Alkali-Assisted Hydrothermal Exfoliation and Surfactant-Driven Functionalization of h-BN Nanosheets for Lubrication Enhancement,ACS Applied Nano Materials

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Alkali-Assisted Hydrothermal Exfoliation and Surfactant-Driven Functionalization of h-BN Nanosheets for Lubrication Enhancement
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-09-13 , DOI: 10.1021/acsanm.1c01713
Sangita Kumari _{1,

2,

3} , Ajay Chouhan _{1,

2} , Om P. Sharma ₁ , Sherif Abdulkader Tawfik _{4,

5} , Michelle J. S. Spencer _{6,

7} , Suresh K. Bhargava ₈ , Sumeet Walia ₃ , Anjan Ray _{1,

2} , Om P. Khatri _{1,

2}

Affiliation

Intrinsic low shear strength, excellent mechanical properties, and high thermal conductivity of two-dimensional h-BN nanomaterials make them promising alternatives to conventional metal-/phosphorus-/sulfur-based additives for the development of eco-friendly lubricant formulation. However, the poor dispersibility of h-BN nanomaterials in lubricating oils is a major challenge. Herein, a facile approach of strong alkali-assisted hydrothermal exfoliation and defect-sensitive etching of h-BN powder is demonstrated. The cetyltrimethylammonium bromide (CTAB) is grafted on the active and polar sites of h-BN nanosheets (h-BNNSs). DFT calculations, along with FTIR and XPS results, confirmed the synthesis of h-BNNS-CTAB, which showed good dispersibility in SN-150 mineral lube base oil. The uninterrupted supply of highly dispersible minute dose of h-BNNS-CTAB (0.003 wt %) to tribo interfaces of steel balls improved the lubrication properties of lube oil by decreasing friction (34%) and wear volume (75%). The enhanced tribo-performance is attributed to low shear strength arising from weakly stacked atomic lamellae in h-BNNS-CTAB and the tribo-induced deposition of h-BN lamellae on the contact interfaces of steel balls. The present work proposes a novel strategy for developing h-BNNS-based high-performance lubricant formulation, which can effectively minimize frictional energy and material losses.

中文翻译：

h-BN纳米片的碱辅助水热剥离和表面活性剂驱动的功能化增强润滑

二维h - BN纳米材料固有的低剪切强度、优异的机械性能和高导热性使其成为开发环保润滑剂配方的常规金属/磷/硫基添加剂的有前途的替代品。然而，h- BN纳米材料在润滑油中的分散性差是一个主要挑战。在此，展示了一种简便的强碱辅助水热剥离和h -BN 粉末缺陷敏感蚀刻的方法。十六烷基三甲基溴化铵 (CTAB) 接枝在h -BN 纳米片 ( h -BNNSs)的活性和极性位点上。DFT 计算以及 FTIR 和 XPS 结果证实了h -BNNS-CTAB，在SN-150矿物润滑油基础油中表现出良好的分散性。将高度分散的微量h -BNNS-CTAB (0.003 wt%)不间断地供应到钢球的摩擦界面，通过降低摩擦 (34%) 和磨损量 (75%) 来改善润滑油的润滑性能。增强的摩擦性能归因于h -BNNS-CTAB 中弱堆叠原子片层产生的低剪切强度以及h -BN 片层在钢球接触界面上的摩擦诱导沉积。目前的工作提出了一种开发基于h -BNNS 的高性能润滑剂配方的新策略，可以有效地减少摩擦能和材料损失。

更新日期：2021-09-24

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