SANS study of the reformation of an engine oil gel after shear
We would like to observe the change in neutron scattering observed after applying shear stress to gel samples. Complete gelation of samples of dodecane containing an engine oil additive on the addition of water and acetic acid has been observed. After shear the recovery of structure in the gel has been measured using a rheometer; initially there is a period of rapid recovery of mechanical strength (indicated by increasing values of the elastic modulus, G'), which decays to a gradual recovery over time. This recovery is dependent on temperature. The additive is an overbased detergent: colloidal magnesium carbonate particles stabilised by a sheath of magnesium alkyl salicylate surfactant molecules. Using SANS we would like to further our understanding of the gel reformation, using isotopic contrast variation, comparing the scattering data with rheological data.
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ROUTH Alexander; BARTHOLOMEW Felicity; DOWDING Peter; GRILLO Isabelle and WILLIS Colin. (2014). SANS study of the reformation of an engine oil gel after shear. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1392
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