Controlled formation of ultrafine nickel particles on well-defined hematite particles

Atsushi Muramatsu, Shin ichiro Ichikawa, Tadao Sugimoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Ultrafine metallic Ni particles were precipitated on well-defined hematite particles of different shapes (spindles, pseudocubes, spheres, and platelets) by reducing nickel acetylacetonate with NABH4 in the presence of these carriers (molar ratio of Ni/hematite, 1/20) in 2-propanol at 355 K for 10 min. The deposited amorphous Ni particles on spindle-type, pseudocubic and spherical hematites were about 4 nm in mean diameter and of narrow size distribution. They were free from nickel boride, as determined by X-ray diffractometry and electron microscopy in combination with heat treatment of the powder at 673 K for 2 h in N2 atmosphere. On hexagonal hematite platelets, the deposited Ni particles were larger (i.e. about 20 nm) and of a much broader size distribution than those on the other types of hematite. It appears that the rough surfaces of the spindle-type, pseudocubic, and spherical carriers favor the stabilization of Ni particles in contrast to the smooth surface of the platelet-type hematite. The formation mechanism of the ultrafine Ni on colloidal hematite is discussed.

Original languageEnglish
Pages (from-to)29-35
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume82
Issue number1
DOIs
Publication statusPublished - 1994 Jan 17

Keywords

  • Hematite particles
  • NABH
  • Nickel particles
  • Surface roughness

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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