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<p>A simple and nonsynthetic way of bicomponent supramolecular gel lubricants was prepared by adding carboxylic acid and sodium organosulfur oxy-salts with varying chain lengths and saturation degrees into white oil (WO). The gelling properties have shown that the bicomponent supramolecular gelator with longer alkyl chains and higher saturation, such as stearic acid and sodium dodecyl sulfate (SA-SDS), possessed better gelling properties. SA self-assembles to helical fibers, and SDS enhances fiber cross-linking via the noncovalent interaction with SA, leading to the formation of three-dimensional networks with significantly increased rigidity. Tribological data show that SA-SDS gel reduces wear scar diameter and friction coefficient by approximately 25 and 24% compared to WO. And the gel system of SA-SDS in WO has better anti-friction and anti-wear performances than the sol system. This is because the multilayer tribofilm consisting of oxide layers, carbonaceous species, and organic films is formed at the interface, significantly improving lubrication. These findings provide insights into the design of supramolecular gel-based lubricants for enhanced friction and wear control.</p>

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Gelling Properties, Mechanisms, and Lubricating Performances of Sodium Carboxylate-Based Bicomponent Supramolecular Gel Lubricants

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Zhuoli Ding,
  • Jiapeng Zhou,
  • Xiaoping Bao,
  • Minghuan Wang,
  • Xiaodong Hu,
  • Ruochong Zhang,
  • Xuefeng Xu

摘要

A simple and nonsynthetic way of bicomponent supramolecular gel lubricants was prepared by adding carboxylic acid and sodium organosulfur oxy-salts with varying chain lengths and saturation degrees into white oil (WO). The gelling properties have shown that the bicomponent supramolecular gelator with longer alkyl chains and higher saturation, such as stearic acid and sodium dodecyl sulfate (SA-SDS), possessed better gelling properties. SA self-assembles to helical fibers, and SDS enhances fiber cross-linking via the noncovalent interaction with SA, leading to the formation of three-dimensional networks with significantly increased rigidity. Tribological data show that SA-SDS gel reduces wear scar diameter and friction coefficient by approximately 25 and 24% compared to WO. And the gel system of SA-SDS in WO has better anti-friction and anti-wear performances than the sol system. This is because the multilayer tribofilm consisting of oxide layers, carbonaceous species, and organic films is formed at the interface, significantly improving lubrication. These findings provide insights into the design of supramolecular gel-based lubricants for enhanced friction and wear control.