Orientational ordering in 2,6-lutidine near quartz surfaces modified by carbon

Levchenko, V.A.; Popovskii, A. Yu.

doi:10.1016/s0167-7322(99)00179-8

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…The following parameters are normally used to prepare oriented linear-chain carbon [12] a deposition rate of 1 nm/min; an ion current density of the beam irradiating the growing film of 1 mA/cm 2 ; and a residual gas pressure of P = 10 −7…”

Section: Methodsmentioning

confidence: 99%

“…These coatings have а strong influence on the structural ordering of а boundary layer and facilitate formation of highly oriented layers of molecules in these layers. Such coatings-orientants can create planar (parallel), homeotropic (normal) and inclined orientation [10] [11] [12] of molecules in а boundary layer in respect to friction surface. According to Levchenko et al [7] [8] [9] [10], the coatings with homeotropically orienting structure have stronger effect on the orientation ordering in boundary layers as compared to others.…”

Section: Introductionmentioning

confidence: 99%

“…The value of this ordering parameter usually varies from 0.1 to 0.6 [6]. The maximum ordering is provided by mono-crystalline carbon [12].…”

Section: Introductionmentioning

confidence: 99%

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To the New Concept of Green Tribology

Levchenko¹,

Buyanovskii²,

Matveenko³

2017

MSCE

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The aim of the present work is to confirm the fundamental possibility of creating new generation of the nanostructured composite coatings-orientants are studied under conditions of boundary lubrication in inactive oil, as green tribology aspect and to experimentally prove the efficacy of the nanostructured composite coatings-orientants for engineering applications. Tribological properties of nanostructured composite coatings-orientants are studied under conditions of boundary lubrication in inactive oil, as green tribology aspect. The friction tests were carried out by using two test configurations: "ball-ondisc" and "ring-to-ring". As lubricants some model and commercial oils were used. It is found that the friction coefficient and its temperature dependence differ significantly for nanostructured composite coatings under study. The obtained results were attributed to different orientating effect of these coatings on structural ordering in boundary layers, which structure is considered as a mesophase of liquid crystals. The findings suggest that the nanostructured composite coatings-orientants with orientating effect on boundary layers are advantageous for improving antifriction characteristics and for governing processes of boundary lubrication. The nanostructured composite coatingsorientants can improve lubricating properties of oils (with and without additives) and may be advantageous for engineering practice as they improve antifriction characteristics of rubbing pairs and allow controlling the processes of boundary lubrication. Thus, received nanostructured composite coatingsorientants can be today the best materials of green tribology in engineering.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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To the New Concept of Green Tribology

Levchenko¹,

Buyanovskii²,

Matveenko³

2017

MSCE

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“…In studies [6,7] it was found that the boundary layers have increased viscosity. However, these works were devoted to the study of the properties of aromatic liquids, the use of which in ship power plants is limited.…”

Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

Analysis of mechanical energy losses in marine diesels

Sagin

Madey

Stoliaryk

2021

TAPR

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The object of research is marine diesel engine oils, which provide lubrication, cooling and separation of friction surfaces. The subject of the research is the process of ensuring minimum mechanical losses in marine diesel engines. A problematic point in ensuring the lubrication of the cylinder-piston group and motion bearings is the lack of analytical and experimental studies that establish the relationship between the structural characteristics of engine oils and mechanical losses arising in marine internal combustion engines. The degree of orientational ordering of molecules and the thickness of the boundary lubricating layer are considered as the structural characteristics of engine oils. The determination of these values was carried out using the optical method based on the anisotropy of the light absorption coefficient by the boundary lubricant layer and the isotropic volume of the liquid (engine oil). The assessment of the level of mechanical losses arising in marine diesel engines was carried out according to an indirect indicator – the overshoot of the rotational speed and the time to reach the steady state of operation in the event of a change in load. It has been experimentally established that for engine oils used in marine internal combustion engines, the thickness of the boundary layer can be 15–17.5 µm. Motor oils, which are characterized by a higher ordering of molecules and a thickness of the boundary lubricant layer, ensure the flow of transient dynamic processes with less overshoot and a shorter transient time. This ensures the level of minimal mechanical losses occurring in marine diesel engines. The technology for determining the structural characteristics of engine oils can be used for any type and grade of oil (mineral or synthetic; high or low viscosity; used in both circulating and cylinder lubrication systems). The method of indirect assessment of mechanical losses of marine diesel engines can be used for any types of internal combustion engines of ships of sea and river transport (low-, medium- and high-speed; as well as performing the functions of both main and auxiliary engines).

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“…Конструкційні та технологічні заходи, що забезпечують зниження механічних втрат енергії під час експлуатації суднових ДВЗ, розглядалися в різних роботах. При цьому увага приділялася модифікації поверхонь циліндро-поршневої групи [3], забезпеченню мінімальної витрати палива [4], загальній методології оцінки енергетичних витрат [5], регенерації властивостей робочих поверхонь основних елементів дизеля [6]. Постановка завдання.…”

Section: Abstract It Is Pointed Out That the Energy Complexes Of Rivunclassified

Зниження Механічних Втрат У Суднових Середньообертових Дизелях За Рахунок Оптимізації Роботи Циркуляційних Систем Мащення

Sagin¹

2020

Вісник ОНМУ

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Розглянути питання забезпечення мінімального рівня механічних втрат у суднових середньообертових дизелях. Наведені результати визначення механічного коефіцієнту корисної дії дизеля 6EY22AW фірми Yanmar у діапазоні його навантаження 35-80 % та різних умовах експлуатації його системи циркуляційного мащення. Експериментально доведено, що при оптимальному поповненні циркуляційної системи та додавання в обсяг циркуляційної системи мащення поверхнево-активної присадки з оптимальною концентрацією забезпечується 5,8-11,1 %-е зниження механічних втрат, що відображається в пропорційному збільшенні механічного коефіцієнта корисної дії дизеля.

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Orientational ordering in 2,6-lutidine near quartz surfaces modified by carbon

Cited by 5 publications

References 2 publications

To the New Concept of Green Tribology

To the New Concept of Green Tribology

Analysis of mechanical energy losses in marine diesels

Зниження Механічних Втрат У Суднових Середньообертових Дизелях За Рахунок Оптимізації Роботи Циркуляційних Систем Мащення

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