Facile Fabrication of Magnesium Oxide with Different Morphology

Wang, Guosheng; Zhang, Feiyan; Wang, Kang Jun; Kong, Changyi

doi:10.14233/ajchem.2013.13987

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The XRD pattern is employed to reveal the evolution of the abrasive debris from MgO 0.10 /LiTFSI 10 under superlubricity. Compared with the MgO additives, several different diffraction peaks at (001), (011), (012), and (110) are observed for the abrasive debris (Figure a), which well matchs the crystal structures of Mg(OH) 2 (JCPDS No. 82-2453); it suggests that partial MgO does react with water to form Mg(OH) 2 during friction.…”

Section: Results and Discussionsupporting

confidence: 68%

Highly Concentrated Electrolyte Superlubricants Enhanced by Interfacial Water Competition Around Chemically Active MgO Additives

Liang,

Zou,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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The low concentration of water-based lubricants and the high chemical inertness of the additives involved are often regarded as basic norms in the design of liquid lubricants. Herein, a novel liquid superlubricant of an aqueous solution containing a relatively high concentration of salt, lithium bis-(trifluoromethanesulfonyl)imide (LiTFSI), is reported for the first time, and the superlubricity stability and load-bearing capacity of the optimized system (MgO 0.10 /LiTFSI 10 ) are effectively strengthened by the addition of only trace (0.10 wt %) water− chemically active MgO additives. It demonstrates higher applicable loads, lower COF (∼0.004), and stability relative to the base solution. Only a trace amount of MgO additive is needed for the superlubricity, which makes up for the cost and environmental deficiencies of LiTFSI 10 . The weak interaction region between free water and the outer-layer water of Li + hydration shells becomes a possible ultralow shear resistance sliding interface; the Mg(OH) 2 layer, generated by the reaction of MgO with water, further creates additional weakly interacting interfaces, leading to the formation of an asymmetric contact between the clusters/particles within the hydrodynamic film by moderating the competition between interfacial water and free water, thus achieving high load-bearing macroscopic superlubricity. This study deepens the contribution of electrolyte concentration to ionic hydration and superlubricity due to the low shear slip layer formed by interfacial water competition with water-activated solid additives, providing new insights into the next generation of high load-bearing water-based liquid superlubricity systems.

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