Synthesis of Conducting Polymers-coated Hollow TiO2 Nanoparticles for Improved Electrorheological Performance

초록

In this study, conducting polymers, polythiophene (PT), polypyrrole (PPy), and polyaniline (PANI) were coated onto hollow TiO2nanoparticles (HTNPs) to enhance ER performance. The HTNPs are synthesized by removing the silica core from SiO2/TiO2 core/shell nanoparticles (STCSNPs) via etching and redeposition. Vapor deposition polymerization was used to coat HTNPs with three conducting polymers, resulting in PT/HTNPs, PPy/HTNPs, and PANI/HTNPs. Moreover, the shear stress of PT/HTNPs-, PPy/HTNPs-, and PANI/HTNPs-based ER fluids were measured as ca. 90.3, 58.7, and 19.8 Pa, corresponding to increases of 9.5, 6.2, and 2.2 times increases. This enhancement is attributed to the improved polarization effect, which results from space charges generated from conducting polymer layers. Consequently, the synergy of the hollow structure and the conducting polymer coatings enhanced ER performance. 본 연구는 2025년 정부(방위사업청)의 재원으로 국방과학연구소의 지원을 받아 수행된 미래도전국방기술 연구개발사업임(No.915066201).