Synthesis and electrorheological characteristics of sea urchin-like TiO2 hollow spheres

Cheng, Qilin; Pavlı́nek, Vladimı́r; He, Ying; Yan, Yanfang; Li, Chunzhong; Sáha, Petr

doi:10.1007/s00396-011-2398-8

Cited by 73 publications

(41 citation statements)

References 29 publications

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“…A delay time in shear stress was clearly observed following the electric field removed from the ER fluid, which is related to the magnitude of the relevant electric field. The response of the shear stress to the electric field in the field on and off process is considered to be the charging and discharging processes corresponding to polarization and de-polarization of the suspended particles, respectively [38,39].…”

Section: Resultsmentioning

confidence: 99%

Facile fabrication of self-assembled PMMA/graphene oxide composite particles and their electroresponsive properties

Zhang

Choi

2012

Colloid Polym Sci

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Core-shell-structured poly(methyl methacrylate) (PMMA)/graphene oxide (GO) composite particles were prepared using a facile process, in which GO was adsorbed spontaneously onto a microspherical PMMA surface when hydrophobic microspheres were dispersed in deionized (DI) water stabilized by amphiphilic GO under ultrasonication. The fabricated composite was characterized by SEM, TEM, FT-IR, and thermogravimetric analysis. Results showed that the particle surface could be wrapped with GO without the need for surfactants. In addition, electrorheological behavior of the chain-forming process of the PMMA/GO composite particles was observed by optical microscopy under an applied electric field. Both shear stress and shear viscosity related to the strength of the applied electric field were measured using a rotational rheometer. The proposed Cho-Choi-Jhon model was used to describe their ER performances for the entire shear rate region. Moreover, the response of the shear stress to an imposed square voltage at a fixed shear rate was also examined.

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Section: Resultsmentioning

confidence: 99%

Facile fabrication of self-assembled PMMA/graphene oxide composite particles and their electroresponsive properties

Zhang

Choi

2012

Colloid Polym Sci

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“…6b). This phenomenon of ER fluids forming fibril chains under an external applied electric field normally occurs, and the structure remains as long as the field is applied [5]. Figure 7 shows the rheological characteristics of the flow curve of the shear stress and the shear viscosity of the PPy/HNT composite-based ER fluid.…”

Section: Resultsmentioning

confidence: 97%

“…These polarized particles behave as electric dipoles that link with each other to form chains exhibiting a reversible transition from a fluid-like to a solid-like state in the direction of the applied electric field in the order of milliseconds [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole-wrapped halloysite nanocomposite and its rheological response under electric fields

2014

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Conducting polypyrrole (PPy)-wrapped halloysite nanotube (HNT) nanocomposites (PPy/HNT) were prepared using an in situ polymerization process of pyrrole monomer in the presence of a HNT dispersion, and its electrorheological (ER) properties were investigated under applied electric fields. The morphology of both HNT and PPy/HNT nanocomposite was examined by scanning electron microscopy and transmission electron microscopy. The synthesized PPy/HNT nanocomposites were also analyzed using a physisorption analyzer, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The ER properties of the PPy/HNT nanocomposite dispersed in silicone oil measured using a rotational rheometer under different electric field strengths exhibited ER behaviors of shear stress, dynamic moduli, and relaxation modulus with a change in slope from 1.5 to 1.0.

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“…The ER behavior performed by ER fluid [16,17], which is a typical kind of suspension of semiconducting or polarizable particles in insulating liquids such as silicone oils, is a magical rheological transformation from a liquid-like to a solid-like state after the application of an electric field. Note that as a homogeneous ER fluid, immiscible polymer blends have been also introduced [18].…”

Section: Introductionmentioning

confidence: 99%

Pickering emulsion polymerization of core–shell-structured polyaniline@SiO2 nanoparticles and their electrorheological response

2012

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We synthesized semiconducting polyaniline (PANI) nanoparticles through a solid-stabilized Pickering emulsion route using silica nanoparticles. Specific morphologies of the silica nanoparticle wrapped PANI particles were observed using both scanning electron microscope and transmission electron microscope, which showed the emulsifiability of silica nanoparticles in the emulsion system. Electrorheological (ER) behavior of this novel particlebased ER fluid dispersed in silicone oil was measured by a controlled shear stress rheometer and analyzed with a flow curve equation of Cho-Choi-Jhon model, which fitted well the flow curves measured in the exposed electric field.

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Synthesis and electrorheological characteristics of sea urchin-like TiO2 hollow spheres

Cited by 73 publications

References 29 publications

Facile fabrication of self-assembled PMMA/graphene oxide composite particles and their electroresponsive properties

Facile fabrication of self-assembled PMMA/graphene oxide composite particles and their electroresponsive properties

Polypyrrole-wrapped halloysite nanocomposite and its rheological response under electric fields

Pickering emulsion polymerization of core–shell-structured polyaniline@SiO2 nanoparticles and their electrorheological response

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