In redox-transmetallation protolysis (RTP) reactions in tetrahydrofuran (thf) between excess scandium or cerium metal, Hg(C6F5)2 and 3,5-dimethylpyrazole (Me2pzH) silicone greased Schlenk flasks, formation of the 3,5-dimethyl-1-pyrazolyl(dimethyl)siloxide (Me2pzSiMe2O) ligand was observed. Thus former reaction gave [Sc2(Me2pz)4(Me2pzSiMe2O)2] 1 good yield, whilst latter a mixture [Ce4O(Me2pz)9(...

Thermodynamics has historically been used to derive characteristic material properties. In this study, fundamental thermodynamics is applied grease. First-principle formulations of existing properties—heat capacity and storage modulus—and new properties—thermal strain stress coefficients, chemical resistance thermo-chemical decay coefficient—are derived, some which are experimentally determined...

In this paper, the flow dynamics of polymer greases was investigated using micro-particle image velocimetry. Polymer have a different thickener structure, compared to widely used lithium-based greases, and they well-known ability release oil. How these properties affect grease deformation its is corresponding behavior lithium complex with same consistency. Two main tests were carried out, where...

Abstract This paper presents a novel approach to accurately simulate the dynamic characteristics of rack and pinion lifting mechanism while accounting for coupling effect meshing tooth pair stiffness grease in real-world environments. A structure-grease model is established based on deformation coordination conditions meshing. The incorporates term time-varying pinion. By analyzing combined com...

Pencucian komponen mesin dan cuci tangan mekanik merupakan sumber air limbah pada bengkel otomotif. Oli mengandung logam berat termasuk dalam kategori Bahan Berbahaya Beracun (B3), otomotif juga T otal Suspended Solid (TSS) yang dapat menurunkan kualitas sehingga membahayakan ekosistem apabila tidak diolah terlebih dahulu. Berdasarkan latar belakang permasalahan tersebut dibuatlah instalasi sep...

In greased contacts, the complex rheology of a grease, depending on thickener, base oil and additives, becomes key point for understanding controlling evolution friction coefficient at extremely low sliding velocities. Such velocity range (from 0 to few mm/s) is main relevance several issues, such as unstable friction-induced vibrations, which can occur well in case lubricated interfaces. this ...