Colloidal antiwear additives 1. Structural study of overbased calcium alkylbenzene sulfonate micelles

Mansot, Jean-Louis; Hallouis, M.; Martin, Jean‐Michel

doi:10.1016/0927-7757(93)80336-d

Cited by 51 publications

(36 citation statements)

References 8 publications

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“…The fine structures associated to C=C, C-C and C-H bondings in the initial compounds are not significantly detected in the EEL spectra of the films. These last ones are dominated by the well known fine structures associated to C=O and C-O [52,62]. These results demonstrate that hydrocarbon chains are no more significantly present in the films implying their quite total elimination during the friction process.…”

Section: Tribologic Properties Of the Two Types Of Colloidal Systemssupporting

confidence: 57%

Nanolubrication

Mansot¹,

Bercion²,

Romana³

et al. 2009

Braz. J. Phys.

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Lubrication strategies developed long time ago employed amphiphilic molecular lubricant additives to confer to lubricating oils or greases specific properties such as friction reduction, antiwear, anticorrosion. The understanding of their action and the development of various type of nanoparticles are at the origin of new lubrication strategies using composite or functionalized nanoparticles in dispersion in lubricating oils or greases to confer to the lubricants the needed functions. The present work is concerned with the presentation of these new approaches. Some examples will be developed to show the main aspects of the mechanisms of action of these new nano-additives.

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Section: Tribologic Properties Of the Two Types Of Colloidal Systemssupporting

confidence: 57%

Nanolubrication

Mansot¹,

Bercion²,

Romana³

et al. 2009

Braz. J. Phys.

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“…Most, though not all of the low boundary friction of detergents C and D was maintained even during prolonged rubbing in base oil, as illustrated for detergent C in Fig. 11, implying that the sulphonate is irreversibly bound to the calcite, as previously suggested by Mansot et al [32].…”

Section: Discussionmentioning

confidence: 58%

Film Forming and Friction Properties of Overbased Calcium Sulphonate Detergents

Topolovec-Miklozic

Forbus²,

Spikes

2007

Tribol Lett

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The film-forming and friction properties of overbased calcium sulphonate (OBCaSu) detergents in rolling-sliding, thin film, lubricated contact have been investigated. All of the commercial detergents studied form thick, solid-like, calcium carbonate films on the rubbed surfaces, of thickness 100-150 nm. The films have a padlike structure, interspersed by deep valleys in which practically no film is present. These films have the effect of increasing friction in intermediate speed conditions, an effect which is believed to occur because the pad structure of the film inhibits fluid entrainment and thus postpones the formation of an EHD film to higher entrainment speeds. Large differences were noted between the boundary friction coefficients of the various detergents tested. Two of them gave very low boundary friction coefficients, in the range 0.06-0.08, while the other two gave considerably higher friction. These differences are believed to originate from differences in the structures of the alkyl chains in the sulphonate detergent molecules. The films formed by OBCaSu detergents can be removed very effectively by treatment with EDTA solution and this shows that the films are effective in preventing wear.

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“…This may indicate a reduction in order. [2,16] Among the crystalline phases, the edge position shifts to higher energies from calcite (DE 0 = 0 eV) via monohydrocalcite (DE 0 = 0.2 eV) to aragonite (DE 0 = 1.5 eV), which reflects the change in the coordination numbers in these different samples: six, eight, and nine oxygen atoms in the first coordination shell, respectively. A similar trend was observed by Powers et al [17] in E 0 shifts of Ca salts having different coordination numbers and bond distances.…”

Section: Resultsmentioning

confidence: 99%