scispace - formally typeset
Search or ask a question

Showing papers on "Iron oxide published in 2018"


Journal ArticleDOI
01 Nov 2018
TL;DR: In this paper, a photocatalytic approach based on TiO2-supported iron oxide species is described, which affords methanol in high yield and selectivity at ambient conditions.
Abstract: Methane activation under moderate conditions and with good selectivity for value-added chemicals still remains a huge challenge. Here, we present a highly selective catalyst for the transformation of methane to methanol composed of highly dispersed iron species on titanium dioxide. The catalyst operates under moderate light irradiation (close to one Sun) and at ambient conditions. The optimized sample shows a 15% conversion rate for methane with an alcohol selectivity of over 97% (methanol selectivity over 90%) and a yield of 18 moles of alcohol per mole of iron active site in just 3 hours. X-ray photoelectron spectroscopy measurements with and without xenon lamp irradiation, light-intensity-modulated spectroscopies, photoelectrochemical measurements, X-ray absorption near-edge structure and extended X-ray absorption fine structure spectra, as well as isotopic analysis confirm the function of the major iron-containing species—namely, FeOOH and Fe2O3, which enhance charge transfer and separation, decrease the overpotential of the reduction reaction and improve selectivity towards methanol over carbon dioxide production. Methanol synthesis from methane is a promising route to valorize this abundant natural gas, but existing thermal processes require harsh reaction conditions. Now, a photocatalytic approach based on TiO2-supported iron oxide species is described, which affords methanol in high yield and selectivity at ambient conditions.

304 citations


Journal ArticleDOI
TL;DR: In this paper, a co-precipitation method was used for the removal of Cr(VI), Cu(II), and Cd(II) ions from aqueous solution in batch mode.

190 citations


Journal ArticleDOI
TL;DR: In this article, Daphne mezereum extract was used as reducing and stabilizing agent for the synthesis of iron oxide nanoparticles (IONPs) for dye removal.
Abstract: Green synthetic method is an important process that can be used for the synthesis of iron nanoparticles in the field of nanotechnology because of its characteristics of low cost and high efficiency for industrial large-scale production. In this study, iron oxide nanoparticles (IONPs) were synthesized by a simple bio-reduction method. Aqueous leaf extract of Daphne mezereum was used as a reducing and stabilizing agent. Ultraviolet–visible (UV–vis) absorption spectroscopy was used to monitor the dye removing ability of IONPs. Also, IONPs were characterized by transmission electron microscopy (TEM), particle size analysis (PSA), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffractometer (XRD), vibrating sample magnetometer (VSM), and thermo gravimetric analysis (TGA). The average diameter of the prepared NPs ranged from 6.5 to 14.9 nm with a mean particle size of 9.2 nm. In addition, the synthesized iron nanoparticles were tested for dye removing activities. The decoloration efficiency of INPs catalyzed reaction was about 81% after 6 h. Thus, it could be concluded that D. mezereum aqueous leaf extract can be used efficiently in the production of iron oxide NPs for commercial applications in environmental fields.

185 citations


Journal ArticleDOI
TL;DR: Two distinct therapeutic approaches, related to high dosage allowing MHT and low dosage associated with PTT, are identified and it is demonstrated that PTT mediated by magnetic nanoparticles has an efficacy that is comparable to that of plasmonic nanoparticles, but only at significant nanoparticle dosages.

158 citations


Journal ArticleDOI
TL;DR: In this paper, the removal of toxic lead, cadmium, and arsenic using iron oxide modified clay-activated carbon composite beads from aqueous solutions was addressed, and the specific surface area of the composite beads was found to be 433m2/g.

