Electrically Conducting Silk Fibroin Microspheres by Incorporation of Multiwalled Carbon Nanotubes on their Surfaces

Seok Ho Yoon; Min Sung Kang; Hun Sik Kim; Hyoung Joon Jin

doi:10.4028/www.scientific.net/MSF.544-545.977

Paper Titles

Densification and Dielectric Properties of Glass/Ceramic Composites Sintered with Various Borosilicate Glass
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Design of Manufacturing Process of Oxygen-Free High Conductivity Copper Using Mahalanobis-Distance Outlier Detection Method
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Development of Honeycomb-Type Solid Oxide Fuel Cell Consisting of LaGaO₃ Electrolyte
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Effect of Metal Additives (Co and Ni) on the Electrochemical Properties of Lithium/FeS₂ Batteries
p.973

Electrically Conducting Silk Fibroin Microspheres by Incorporation of Multiwalled Carbon Nanotubes on their Surfaces
p.977

Electrochemical Influence of Collagen Piezoelectric Effect in Bone Healing
p.981

Electrochemical Properties of Perovskite Cathode for Solid Oxide Fuel Cell
p.985

Evaluation on Some Metallic Alloys for SOFC Interconnect
p.989

Experimental Study on the Effects of the Performance of Polymer Electrolyte Membrane Fuel Cell
p.993

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Electrically Conducting Silk Fibroin Microspheres by Incorporation of Multiwalled Carbon Nanotubes on their Surfaces

Abstract:

Electrorheological (ER) particles were obtained by the adsorption of multiwalled carbon nanotubes (MWCNT) on the surface of silk fibroin microspheres. The resulting spherical polymeric microspheres consist of a silk fibroin core and an MWCNT shell, which is electrically conducting. The silk fibroin microspheres were prepared by the phase separation of the silk fibroin and poly(ethylene oxide) (PEO) blend solution, and the MWCNT dispersion was prepared by ultrasonication with cetyltrimethylammonium bromide (CTAB) surfactant. The ER particles were prepared using a simple process involving the blending of the silk fibroin microsphere suspension and aqueous MWCNT dispersion. The morphology of the ER particles was examined by field emission scanning electron microscopy (FESEM) and their electrical conductivity measured by the four-probe method was 4.8×10-4 S/cm. The prepared composite microspheres suspended in silicone oil showed typical ER characteristics, including the formation of a chain-like structure under an applied electric field (1.9 kV/mm). This phenomenon can be explained by the interfacial polarizability of the MWCNTs adsorbed on the surface of the polymeric microspheres.