Effect of water on overbased sulfonate engine oil additives

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

doi:10.1021/la703680e

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 journal › Journal article › Research › peer-review

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.

Original language	English
Journal	Langmuir
Volume	24
Issue number	8
Pages (from-to)	3807-3813
Number of pages	7
ISSN	0743-7463
DOIs	https://doi.org/10.1021/la703680e
Publication status	Published - 2008
Externally published	Yes

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title = "Effect of water on overbased sulfonate engine oil additives",

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.",

author = "Joe Tavacoli and Dowding, {P. J.} and Steyder, {D. C.} and Barnes, {D. J.} and Routh, {A. F.}",

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AU - Tavacoli, Joe

AU - Dowding, P. J.

AU - Steyder, D. C.

AU - Barnes, D. J.

AU - Routh, A. F.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

U2 - 10.1021/la703680e

DO - 10.1021/la703680e

M3 - Journal article

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SP - 3807

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JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 8

ER -

Effect of water on overbased sulfonate engine oil additives

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