155 citations


Journal ArticleDOI
TL;DR: In this article, a review of the synthesis of iron oxide (Fe2O3 and Fe3O4) nanomaterials with various structures, including 1D (nanorods, nanowires, and nanotubes), 2D (nosheets) and 3D(nanospheres, hollow nanostructures, flower-like structures, and nanoarrays).
Abstract: Lithium-ion batteries and supercapacitors have great potential as power supplies in portable electronic devices and electric vehicles. Their performance depends greatly on the properties of electrode materials. Many attempts have been devoted to the development of new electrode materials with advanced electrochemical performances. Due to their high theoretical specific capacitance, low cost and non-toxicity, iron-based materials are considered as very promising candidates for anode materials. However, low electrical conductivity and poor cycle stability are two major problems plaguing iron-based materials. Nanomaterial design has emerged as a promising solution to these fundamental issues in LIBs and SCs. Here, we review the synthesis of iron oxide (Fe2O3 and Fe3O4) nanomaterials with various structures, including 1D (nanorods, nanowires, and nanotubes), 2D (nanosheets) and 3D (nanospheres, hollow nanostructures, flower-like structures, and nanoarrays). Nanocomposites, consisting of iron oxides and different supports (such as carbonaceous materials, other metal oxides, and polymers), are also covered in this review. Furthermore, the synthesis and structural characteristics of iron hydroxides (FeOOH) and iron sulfides (FeS2) will also be elaborated. Finally, applications of iron-based nanomaterials in LIBs and SCs are summarized. Ultimately, we wish to provide an in-depth and reasonable understanding of how to effectively improve the electrochemical performance of iron-based anodes by selecting suitable nanostructures and optimizing their chemical compositions. Hopefully, these concepts and strategies can be extended to other nanomaterials, as a reference for future development in the areas of energy conversion, storage and environmental protection.

146 citations


Journal ArticleDOI
TL;DR: In this paper, a highly active, selective, and stable catalyst for the hydrogenation of CO2 to short chain olefins was synthesized in one single step by using a metal organic framework as catalyst precursor.
Abstract: We report the synthesis of a highly active, selective, and stable catalyst for the hydrogenation of CO2 to short chain olefins in one single step by using a metal organic framework as catalyst precursor. By studying the promotion of the resulting Fe(41 wt %)-carbon composites with different elements (Cu, Mo, Li, Na, K, Mg, Ca, Zn, Ni, Co, Mn, Fe, Pt, and Rh), we have found that only K is able to enhance olefin selectivity. Further catalyst optimization in terms of promoter loading results in catalysts displaying unprecedented C2–C4 olefin space time yields of 33.6 mmol·gcat–1·h–1 at XCO2 = 40%, 320 °C, 30 bar, H2/CO2 = 3, and 24 000 mL·g–1·h–1. Extensive characterization demonstrates that K promotion affects catalytic performance by (i) promoting a good balance between the different Fe active phases playing a role in CO2 hydrogenation, namely, iron oxide and iron carbides and by (ii) increasing CO2 and CO uptake while decreasing H2 affinity, interactions responsible for boosting olefin selectivity.

139 citations


Journal ArticleDOI
TL;DR: In this review, analysis reveals that the role of iron oxide in biological activity is good due to its biocompatibility, biodegradability, ease of synthesis and different magnetic behaviours.
Abstract: The iron oxide nanoparticles have a great attraction in biomedical applications due to their non-toxic role in the biological systems. The iron oxide nanoparticles have both magnetic behaviour and semiconductor property which lead to multifunctional biomedical applications. The iron oxide nanoparticles used in biomedical fields such as antibacterial, antifungal and anticancer were reviewed. The uses of hematite (α-Fe2O3), maghemite (γ-Fe2O3) and magnetite (Fe3O4) nanoparticles, for an inhibition time in biological activities, are listed in this work. Also, this review explains the use of iron oxide nanoparticles in the biomedical fields with particular attention to the application of hematite and superparamagnetic iron oxide nanoparticles. In this review, analysis reveals that the role of iron oxide in biological activity is good due to its biocompatibility, biodegradability, ease of synthesis and different magnetic behaviours. The change of properties of iron oxide nanoparticles such as particle size, morphology, surface, agglomeration and electronic properties has specific impact in biomedical application. The review mainly focused in and discussed about antibacterial, anticancer, bone marrow and cell labelling activities. From this review work, the iron oxide nanoparticle may be specialised in particular bacterial and cancer treatments. Also discussed are the iron oxide nanoparticle-specific biomedical applications like human placenta, insulin and retinal locus treatments.

122 citations


Journal ArticleDOI
TL;DR: In this paper, the processes of biogenic iron oxide nanoparticles (FeNPs) formation via green chemistry approach and analyzed their antibacterial activity was elaborated and analyzed in terms of their ability to resist Staphylococcus aureus and Pseudomonas fluorescens.
Abstract: The study elaborated the processes of biogenic iron oxide nanoparticle (FeNPs) formation via green chemistry approach and analyzed their antibacterial activity. The biosynthesized iron oxide nanoparticles (FeNPs) were characterized by UV-visible spectroscopy, FT-IR (Fourier transform infrared spectroscopy), X-ray Diffractometer (XRD), EDX (Energy dispersive X-ray spectroscopy) and SEM (Scanning electron microscopy). The synthesized nanoparticles were rod shaped. The antibacterial activity was determined for Eichhornia mediated iron oxide nanoparticles (FeNPs). The highest zone of inhibition was observed at 100 µg/ml concentration of Eichhornia mediated iron oxide nanoparticles against Staphylococcus aureus and Pseudomonas fluorescens. The iron oxide nanoparticles (FeNPs) showed good antibacterial activity and may be used in medicinal fields.

