Journal article
Effect of water on overbased sulfonate engine oil additives
Department of Chemical and Process Engineering, University of Sheffield, Mappin Street, Sheffield, United Kingdom.1
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.
Language: | English |
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Year: | 2008 |
Pages: | 3807-13 |
ISSN: | 15205827 and 07437463 |
Types: | Journal article |
DOI: | 10.1021/la703680e |