Borate ester hybrid photothermal nanofluid derived from C3N4/MoS2 catalyzed esterification for efficient organic-inorganic synergistic lubrication

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL Tribology International Pub Date : 2024-08-26 DOI:10.1016/j.triboint.2024.110169

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Abstract

The inferior dispersion stability and simple functionality of MoS₂-based nanofluids restrict their efficient application in lubrication. Herein, a novel nanofluid composed of C₃N₄/MoS₂, 3-isocyanatopropyltrimethoxysilane, and C₃N₄/MoS₂-catalyzed product (polyethylene glycol-borate ester, PEG-BA) was proposed. C₃N₄ nanosheets could induce the formation of regular MoS₂ nanospheres. The resulting C₃N₄/MoS₂ showed excellent catalytic activity for the esterification of PEG-BA. The C₃N₄/MoS₂ @PEG-BA nanofluid exhibited favorable dispersion stability in PEG600 with no stratification for ≥ 82 days. The addition of 3.0 wt% C₃N₄/MoS₂ @PEG-BA nanofluid could significantly reduce friction coefficient (30.7 %) and wear scar diameter (28.9 %). The excellent lubrication properties of the nanofluid are attributed to the synergistic lubrication effect of C₃N₄/MoS₂ and PEG-BA. Furthermore, the nanofluid exhibits remarkable photothermal conversion performance in both oil and air mediums.

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由 C3N4/MoS2 催化酯化衍生的硼酸酯杂化光热纳米流体，用于高效有机-无机协同润滑

基于 MoS2 的纳米流体的分散稳定性较差且功能简单，这限制了其在润滑领域的有效应用。本文提出了一种由 C3N4/MoS2、3-异氰酸丙基三甲氧基硅烷和 C3N4/MoS2 催化产物（聚乙二醇硼酸酯，PEG-BA）组成的新型纳米流体。C3N4 纳米片可诱导形成规则的 MoS2 纳米球。生成的 C3N4/MoS2 在 PEG-BA 的酯化过程中表现出优异的催化活性。C3N4/MoS2 @PEG-BA 纳米流体在 PEG600 中表现出良好的分散稳定性，≥ 82 天内没有分层现象。添加 3.0 wt% 的 C3N4/MoS2 @PEG-BA 纳米流体可显著降低摩擦系数（30.7%）和磨损痕直径（28.9%）。纳米流体优异的润滑性能归功于 C3N4/MoS2 和 PEG-BA 的协同润滑效应。此外，该纳米流体在油和空气介质中均表现出显著的光热转换性能。

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.