Gyeonggi do, North Korea
Gyeonggi do, North Korea

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Kang T.J.,Hyosung R and D Business Labs. | Hong K.H.,Hyosung R and D Business Labs. | Ahn B.W.,Hyosung R and D Business Labs. | Kim H.Y.,Seoul National University
Fibers and Polymers | Year: 2011

Carbon nanotube (CNT)/magnetite (Fe 3O 4) nanocomposites were successfully fabricated by nanocoating. When the CNT/Fe 3O 4 nanocomposites were added to a carbonyl (CI) based magnetorheological fluid (MRF), the magnetic rheological properties of the MRF were enhanced. Such enhancement in magnetic rheological properties of the CI-CNT/Fe 3O 4 MRF is considered to be attributable to both the superparamagnetic property of the magnetic layer covering the CNT surface and the high length to diameter ratio of the CNT/Fe 3O 4 nanocomposite. Impact properties for CI-CNT/Fe 3O 4 MRF treated Kevlar fabrics were also tested, and improved impact properties were observed with external magnetic fields compared to CI-MRF treated Kevlar fabrics. © 2011 The Korean Fiber Society and Springer Netherlands.

Shin K.,Hanyang University | Lee S.,Hanyang University | Kim J-J.,Hyosung R and D Business Labs | Suh K.-D.,Hanyang University
Macromolecular Rapid Communications | Year: 2010

In this study, uniform dumbbell-shaped non-spherical particles are produced by seeded polymerization, and the electro-rheological (ER) properties are compared to those of spherical-shaped particles after surface coating with functionalized multiwall carbon nanotubes (f-MWCNTs). The non-spherical particles formed linear chains under an applied electric field. The yield stress of the non-spherical particles is five-times as high as that of the spherical particles. The enhanced ER properties of the dumbbell-shaped non-spherical particles are attributed to the discrete dipole moments, which are found to depend on the morphology. Non-spherical particles have been synthesized and the electrorheology properties investigated as a result the particle morphology. Compared with the ER properties of spherical particles, the yield stress of the non-spherical particle was five times as high because of the discrete dipole moment attributable to the non-spherical morphology. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Shin K.,Hanyang University | Kim J.-J.,Hyosung R and D Business Labs. | Suh K.-D.,Hanyang University
Journal of Colloid and Interface Science | Year: 2010

Monodisperse " monolithic-structured" organic-inorganic composite microspheres were produced by a seeded sol-gel process method. A large number of nano-silica particles were generated and dispersed in the inner domains of the obtained microspheres. Seed particles were prepared by dispersion co-polymerization of styrene and (trimethoxysilyl)propyl 2-methylprop-2-enoate (TMSPM). The seed particles were swollen with an emulsified tetraethoxysilane (TEOS) in 0.25. wt.% sodium dodecylsulfate (SDS) aqueous solutions. Then the sol-gel reaction was conducted with ammonium hydroxide after completion of the swelling process. In contrast to conventional methods, the sol-gel reaction occurred in the inner space of the prepared template particles and monolithic-structured nano-silica and polystyrene organic-inorganic composite microspheres were obtained. The synthetic procedure for composite particles was studied by utilizing transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and thermo-gravimetric analysis (TGA). © 2010 Elsevier Inc.

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