Article
Materials Science, Multidisciplinary
Filip Ilie, Andreea-Catalina Cristescu
Summary: This study investigates the tribological properties of a lubricating oil-MoS2 nanoparticles mixture under different friction conditions. The results show that the nanoparticles form a protective and lubricating layer, significantly improving the performance of the friction pair.
Article
Engineering, Mechanical
Zhixiang Li, Kunhong Hu, Yong Xu, Enzhu Hu, Xianguo Hu
Summary: A novel method to improve the dispersion and lubrication of nano-MoS2 in ester oil was proposed. The synthesized S-MoS2/sericite catalyst remained in DBA with a high content and the dispersion system showed good long-term stability. The dispersion system reduced friction and wear by forming a lubricating film or embedding in the soft surface under different conditions.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Tomas Hudec, Tomas Roch, Maros Gregor, Lubomir Orovcik, Marian Mikula, Tomas Polcar
Summary: Molybdenum disulphide (MoS2) is known for its exceptional tribological properties in inert and high vacuum environments, but rapidly degrades in humid and high temperature conditions. Mo-S-N coatings with nitrogen content of 31 at.% exhibited the best overall tribological performance in various testing conditions, surpassing pure MoS2 films.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Qiulong Gao, Shuwen Liu, Kaiming Hou, Xiaonan Miao, Zhangpeng Li, Jinqing Wang
Summary: Environment-friendly and sustainable deep eutectic solvents (DESs) are regarded as a new type of lubricant. MoSx/rGO nanohybrids were synthesized and used as lubricant additive to improve the tribological performance of DES. The nanohybrids demonstrated excellent dispersibility in DES. Tribological tests showed that adding 1.5 wt% MoSx/rGO to DES resulted in the best lubrication performance for steel tribopair, reducing friction by 31.2% and wear by 88.2%, attributed to the synergistic effect between MoSx/rGO nanohybrid and DES. The attachment of nanohybrids to the friction interface, which triggered the formation of a robust tribofilm, was responsible for the superior lubricating properties of DES containing nanohybrids. These findings offer new insights for enhancing the tribological performance of DES by incorporating effective additives.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Kunpeng Wang, Huaichao Wu, Hongdong Wang, Yuhong Liu, Lv Yang, Limei Zhao
Summary: The study prepared molybdenum-dotted nanoplatelets using an aqueous miscible organic solvent treatment method, enhancing the specific surface area and dispersion of attapulgite. The nanoplatelets showed excellent tribological properties and self-repairing ability in an oil-based lubricant system.
Article
Chemistry, Multidisciplinary
Kaifeng Zhang, Lixia Huo, Junqin Duan, Xiaoying Lu, Xuehu Men, Cailing Xu, Hui Zhou
Summary: The morphology of molybdenum disulfide (MoS2) nanowires has a significant impact on the tribological performance of lubricant. This study found that adding 1.0 wt% MoS2 NWs to perfluoropolyether (PFPE) base oil can significantly improve friction and anti-wear properties under high vacuum conditions. The unique nanowire morphology and good dispersion of MoS2 NWs in PFPE contribute to the minimal friction coefficient and wear scar diameter achieved.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Engineering, Mechanical
Ahmed Nabhan, Ahmed Rashed, Nouby M. Ghazaly, Jamil Abdo, M. Danish Haneef
Summary: The addition of Al2O3 nanoparticles can significantly improve the tribological properties of lithium grease, reducing the coefficient of friction and wear scar width by approximately 57.9% and 47.5% respectively.
