Yazar "Ali, Mohamed Kamal Ahmed" seçeneğine göre listele

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    A review of recent advances of ionic liquids as lubricants for tribological and thermal applications
    (SAGE PUBLICATIONS, 2022) Ali, Mohamed Kamal Ahmed; Abdelkareem, Mohamed A. A.; Chowdary, Krishna; Ezzat, Muhammad Fawzy; Kotia, Ankit; Jiang, Hua
    The novel characteristics of ionic liquids (ILs) led to an improved tribological and thermal performance. This article discusses current progress in developing ILs as neat lubricants or additives in lube oils, with a focus on ILs chemistry, synthesis, miscibility, and other relevant rheological, thermal, and tribological properties at macro to nanoscales. This article also introduces a review of lubrication mechanisms based on the tribofilm formed on the rubbing interfaces owing to tribochemical reactions among the ILs, base oil, and solid bodies, which shows key insights into anti-wear properties. ILs exhibited superior anti-wear properties compared to fully formulated oils. Notably, there was no symmetry between the friction results of ILs and their wear counterpart. Furthermore, the main challenges to further improve ILs performance for tribological applications are highlighted. Eventually, prospects for ILs tribology are suggested, which will guide the development and synthesis of ILs-based lubricants for tribological applications.
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    A review of the tribological properties of nanoparticles dispersed in bio-lubricants
    (SAGE PUBLICATIONS, 2022) Abd Elhaseeb, Diaa M.; Ali, Mohamed Kamal Ahmed; Ezzat, Muhammad Fawzy; Mourad, Mohammad Aboulfotoh
    Mineral oil resources are dwindling and the mineral-based lubricants are not compatible with the environment, and thus there is great interest in replacing them with bio-based lubricants. Automotive engines are an important application for bio-lubricants. In this context, this review investigates recent advances and research gaps in automotive-related applications of bio-based lubricants. The main objective of the current article is to review the tribological and thermophysical properties of nanoparticles in bio-oils, which could be used as a reference in the future development of bio-lubricants. The various nanomaterials, concentrations, surfactants, and mixing techniques have been presented. The key mechanisms which can result in superior tribological and thermal behavior of bio-lubricants are explained. Studies on the tribo-chemical reactions and between nano-additives and bio-oils are included in this review. It was reported that the tribological and thermophysical performance of bio-oils could be improved especially after adding nanomaterials according to the recent studies results. Furthermore, the major challenges for developing bio-lubricants performance are illustrated. Our present review assists in providing a basis to select bio-oils, nano-additives, and chemical processing according to their tribological properties.