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Facile control of morphological characteristics of magnetite aggregates (nFe3O4) by the addition of bifunctional ligands

Authors

  • Sung-Eun Kim,

    1. Department of Chemical and Biochemical Engineering, Gachon University, 1342 SeongnamDaero, Sujeong-Gu, Seongnam-Si, Gyeonggi-do 461-701, South Korea
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  • Sang-Wha Lee

    Corresponding author
    1. Department of Chemical and Biochemical Engineering, Gachon University, 1342 SeongnamDaero, Sujeong-Gu, Seongnam-Si, Gyeonggi-do 461-701, South Korea
    • Phone: +82-317-505360, Fax: +82-317-505363
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Abstract

We demonstrated a facile method to control magnetite clusters with different size and surface morphology by adding bifunctional diamines. First, citrate-capped magnetites (C[BOND]Fe3O4) were prepared by adding citrate ions into ferrofluid during the co-precipitation process. The resulting C[BOND]Fe3O4 was subsequently treated by diamine molecules with different chain lengths (C-4, C-8, C-12), consequently leading to the formation of diamine-linked magnetite aggregates (D[BOND]nFe3O4) with different size and surface morphology. The longer chain length of diamines increased the particle size of D[BOND]nFe3O4 due to the enhanced crosslinking between C[BOND]Fe3O4. The excessive addition of C-4 and C-12 diamines induced the significant morphological changes from irregular-shaped C[BOND]Fe3O4 to spherical and rod-shaped D[BOND]nFe3O4, respectively. Furthermore, D[BOND]nFe3O4 retained their initial magnetism under a strong oxidative process, implicating the potential application to recyclable catalyst or active electrode materials in Li-ion batteries.

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