A facile synthesis and characterization of monodisperse spherical pigment particles with a core/shell structnre
A facile synthesis and characterization of monodisperse spherical pigment particles with a core/shell structnre
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DOI：
10.1002/adfm.200600775
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发表时间：
2007-06-18
影响因子：
19
通讯作者：
Lin, Jun
中科院分区：
文献类型：
--
作者：
Lin, Cuikun;Li, Yinyan;Lin, Jun
本文报道了一种简单的溶胶-凝胶法制备具有核/壳结构的单分散、球形、无团聚的颜料颗粒。选择直径为245 nm和385 nm的球形二氧化硅颗粒和Cr2O、α-Fe2O3、ZnCo2O4、CuFeCrO4、MgFe2O4和CoAl2O4颜料分别作为核和壳。用X射线衍射仪(X射线衍射仪)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、紫外-可见漫反射(UV-Vis)对所得的核壳结构颜料样品进行了表征，分别为：SiO_2@Cr2O_3(绿色)、SiO_2@α-Fe_2O_3(红色)、SiO_2@MgFe_2O_4(棕色)、SiO_2@ZnCo_2O_4(深绿色)、SiO_2@CoAl_2O_4(蓝色)和SiO_2@CuFeCrO_4(黑色)。X-射线衍射仪和高分辨电子显微镜(HRTEM)结果表明，颜料壳层在二氧化硅颗粒表面结晶良好。颜料外壳的厚度在一定程度上可以通过涂层的数量进行调整。这些颜料颗粒可以很好地分散在一些溶剂(如乙二醇)中，形成相对更稳定的悬浮液，而不是商用产品。除了颜色特性外，SiO_2@Cr2O_3、SiO_2@MgFe_2O_4和SiO_2@CuFeCrO_4等颜料还具有磁性能，分别为1098Oe(5K)、648Oe(5K)和91Oe(298K)。
In this paper, a facile sol-gel process for producing monodisperse, spherical, and nonaggregated pigment particles with a core/shell structure is reported. Spherical silica particles (245 and 385 nm in diameter) and Cr2O3, alpha-Fe2O3, ZnCo2O4, CuFeCrO4, MgFe2O4, and CoAl2O4 pigments are selected as cores and shells, respectively. The obtained core/shell-structured pigment samples, denoted as SiO2@Cr2O3 (green), SiO2@alpha-Fe2O3 (red), SiO2@MgFe2O4 (brown), SiO2@ZnCo2O4 (dark green), SiO2@CoAl2O4 (blue), and SiO2@CuFeCrO4 (black), are well characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and UV-vis diffuse reflection, as well as by investigating the magnetic properties. The results of XRD and high-resolution TEM (HRTEM) demonstrate that the pigment shells crystallize well on the surface Of SiO2 Particles. The thickness of the pigment shell can be tuned by the number of coatings, to some extent. These pigment particles can be well dispersed in some solvents (such as glycol) to form relatively more stable suspensions than the commercial products. Apart from the color characteristics, some of pigments like SiO2@Cr2O3, SiO2@MgFe2O4, and SiO2@CuFeCrO4 also show magnetic properties with coercivities of 1098 Oe (5 K), 648 Oe (5 K), and 91 Oe (298 K), respectively.