Direct transformation from goethite to magnetite nanoparticles by mechanochemical reduction

Iwasaki, Takashi; Sato, Nami; Kosaka, Kazunori; Watano, Satoru; Yanagida, Takeshi; Kawai, Tomoji

doi:10.1016/j.jallcom.2010.10.029

Cited by 29 publications

(19 citation statements)

References 41 publications

(43 reference statements)

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“…The reaction kinetics was favoured by milling energy (rotation speed). 688a In a subsequent paper, the same group of researchers 689 reported direct synthesis of nanosized magnetite starting from a-FeOOH. The hydrogen formed due to the rusting of media/mill reduces the ferric iron to ferrous state which is then hydrolyzed to Fe(OH) 2 and participates in the reaction of magnetite formation.…”

Section: Role Of Water In Mechanochemistrymentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

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Section: Role Of Water In Mechanochemistrymentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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“…14 to α-Fe 2 O 3 have been addressed in a detailed manner in the literature. [14][15][16][17][18][19][20] In addition to α-Fe 2 O 3, indication for the formation of Fe 3 O 4 in a small concentration has also been reported due to dehydration of α-FeOOH 14 based on low temperature induced magnetization studies. α-FeOOH has been reported to be reduced to magnetite directly by mechano chemical means by ball milling treatment 15 which was understood mainly due to hydrogen gas generated during the milling process.…”

Section: Introductionmentioning

confidence: 99%

Atomic scale study of thermal reduction of nano goethite coexisting with magnetite

et al. 2013

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Evolution of the local structure and magnetic properties of nano particles of goethite having magnetite as a composite due to controlled annealing treatments in vacuum has been studied using Mossbauer spectroscopy. Importance of size, defect associated with structural OH- for the observed structural and magnetic properties of goethite has been emphasized in this study. Present Mossbauer results show that thermal annealing at low temperatures (420-550 K) lead to a partial conversion / reduction of orthorhombic goethite to cubic spinel oxides such as maghemite and off-stochiometric magnetite. This study further establishes that annealing treatments beyond 650 K predominantly results in topotactic conversion of goethite to haematite. Underlying physics of the transitions of goethite to iron oxides and the important role of desorbed hydrogen for the orthorhombic to cubic structural transitions has been elucidated in this study.

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“…During the past years, multifunctional magnetic core-shell nanoparticles [1] have attracted increasing attention due to their various applications in biological and chemical fields such as catalysis [2], magnetic resonance imaging [3], enzyme and protein immobilization [4], target-drug delivery [5], clinical diagnosis [6] and magnetic biological separation [7].…”

Section: Introductionmentioning

confidence: 99%