Article
Engineering, Mechanical
Min Ji, Shuhai Liu, Huaping Xiao, Haoyang Li
Summary: This paper investigated the tribological behavior of two synthesized microcapsules filled with ionic liquids as smart tribological additives for water-based drilling mud. The experimental results showed that both microcapsules effectively reduced friction, with a significant decrease in coefficient of friction. The study also demonstrated the correlation between microcapsule responses and load stimuli, suggesting the potential for large-scale applications of smart lubrication.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Nurul Athirah Ismail, Nurin Wahidah Mohd Zulkifli, Zaira Zaman Chowdhury, Mohd Rafie Johan
Summary: The performance of lubricants is greatly influenced by additives, and graphene has been receiving attention as anti-wear or anti-friction additives. Introducing graphene-based materials into lubricants can enhance their fundamental characteristics by improving strength and load bearing capability. Pristine graphene is suitable for applications requiring high electrical conductivity, while functionalized graphene is desirable for stable dispersion, such as in lubricant additives.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Engineering, Chemical
Chao Ju, Qin Zhao, Xiaobo Wang
Summary: A series of protic ionic liquids (PILs) containing dibutyldithiophosphate were synthesized and used as lubricant additive in base emulsion. The PILs exhibited superior lubricating properties in emulsion, especially under harsh conditions. The formation of stable protective films on the steel surface was the main reason for their preferable performance.
LUBRICATION SCIENCE
(2023)
Article
Chemistry, Physical
Jose M. Lineira del Rio, Enriqueta R. Lopez, Fatima Garcia, Josefa Fernandez
Summary: The synergistic effects of two functionalized graphene oxides and a phosphonium ionic liquid as additives in a biodegradable ester base oil were investigated. The nanolubricants formulated showed significant reductions in friction coefficients and wear compared to the base oil. Surface repairing, synergistic effect, and tribofilm formation mechanisms were observed through Raman microscopy and roughness analysis.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Nanoscience & Nanotechnology
Xiaozhen Wang, Chencan Li, Kuiliang Gong, Xinhu Wu
Summary: There is an urgent need to develop high-performance tribological additives for water-based lubricants using sustainable methods. In this study, dextran-modified molybdenum sulfide nanoparticles (MoS2-dex NPs) were synthesized through ball-milling under a nitrogen atmosphere. The addition of MoS2-dex in glycerol solution resulted in significant reductions in friction coefficient and wear, and even better tribological performance was achieved when MoS2-dex was combined with graphene oxide (GO). The lubrication mechanism was investigated through FIB-STEM/EDS and XPS, revealing the formation of adsorbed film and tribofilm on the steel substrate, which contributed to the excellent friction reduction and antiwear performances of MoS2-dex and GO in glycerol solution.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hongmei Xie, Yongyi Wei, Bin Jiang, Changping Tang, Chaoyin Nie
Summary: The study evaluated the tribological properties of carbon nanotube/spherical SiO2 nanoparticle combinations as lubricant additives in deionized water, demonstrating their superior performance, particularly the combination with a mass ratio of 0.2:0.3.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Hongdong Wang, Yue Wang, Yuhong Liu, Jun Zhao, Jinjin Li, Qiang Wang, Jianbin Luo
Summary: Layered double hydroxide (LDH) is a natural mineral that can also be synthetically prepared, known for its unique crystal structure and diverse properties. Research showed that the flower-like LDH sample exhibited the best tribological performance among LDH samples with different morphologies, demonstrating potential for improving lubrication systems.
Article
Engineering, Mechanical
Junhua Zhao, Guangbin Yang, Yujuan Zhang, Shengmao Zhang, Chunli Zhang, Chuanping Gao, Pingyu Zhang
Summary: The three different morphologies of CuO nanostructures showed excellent friction-reducing and anti-wear properties as water-based lubricant additives, and improvements in tribological properties can be achieved through technical enhancements.
Article
Energy & Fuels
Fabian Schwack, Fabian Halmos, Matthias Stammler, Gerhard Poll, Sergei Glavatskih
Summary: The study tested two types of ball bearings with an outer diameter of 750 mm to understand the challenges of oscillating motions for pitch bearings. Experimental findings revealed that a comparatively small amount of consecutive cycles can lead to severe wear, and a new type of bearing showed less wear under selected operating conditions.
