Preparation and tribological properties of stearic acid-modified hierarchical anatase TiO2 microcrystals

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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Lipophilic magnetite nanoparticles coated with stearic acid: A potential green and low cost way to improve thermal stability and tribological properties of fully formulated low viscosity engine oils

Tribology International ◽

10.1016/j.triboint.2020.106209 ◽

2020 ◽

Vol 146 ◽

pp. 106209

Author(s):

André Zuin ◽

T. Cousseau ◽

A. Sinatora ◽

H.E. Toma

Keyword(s):

Thermal Stability ◽

Stearic Acid ◽

Tribological Properties ◽

Magnetite Nanoparticles ◽

Low Cost ◽

Engine Oils ◽

Low Viscosity

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Formation and tribological properties of composite Langmuir–Blodgett films of stearic acid with molybdenum disulfide and amorphous carbon

Russian Journal of Applied Chemistry ◽

10.1134/s1070427217050147 ◽

2017 ◽

Vol 90 (5) ◽

pp. 754-758 ◽

Cited By ~ 1

Author(s):

A. E. Salamianski ◽

V. E. Agabekov

Keyword(s):

Stearic Acid ◽

Molybdenum Disulfide ◽

Amorphous Carbon ◽

Tribological Properties ◽

Langmuir Blodgett ◽

Langmuir Blodgett Films

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Tribological properties of anatase TiO2 sol–gel films controlled by mutually soluble dopants

Tribology Letters ◽

10.1007/s11249-006-9177-6 ◽

2006 ◽

Vol 26 (1) ◽

pp. 19-24 ◽

Cited By ~ 16

Author(s):

Qingyuan Jia ◽

Yujuan Zhang ◽

Zhishen Wu ◽

Pingyu Zhang

Keyword(s):

Tribological Properties ◽

Sol Gel ◽

Anatase Tio2 ◽

Tio2 Sol ◽

Sol Gel Films

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Tribological study of TiO2 nanoparticles modified with stearic acid as additives in lithium grease

Industrial Lubrication and Tribology ◽

10.1108/ilt-03-2021-0060 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Hong Zhang ◽

Sheng Han ◽

Wenjing Hu ◽

Jiusheng Li

Keyword(s):

Surface Modification ◽

Electron Microscope ◽

Stearic Acid ◽

Metal Nanoparticles ◽

Tio2 Nanoparticles ◽

Tribological Properties ◽

Lithium Grease ◽

Content Type ◽

Prepared Nanoparticles ◽

Steel Balls

Purpose The purpose of this paper is to improve the properties of metal nanoparticles which are easy to agglomerate and hard to disperse evenly, thus limiting the application of metal nanoparticles in grease. A novel technology was proposed for modifying metal oxide to improve the dispersibility of nanoparticles. Design/methodology/approach SA-TiO2 nanoparticles were synthesized using an in-situ esterification method followed by surface modification with stearic acid. The microstructure of the nanoparticles was characterized by scanning electron microscope, transmission electron microscope and Fourier transform infrared spectroscopy and their thermal stability was evaluated by thermogravimetric analyzer. The tribological properties of the SA-TiO2 nanoparticles as additives in lithium grease were evaluated with a four-ball tester and TE77 reciprocating friction tester. The worn surfaces of the steel balls were investigated by EDS and XPS. Findings The prepared nanoparticles can be well dispersed in the lithium grease and possess much better tribological properties compared to traditional nanoparticles. The results indicated that the excellent tribological performance of SA-TiO2 was attributed to the chemical reaction film composing of Fe2O3, iron oxide and other organic compounds. Originality/value This paper provides a method to prevent the agglomeration of nano-TiO2 by surface modification with stearic acid. And the prepared nanoparticles can effectively improve the tribology performance of lithium grease.

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Shear Strength and Tribological Properties of Stearic Acid Films—Part I: On Glass and Aluminum-Coated Glass

Journal of Tribology ◽

10.1115/1.2920854 ◽

1992 ◽

Vol 114 (1) ◽

pp. 150-158 ◽

Cited By ~ 29

Author(s):

R. S. Timsit ◽

C. V. Pelow

Keyword(s):

Shear Strength ◽

Film Thickness ◽

Stearic Acid ◽

Tribological Properties ◽

Contact Stress ◽

Frictional Force ◽

Aluminum Film ◽

Langmuir Blodgett ◽

Coated Glass ◽

Sliding Interfaces

The mechanical shear strength of dry and lubricated interfaces is evaluated by measuring the frictional force during sliding of a hemispherical pin in contact with a flat slide. The solids investigated include bare glass and aluminum-coated glass and interfaces are generated from pairings of these materials. Lubrication is obtained by depositing a stearic acid Langmuir-Blodgett layer on the slide. Shear strength is measured at contact stresses ranging from ~ 0.05 to 0.8 GPa and at a sliding speed of 60 μm s−1. The shear strength of dry interfaces is found to increase with contact stress, and increases slightly with aluminum film thickness. Because stearic acid adheres to glass and aluminum, the shear strength of lubricated interfaces originates from the interaction of two stearic acid layers generated from molecular redistribution over the surfaces during sliding. For lubricated interfaces, the shear strength increases nearly linearly with contact stress, in agreement with the results of earlier work. The shear strength of stearic acid is found to depend slightly on the combination of sliding materials. Lubricant durability is found to be largest in glass/glass sliding interfaces.

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