Aggregation kinetics of colloidal suspensions of engine soots. Influence of polymeric lubricant additives

Simulation of Particle Adsorption onto a Polymer-Coated Surface Using the Dissipative Particle Dynamics Method

“…hundred nanometers for a large agglomerated particle (1). Polymer length can range from around 25 nm up to 1000 nm and so a wide range of relative polymer lengths is possible.…”

“…Measures taken to meet regulations to control exhaust emissions, such as exhaust gas recirculation (EGR), while successfully reducing emissions of NO x , have unfortunately led to more soot entering the lubricating oil. Agglomeration of the soot in the lubricating oil adversely affects the viscosity of the oil and so dispersants have to be added to the oil in an attempt to control this (1). This is the system that these simulations are intended to ultimately model, although a more generic problem will be studied initially.…”

“…An important advance was made to the model in 1995 when the fluctuationdissipation theorem of Español and Warren (4) was formulated. DPD has been applied to a number of applications, including the study of polymer solutions (5-7), binary fluid systems (8,9), and the rheological properties of dense colloidal 1 To whom correspondence should be addressed. E-mail: J.Gibson@liv.ac.uk.…”

Micellization and Adsorption to Carbon Black of Polyisobutylene‐Based Ionic Liquids

“…Studies utilizing ILs and asphaltenes, which are lower molecular weight PAHs similar in structure to that of carbon black, have also identified the profound importance of the structure of the cationic moiety. Like asphaltenes, carbon black is marked by a high degree of aromaticity, high polarity, and exhibits a strong tendency to form aggregates through π–π interactions . Although importance of low charge density of the cation is recognized, there has been a shift in attributing the cation, rather than the anion, as being the predominant factor for binding of the headgroup of amphiphiles to aromatics and PAH's .…”

Influence of Metallic Ions on the Aggregation of Soft Colloidal Polysaccharides

“…The subject of aggregation has received considerable attention [8][9][10][11][12][13][14][15][16] to get a fundamental and quantitative understanding of its mechanism. The existence of two limiting and universal aggregation modes has so been established and recognized by several experimental [17][18][19][20][21][22][23][24][25][26] and theoretical [27][28][29][30][31][32][33][34] studies: the diffusion-limited aggregation (DLA) [35][36][37] and the reaction-limited aggregation (RLA) [38][39][40]. The difference between them is how the particles stack together.…”