Electrorheological Properties of Environmental Friendly Modified Cellulose
Considerable scientific and industrial interest is currently being focused on a class of materials known as electrorheological (ER) fluids, which display remarkable rheological behaviour, being able to convert rapidly and repeatedly from a liquid to solid when an electric field (E) is applied or removed. In this study, biodegredable cellulose (Cell) was modified and converted their carboxyl salts. Modified cellulose (Cell-Li) is characterised by (FT-IR), (SEM), (EDS) and (TGA). Suspensions of native and modified cellulose are prepared in corn oil. Rheological measurements were carried out via a rotational rheometer with a high voltage generator. These suspensions are determined; effects of electric field strength, shear rate, shear stress, temperature etc. onto ER activity. The results show not only that the ER properties are enhanced by increasing the particle concentration and electric field strength, but also the cellulose-based ER fluids exhibit viscoelastic behavior under an applied electric field due to the chain formation induced by electric polarization between particles.
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