Magnetic resonance studies of electro-rheological fluids

Bailey, Phillip

(1989)

Bailey, Phillip (1989) Magnetic resonance studies of electro-rheological fluids.

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Abstract

Electro-rheological (ER) fluids, which are dispersions of solid particles in a non-conducting oil, have been studied for the first time at a molecular level using magnetic resonance spectroscopic techniques..The group of fluids on which measurements were first made was the already widely used lithium polymethacrylate dispersed in 20 cs silicone oil. The problems associated with this fluid such as high conductivity, relatively low viscosity changes, and settling out of the solid particles, led to fluids containing zeolites also to be investigated.Mechanical tests were performed on all these fluidsincluding static yield stresses measured at zero shear rate,and then a new electroviscometer was designed and built totest fluid performances in the shear rate range from 1.5 to 43.8 s and temperatures from +5 to +60 C.NMR relaxation measurements were used to study themobilities of the water and the ions in all these solids toinvestigate the relationship between these properties, and the performance of a solid as a constituent in an ER fluid. This is the first time that many of these systems have been studied in this way.ESR was used to study the motion of spin probe radicals in partially hydrated zeolites for the first time. The effect of an electric field on the motion of the spin probe inside a zeolite particle was measured and decreased motion was observed as the strength of the electric field wasincreased in those zeolites which showed a significant EReffect, while no effect on the probe motion was seen for those zeolites which constituted a weak ER fluid. The first saturation transfer ESR experiments have been performed on spin probes inside partially hydrated zeolites that previously had been out of the motional range of conventional CWESR, and the anisotropy of the probe motion has been highlighted.

Information about this Version

This is a Accepted version
This version's date is: 1989
This item is not peer reviewed

Link to this Version

https://repository.royalholloway.ac.uk/items/8a94b0c6-b9ba-45c5-a207-98d8a7552bee/1/

Item TypeThesis (Doctoral)
TitleMagnetic resonance studies of electro-rheological fluids
AuthorsBailey, Phillip
Uncontrolled KeywordsMolecular Physics; Pure Sciences; Electro; Electro-Rheological Fluids; Electro-Rheological Fluids; Fluids; Magnetic; Resonance; Rheological; Studies
Departments

Identifiers

ISBN978-1-339-60371-1

Deposited by () on 31-Jan-2017 in Royal Holloway Research Online.Last modified on 31-Jan-2017

Notes

Digitised in partnership with ProQuest, 2015-2016. Institution: University of London, Royal Holloway and Bedford New College (United Kingdom).


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