Crystal architectures of a layered silicate on monodisperse spherical silica particles cause the topochemical expansion of the core-shell particles
Crystal architectures of a layered silicate on monodisperse spherical silica particles cause the topochemical expansion of the core-shell particles
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DOI：
10.1016/j.micromeso.2015.05.018
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发表时间：
2015-10
影响因子：
5.2
通讯作者：
Tomohiko Okada;Asuka Suzuki;Shiho Yoshido;Hikari M. Minamisawa
中科院分区：
文献类型：
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作者：
Tomohiko Okada;Asuka Suzuki;Shiho Yoshido;Hikari M. Minamisawa
在各向同性和单分散微球上发生的可膨胀层状硅酸盐（指向轴）的各向异性结构变化通过可测量的晶粒尺寸的增加来检测。通过在直径为1.0 μm的单分散球形二氧化硅颗粒上追求可膨胀层状硅酸盐晶体的复杂生长，观察到了层次变化；在373 K的碱性条件下，将胶体悬浮液中的球形二氧化硅颗粒与锂离子和镁离子反应，成功制备出晶粒尺寸均匀的核壳杂化物。随着初始混合物中锂离子含量的降低，核壳颗粒的尺寸分布趋于均匀。二十二烷基二甲基铵离子通过阳离子交换反应插入到小晶体中，扩大了层间空间，在拓扑化学上增加了晶粒尺寸，而核壳颗粒的形状没有发生任何变化。
Anisotropic structural changes in an expandable layered silicate (directed towards thec–axis) occurring on isotropic and monodisperse microspheres were detected by measurable increases in the grain size. The hierarchical changes were observed through pursing the sophisticated growth of expandable layered silicate crystals on monodisperse spherical silica particles with diameters of 1.0 μm; the core–shell hybrids with a quite uniform grain size were successfully produced using a rotating Teflon-lined autoclave by reacting spherical silica particles in a colloidal suspension with lithium and magnesium ions under alkaline conditions at 373 K. The size distribution of the core-shell particles tended to be uniform when the amount of lithium ions in the initial mixture decreased. The intercalation of dioctadecyldimethylammonium ions into the small crystals through cation-exchange reactions expanded the interlayer space, topochemically increasing the grain size without any change occurring in the shapes of the core–shell particles.