The present work addresses the use of synergistic blends of two different types of nanomaterials (spherical particles and lamellar sheets) as additives for coconut oil-based grease formulation to provide the energy-efficient and sustainable alternative to conventional grease. The spherical SiO₂ nanoparticles are separately blended with 2D lamellar sheets of MoS₂ and graphene oxide (GO) in variable ratio and probed their synergistic effects for enhancement of physicochemical and lubrication properties. The SiO₂ nanoparticles, MoS₂, and GO nanosheets are prepared by modified sol–gel, hydrothermal reduction, and Hummer's methods, respectively. The 0.05 wt% nanomaterials blends of MoS₂/SiO₂ (30:70) and GO/SiO₂ (50:50) as optimised doses furnished the maximum reduction in the friction and wear. The combination of rolling friction and low shear properties using the synergistic blend of the spherical nanoparticles (SiO₂) and nanosheets (MoS₂ and GO) showed significant improvement in tribological properties. The optimised blends of nanoadditives, that is, MoS₂/SiO₂ and GO/SiO₂ conserved the energy by 20% and 19%, respectively. These findings suggest that the use of synergistic blends of variable nanomaterials to vegetable oil-based lubricants can pave a direction for new generation lubricant formulation, where environmental sustainability and energy conservation are on prime importance.

中文翻译：

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纳米结构 MoS2/SiO2 和 GO/SiO2 二元体系作为椰子油衍生润滑脂添加剂的协同效应：增强物理化学和润滑性能

目前的工作解决了使用两种不同类型纳米材料（球形颗粒和层状片）的协同混合物作为椰子油基润滑脂配方的添加剂，以提供节能和可持续的传统润滑脂替代品。球形 SiO ₂纳米粒子分别与二维层状 MoS ₂和氧化石墨烯 (GO) 以可变比例混合，并探讨了它们对增强物理化学和润滑性能的协同作用。SiO ₂纳米颗粒、MoS ₂和GO 纳米片分别通过改性溶胶-凝胶、水热还原和Hummer 方法制备。MoS ₂ /SiO ₂的 0.05 wt% 纳米材料混合物(30:70) 和 GO/SiO ₂ (50:50) 作为优化剂量提供了最大程度的减少摩擦和磨损。使用球形纳米颗粒 (SiO ₂ ) 和纳米片 (MoS ₂和 GO)的协同混合物，滚动摩擦和低剪切性能的结合显示出摩擦学性能的显着改善。纳米添加剂的优化混合物，即 MoS ₂ /SiO ₂和 GO/SiO ₂分别节省了 20% 和 19% 的能量。这些发现表明，在植物油基润滑剂中使用可变纳米材料的协同混合物可以为新一代润滑剂配方铺平道路，其中环境可持续性和节能是最重要的。