Systematic control of size, shape and internal structure of monodisperse α-Fe2O3 particles

Tadao Sugimoto, Yinsheng Wang, Hiroyuki Itoh, Atsushi Muramatsu

研究成果: Article査読

191 被引用数 (Scopus)

抄録

The size, shape, and internal structure of monodisperse hematite (α- Fe2O3) particles have been controlled systematically on the basis of the gel-sol method recently developed. The size could be controlled in the range from ca. 2 μm to ca. 0.3 μm without degrading the monodispersity by changing the temperature during the preparation of Fe(OH)3 gel, or to ca. 30 nm by adding different amounts of ultrafine α-Fe2O3 seeds. On the other hand, anions such as Cl-, OH-, SO4/2-, and PO4/3- have remarkably different effects on the shape and internal structure. In this study in particular, the aspect ratio of the ellipsoidal particles was controlled from 1.1 to 5.2 by shape controllers such as sulfate and phosphate ions. It was found at the same time that sulfate ions yielded polycrystalline particles consisting of much smaller subcrystals of a definite orientation, while phosphate produced nearly monocrystalline particles at a reduced concentration of chloride ions. Also, the decrease in concentration of chloride ions and elevation of aging temperature continuously increased the size of the subcrystals of each particle. Finally, it has been shown that fairly uniform nanosized hematite particles can be prepared in large quantities as an application of a new technique for the preparation of the ultrafine α-Fe2O3 seeds. As a result, it has become possible to control the mean size, shape, and internal structure of monodispersed hematite particles independently over a wide range.

本文言語English
ページ(範囲)265-279
ページ数15
ジャーナルColloids and Surfaces A: Physicochemical and Engineering Aspects
134
3
DOI
出版ステータスPublished - 1998 3 31

ASJC Scopus subject areas

  • 表面および界面
  • 物理化学および理論化学
  • コロイド化学および表面化学

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