화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.105, 473-480, January, 2022
DOI10.1016/j.jiec.2021.10.002  Export Citation
Magnetic cluster-encapsulated polymer dimers with controlled surface property
Da In Kim1, Hye Ji Kim1, 2, Ju Hyang Park1, Ki Hak Kim1, Hosu Kang1, Jongbok Kim3, 4, Ping Lu5, Hyungju Ahn2, †, and Dong Choon Hyun1, †
  • 1Department of Polymer Science and Engineering, Kyungpook National University, Daegu 41566, South Korea
  • 2Pohang Accelerator Laboratory, POSTECH, Pohang 37673, South Korea
  • 3Department of Materials Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, South Korea
  • 4Department of Energy Engineering, Convergence, Kumoh National Institute of Technology, Gumi 39177, South Korea
  • 5Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, NJ 08028, United States, USA
E-mail:,
This work reports the fabrication of magnetic polymer dimers with controlled surface anisotropy. The fabrication process involves the preparation of magnetite (Fe3O4) magnetic clusters with strong magnetism, followed by their surface modification, dispersion polymerization while using them as seeds, multilayer shell formation via layer-by-layer deposition, and polymer core swelling. The interplay between the swelling and multilayer shells generates pressure inside the multilayer-deposited, magnetic polystyrene (PS) spheres, forming structurally anisotropic dimers with single PS protrusions anchored on the multilayer surfaces within minutes. The use of titania precursor and different swelling agents, along with the change in the composition of the multilayer shell, enables the introduction of different surface anisotropies, such as the surface-charge anisotropy, anisotropic hydrophilicity/hydrophobicity, and material composition anisotropy, to the dimers. The strong magnetic response of the dimers, attributed to the magnetic cluster seeds, in combination with the surface-charge and material composition anisotropies allows a rapid magnetic recovery and an excellent reusability, enabling their application to 20- cycled reduction of 4-nitrophenol (4-NP) and methylene blue (MB) without loss of catalytic activity. Furthermore, the anisotropic hydrophilicity/hydrophobicity makes the dimers potentially useful as solid surfactant to stabilize immiscible oil.water mixture.
Keywords:Dimer;Surface anisotropy;Magnetic polymer colloid;Seeded dispersion polymerization;Controlled surface property
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