NDLI: The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed <i>via</i> acid hydrolysis of ferric chloride solutions

Content Provider	Royal Society of Chemistry (RSC)
Author	Ogden, Mark I. Jones, Franca Richmond, William R. Oliveira, Allan Parkinson, Gordon M.
Copyright Year	2003
Abstract	The effect of organic phosphonate-based additives on α-Fe2O3 (hematite) crystallization via the forced hydrolysis of ferric chloride solutions has been studied using a range of additives containing 2, 3 or 4 pendant phosphonate groups. The hydrolysis reactions were carried out at pH 1.1 with an iron concentration of 0.01 mol L−1, and with Fe ∶ additive ratios ranging from >8000 ∶ 1 down to 200 ∶ 1. In the absence of additive, the hematite particles are very uniform rhombic single crystals, with an average length of ≈100 nm. In the presence of phosphonates the particles become hexagonal, with the additives acting by inhibiting growth at (2) faces. At Fe ∶ additive ratios lower than about 200 ∶ 1, hematite formation is completely inhibited. Our results are consistent with a mechanism in which the akaganéite and hematite phases may both precipitate from the ferric chloride solution, with akaganéite apparently forming more rapidly than hematite. Inhibition of hematite formation by addition of the phosphonate additive can lead to β-FeOOH (akaganéite) being the dominant product phase, provided the concentration of Fe3+ in solution is above the equilibrium solubility of the akaganéite phase.
Starting Page	159
Ending Page	163
Page Count	5
File Format	HTM / HTML PDF
ISSN	14668033
Volume Number	5
Issue Number	30
Journal	CrystEngComm
DOI	10.1039/b302911e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hematite Hydrolysis Iron(III) chloride PH Rhombus Phosphonate Akaganéite
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Materials Science

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