CAJ | 학술논문

以有机碱四甲基氢氧化铵(TMAH)为沉淀剂合成了纳米Fe_3O_4和Co~(2+)掺杂的纳米Fe_3O_4粒子.分别讨论了碱用量,铁盐溶液浓度,反应温度,有机碱及PEG-4000的分散性等因素对纳米Fe_3O_4的形貌影响.结果表明,所合成的纳米Fe_3O_4为30 nm左右的反尖晶石型面心立方结构,有机碱除了起沉淀剂作用,还能够提高纳米Fe_3O_4的分散性.本文还讨论了不同Co~(2+)掺入量的纳米Fe_3O_4粒子的磁性质,结果表明Co~(2+)掺杂的纳米Fe_3O_4粒子的矫顽力在不同掺入量的下有较大的改变.当Co~(2+)掺入量为10.0%时,纳米Fe_3O_4的矫顽力达到最大值,为1628 Oe.
이유궤감사갑기경양화안(TMAH)위침정제합성료납미Fe_3O_4화Co~(2+)참잡적납미Fe_3O_4입자.분별토론료감용량,철염용액농도,반응온도,유궤감급PEG-4000적분산성등인소대납미Fe_3O_4적형모영향.결과표명,소합성적납미Fe_3O_4위30 nm좌우적반첨정석형면심립방결구,유궤감제료기침정제작용,환능구제고납미Fe_3O_4적분산성.본문환토론료불동Co~(2+)참입량적납미Fe_3O_4입자적자성질,결과표명Co~(2+)참잡적납미Fe_3O_4입자적교완력재불동참입량적하유교대적개변.당Co~(2+)참입량위10.0%시,납미Fe_3O_4적교완력체도최대치,위1628 Oe.
Fe_3O_4 nanoparticles and Co~(2+) doped Fe_3O_4 nanoparticles were synthesized by co-precipitation method using tetramethylammonium hydroxide(TMAH)as precipitant.The influence factors such as alkali concentration,iron salt solution concentration,reaction temperature and dispersant agents were studied on the morphorogies of Fe_3O_4 nanoparticles.The synthesized Fe_3O_4 nanoparticles are cubic spinel Fe_3O_4 crystal with an average diameter of 30 nm.The results also show that the addition of the dispersant agent(PEG-4000)can improve the dispersibility of nanoparticles.The magnetic properties of Fe_3O_4 nanoparticles doped with different amount of Co~(2+) were also studied.The results indicate that the coercivity for Co~(2+) doped nanoparticles is greatly improved.The coercivity of Co~(2+) doped Fe_3O_4 nanoparticles reaches to the maximum of 1628 Oe when the Co~(2+) doping is 10%.