Dep. Mat. Sci., Seoul National University - Kwanakro 1,Kwanakku, Seoul, Korea

Title: Static Yield Stress of a Magnetorheological Fluid COntaining Pickering Emulsion Polymerized Fe203/Polystyrene Composite Particles

Symposium: Rheology & Advanced Characterization

Professor Yongsok Seo

School of Materials Science and Engineering
College of Engineering, Seoul National University
Kwanakro-1, Kwanakku, Seoul , Korea 151-744
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tel: 82-2-880-9085, Fax: 82-2-885-9671


1987 Ph.D. University of Texas at Austin (Chemical Engineering)
1984 M.S. University of Texas at Austin (Chemical Engineering)
1977 B.S. Seoul National University (School of Biochemical and Chemical Engineering)


Associate & Full Professor, Seoul National U. (2004 - )
Senior Researcher, KIST (Korea Institute of Science and Technology) (1989 – 2003)
Japan Society of Polymer Science Fellow (2009-2010)
Visiting Scientist, U. Michigan (Ann Arbor) (2006-2007)
Adjunct professor, Yonsei University (Chemical Engineering Dept.) (1987.3~1988.2)
Visiting Scientist, U. of Wisconsin-Madison (1992.3~1992.4; 1993.12~1995.2; 1995.12~1996.2; 199712.~1998.2; 2003.9~2003.12)
Postdoctoral Fellow, U. of Texas, Austin(1987. 5. – 1989.4)

Research Area

Energy harvesting nanocomposite materials processing (Photoelectric, Piezoelectric, Thermoelectric Materials)
Novel Thermotropic /X-linking liquid crystal polymer composite applications
Polymer processing and Rheology (Electrorheological/Magnetorheological fluids development)
3D printing polymeric nanocomposite materials

Recent Publications (Published more than 170 papers in SCI journals)

* Efficient Vacuum-Deposited Tandem Organic Solar Cells with Fill Factors Higher Than Single-Junction Subcells, Adv. Energy Mat., 5, 228 (2015)
* Nonisothermal crystallization behaviors of nanocomposites of poly(vinylidene fluoride) and multiwalled carbon nanotubes, Polymer, 62, 11 (2015)
* Highly Efficient Vacuum-Processed Organic Solar Cells Containing Thieno[3,2‑b]thiophene-thiazole, J. Phys. Chem. C 118, (2014)
* Resonant Multiple Light Scattering for Enhanced Photon Harvesting in Dye-Sensitized Solar Cells, Advanced Materials 26, 5192 (2014)
* Electrorheological activity generation by graphene oxide coating on low-dielectric silica particles, RSC Adv., 4, 62644 (2014)
* Enhanced charge collection efficiency of dye-sensitized solar cells based on size-tunable hierarchically structured TiO2 beads, J. Mater. Chem. A, 1, 1359–1367 (2013)
* Enhanced Piezoelectric Properties of Electrospun Poly(vinylidene fluoride)/Multiwalled Carbon Nanotube Composites Due to High β‑Phase Formation in Poly(vinylidene fluoride),  J. Phys. Chem. C 117, 11791 (2013)
* Pickering-Emulsion-Polymerized Polystyrene/Fe2O3 Composite Particles and Their Magnetoresponsive Characteristics, Langmuir, 29, 4959 (2013)
* Dispersion and reaggregation of nanoparticles in the polypropylene copolymer foamed by supercritical carbon dioxide, Phys.Chem. Chem. Phys., 15, 11061(2013)
* Core–shell structured graphene oxide-adsorbed anisotropic poly(methyl methacrylate) microparticles and their electrorheology, RSC Advances, 3,11723 (2013)
* Analysis of giant electrorheological fluids, J. Colloid Interf. Sci., 402 ,90–93(2013)
* Modeling and Analysis of Electrorheological Suspensions in Shear Flow, Langmuir, 28, 3077 (2012)
*A simple constitutive model describing the steady state shear viscosity and its prediction of the first normal stress function in shear flow, Polymer,53, 1058 (2012)
* A simplified model for analyzing the flow behavior of electrorheological fluids containing silica nanoparticle-decorated polyaniline nanofibers, Soft Matter, 8, 4659 (2012)
* Low-Temperature Fabrication of TiO2 Electrodes for Flexible Dye-Sensitized Solar Cells Using an Electrospray Process, ACS Appl. Mater. Interfaces, 4, 3308 (2012)
* Aggregation behavior of a polystyrene–b-poly(phenylsilsesquioxane) H-type copolymer at the air/water interface, Polymer, 53, 2223 (2012)
* Core_Shell Structured Carbonyl Iron Microspheres Prepared via Dual-Step Functionality Coatings and Their Magnetorheological Response, ACS Appl. Mater. Interfaces, 3, 3487 (2011)
* Analysis of the flow behavior of electrorheological fluids with the aligned structure reformation, Polymer,52,5695 (2011)
*Enhanced Interfacial Adhesion between an Amorphous Polymer (Polystyrene) and a Semicrystalline Polymer [a Polyamide (Nylon 6)] ACS Appl. Mater. Interfaces, 3, 3487 (2011)
* Electrospray Preparation of Hierarchically-structured Mesoporous TiO2 Spheres for Use in Highly Efficient Dye-Sensitized Solar Cells, ACS Appl. Mater. Interfaces 3, 2622 (2011)
* A new yield stress scaling function for electrorheological fluids, J. Non-Newtonian Fluid Mech. , 166, 241, (2011)