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Tribochemical Reaction Dynamics of Molybdenum Dithiocarbamate on Nascent Iron Surface: A Hybrid Quantum Chemical/Classical Molecular Dynamics Study

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Abstract:

Using a hybrid quantum chemical/classical molecular dynamics method, we have studied the tribochemical reaction dynamics of molybdenum dithiocarbamate (MoDTC), a commonly used friction modifier in automobile engine oils. MoDTC molecule adsorbed on rubbing nascent iron surface was situated. We firstly investigated the dynamic behavior of MoDTC molecule on the rubbing Fe(001) surface. During the friction simulation, the elongation of Mo–O bonds was observed, forming the Mo2S4 and thiocarbamic acid molecules. To unveil the detailed mechanism of this bond elongation, the electronic states of the MoDTC molecule and Fe(001) surface were computed, and the catalytic effects of Fe(001) surface to the molecule was found. We also found that extreme friction would influence the complete Mo–O bond dissociation. By using the hybrid quantum chemical/classical molecular dynamics method, we successfully simulated the tribochemical reaction dynamics of MoDTC as a friction modifier and obtained the influences of nascent iron surface and friction on its chemical reaction.
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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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