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Influence of solution pH on the formation of iron oxide nanoparticles

Iron oxide phase orientation were highly influenced by solution pH, crystalline structure, purity, surface enrichment, particle size, and morphology. This paper investigates the influence of pHchanges by varying the precursor anions of chloride (FeCl2) and sulphate (FeSO4) on the formation of iron o...

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Main Authors: Suppiah, Durga Devi, Johan, Mohd Rafie
Format: Article
Language:English
Published: IOP Publishing 2019
Subjects:
Q Science (General)
QD Chemistry
Online Access:http://eprints.um.edu.my/24061/1/Influence%20of%20solution%20pH%20on%20the%20formation%20of%20iron%20oxide%20nanoparticles.pdf
http://eprints.um.edu.my/24061/
https://doi.org/10.1088/2053-1591/aae428
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spelling my.um.eprints.240612020-03-26T03:50:45Z http://eprints.um.edu.my/24061/ Influence of solution pH on the formation of iron oxide nanoparticles Suppiah, Durga Devi Johan, Mohd Rafie Q Science (General) QD Chemistry Iron oxide phase orientation were highly influenced by solution pH, crystalline structure, purity, surface enrichment, particle size, and morphology. This paper investigates the influence of pHchanges by varying the precursor anions of chloride (FeCl2) and sulphate (FeSO4) on the formation of iron oxide nanoparticles using one step controlled precipitation technique. The obtained titration curve provided vital information on the reaction mechanism whereby different hydrolysis rate of precursor leads to different iron oxide phases. It was determined that at pH 4, goethite (α-FeOOH) was obtained. Continuous addition of hydroxyl ions (OH−) then forms iron hydroxides (Fe(OH)2) which will then subsequently react with the goethite precipitating magnetite (Fe3O4) nanoparticles (35–45 nm) atpH 10 with ferromagnetic behavior. By the use of Cl− anion, the slower hydrolysis process induced requires more hydroxyl ions to reach pHequilibrium leading to larger maghemite nanoparticles (50–60 nm). Spectroscopic analysis via Raman and FTIR analysis confirms the phases obtained. SEM andTEMimaging shows the correlation of structure orientation anisotropy which influenced the magnetic properties. Spherical magnetite nanoparticles strong dipolar interaction have higher coercivity (117G) and remanence (12 emu g−1) compared to the synthesised maghemite spinel needle-like structure nanoparticles. The understanding of the iron oxide structure directing effect by complex pH solution mechanism was essential for not only to prepare different forms of iron oxide and hydroxides but also controlled synthesis reproducibility. IOP Publishing 2019 Article PeerReviewed text en http://eprints.um.edu.my/24061/1/Influence%20of%20solution%20pH%20on%20the%20formation%20of%20iron%20oxide%20nanoparticles.pdf Suppiah, Durga Devi and Johan, Mohd Rafie (2019) Influence of solution pH on the formation of iron oxide nanoparticles. Materials Research Express, 6 (1). 015008. ISSN 2053-1591 https://doi.org/10.1088/2053-1591/aae428 doi:10.1088/2053-1591/aae428
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
language English
topic Q Science (General)
QD Chemistry
spellingShingle Q Science (General)
QD Chemistry
Suppiah, Durga Devi
Johan, Mohd Rafie
Influence of solution pH on the formation of iron oxide nanoparticles
description Iron oxide phase orientation were highly influenced by solution pH, crystalline structure, purity, surface enrichment, particle size, and morphology. This paper investigates the influence of pHchanges by varying the precursor anions of chloride (FeCl2) and sulphate (FeSO4) on the formation of iron oxide nanoparticles using one step controlled precipitation technique. The obtained titration curve provided vital information on the reaction mechanism whereby different hydrolysis rate of precursor leads to different iron oxide phases. It was determined that at pH 4, goethite (α-FeOOH) was obtained. Continuous addition of hydroxyl ions (OH−) then forms iron hydroxides (Fe(OH)2) which will then subsequently react with the goethite precipitating magnetite (Fe3O4) nanoparticles (35–45 nm) atpH 10 with ferromagnetic behavior. By the use of Cl− anion, the slower hydrolysis process induced requires more hydroxyl ions to reach pHequilibrium leading to larger maghemite nanoparticles (50–60 nm). Spectroscopic analysis via Raman and FTIR analysis confirms the phases obtained. SEM andTEMimaging shows the correlation of structure orientation anisotropy which influenced the magnetic properties. Spherical magnetite nanoparticles strong dipolar interaction have higher coercivity (117G) and remanence (12 emu g−1) compared to the synthesised maghemite spinel needle-like structure nanoparticles. The understanding of the iron oxide structure directing effect by complex pH solution mechanism was essential for not only to prepare different forms of iron oxide and hydroxides but also controlled synthesis reproducibility.
format Article
author Suppiah, Durga Devi
Johan, Mohd Rafie
author_facet Suppiah, Durga Devi
Johan, Mohd Rafie
author_sort Suppiah, Durga Devi
title Influence of solution pH on the formation of iron oxide nanoparticles
title_short Influence of solution pH on the formation of iron oxide nanoparticles
title_full Influence of solution pH on the formation of iron oxide nanoparticles
title_fullStr Influence of solution pH on the formation of iron oxide nanoparticles
title_full_unstemmed Influence of solution pH on the formation of iron oxide nanoparticles
title_sort influence of solution ph on the formation of iron oxide nanoparticles
publisher IOP Publishing
publishDate 2019
url http://eprints.um.edu.my/24061/1/Influence%20of%20solution%20pH%20on%20the%20formation%20of%20iron%20oxide%20nanoparticles.pdf
http://eprints.um.edu.my/24061/
https://doi.org/10.1088/2053-1591/aae428
_version_ 1662755217451515904
score 13.244369

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