was examined by high resolution transmission electron microscope (HRTEM) and scanning electron microscope (SEM). The results indicated that the microscopic structure of the lithium grease presents a more regular and homogeneous network structure, with long fibers, which confirms the rheological stability.

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Tribological Behavior of Carbon Nanotubes as an Additive on Lithium Grease

Journal of Tribology ◽

10.1115/1.4028225 ◽

2014 ◽

Vol 137 (1) ◽

Cited By ~ 49

Author(s):

Alaa Mohamed ◽

T. A. Osman ◽

A. Khattab ◽

M. Zaki

Keyword(s):

Carbon Nanotubes ◽

Arc Discharge ◽

Average Diameter ◽

Friction Reduction ◽

Lithium Grease ◽

X Ray ◽

Transmission Electron ◽

Boundary Film ◽

Load Carrying ◽

Worn Surface

Carbon nanotubes (CNTs) with 10 nm average diameter and 5 μm in length were synthesized by electric arc discharge. The morphology and structure of CNTs were characterized by high resolution transmission electron microscopy (HRTEM) and X-ray powder diffraction. The tribological properties of CNTs as an additive on lithium grease were evaluated with a four ball tester. The results show that the grease with CNTs exhibit good performance in antiwear (AW) and decrease the wear scare diameter (WSD) about 63%, decrease friction reduction about 81.5%, and increase the extreme pressure (EP) properties and load carrying capacity about 52% with only 1% wt. of CNTs added to lithium grease. The action mechanism was estimated through analysis of the worn surface with a scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The results indicate that a boundary film mainly composed of CNTs, Cr, iron oxide, and other organic compounds was formed on the worn surface during the friction process.

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Influence Analysis of Sampling Time for Synthesis of Carbon Nanotubes in the V-Type Pyrolysis Flame

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.221.235 ◽

2011 ◽

Vol 221 ◽

pp. 235-239 ◽

Cited By ~ 1

Author(s):

Yuan Chao Liu ◽

Bao Min Sun ◽

Zhao Yong Ding

Keyword(s):

Carbon Nanotubes ◽

Electron Microscope ◽

Experimental System ◽

Growth Period ◽

Sampling Time ◽

High Yield ◽

Spray Pyrolysis Method ◽

Transmission Electron ◽

Novel Method ◽

Synthesis Of Carbon Nanotubes

Synthesis of carbon nanotubes from V-type pyrolysis flame is a kind of novel method. It needs simple laboratory equipments and normal atmosphere pressure. The V-type pyrolysis flame experimental system is introduced. Carbon source is the carbon monoxide and heat source is from acetylene/air premixed flame. Pentacarbonyl iron, served as catalyst, is transported by spray- pyrolysis method into the flame. The carbon nanotubes were characterized by scanning electron microscope and transmission electron microscope. This study aims to find the formation rule of carbon nanotubes from the V-type pyrolysis flame in different sampling times. The carbon nanotubes with less impurity and high yield were captured successfully in the V-type pyrolysis flame. The diameter of carbon nanotubes was approximate between 10nm and 20nm, and its length was dozens of microns. When the sampling time was below 3 minutes, the growth of carbon nanotubes came into the preparation growth period. The length of the carbon nanotubes increased gradually and the diameter had no obvious change with the extension of sampling time. When the sampling time was continued to the 5th minute, the growth of carbon nanotubes came into the exuberant growth period. The carbon nanotubes growth was finished within 5minutes. Longer sampling time was meaningless after the carbon nanotubes formation.

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Characteristics of multiwalled carbon nanotubes-rhenium nanocomposites with varied rhenium mass fractions

Nanomaterials and Nanotechnology ◽

10.1177/1847980417707173 ◽

2017 ◽

Vol 7 ◽

pp. 184798041770717 ◽

Cited By ~ 3

Author(s):

Anna D Dobrzańska-Danikiewicz ◽

Weronika Wolany ◽

Dariusz Łukowiec ◽

Karolina Jurkiewicz ◽

Paweł Niedziałkowski

Keyword(s):

Carbon Nanotubes ◽

Electron Microscope ◽

Multiwalled Carbon Nanotubes ◽

Transmission Electron Microscope ◽

Scanning Transmission Electron Microscope ◽

Dark Field ◽

Multiwalled Carbon ◽

Weight Percentage ◽

Transmission Electron ◽

Scanning Transmission

The purpose of the article is to discuss the process of oxidation of carbon nanotubes subsequently subjected to the process of decoration with rhenium nanoparticles. The influence of functionalization in an oxidizing medium is presented and the results of investigations using Raman spectroscopy and infrared spectroscopy are discussed. Multiwalled carbon nanotubes rhenium-type nanocomposites with the weight percentage of 10%, 20% and 30% of rhenium are also presented in the article. The structural components of such nanocomposites are carbon nanotubes decorated with rhenium nanoparticles. Microscopic examinations under transmission electron microscope and scanning transmission electron microscope using the bright and dark field confirm that nanocomposites containing about 20% of rhenium have the most homogenous structure.