102 citations


Journal ArticleDOI
TL;DR: In this article, several bare iron oxide samples were investigated for catalytic hydrogenation of CO 2 to CH 4 and H 2 O under atmospheric pressure, and the fresh samples were thoroughly characterised by N 2 physisorption, X-ray diffraction, and Moessbauer spectroscopy.
Abstract: In this paper, several bare iron oxide samples were investigated for catalytic hydrogenation of CO 2 to CH 4 and H 2 O under atmospheric pressure. The fresh samples were thoroughly characterised by N 2 physisorption, X-ray diffraction (XRD) and Moessbauer spectroscopy. Hydrogenation studies were performed with a CO 2 fraction of 1000 ppm and a molar H 2 /CO 2 ratio of 200 to accurately monitor gas phase species providing reliable mass balance of carbon. The obtained results evidenced reduction of the iron oxides followed by significant accumulation of carbon. In situ XRD and temperature-programmed hydrogenation (TPH) demonstrated formation of iron carbide (θ-Fe 3 C) as well as carbonaceous deposits implying surface and bulk carbon entities. The quantity of each carbon species depended on the physical-chemical properties of the catalysts with fast carburisation of relatively large iron crystallites originated from iron oxide reduction. The best methanation activity was found for nano-sized γ-Fe 2 O 3 indicating maximum CH 4 yield of ca. 60% at 400 °C. TPH analyses suggested that the hydrogenation efficiency of this catalyst was mainly associated with reactive surface carbon species. Furthermore, for more practical assessment of γ-Fe 2 O 3 , CO 2 hydrogenation was conducted with a CO 2 proportion of 10 vol.% and stoichiometric H 2 /CO 2 ratio leading to decreased yield of CH 4 and predominate formation of CO. Based on XRD, TPH and Moessbauer spectroscopic analyses the catalytic activity under these conditions was ascribed to θ-Fe 3 C and χ-Fe 5 C 2 entities with some contribution of carbon species deposited on the catalyst.

94 citations


Journal ArticleDOI
TL;DR: The authors perform experiments on intermediate magmas and show that increasing aH2O and fO2 enlarges the two-liquid field thus allowing the Fe–Ca–P melt to separate easily from host silicic magma and produce iron oxide-apatite ores.
Abstract: The origin of iron oxide-apatite deposits is controversial. Silicate liquid immiscibility and separation of an iron-rich melt has been invoked, but Fe–Ca–P-rich and Si-poor melts similar in composition to the ore have never been observed in natural or synthetic magmatic systems. Here we report experiments on intermediate magmas that develop liquid immiscibility at 100 MPa, 1000–1040 °C, and oxygen fugacity conditions (fO2) of ∆FMQ = 0.5–3.3 (FMQ = fayalite-magnetite-quartz equilibrium). Some of the immiscible melts are highly enriched in iron and phosphorous ± calcium, and strongly depleted in silicon (<5 wt.% SiO2). These Si-poor melts are in equilibrium with a rhyolitic conjugate and are produced under oxidized conditions (~FMQ + 3.3), high water activity (aH2O ≥ 0.7), and in fluorine-bearing systems (1 wt.%). Our results show that increasing aH2O and fO2 enlarges the two-liquid field thus allowing the Fe–Ca–P melt to separate easily from host silicic magma and produce iron oxide-apatite ores. The origin of iron oxide-apatite deposits remains enigmatic and controversial. Here, the authors perform experiments on intermediate magmas and show that increasing aH2O and fO2 enlarges the two-liquid field thus allowing the Fe–Ca–P melt to separate easily from host silicic magma and produce iron oxide-apatite ores.

Journal ArticleDOI
TL;DR: In this paper, some amount of iron oxides are incorporated into titanium dioxide nanowires (Fe-TiOx LNWs/Ti) by ion substitution and followed calcination process.

