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Journal of Materials Science

, Volume 43, Issue 14, pp 4737–4741 | Cite as

Morphology control of goethite acicular particles during aging by nitrogen bubbling and subsequent reactive aeration

  • Haruki Kurokawa
  • Mamoru SennaEmail author
Reactivity of SOlids

Abstract

Conditions for synthesizing acicular fine particles of goethite with high aspect ratio were devised by oxidizing mixed slurry comprising ferrous carbonate and hydroxide after neutralizing by alkali carbonate. By bubbling N2 after neutralization into the slurry containing FeCO3 and Fe(OH)2, dissolved CO2 is ejected. As a consequence, the relative concentration of CO 3 2− decreases and that of hydroxide increases. These favor the increase of the aspect ratio of the goethite particles via two factors, i.e., (1) decrease in the critical size of the nuclei and (2) suppression of growth inhibition at the tip of needle-like particles due to CO 3 2− adsorption. We propose a reaction scheme for the entire processing.

Keywords

Goethite Maghemite Ferrous Hydroxide FeCO3 Twin Formation 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.MS Company, Toda Kogyo Co.OtakeJapan
  2. 2.Faculty of Science and TechnologyKeio UniversityYokohamaJapan

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