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Papers by Hyoung Choi

Research paper thumbnail of Stimuli-responsive polyaniline coated silica microspheres and their electrorheology Stimuli-responsive polyaniline coated silica microspheres and their electrorheology

Silica/polyaniline (PANI) core–shell structured microspheres were synthesized by coating the surf... more Silica/polyaniline (PANI) core–shell structured microspheres were synthesized by coating the surface of silica micro-beads with PANI and applied as a candidate inorganic/polymer composite electrorheological (ER) material. The silica micro-beads were initially modified using N-[(3-trimethoxysilyl)-propyl] aniline to activate an aniline functional group on the silica surface for a better PANI coating. The morphology of the PANI coating on the silica surface was examined by scanning electron microscopy and the silica/PANI core–shell structure was confirmed by transmission electron microscopy. The chemical structure of the particles was confirmed by Fourier transform infrared spectroscopy. Rotational rheometry was performed to confirm the difference in the ER properties between pure silica and silica/PANI microsphere-based ER fluids when dispersed in silicone oil.

Research paper thumbnail of Polymer-Plastics Technology and Engineering Enhancement of Interlaminar Fracture Toughness of Carbon Fiber/Epoxy Composites Using Silk Fibroin Electrospun Nanofibres

In this paper, the effect of silk fibroin nanofibres (nSF) as a toughening agent of Carbon fiber/... more In this paper, the effect of silk fibroin nanofibres (nSF) as a toughening agent of Carbon
fiber/ fabric reinforced Epoxy Composites (CF/EP) is experimentally investigated. The
composites showed up to 30% improvement in Mode II fracture toughness the at 0.1
wt.% of nSF content. The scanning electron microscopy (SEM) observation revealed that
the fracture surface of nSF modified CF/EP appearance of the broken fiber and the
ductile–like matrix cracks showed a good adhesion between matrix resin and carbon
fibers which are reasons for enhance mode II interlaminar fracture toughness.
Downloaded by [Monash Unive

Research paper thumbnail of Stimuli-responsive polyaniline coated silica microspheres and their electrorheology Stimuli-responsive polyaniline coated silica microspheres and their electrorheology

Silica/polyaniline (PANI) core–shell structured microspheres were synthesized by coating the surf... more Silica/polyaniline (PANI) core–shell structured microspheres were synthesized by coating the surface of silica micro-beads with PANI and applied as a candidate inorganic/polymer composite electrorheological (ER) material. The silica micro-beads were initially modified using N-[(3-trimethoxysilyl)-propyl] aniline to activate an aniline functional group on the silica surface for a better PANI coating. The morphology of the PANI coating on the silica surface was examined by scanning electron microscopy and the silica/PANI core–shell structure was confirmed by transmission electron microscopy. The chemical structure of the particles was confirmed by Fourier transform infrared spectroscopy. Rotational rheometry was performed to confirm the difference in the ER properties between pure silica and silica/PANI microsphere-based ER fluids when dispersed in silicone oil.

Research paper thumbnail of Polymer-Plastics Technology and Engineering Enhancement of Interlaminar Fracture Toughness of Carbon Fiber/Epoxy Composites Using Silk Fibroin Electrospun Nanofibres

In this paper, the effect of silk fibroin nanofibres (nSF) as a toughening agent of Carbon fiber/... more In this paper, the effect of silk fibroin nanofibres (nSF) as a toughening agent of Carbon
fiber/ fabric reinforced Epoxy Composites (CF/EP) is experimentally investigated. The
composites showed up to 30% improvement in Mode II fracture toughness the at 0.1
wt.% of nSF content. The scanning electron microscopy (SEM) observation revealed that
the fracture surface of nSF modified CF/EP appearance of the broken fiber and the
ductile–like matrix cracks showed a good adhesion between matrix resin and carbon
fibers which are reasons for enhance mode II interlaminar fracture toughness.
Downloaded by [Monash Unive

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