Journal ArticleDOI
Yi He1, Debin Jiang1, De Yi Jiang1, Jie Chen1, Yuxin Zhang1 
TL;DR: The microstructure characterization results revealed that the Fe2O3 nanorods were uniformly distributed on the surface of diatomite, and a possible photo-catalytic mechanism was proposed to testify metal oxides composites for heterogeneous photo Fenton-like reaction.

Journal ArticleDOI
TL;DR: In this article, Fe-Mn binary oxides with different Fe/Mn molar ratios were synthesized to investigate the influence of the changed iron oxides forms and the manganese oxide on the removal efficacy of Sb(V) from water under neutral pH.

Journal ArticleDOI
TL;DR: The inner layer was identified by Transmission Electron Microscopy (TEM) as Fe3O4 (magnetite) and was always present over time despite it being less stable than iron sulfide as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, the authors present and identify the effects of different flotation conditions on removal of specific impurities in iron ore such as quartz, alumina, phosphorous, and sulfur.
Abstract: Recently, beneficiation of iron from low-grade ores with high impurities has been a matter of discussion. Flotation is one of the most effective technologies for the upgrading of low-grade, finely grained iron ores. This method can also be applied to reduce the impurities content in magnetite concentrates obtained using wet low- and high-intensity magnetic separations. In this paper, several studies describing the processing of iron ores via direct and reverse cationic and anionic flotation are reviewed. The objective of this review was to present and identify the effects of different flotation conditions on removal of specific impurities in iron ore such as quartz, alumina, phosphorous, and sulfur. Novel and common used collectors, depressants, auxiliary reagents, and their mixtures in the flotation are tabulated. This paper attempts to provide an explanation for the current state and use of iron ore flotation methods, as well as to present some ideas on future initiatives and potential developme...

Journal ArticleDOI
TL;DR: In this article, the nanoscale distribution and physicochemical states of biometals, particularly iron, were characterised in isolated amyloid plaque cores from human Alzheimer's disease cases using synchrotron X-ray spectromicroscopy.
Abstract: Altered metabolism of biometals in the brain is a key feature of Alzheimer's disease, and biometal interactions with amyloid-β are linked to amyloid plaque formation. Iron-rich aggregates, including evidence for the mixed-valence iron oxide magnetite, are associated with amyloid plaques. To test the hypothesis that increased chemical reduction of iron, as observed in vitro in the presence of aggregating amyloid-β, may occur at sites of amyloid plaque formation in the human brain, the nanoscale distribution and physicochemical states of biometals, particularly iron, were characterised in isolated amyloid plaque cores from human Alzheimer's disease cases using synchrotron X-ray spectromicroscopy. In situ X-ray magnetic circular dichroism revealed the presence of magnetite: a finding supported by ptychographic observation of an iron oxide crystal with the morphology of biogenic magnetite. The exceptional sensitivity and specificity of X-ray spectromicroscopy, combining chemical and magnetic probes, allowed enhanced differentiation of the iron oxides phases present. This facilitated the discovery and speciation of ferrous-rich phases and lower oxidation state phases resembling zero-valent iron as well as magnetite. Sequestered calcium was discovered in two distinct mineral forms suggesting a dynamic process of amyloid plaque calcification in vivo. The range of iron oxidation states present and the direct observation of biogenic magnetite provide unparalleled support for the hypothesis that chemical reduction of iron arises in conjunction with the formation of amyloid plaques. These new findings raise challenging questions about the relative impacts of amyloid-β aggregation, plaque formation, and disrupted metal homeostasis on the oxidative burden observed in Alzheimer's disease.

Journal ArticleDOI
TL;DR: In this paper, a unique core-shell nanostructured oxygen evolution reaction (OER) catalyst composed of an electrochemically inactive crystalline iron oxide core and an active amorphous nickel phosphide shell is presented, and this catalyst results in superior OER activity.
Abstract: A unique core–shell nanostructured oxygen evolution reaction (OER) catalyst composed of an electrochemically inactive crystalline iron oxide core and an active amorphous nickel phosphide shell is presented, and this catalyst results in superior OER activity. Even activators enhancing the activity of the OER catalyst by promoting the redox reactions are reported, but here the exclusive position of iron in the nanostructures indeed boosted the efficiency due to ideal placement. Moreover, these nanostructures are also prepared in a sophisticated mechanistic approach in which selectively one metal is phosphidated and the other is not. Interestingly, in the absence of iron, nickel phosphide crystallized in a different shape, but in the presence of iron, this specifically formed amorphous NixP became more efficient for promoting the OER. Details of the formation of this active catalyst are studied; the electrochemical reactions are investigated, and the OER activity is compared with that of different leading me...

