Low Friction of Graphene Oxide Aggregates in Lubricant Oil between a Steel Ball and Glass Disk under Boundary Lubrication

被引：10

作者：

Kinoshita, Hiroshi ^{[1
]}

Okamoto, Tatsuya ^{[1
]}

Hirai, Yutaro ^{[1
]}

Sugano, Koichi ^{[1
]}

Naohiro, Matsumoto ^{[1
]}

机构：

[1] Univ Hyogo, Grad Sch Engn, Dept Mech Engn, Himeji, Hyogo 6712280, Japan

来源：

ACS OMEGA | 2022年

关键词：

REDUCTION;

D O I：

10.1021/acsomega.2c04181

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Previously, isolated nanocarbons in lubricating oils were considered essential for good lubrication. However, we observed that graphene oxide (GO) aggregates in lubricating oil have lower frictional properties than isolated dispersed GO. The GO was dispersed in poly alpha-olefin (PAO) using alkylamine at different ratios of GO and alkylamine, or it was heated at different temperatures to synthesize high-and low-dispersible GO-dispersed PAO. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy measure-ments showed that low-dispersible modified GOs retained many of the original GO chemical and structural features. Macrotribological tests between a steel ball and glass disk in GO-dispersed oil were conducted with a load of 5 N under boundary lubrication. The friction interface was observed in situ using an optical microscope. the low-dispersible GO-dispersed PAO, many GO aggregates were observed through optical microscopy. Surprisingly, the friction coefficients decreased when the GO aggregates entered the friction interface and covered the contact area. The low-dispersible dispersed PAO using alkylamine had the lowest friction coefficient of 0.05, as the GO aggregates covered the contact area. From microtribological tests with a load of 0.8 mN as well, it is assumed that the low friction of the GO aggregates originates due to sliding between the weakest shear layers in the aligned multiple GO layers.

引用

页码：40983 / 40989

页数：7

共 26 条

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