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Research Papers

Tribological Properties of Stearic Acid Modified Multi-Walled Carbon Nanotubes in Water

[+] Author and Article Information
Yitian Peng

Jiangsu Key Laboratory of Design
and Manufacture of Micro/Nano
Bio-Medical Instruments,
School of Mechanical Engineering,
Southeast University,
Nanjing 211189, China;
State Key Laboratory of
Mechanical Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: yitianpeng@seu.edu.cn

Zhonghua Ni

Jiangsu Key Laboratory of Design
and Manufacture of Micro/Nano
Bio-Medical Instruments,
School of Mechanical Engineering,
Southeast University,
Nanjing 211189, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 3, 2011; final manuscript received September 10, 2012; published online December 20, 2012. Assoc. Editor: Hong Liang.

J. Tribol 135(1), 012001 (Dec 20, 2012) (5 pages) Paper No: TRIB-11-1122; doi: 10.1115/1.4007676 History: Received July 03, 2011; Revised September 10, 2012

The oxidized multiwalled carbon nanotubes (MWCNTs) were modified with stearic acid (SA) molecules. The SA-modified MWCNTs were characterized with scanning electron microscopy, transmission electron microscopy, and Fourier transform-infrared spectroscopy. The tribological properties of the oxidized and SA-modified MWCNTs as additives in water were comparatively investigated with a four-ball tester. The results showed the SA-modified MWCNTs in water have better tribological properties including friction reduction and antiwear than oxidized MWCNTs. The possible mechanism of SA-modified MWCNT as an additive in water was discussed. This research provides the opportunity for the lubricant application of MWCNTs.

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References

Figures

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Fig. 1

Raman spectrum and HRTEM image of oxidized MWCNTs

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Fig. 2

SEM image of oxidized MWCNTs (left) and SA-modified MWCNTs (right)

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Fig. 3

Infrared spectrum of oxidized MWCNTs

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Fig. 4

Infrared spectrum of steric acid and SA-modified MWCNTs

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Fig. 5

TEM image of (a) oxidized MWCNTs (b) single SA-modified MWCNT

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Fig. 6

Friction coefficient as a function of concentrations (200 N)

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Fig. 7

The wear scar diameter as a function of MWCNT concentration (200 N)

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Fig. 8

Friction coefficient as a function of load

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Fig. 9

The wear scar diameter as a function of load

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Fig. 10

The optical image (a) and SEM image (b) of SA-modified MWCNTs

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Fig. 11

SEM image of wear scar lubricated with oxidized MWCNT and SA-modified MWCNTs

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