Journal ArticleDOI
TL;DR: In this paper, a new approach for MFC application on a large scale based on low-cost and high-efficiency anodes for simultaneous power generation and wastewater treatment was presented.

Journal ArticleDOI
TL;DR: In this article, the structure evolution of iron active phases for CO2 hydrogenation over iron-based catalysts was analyzed using a combination of operando Raman spectroscopy and X-ray Diffraction coupled with online gas chromatography.
Abstract: Understanding of dynamic structure of active sites is of paramount importance for rational design of industrial catalysts. This work revealed the structure evolution of iron active phases for CO2 hydrogenation over iron‐based catalysts. With a combination of operando Raman spectroscopy and X‐ray Diffraction coupled with online gas chromatography, the panoramic structure evolution of iron oxides (α‐Fe2O3 and γ‐Fe2O3) during activation and CO2 hydrogenation were elaborated, that is, α‐Fe2O3 (γ‐Fe2O3)→α‐Fe3O4 (γ‐Fe3O4)→α‐Fe (γ‐Fe)→χ‐Fe5C2 (θ‐Fe3C). Both iron carbides showed high catalytic activities while χ‐Fe5C2 exhibited higher selectivity to lower olefins but weaker chain growth probability than θ‐Fe3C.

Journal ArticleDOI
TL;DR: Bovine serum albumin‐coated iron oxide nanoparticles with different sizes and their polyethylene glycol derivative are synthesized and it was shown that albumin nanoparticles’ coating provides a stable and biocompatible shell and prevents cytotoxicity of magnetite core.
Abstract: Toxicological research of novel nanomaterials is a major developmental step of their clinical approval. Since iron oxide magnetic nanoparticles have a great potential in cancer treatment and diagnostics, the investigation of their toxic properties is very topical. In this paper we synthesized bovine serum albumin-coated iron oxide nanoparticles with different sizes and their polyethylene glycol derivative. To prove high biocompatibility of obtained nanoparticles the number of in vitro toxicological tests on human fibroblasts and U251 glioblastoma cells was performed. It was shown that albumin nanoparticles' coating provides a stable and biocompatible shell and prevents cytotoxicity of magnetite core. On long exposure times (48 hours), cytotoxicity of iron oxide nanoparticles takes place due to free radical production, but this toxic effect may be neutralized by using polyethylene glycol modification.


Journal ArticleDOI
TL;DR: This article showed that Pd single atoms anchored on the surface of Fe3O4 are very active for the hydrogenation of CO2 to ethanol at 300°C, even at atmospheric pressure.
Abstract: The hydrogenation of CO2 into value‐added chemicals is one of the most investigated methods to reduce CO2 emissions in the atmosphere and thereby contributes to a sustainable chemical industry. Whereas the catalytic hydrogenation of CO2 into methanol and synthetic hydrocarbons is well established, the effective and selective transformation of CO2 into higher alcohols is still challenging. Here, we show that Pd single atoms anchored on the surface of Fe3O4 are very active for the hydrogenation of CO2 to ethanol at 300 °C, even at atmospheric pressure. By comparing various Pd/MOx catalysts, we conclude that the metal–oxide interface has a strong influence on catalytic behavior.

Journal ArticleDOI
TL;DR: In this paper, different commercial hematite powders, normally used as Fe precursor in laboratory synthesis of Fe-containing oxides, were characterized using X-ray diffractometry (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM).
Abstract: Magnetic techniques are suitable to detect iron oxides even in trace concentrations. However, since several iron oxides may be simultaneously present in natural and synthetic samples, mixtures of magnetic particles and magnetic interactions between grains can complicate magnetic signatures. Among the iron oxide minerals, hematite (α-Fe2O3) and magnetite (Fe3O4) are the most common. In this work, different commercial hematite powders, normally used as Fe precursor in laboratory synthesis of Fe-containing oxides, were characterized using X-ray diffractometry (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM). The effects of different concentrations of the hematite and magnetite on the magnetic properties of a set of mixtures (from 1 to 10 wt% magnetite) were then investigated by measuring the hysteresis loops, first order reversal curves (FORCs), thermal demagnetization, and isothermal remanent magnetization (IRM) curves. The three commercial hematite powders presented differ...

Journal ArticleDOI
01 Mar 2018-Fuel
TL;DR: In this article, the high-purity syngas production with a molar ratio of H2 to CO equal to 2 was achieved through a chemical looping process with a CH4-CO2 feed mixture on a ceria-enhanced mesoporous Fe2O3/Al 2O3 oxygen carrier.

