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- W2550871533 abstract "Monodisperse anisotropic particles have tremendous potentials in materials science and engineering (Hosein et al., 2010). As one of this kind of materials, snowman-like particles have drawn a special attention in the aspects of both their synthesis mechanism and applications. In this study, we synthesized micron-sized snowman-like poly(methyl methacrylate) (PMMA) particles via a seed emulsion polymerization method, in which the cross-linked PMMA seed was swollen by methyl methacrylate monomer solutions and then polymerized. To induce semiconducting properties to the particles, they were coated with polyaniline (PANI) similar to core/shell structured PANI/PMMA microbead (Cho et al., 2003). The morphologies of the PMMA seeds, snowman like particles with and without coating are shown in Fig. 1. When the semiconducting anisotropic particles are dispersed in silicone oil, they exhibit electrorheological (ER) properties of yield stress and dramatically increased shear viscosity under an electric field (Choi and Jhon, 2009, Zhao and Yin, 2002). This ER behaviour is said to stem from the polarization of the particles, resulting in the structural change (Zhang et al, 2010). We analyzed these anisotropic particle based ER fluid using a rheometer. A flow curve of shear stress vs. shear rate was fitted using a rheological equation of state as shown in Fig. 2. The dielectric spectra, as supporting data for the ER effect, were also measured using a LCR meter. It was further found that the relaxation time of this ER fluid was relatively shorter than typical ER fluid, explaining their relation to the ER characteristics (Liu et al., 2010, Liu et al., 2011)." @default.
- W2550871533 created "2016-11-30" @default.
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- W2550871533 date "2011-01-01" @default.
- W2550871533 modified "2023-09-26" @default.
- W2550871533 title "Fabrication of polyanilinecoated snowman-like pmma microparticle and its electrorheology" @default.
- W2550871533 hasPublicationYear "2011" @default.
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