Effect of Water on Overbased Sulfonate Engine Oil Additives

Tavacoli, J. W. and Dowding, P. J. and Steytler, D. C. and Barnes, D. J. and Routh, A. F. (2008) Effect of Water on Overbased Sulfonate Engine Oil Additives. Langmuir, 24 (8). pp. 3807-3813. DOI 10.1021/la703680e

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Official URL: http://dx.doi.org/10.1021/la703680e

Abstract

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.

Item Type: Article
Uncontrolled Keywords: BPI
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Langmuir
Volume: 24
Page Range: pp. 3807-3813
Identification Number: 10.1021/la703680e
Depositing User: Sarah Humbert
Date Deposited: 08 Jul 2010 08:58
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1428

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