Electrorheology of a mesoporous silica having conducting polypyrrole inside expanded pores

Autor:	Wha-Seung Ahn, Hyoung Jin Choi, Fei Fei Fang
Rok vydání:	2010
Předmět:	Nanocomposite Materials science Constitutive equation General Chemistry Mesoporous silica Condensed Matter Physics Polypyrrole Electrorheological fluid chemistry.chemical_compound chemistry Rheology Mechanics of Materials Shear stress General Materials Science Composite material Bingham plastic
Zdroj:	Microporous and Mesoporous Materials. 130:338-343
ISSN:	1387-1811
DOI:	10.1016/j.micromeso.2009.11.032
Popis:	A pore-expanded mesoporous silica (MCM-41-E) having particles of conducting polypyrrole (PPY) included inside its uniformly aligned one-dimensional channels was prepared, and their electrorheological (ER) characteristics when dispersed in a silicone oil were investigated. Both N2-adsorption isotherm and SEM images were employed to confirm the successful formation of PPY/MCM-41-E nanocomposite. The XRD also provided an additional information on the properties of the synthesized nanocomposite material. The nanocomposite showed typical ER characteristics. Shear stress curve was more accurately described by using the rheological constitutive equation (CCJ model) we proposed compared with the Bingham fluid model. Yield stress which increases with applied electric field strength was analyzed based on the universal yield stress equation we suggest as a function of applied electric field strength. It was found that the universal yield stress equation collapses these data onto a single curve well in the case of PPY/MCM-41-E nanocomposite based ER fluid.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2e1e856f83d11f6a26932600d6f376c3 https://doi.org/10.1016/j.micromeso.2009.11.032 Zobrazit plný text záznamu Full Text from ScienceDirect