Journal ArticleDOI
TL;DR: In this article, a one-pot fabrication platform was developed for the preparation of Dy 3+ -doped iron oxide nanoparticles (Dy-IONPs), which were electrodeposited from an additive-free aqueous mixed solution of iron(III) nitrate, iron(II) chloride and dysprosium chloride salts.

Journal ArticleDOI
TL;DR: This review explores the therapeutic activities of IMNP and their use as antimicrobial agents, which can be efficient for the treatment of microbial infections, probably acting as membrane permeability enhancer, damaging the cell wall or by generating reactive oxygen species.
Abstract: The use of iron oxide magnetic nanoparticles (IMNP) in medical and pharmaceutical areas dates to the beginning of the 1970s, as carriers. Some other uses to these nanoparticles are in vitro separat...

Journal ArticleDOI
TL;DR: In this article, the influence of polyacrylic acid (PAA) molecular weight and PAA concentration over the magnetic and structural properties of iron oxide nanoparticles has not been previously reported, and the main results showed that for a certain PAA reactor feed higher oligomer quantities are present in MNPs as higher is the involved molecular weight of the polymeric chain; when molecular weight raises the contribution of loops and tails also does it, allowing having higher polymer contents.

Journal ArticleDOI
TL;DR: In this paper, the authors presented the very first report on antibacterial properties of novel nanocomposites of iron oxide and cobalt oxide nanoparticles against pathogenic bacterial strains B. subtilis, S. aureus, E.coli and S. typhi.
Abstract: Owing to their multiple mechanisms of bactericidal activity, inorganic metal oxides and hybrid metal oxide nanocomposites may serve as a new class of effective disinfectants. Among metal oxide nanoparticles, iron oxide nanoparticles exhibit minimal or no cytotoxicity to human cells with very efficient bactericidal properties over a wide spectrum of bacteria. This paper presents the very first report on antibacterial properties of novel nanocomposites of iron oxide and cobalt oxide nanoparticles against pathogenic bacterial strains B. subtilis, S. aureus, E.coli and S. typhi. The enhanced bactericidal activity of the Fe/Co oxide nanocomposite was the result of synergistic effect of iron oxide and cobalt oxide nanoparticles. The nanocomposites were synthesized using co-precipitation route with increasing cobalt content in the sample and further characterized using XRD, TEM, Raman and VSM to investigate structural, optical and magnetic properties of the prepared nanocomposites, respectively. Also, the prepared nanocomposites were highly biocompatible and found non-toxic to human cell line MCF7.

Journal ArticleDOI
TL;DR: The investigation of the synthesis mechanisms confirmed the major role of chelating ligand and of the heating rate to drive the cubic shape of nanoparticles and showed that the nanoplate formation would depend mainly on the nucleation step and possibly on the presence of a given ratio of oleic acid and chelATING ligand (oleate and/or stearate).
Abstract: Iron oxide nanoparticles are widely used as a contrast agent in magnetic resonance imaging (MRI), and may be used as therapeutic agent for magnetic hyperthermia if they display in particular high magnetic anisotropy. Considering the effect of nanoparticles shape on anisotropy, a reproducible shape control of nanoparticles is a current synthesis challenge. By investigating reaction parameters, such as the iron precursor structure, its water content, but also the amount of the surfactant (sodium oleate) reported to control the shape, iron oxide nanoparticles with different shape and composition were obtained, in particular, iron oxide nanoplates. The effect of the surfactant coming from precursor was taking into account by using in house iron stearates bearing either two or three stearate chains and the negative effect of water on shape was confirmed by considering these precursors after their dehydration. Iron stearates with three chains in presence of a ratio sodium oleate/oleic acid 1:1 led mainly to nanocubes presenting a core-shell Fe1−xO@Fe3−xO4 composition. Nanocubes with straight faces were only obtained with dehydrated precursors. Meanwhile, iron stearates with two chains led preferentially to the formation of nanoplates with a ratio sodium oleate/oleic acid 4:1. The rarely reported flat shape of the plates was confirmed with 3D transmission electronic microscopy (TEM) tomography. The investigation of the synthesis mechanisms confirmed the major role of chelating ligand and of the heating rate to drive the cubic shape of nanoparticles and showed that the nanoplate formation would depend mainly on the nucleation step and possibly on the presence of a given ratio of oleic acid and chelating ligand (oleate and/or stearate).