Article
Nanoscience & Nanotechnology
Yihui Dong, Mian Gong, Faiz Ullah Shah, Aatto Laaksonen, Rong An, Xiaoyan Ji
Summary: This study investigated the impact of a phosphonium-based ionic liquid on the SERS performance, demonstrating that the IL can enhance the SERS performance of Cytochrome c on TiO2 nanotube arrays by improving ionic conductivity and electrostatic interactions in the system.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Inorganic & Nuclear
Olga Loseva, Tatyana A. Rodina, Faiz Ullah Shah, Anton Smolentsev, Oleg N. Antzutkin, Alexander Ivanov
Summary: The crystal structures and thermal behavior of two new crystalline dithiocarbamato-chlorido complexes of mercury(II) were investigated. One neutral complex consists of two doubly-bridged binuclear molecules, while the other ionic complex comprises a tetranuclear cation and a binuclear anion.
INORGANICA CHIMICA ACTA
(2022)
Article
Chemistry, Physical
Yudi Wei, Yihui Dong, Xiaoyan Ji, Faiz Ullah Shah, Aatto Laaksonen, Rong An, Kristina Riehemann
Summary: This study investigates the molecular interaction forces between ionic liquids (ILs) and charged SiO2 microspheres using colloid probe atomic force microscopy (CP-AFM). The results show that the molecular interaction force is influenced by the surface charge and the length of alkyl chains in ILs. These findings provide valuable insights for the development of models and design of ILs-based supercapacitors and battery systems.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Applied
Inayat Ali Khan, Yong-Lei Wang, Faiz Ullah Shah
Summary: There is a growing interest in sustainable and high-performance supercapacitors operating at elevated temperatures. In this study, a biomass-derived nonfluorinated ionic liquid was used as an electrolyte for supercapacitors, and the effects of various factors on the electrode surfaces were investigated. The results showed that the specific capacitance significantly increased with increasing temperature and potential window. Furthermore, atomistic computations revealed the relationship between the distribution of anions on the carbon electrode surfaces and the capacitive performance.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Engineering, Mechanical
Rong An, Yudi Wei, Xiuhua Qiu, Zhongyang Dai, Muqiu Wu, Enrico Gnecco, Faiz Ullah Shah, Wenling Zhang
Summary: In this study, the nanofriction and microstructures of ionic liquids (ILs) on uncharged and charged surfaces were investigated using colloid probe atomic force microscopy (AFM) and molecular dynamic (MD) simulations. The results showed that the nanoscale friction force and torsional resonance frequency were affected by the normal load and bias voltage, indicating changes in the contact stiffness and IL layering.
Article
Chemistry, Multidisciplinary
Sourav Bhowmick, Mukhtiar Ahmed, Andrei Filippov, Laura C. Loaiza, Faiz Ullah Shah, Patrik Johansson
Summary: In this study, six phosphate-anion-based alkali metal salts (Li/Na/K) that are liquids at room temperature were reported. These salts exhibit high anodic stabilities and deliver battery performance at elevated temperatures. Solvent-free electrolytes based on these salts could pave the way for new Li/Na/K-battery designs.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Mukhtiar Ahmed, Soniya S. S. Rao, Andrei Filippov, Patrik Johansson, Faiz Ullah Shah
Summary: This study presents five new ionic materials with different structures and properties, including two room temperature ionic liquids, one semi-solid material, and two organic ionic plastic crystals. The nature and strength of ion-ion interactions are found to be influenced by the position of nitrogen atom in the aromatic ligands. Moreover, the electronic structure and flexibility of ions affect the ionic conductivity, and the diffusion of anions is faster than that of the cation but slowed down by strong electrostatic interactions with Li+ in the electrolytes. Overall, by tuning the structure of aromatic anions, this study introduces promising ionic materials for solid and liquid electrolytes in energy storage devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Mukhtiar Ahmed, Sourav Bhowmick, Andrei Filippov, Patrik Johansson, Faiz Ullah Shah
Summary: Five new ionic liquids (ILs) based on n-tetrabutylphosphonium (P-4444)(+) cation and oligoether substituted aromatic carboxylate anions were synthesized. The nature and position of the oligoether chain have an impact on thermal stability, phase behavior, and ion transport. Doping the ILs with Li-salts affects ion diffusion negatively due to stronger ionic interactions and formation of aggregates, primarily between Li+ ions and carboxylate groups of anions. The electrolytes have electrochemical stability windows up to 3.5 V, showing promise for battery applications.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yiqun Su, Tiantian Wang, Fan Zhang, Junsen Huang, Zhehang Zhu, Faiz Ullah Shah, Feng Xu, Rong An
Summary: Surface chemistry plays a critical role in the ion structuring of ionic liquids at the interfaces of electrodes, affecting the overall energy storage performance. The effect of different surface chemical properties on ion structuring was investigated using a functionalized gold colloid probe. The results showed that the ion structuring of the ionic liquid was more pronounced on the -COOH-terminated surface compared to the -NH2 surface, leading to a more sensitive electrochemical response and faster capacitive process.
