Investigation of Headgroup Chemistry-Induced Changes on the Structural Evolution of Organic Friction Modifier Self-Assembled Structures

The precise mechanism by which organic friction modifiers adsorb to a metal surface and reduce friction and wear remains unclear. Conflicting results exist between the currently accepted theory for lubrication and molecular dynamics simulations. In order to utilise these compounds optimally, this mechanism must be precisely understood, informing the next generation of friction modifiers that drastically improve the lifetimes of engines and significantly reduce fuel emissions. In this experiment, the structure of a range of OFM candidates will be investigated in bulk dodecane by neutron scattering. The compounds we will study are related to Ethomeen 18/12 (E1812), a successful OFM candidate that we have characterised in our previous experiments. We will investigate how changes in headgroup nature affect the self-assembly patterns of OFMs as a function of chemistry type, as well as qualify and quantify the effect of water and acetic acid doping on these aggregates. This work will exploit the use of SANS and deuteration to understand and characterise larger-scale structural evolution, to be compared to that of E1812.