Tribochemical Reaction of Benzene on Nascent Steel Surface and Effect of Temperature

Shimotomai, Naoshi; Nanao, Hidetaka; Mori, Shigeyuki

doi:10.2474/trol.7.54

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…The effect of temperature on the adsorption activity of benzene was investigated over the temperature range of 30− 100 °C. 24 From the temperature dependence of the adsorption activity, the activation energy of benzene adsorption on the nascent steel surface was estimated to be 4 kJ/mol. This result suggests that the nascent surface has an extremely high chemical activity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Chemical Activity of Nascent Surfaces for Tribochemical Reactions of Lubricant Components

Mori,

Nanao,

Takiwatari

2024

Langmuir

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Boundary lubrication characteristics are strongly dependent on tribochemical reactions at the contact interface. There are multiple factors that contribute to the activity of tribochemical reactions and the complexity of this phenomenon. Here, we focused on nascent surfaces created by friction and aimed to clarify their chemical properties. To achieve this, we first developed a method based on a mass spectrometer that can sensitively detect molecular adsorption and reactions on a nascent surface. We used various organic compounds as adsorbates and friction materials such as steel, aluminum, gold, and ceramics and examined adsorption of the organic compounds on the nascent surfaces. The adsorption properties of the additives differed between steel metal oxide and nascent steel surfaces. For example, polar organic phosphates, which are extreme-pressure additives, were more easily adsorbed on oxide surfaces, whereas nonpolar organic sulfur compounds were more easily adsorbed on nascent steel surfaces. Alcohols and ethers also adsorbed on nascent aluminum surfaces, whereas olefins and benzene did not. Nascent gold surfaces showed high catalytic activity. Saturated hydrocarbons and fluorinated compounds, which are chemically inert, were also adsorbed on nascent ceramic surfaces, showing high activity. Hydrocarbon oils decomposed through the influence of frictional heat on a nascent steel surface to generate hydrogen and methane. We applied reactive molecular dynamics to simulate the adsorption phenomenon on iron surfaces. As a result, the adsorption energy obtained by simulation and the experimentally determined adsorption activity correlated well. Thus, adsorption and reaction behaviors on nascent surfaces inferred by our method were theoretically supported. On the basis of the chemical properties of the nascent surfaces obtained here, it is possible to explain boundary lubrication phenomena.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Chemical Activity of Nascent Surfaces for Tribochemical Reactions of Lubricant Components

Mori,

Nanao,

Takiwatari

2024

Langmuir

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“…Changing the temperature from 27 • C to 85 • C enhances the decomposition process significantly, which can be seen from the pair distribution function intensity. The influence of temperature on adsorption and decomposition rate of the chemical species on the steel surface were also discussed previously [33].…”

Section: Discussionmentioning

confidence: 97%

Thermo-mechanical analysis of hydrogen permeation in lubricated rubbing contacts

Esfahani

Nogorani

Esfahani

2023

Tribology International

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“…It is noted that tribocatalysis lowers activation energy. 50,51 All of the factors mentioned above can accelerate mechanochemical reactions in a much faster rate than thermochemical ones. For this reason, tribological parameters seem not to be related to mechanochemical reactions except for a simple system mentioned in the section ‘Mechanolysis of hydrocarbon and desorption of hydrogen and ethylene – tribodegradation’ as an example.…”

Section: Discussionmentioning

confidence: 99%

Mechanochemistry as a key to understand the mechanisms of boundary lubrication, mechanolysis and gas evolution during friction

Hiratsuka

Kajdas

2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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Mechanical energy alters chemical reactions. Although the mechanisms of mechanochemical reactions are not understood well, they have been utilized for alloying, polishing, lubrication and so on. On the other hand, tribochemical reactions which involve the interactions between frictional materials and the environment accelerate the decomposition of solid and surrounding molecules. It results in the emission of small particles and gases, bringing problems to environment and health. Mechanochemical and tribochemical reactions are often studied in different fields and in different societies. Even if similar reactions from each field are named differently, the same physics and chemistry operate in both reactions. Therefore, this study aimed at better understanding of some tribochemical reactions from the mechanochemical point of view. The main mechanism is proposed to be the emission of electrons, which is enhanced by the energy input onto the surface and surrounding molecules due to the breakage of chemical bonds and chemisorption of environmental molecules.

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Tribochemical Reaction of Benzene on Nascent Steel Surface and Effect of Temperature

Cited by 5 publications

References 19 publications

Chemical Activity of Nascent Surfaces for Tribochemical Reactions of Lubricant Components

Chemical Activity of Nascent Surfaces for Tribochemical Reactions of Lubricant Components

Thermo-mechanical analysis of hydrogen permeation in lubricated rubbing contacts

Mechanochemistry as a key to understand the mechanisms of boundary lubrication, mechanolysis and gas evolution during friction

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