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Carbon Nanotubes with Uniform Wall Thickness Synthesized Via a Solid-Liquid Reaction

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.194-196.442 ◽

2011 ◽

Vol 194-196 ◽

pp. 442-445

Author(s):

Cai Liu Yin ◽

Guo Fu Wen ◽

Qi Zhong Huang ◽

Xiu Fei Wang

Keyword(s):

Carbon Nanotubes ◽

Electron Microscope ◽

Wall Thickness ◽

Carbon Sources ◽

Calcium Carbide ◽

X Ray Diffraction ◽

Liquid Reaction ◽

Transmission Electron ◽

Uniform Wall ◽

Solid Liquid

Carbon nanotubes(CNTs) with uniform wall thickness were synthesized by a solid-liquid reaction route. Calcium carbide block and carbon tetrachloride as double carbon sources were enclosed in a 100ml stainless steel autoclave at 400°C for 8 hours. The fabricated products were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and Transmission electron microscope (TEM). The research results indicate that the synthesized CNTs have lengths on the order of 10μm and external diameters in the range of 120-200nm. The nanotubes are typically the uniform inner diameters of 70nm and grow in the same direction. The growth mechanism is simply discussed.

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Selective Processing of Individual Carbon-Nanotubes Using Atomic Force Microscopy Installed in Transmission Electron Microscope

10.7567/ssdm.2001.d-9-3 ◽

2001 ◽

Author(s):

Toru Kuzumaki ◽

Tokushi Kizuka ◽

Yasuhiro Horiike

Keyword(s):

Carbon Nanotubes ◽

Atomic Force Microscopy ◽

Electron Microscope ◽

Transmission Electron Microscope ◽

Force Microscopy ◽

Atomic Force ◽

Transmission Electron ◽

Selective Processing

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Photovoltaic properties of multi walled carbon nanotubes - poly(3-octathiophene) conducting polymer blends structures

MRS Proceedings ◽

10.1557/opl.2013.406 ◽

2013 ◽

Vol 1493 ◽

pp. 139-144 ◽

Cited By ~ 3

Author(s):

Punya A. Basnayaka ◽

Pedro Villalba ◽

Manoj K. Ram ◽

Lee Stefanakos ◽

Ashok Kumar

Keyword(s):

Carbon Nanotubes ◽

Electron Microscope ◽

Conducting Polymer ◽

Photoelectrochemical Cell ◽

Photovoltaic Properties ◽

Multi Wall Carbon Nanotubes ◽

Transmission Electron ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Scanning Electron

AbstractIn the present study, we have studied photoelectrochemical properties of poly(3-octathiophene) (P3OT), blending with multi-wall carbon nanotubes (MWCNTs). P3OT blended with MWCNTs was characterized using Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Raman spectroscope, and Cyclic Voltammetry (CV) techniques, respectively. The photoelectrochemical current of the MWCNs-P3OT based cell under illumination was investigated by applying a voltage. The blend consisting of 10% MWCNTs in P3OT gave the promising photocurrent in 0.2 M tetra-butyl-ammonium-tetrafluoroborate (TBATFB), electrolyte. Experimental results indicate that photocurrent obtained from MWCNT-P3OT was three times higher than simple P3OT-based conducting polymer. The electrochemical responses of MWCNT-P3OT films in different electrolytes such as 0.2M TBATFB, 0.2 M LiClO4, 1 M H2SO4 and 0.2 M LiBF6 were investigated for comparative photocurrent properties of the photoelectrochemical cell.

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Characterization of carbon nanotubes by nanoprobe manipulation in transmission electron microscope

Diamond and Related Materials ◽

10.1016/j.diamond.2008.01.016 ◽

2008 ◽

Vol 17 (4-5) ◽

pp. 615-619 ◽

Cited By ~ 4

Author(s):

Toru Kuzumaki ◽

Yoshitaka Mitsuda

Keyword(s):

Carbon Nanotubes ◽

Electron Microscope ◽

Transmission Electron Microscope ◽

Transmission Electron

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A Comparative Study of Carbon Nanotubes Synthesized from Co/Zn/Al and Fe/Ni/Al Catalyst

E-Journal of Chemistry ◽

10.1155/2011/252875 ◽

2011 ◽

Vol 8 (3) ◽

pp. 1014-1021 ◽

Cited By ~ 1

Author(s):

Ezekiel Dixon Dikio

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Electron Microscope ◽

Thermogravimetric Analysis ◽

Catalyst System ◽

X Ray ◽

Transmission Electron ◽

Catalyst Systems ◽

Synthesis Of Carbon Nanotubes ◽

Scanning Electron

The catalyst systems Fe/Ni/Al and Co/Zn/Al were synthesized and used in the synthesis of carbon nanotubes. The carbon nanotubes produced were characterized by Field Emission Scanning Electron Microscope(FE-SEM), Energy Dispersive x-ray Spectroscopy(EDS), Raman spectroscopy, Thermogravimetric Analysis(TGA)and Transmission Electron Microscope(TEM). A comparison of the morphological profile of the carbon nanotubes produced from these catalysts indicates the catalyst system Fe/Ni/Al to have produced higher quality carbon nanotubes than the catalyst system Co/Zn/Al.

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