title: Tribochemical reaction dynamics of molybdenum dithiocarbamate on nascent iron surface: a hybrid quantum chemical/classical molecular dynamics study.
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.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-11-1302 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Tasuku
authors.initials: T
authors.lastname: Onodera
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Morita
authors.forename: Ai
authors.initials: A
authors.lastname: Suzuki
authors.forename: Riadh
authors.initials: R
authors.lastname: Sahnoun
authors.forename: Michihisa
authors.initials: M
authors.lastname: Koyama
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Tsuboi
authors.forename: Nozomu
authors.initials: N
authors.lastname: Hatakeyama
authors.forename: Akira
authors.initials: A
authors.lastname: Endou
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Takaba
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Del Carpio
authors.forename: Ramesh C
authors.initials: RC
authors.lastname: Deka
authors.forename: Momoji
authors.initials: M
authors.lastname: Kubo
authors.forename: Akira
authors.initials: A
authors.lastname: Miyamoto