Effect of water on overbased sulfonate engine oil additives

Joe Tavacoli, P. J. Dowding, D. C. Steyder, D. J. Barnes, A. F. Routh

Research output: Contribution to journalJournal articleResearchpeer-review


The presence and effect of water on calcium carbonate nanoparticles used in engine additives, stabilized with a sulfonate surfactant, is investigated using small-angle neutron scattering, dynamic light scattering, Fourier transform infrared spectroscopy, and rheometry. These techniques provide complementary data that suggests the formation of a layer of water around the core of the particles ensuring continued colloidal stability yet increasing the dispersion viscosity. Through the use of small-angle neutron scattering, the dimensions of this layer have been quantified to effectively one or two water molecules in thickness. The lack of a significant electrostatic repulsion is evidence that the water layer is insufficient to cause major dissociation of surface ions.
Original languageEnglish
Issue number8
Pages (from-to)3807-3813
Number of pages7
Publication statusPublished - 2008
Externally publishedYes


Dive into the research topics of 'Effect of water on overbased sulfonate engine oil additives'. Together they form a unique fingerprint.

Cite this