| 3 | Significantly enhancing fracture toughness of epoxy composite with promisingγ-FeOOH@Fe_(2)O_(3)hybrid nanoparticles by magnetic field assistance显示文摘The toughening of epoxy resin(EP)and the interlaminar toughening of carbon fiber reinforced composite(CF/EP)laminates have been widely concerned.In this work,the needle-likeγ-FeOOH nanoparticles were prepared by liquid phase deposition-air oxidation method,and then were calcined under different conditions to obtainγ-FeOOH andγ-Fe_(2)O_(3) hybrid nanoparticles(γ-FeOOH@Fe_(2)O_(3)).Effect of calcination condition ofγ-FeOOH@-Fe_(2)O_(3) and magnetic field assistance on fracture toughness(KIC)of EP was systematically investigated.Then the selectedγ-FeOOH@Fe_(2)O_(3) with the best toughening effect were used to improve the mode I interlaminar fracture toughness(GIC)of CF/EP laminate.The resultingγ-FeOOH@Fe_(2)O_(3) have a length of around 1μm,a diameter of around 100 nm and the Ms of 8.99–45.96 emu/g.After calcinated at 250℃ for 1 h,theγ-FeOOH@Fe_(2)O_(3) containing 24 wt%FeOOH and 76 wt%Fe_(2)O_(3) achieved the best toughening effect.Under a magnetic field of 0.09 T,the KIC of theγ-FeOOH@Fe_(2)O_(3)/EP composite(2.45 MPa m^(1/2)) is 81.7%and 66.7%higher than that of neat epoxy and the composite without magnetic field induction,respectively.Furthermore,the GIC of theγ-FeOOH@Fe_(2)O_(3)/CF/EP composite(0.914 kJ/m^(2)) is also significantly increased by 88.8%and 51.8%compared to that of CF/EP and the corresponding composite without magnetic field induction,respectively. | Guan Chen Chuanguo Ma Zehao Fu Jing Wang Peibang Dai | 2022 | Nano Materials Science2022，4，2： | 1 |
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