Article
Chemistry, Physical
Xin Wang, Mengjie Zhang, Licheng Li, Faiz Ullah Shah, Rong An
Summary: Monitoring volatile organic compounds (VOCs) is important in various fields. Ionic liquids (ILs) have shown potential as sensing materials for VOCs. This study thoroughly investigates the gas-sensing ability of fluorine-free ILs and the factors affecting their response. The supported [P6,6,6,14][MEEA] IL exhibits the highest sensing response, which is attributed to its smaller friction coefficient (mu) and more ordered ion layering.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Mechanical
Roman de la Presilla, Johan Leckner, Sergei Glavatskih
Summary: A statistical, energy-based approach is used to experimentally characterize the anti-fretting ability of different greases. The results show that greases loaded with non-halogenated ionic liquids containing [BOB] and [BMB] anions exhibit excellent boundary lubrication properties and can provide wear-free and low friction performance even under moderate pressure and partially covered contact area. This discovery is significant for the development of anti-fretting ionic greases.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Energy & Fuels
Gaurav Tatrari, Chetna Tewari, Mayank Pathak, Diksha Bhatt, Manoj Karakoti, Sandeep Pandey, Deewan Singh Uniyal, Faiz Ullah Shah, Nanda Gopal Sahoo
Summary: Researchers developed a method to prepare 3D graphene hydrogel (3DGH) and its bimetal composite (3DGHMC) with tungsten trioxide (WO3) and manganese dioxide (MnO2). The structure of 3DGH and its composite was confirmed by advanced characterization techniques, and the performance of two symmetric devices and one asymmetric device was analyzed by various electrochemical tests. The asymmetric device showed high capacitance, energy density, and power density, and demonstrated good stability during charging-discharging cycles.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Sourav Bhowmick, Gaurav Tatrari, Andrei Filippov, Patrik Johansson, Faiz Ullah Shah
Summary: This study presents ion transport measures and details, as well as physico-chemical and electrochemical properties of a small set of structurally flexible pyrrolidinium (Pyrr) and morpholinium (Morph) cation-based ionic liquids (ILs), all with oligoether phosphate-based anions. The Pyrr-based ILs show more promise as high-temperature supercapacitor electrolytes, with faster diffusion rates for both the anions and cations, compared to the Morph-based ILs. These ILs exhibit high thermal stabilities, low glass transition temperatures, and wide electrochemical stability windows, but moderate ionic conductivities. At 90°C, a specific capacitance of 164 F g(-1), a power density of 609 W kg(-1), and a specific energy density of 27 W h kg(-1) were achieved in a symmetric graphite supercapacitor.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Energy & Fuels
Gaurav Tatrari, Sourav Bhowmick, Andrei Filippov, Rong An, Faiz Ullah Shah
Summary: In this study, the electrochemical and charge storage performance of a fluorine-free structurally flexible hybrid pyrrolidinium-based ionic liquid electrolyte (HILE) in a symmetric graphite-based supercapacitor was thoroughly investigated. The HILE showed favorable thermal and ionic conductivity properties, along with notable specific capacitance and energy density values.