Thermal decomposition of dibenzyl disulphide and its load-carrying mechanism

Plaza, S.; Mazurkiewicz, B.; Gruziński, R.

doi:10.1016/0043-1648(94)90103-1

Cited by 32 publications

(26 citation statements)

References 17 publications

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“…In contrast to chemical vapor techniques, where S and Se vapors have almost the same reactivity, the reactivity of the precursors is an important parameter in colloidal syntheses. In order to ensure that both the S and Se precursors decompose and incorporate into the crystal structure, the reaction temperature was set above the precursors' decomposition temperature, which is $170 C for DBS in organic solutions 29 and under 240 C for DBSe. 14 The syntheses yielded nanoowers with similar morphology and size (100-200 nm) for all the compositions of 0, 20, 50, 80, and 100% S in the feed ratio (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Understanding the formation mechanism and the 3D structure of Mo(S_xSe_1−x)₂ nanoflowers

2015

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Section: Resultsmentioning

confidence: 99%

Understanding the formation mechanism and the 3D structure of Mo(S_xSe_1−x)₂ nanoflowers

2015

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“…A significant amount of work has already been carried out to examine the tribological properties of these types of additives. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] In addition, the surface chemistry of a wide range of sulfur-containing molecules has been examined on transition metals in order to try to understand the way in which they operate as hydrodesulfurization catalysts, and much of what has been learnt in the latter area will facilitate tribological understanding. [31][32][33][34][35][36] Another area in which the chemistry of sulfur-containing molecules is important, in particular its reaction with iron, is to understand and ultimately prevent the corrosion of oil pipelines by the sulfur contaminants present in oil.…”

Section: Introductionmentioning

confidence: 99%

Surface Chemistry and Extreme-Pressure Lubricant Properties of Dimethyl Disulfide

et al. 1998

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The growth kinetics of a film formed by the thermal decomposition of dimethyl disulfide on an iron foil are measured using a microbalance where the growth kinetics are parabolic (film thickness X varies with time as X 2 ∝ t) at high reaction temperatures and pressures, indicating that it is limited by diffusion through the film. The activation energy for this process is 54.5 ( 0.5 kcal/mol. The growth rate becomes linear as the reaction temperature and/or reactant pressure is lowered, indicating that, under these circumstances, the reaction rate is limited by thermal decomposition of dimethyl disulfide at the growing interface. The activation energy for thermal decomposition at the interface is found to be 37.6 ( 0.7 kcal/mol, and a half-order kinetics pressure dependence for the surface reaction rate is found consistent with a reaction limited by the rate of dimethyl disulfide dissociation. Analysis of the resulting film using Raman and X-ray photoelectron spectroscopies as well as X-ray diffraction reveal the formation of FeS, which may be slightly nonstoichiometric. This film is similar to that formed by methanethiol, suggesting that they may both initially form a surface thiolate species that further reacts to form FeS. The half-order reaction kinetics noted above are consistent with this. Measurement of dimethyl disulfide as an extreme-pressure (antiseizure) additive reveals a plateau at an applied load of ∼4000 N in the seizure load versus additive concentration curve. It has previously been suggested that the plateau corresponds to the load at which the interface reaches the melting point of the solid lubricant layer (in this case proposed to be FeS). Estimation of the interfacial temperature using a method developed previously yields an interfacial temperature of ∼1480 K, in good agreement with the melting point of FeS.

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“…The friction coefficients of T321 are between 0.1 and 0.2 different loads and the friction curves are more stable. The reason is that the iron mercaptide and FeS films were formed by T321 on the interfaces rapidly [15] .…”

Section: Tribological Testingmentioning

confidence: 99%

“…Many studies have been performed on the action mechanism of the organo-sulphur on iron [14][15][16][17][18][19][20][21] . A general theory of the tribological chemistry of organo-sulphur proposed that the sulfides decomposed via S-S bond cleavage to form iron mercaptide species on the rubbing surface under mild wear conditions, which is the effective anti-wear (AW) layer.…”

Section: Introductionmentioning

confidence: 99%

Preparation and action mechanism of inclusion complex of β-cyclodextrin and sulfurized isobutylene as additives in solution of polyethylene glycol-600

Guan

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The inclusion complex of β-cyclodextrin (β-CD) and sulfurized isobutylene (T321) was prepared with a co-precipitation method. The tribological properties of the complex with different concentrations were investigated by a four-ball tester in the solution of polyethylene glycol-600 (PEG-600). The experimental results suggest that the complex exhibits better anti-friction and anti-wear properties than β-CD under different load conditions. The tribo-system shows the least friction coefficient when the concentration of the complex is 0.8%. During the friction process, the complex was decomposed into various molecular fragments and the T321 molecules were released onto the friction interface to provide effective lubrication. The XPS analytical results on the worn surfaces reveal that sulfide film formed by the released T321 plays a major role, and the iron alkoxide and carbon deposition films formed by the β-CD fragments have better anti-friction effect on the sulfide film surface. The interactions of different films result in the formation of a mixed boundary lubrication film.

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Thermal decomposition of dibenzyl disulphide and its load-carrying mechanism

Cited by 32 publications

References 17 publications

Understanding the formation mechanism and the 3D structure of Mo(S_xSe_1−x)₂ nanoflowers

Understanding the formation mechanism and the 3D structure of Mo(S_xSe_1−x)₂ nanoflowers

Surface Chemistry and Extreme-Pressure Lubricant Properties of Dimethyl Disulfide

Preparation and action mechanism of inclusion complex of β-cyclodextrin and sulfurized isobutylene as additives in solution of polyethylene glycol-600

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Thermal decomposition of dibenzyl disulphide and its load-carrying mechanism

Cited by 32 publications

References 17 publications

Understanding the formation mechanism and the 3D structure of Mo(SxSe1−x)2 nanoflowers

Understanding the formation mechanism and the 3D structure of Mo(SxSe1−x)2 nanoflowers

Surface Chemistry and Extreme-Pressure Lubricant Properties of Dimethyl Disulfide

Preparation and action mechanism of inclusion complex of β-cyclodextrin and sulfurized isobutylene as additives in solution of polyethylene glycol-600

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Product

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Understanding the formation mechanism and the 3D structure of Mo(S_xSe_1−x)₂ nanoflowers

Understanding the formation mechanism and the 3D structure of Mo(S_xSe_1−x)₂ nanoflowers