The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions
The effect of organic phosphonate-based additives on a-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...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Royal Society of Chemistry
2003
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| Online Access: | http://www.rsc.org/Publishing/Journals/CE/article.asp?doi=b302911e http://hdl.handle.net/20.500.11937/9919 |
| _version_ | 1848746088159248384 |
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| author | Jones, Franca Ogden, Mark Oliveira, Allan Parkinson, Gordon Richmond, William |
| author_facet | Jones, Franca Ogden, Mark Oliveira, Allan Parkinson, Gordon Richmond, William |
| author_sort | Jones, Franca |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The effect of organic phosphonate-based additives on a-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 L21, and with Fe : additive ratios ranging from w8000 : 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 (214 ) 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 akaganeite and hematite phases may both precipitate from the ferric chloride solution, with akaganeite apparently forming more rapidly than hematite. Inhibition of hematite formation by addition of the phosphonate additive can lead to b-FeOOH (akaganeite) being the dominant product phase, provided the concentration of Fe31 in solution is above the equilibrium solubility of the akaganeite phase. |
| first_indexed | 2025-11-14T06:27:41Z |
| format | Journal Article |
| id | curtin-20.500.11937-9919 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:27:41Z |
| publishDate | 2003 |
| publisher | Royal Society of Chemistry |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-99192019-02-19T05:35:33Z The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions Jones, Franca Ogden, Mark Oliveira, Allan Parkinson, Gordon Richmond, William akaganite hematite nanoparticle phosphonate The effect of organic phosphonate-based additives on a-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 L21, and with Fe : additive ratios ranging from w8000 : 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 (214 ) 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 akaganeite and hematite phases may both precipitate from the ferric chloride solution, with akaganeite apparently forming more rapidly than hematite. Inhibition of hematite formation by addition of the phosphonate additive can lead to b-FeOOH (akaganeite) being the dominant product phase, provided the concentration of Fe31 in solution is above the equilibrium solubility of the akaganeite phase. 2003 Journal Article http://hdl.handle.net/20.500.11937/9919 http://www.rsc.org/Publishing/Journals/CE/article.asp?doi=b302911e http://xlink.rsc.org/?DOI=b302911e Royal Society of Chemistry fulltext |
| spellingShingle | akaganite hematite nanoparticle phosphonate Jones, Franca Ogden, Mark Oliveira, Allan Parkinson, Gordon Richmond, William The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions |
| title | The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions |
| title_full | The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions |
| title_fullStr | The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions |
| title_full_unstemmed | The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions |
| title_short | The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions |
| title_sort | effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions |
| topic | akaganite hematite nanoparticle phosphonate |
| url | http://www.rsc.org/Publishing/Journals/CE/article.asp?doi=b302911e http://www.rsc.org/Publishing/Journals/CE/article.asp?doi=b302911e http://hdl.handle.net/20.500.11937/9919 |