Triple bonds are versatile ligands for organometallic compounds [69]. Thus, CPs containing
triple bonds are promising candidates for fabricating organometallic materials. The hyperbranched
PTPE 35 is converted to organometallic polymer 35-{[Co(CO)3]2}x at room temperature, which
transforms into magnetic nanoparticles MC35 (Scheme in Figure 4) [Error! Bookmark not
defined.]. Transmission electron microscopic images show that the Co nanoparticles are wrapped
in a carboneous shell (Figure 4A and 4C), while the electron diffraction patterns shown in Figures
4B and 4D demonstrate the crystalline nature of MC35. Thanks to the ferromagnetic nature of
cobalt, MC35 is magnetic as well. As shown in Figure 4E, with an increase in the external
magnetic field strength, the magnetization of MC35 rapidly increases and reaches a saturation
value of 82.7 emu/g ultimately at high field. Giving that the oxides of Co (CoO and Co3O4) are
paramagnetic at room temperature, the carboneous shells efficiently prevent the Co
nanocrystallites from oxidation. The coercivity is calculated to be 0.08 kOe, suggesting that the
ceramics can be utilized as soft magnetic materials for magnetic recording systems.
Triple bonds are versatile ligands for organometallic compounds [69]. Thus, CPs containingtriple bonds are promising candidates for fabricating organometallic materials. The hyperbranchedPTPE 35 is converted to organometallic polymer 35-{[Co(CO)3]2}x at room temperature, whichtransforms into magnetic nanoparticles MC35 (Scheme in Figure 4) [Error! Bookmark notdefined.]. Transmission electron microscopic images show that the Co nanoparticles are wrappedin a carboneous shell (Figure 4A and 4C), while the electron diffraction patterns shown in Figures4B and 4D demonstrate the crystalline nature of MC35. Thanks to the ferromagnetic nature ofcobalt, MC35 is magnetic as well. As shown in Figure 4E, with an increase in the externalmagnetic field strength, the magnetization of MC35 rapidly increases and reaches a saturationvalue of 82.7 emu/g ultimately at high field. Giving that the oxides of Co (CoO and Co3O4) areparamagnetic at room temperature, the carboneous shells efficiently prevent the Conanocrystallites from oxidation. The coercivity is calculated to be 0.08 kOe, suggesting that theceramics can be utilized as soft magnetic materials for magnetic recording systems.
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