Dissertation/Thesis Abstract

The Electrorheological Effect of Polyhedral Silsesquioxane Cage Structures with Cyanopropyl Functional Groups
by Omambala, Joshua R., M.S., University of Louisiana at Lafayette, 2016, 101; 10248880
Abstract (Summary)

Previous research has shown that POSS particles in silicone oil show significant ER activity. It is shown for the first time the effect of the number of the same functional groups attached to POSS cage structures on the electrorheological activity of these structures. Two compounds of the Octahedral geometry (T8) of cyanopropyl POSS was used for this investigation. One of the compounds was purchased (monofunctionalized cyanopropyl POSS) and the other was synthesized (octafunctionalized cyanopropyl POSS). The hydrolysation method has been used in the synthesis, the yield of the synthesized octafunctionalized POSS compound calculated and the both micrometer sized compounds characterized. The effects of the functional group attached to the inorganic silicon-oxygen core structure of the POSS compounds on the rheological properties is demonstrated through steady flow and oscillatory tests. Particular attention is paid to how the number of the cyano functional groups affects the behavior of these suspensions of cyanopropyl POSS compounds in silicone oil under increasing electric field strength. The research also contributed answers to the effects of changing the concentration of the cyanopropyl POSS particles in the suspension. The flow curve was described by the Herschel-Bulkley model and the Yield stress values ascertained from the model. The dielectric characterization was also done to support the ER response results which showed that the octafunctionalized compound gave a better response. The differences of the electrorheological properties of these compounds has also been discussed with the tests.

Indexing (document details)
Advisor: McIntyre, Carl E.
Commitee: Chirdon, William M., Depan, Dilip, Gallo, August A.
School: University of Louisiana at Lafayette
Department: Chemical Engineering
School Location: United States -- Louisiana
Source: MAI 56/05M(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Engineering, Chemical engineering
Keywords: Electric field, Electrorheological fluid, Functional group, Large amplitude oscillatory shear, POSS particles, Synthesized particles
Publication Number: 10248880
ISBN: 9780355113297
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