Comment on “preparation and electrorheology of new mesoporous polypyrrole/MCM-41 suspensions”
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Electrorheological (ER) fluid, typically composed of polarizable particles and an insulating liquid, is a kind of smart materials which can be characterized by a reversible change from a liquid-like to a solid-like state without or with an electric field, [1, 2, 3, 4, 5, 6, 7, 8, 9] along with its magnetically analogous magnetorheological suspensions under an external magnetic field [10, 11, 12]. Rheological properties of this ER material such as shear stress and shear viscosity are also altered and tuned according to the electric field. Therefore, many investigators put a focus on this material and dedicate to their potential applications [13, 14].
Recently, Cheng et al.  reported a new type of anhydrous ER fluid prepared by dispersing nanocomposite particles (PPy/MCM-41) of conducting polypyrrole (PPy) confined in mesoporous silica (MCM-41) in silicone oil. This ER material was synthesized via a polymerization of pyrrole, which was introduced to the MCM-41 channels prior to the...
KeywordsShear Rate Flow Curve Electric Field Strength Bingham Fluid Applied Electric Field Strength
This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Korea.