Adsorption properties of succinimide dispersants on carbonaceous substrates

Tomlinson, A. A. G.; Scherer, Bernd; Karakosta, Eleni; Oakey, M.; Danks, Timothy N.; Heyes, D. M.; Taylor, Spencer E.

doi:10.1016/s0008-6223(99)00087-1

Cited by 25 publications

(22 citation statements)

References 14 publications

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“…The function of many lubricant additives depends on chemical reactions, which are generally not considered in classical MD simulations. Despite this, classical MD simulations have given unique insights into the behaviour of a range of lubricant additives including detergents [207,208], dispersants [209,210], viscosity modifiers [91,92,211], anti-wear additives [212][213][214][215], and corrosion inhibitors [216][217][218]. The most widely studied class of lubricant additives with MD are friction modifiers [219], which are a wellsuited application of confined NEMD simulations.…”

Section: Nemd Simulations Of Lubricant Additivesmentioning

confidence: 99%

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

2018

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Nonequilibrium molecular dynamics (NEMD) simulations have provided unique insights into the nanoscale behaviour of lubricants under shear. This review discusses the early history of NEMD and its progression from a tool to corroborate theories of the liquid state, to an instrument that can directly evaluate important fluid properties, towards a potential design tool in tribology. The key methodological advances which have allowed this evolution are also highlighted. This is followed by a summary of bulk and confined NEMD simulations of liquid lubricants and lubricant additives, as they have progressed from simple atomic fluids to ever more complex, realistic molecules. The future outlook of NEMD in tribology, including the inclusion of chemical reactivity for additives, and coupling to continuum methods for large systems, is also briefly discussed.

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Section: Nemd Simulations Of Lubricant Additivesmentioning

confidence: 99%

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

2018

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“…Some of them even help to "clean-up" coked nozzles to improve the performance [4, 6, 7, 9, 11, 31 -35]. Further insight into the structureactivity relationship of diesel fuel detergency additives can be found in paper by Tomlinson et al [36] while the impact of two common detergent chemistries (polyether amine and polybutene amine) on the structure of carbonaceous deposits has been investigated by Zerda and co-workers [37]. Other diesel fuel additives that have received considerable attention over the past ten years are cold flow improvers and lubricity additives [38,39].…”

Section: Additive Treatmentmentioning

confidence: 99%

Deposit Formation in the Holes of Diesel Injector Nozzles: A Critical Review

Birgel¹,

Ladommatos²,

Aleiferis³

et al. 2008

SAE Technical Paper Series

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Current developments in fuels and emissions regulations are resulting in increasingly severe operating environment for the injection system. Formation of deposits within the holes of the injector nozzle or on the outside of the injector tip may have an adverse effect on overall system performance. This paper provides a critical review of the current understanding of the main factors affecting deposit formation.Two main types of engine test cycles, which attempt to simulate field conditions, are described in the literature. The first type involves cycling between high and low load. The second involves steady state operation at constant speed either at medium or high load.

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“…Rheological measurements have commonly been used to assess the efficacy of dispersants in reducing colloidal aggregation. , The effect of the dispersant chemical structure as captured by molecular architecture, , the number of secondary amine groups in the polyamine core of PIBSI, or the length and backbone structure of the hydrophobic tail has been considered, along with the dispersant molecular weight , and suspension temperature. , The common practice is to consider the properties of the suspension at identical overall concentrations of the added dispersant. However, different dispersants will in general present different surface coverage values at the same overall concentration, reflecting differences in the adsorption–desorption equilibrium due to differences in molecular structure.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Dispersant Stabilization of Colloidal Suspensions from the Scaling Behavior of Gel Rheology and Adsorption Measurements

et al. 2017

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Maintaining suspension stability by effective particle dispersion in systems with attractive interactions can be accomplished by the addition of dispersants that modify the interparticle potential to provide steric or electrostatic barriers against aggregation. The efficacy of such dispersants is typically considered simply by the modification of suspension rheological properties as a function of the overall added dispersant concentration. However, such considerations do little to reveal the molecular origin of differences in dispersant efficacy because they do not consider differences in surface activity. We combine measured adsorption isotherms with the rheological characterization of the elasticity of colloidal gels formed by particle aggregation to provide a more meaningful assessment of dispersant efficacy. The rheological data show that the dispersants are effective at reducing particle aggregation, whereas, from the adsorption isotherms, they differ considerably in their surface coverage at constant overall concentration. When compared at constant dispersant particle surface coverage, the gel rheology shows marked differences across the different dispersants, as opposed to comparisons at constant overall dispersant concentration in the suspensions. In particular, the power-law volume fraction scaling of gel elasticity at constant coverage reveals clear differences in the critical volume fraction for gel formation for the different dispersants. The most efficacious dispersant is that associated with the largest critical volume fraction for gel formation at a given surface coverage. This work demonstrates the utility of rheological investigations coupled with accurate determinations of surface coverage to better differentiate dispersant performance, which may improve efforts to engineer new dispersant molecules.

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Adsorption properties of succinimide dispersants on carbonaceous substrates

Cited by 25 publications

References 14 publications

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

Deposit Formation in the Holes of Diesel Injector Nozzles: A Critical Review

Evaluating the Dispersant Stabilization of Colloidal Suspensions from the Scaling Behavior of Gel Rheology and Adsorption Measurements

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