【摘要】 以间苯二酚和甲醛为反应剂,氨水为催化剂,无水乙醇为分散剂,采用水热法制备酚醛树脂球,然后以酚醛树脂球为模板,以硝酸铁和硝酸锌为原料,制备ZnFe₂O₄铁氧体空心球。对酚醛树脂球的结构、形貌和粒度以及ZnFe₂O₄球的晶体结构、化学组成、微观形貌与磁性能进行表征,研究模板球尺寸对锌铁氧体磁性能的影响。结果表明:随搅拌速度增加或甲醛用量减少,酚醛树脂球的尺寸减小。通过控制反应体系中原料的比例和用量,可得到不同尺寸、表面光滑、球形度高、尺寸均一、单分散性好,表面含有大量羟基官能团的酚醛树脂球。ZnFe₂O₄为结晶良好的立方尖晶石型结构,为规则的空心球,分散性好、尺寸均一。随模板尺寸减小,ZnFe₂O₄球的尺寸逐渐减小,呈现出铁磁性向顺磁性的转变,饱和磁化强度（Ms）增加。当模板尺寸为271.8 nm时,ZnFe₂O₄纳米空心球的饱和磁化强度为5.4 （A·m²）/kg。更多还原

【Abstract】 The phenolic resin microspheres using resorcinol and formaldehyde as reactants, ammonia as catalyst and anhydrous ethanol as dispersant were prepared by hydrothermal method. The hollow ferrite was prepared templated by phenolic resin microspheres, using ferric nitrate and zinc nitrate, ferric chloride and zinc chloride as precursors,respectively. The structure, morphology and particle size of phenolic resin spheres, as well as the crystal structure,chemical composition, micromorphology and magnetic properties of ZnFe₂O₄ spheres were characterized. The effect of template sphere size on the magnetic properties of zinc ferrite was investigated. The results show that the size of the phenolic resin sphere decreases with the stirring speed increasing or the amount of formaldehyde decreasing. The phenolic resin balls of different sizes can be obtained by controlling the proportion and amount of raw materials in the reaction system, the spherical surface is smooth, the sphericity is high, the size is uniform, and the monodispersity is good,and the surface contains a large amount of hydroxyl functional groups. Zn Fe2 O4 is a well-crystallized cubic spinel structure, which is a regular hollow sphere with good dispersibility and uniform size. As the size of the template decreases, the size of the ZnFe₂O₄ sphere gradually decreases, and it turn out the ferromagnetism transit to paramagnetic,and the saturation magnetization（Ms） gradually increases. When the template size is 271.8 nm, the saturation magnetization of the ZnFe₂O₄ sphere is 5.4（A·m²）/kg.更多还原