Influence of substrate and shear on adsorption at solid / liquid interfaces: Towards stability prediction in lubricants.
The combination of neutron reflectometry with rheology is relatively new, but is extremely important to understand fundamental processes of lubrication where adsorption from solution to a solid interface and the nature of the adsorbed layer will dictate the properties of the lubricant. Here we which to exploit this setup to study the adsorption of a model polymer addtive (polybutadiene) as a function of shear rate, bulk composition and temperature. We have deliberately chosen an extremely simple system in order to focus on the effect of substrate on NR. This will provide important insights into the nature of deposition of actives in lubricants and provide unprecedented detail on the relationship between polymer dynamics, phase behaviour and adsorption. We have calculated the reflectivity for the adsorption of a polymer layer of order of the polymers dimensions and shown that this technique is sufficiently sensitive, when using a deuterated squalane model oil, to characterise the quantity and nature of the adsorbate. Ultimately we propose to implement models based on these studies to provide robust tools for predicting failure mechanisms in structured products such as lubricants.
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Richard L Thompson; Stephen C Boothroyd; CABRAL Joao T.; GUTFREUND Philipp; HART James and MCLEISH Tom C B. (2019). Influence of substrate and shear on adsorption at solid / liquid interfaces: Towards stability prediction in lubricants.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1874
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