Mesoporous iron oxide nanowires: synthesis, magnetic and photocatalytic properties

Gandha, Kinjal; Mohapatra, Jeotikanta; Hossain, Muhammad Shazzad; Elkins, Kevin; Poudyal, Narayan; Rajeshwar, Krishnan; Liu, J. Ping

doi:10.1039/c6ra18530d

Cited by 47 publications

(33 citation statements)

References 33 publications

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“…Recently, Fe 3 O 4 nanowires were synthesized via high-temperature reduction of α-FeOOH NWs in a fluidized bed reactor [111]. The removal of water molecules and the shearing of the oxide ion planes from AB to ABC stacking during phase transformation from the FeOOH to Fe 3 O 4 make these Fe 3 O 4 NWs porous (Figure 11A,B) [112].…”

Section: Enhancing Inductive Heating By Engineering the Magnetic Nmentioning

confidence: 99%

“…While the spherical-shape NPs shows the predictable superparamagnetic blocking behavior, which indicates the role of shape anisotropy on the stoichiometry. It is found that the facets of octahedral particles are consist of the most energetically stable [111] planes and the facets are protected against surface oxidation due to oleylamine coating. Thus, the surface anisotropy is significantly reduced, since the flat surface of the octahedron has fewer broken bonds and oxygen vacancies.…”

Section: Enhancing Inductive Heating By Engineering the Magnetic Nmentioning

confidence: 99%

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Inductive Thermal Effect of Ferrite Magnetic Nanoparticles

2019

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Localized heat induction using magnetic nanoparticles under an alternating magnetic field is an emerging technology applied in areas including, cancer treatment, thermally activated drug release and remote activation of cell functions. To enhance the induction heating efficiency of magnetic nanoparticles, the intrinsic and extrinsic magnetic parameters influencing the heating efficiency of magnetic nanoparticles should be effectively engineered. This review covers the recent progress in the optimization of magnetic properties of spinel ferrite nanoparticles for efficient heat induction. The key materials factors for efficient magnetic heating including size, shape, composition, inter/intra particle interactions are systematically discussed, from the growth mechanism, process control to chemical and magnetic properties manipulation.

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Section: Enhancing Inductive Heating By Engineering the Magnetic Nmentioning

confidence: 99%

Section: Enhancing Inductive Heating By Engineering the Magnetic Nmentioning

confidence: 99%

Inductive Thermal Effect of Ferrite Magnetic Nanoparticles

2019

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“…Note that a large surface area does not necessarily imply an improved catalytic performance, as accessibility and surface chemistry are also relevant for catalytic purposes. By extension, nanoarchitectonics have also attracted much attention for heterogeneous catalysis, as an increase in the number of active sites with high accessibility and overcoming the issue of size restriction was encountered with bulk samples (even if these samples are nanoporous) [16][17][18]. The improved catalytic performances are demonstrated in nanostructured catalysts.…”

Section: Introductionmentioning

confidence: 99%

Microemulsion-Based One-Step Electrochemical Fabrication of Mesoporous Catalysts

Serrà

Vallés

2018

Catalysts

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Electrochemical technology has been proposed as an alternative or complementary method to classical inorganic synthesis for the fabrication of effective metallic solid catalysts. Microemulsion-based electrodeposition is a novel, fast, and one-step procedure to obtain mesoporous catalysts with extraordinarily effective areas, which can be used in heterogeneous catalysis for degradation of pollutants and clean energy production. The fabrication process involves conducting microemulsions containing ionic species (dissolved in aqueous solutions) as precursors of the metallic catalysts. The presence of nanometric droplets of organic or ionic-liquid components in the microemulsion defines the mesoporosity of the catalysts during a one-step electrodeposition process. This method also allows the fabrication of metal catalysts as supported mesoporous films or mesoporous nanowires with very high effective areas. Additionally, reactants have excellent accessibility to the overall surface of the catalysts. The different catalysts fabricated with the help of this technology have been tested for competitive degradation of organic pollutants and anodes' materials for fuel cell devices.

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“…Nanocrystals with enhanced magnetic properties have been actively pursued for potential biomedical applications such as drug delivery [ 1 , 2 ], hyperthermia therapy [ 3 ], magnetic resonance imaging (MRI) contrast enhancement [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ], as well as nanotechnology applications such as catalysis and permanent magnets [ 13 , 14 ]. In order to use these nanoparticles for in vivo or in vitro biomedical applications such as MRI contrast enhancement, the combined properties of high magnetic saturation, stability, biocompatibility, and interactive functions at the surface are essentially required.…”

Section: Introductionmentioning

confidence: 99%

Fe Core–Carbon Shell Nanoparticles as Advanced MRI Contrast Enhancer

Chaudhary

Kangasniemi

Takahashi

et al. 2017

JFB

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The aim of this study is to fabricate a hybrid composite of iron (Fe) core–carbon (C) shell nanoparticles with enhanced magnetic properties for contrast enhancement in magnetic resonance imaging (MRI). These new classes of magnetic core–shell nanoparticles are synthesized using a one-step top–down approach through the electric plasma discharge generated in the cavitation field in organic solvents by an ultrasonic horn. Transmission electron microscopy (TEM) observations revealed the core–shell nanoparticles with 10–85 nm in diameter with excellent dispersibility in water without any agglomeration. TEM showed the structural confirmation of Fe nanoparticles with body centered cubic (bcc) crystal structure. Magnetic multi-functional hybrid composites of Fe core–C shell nanoparticles were then evaluated as negative MRI contrast agents, displaying remarkably high transverse relaxivity (r2) of 70 mM−1·S−1 at 7 T. This simple one-step synthesis procedure is highly versatile and produces desired nanoparticles with high efficacy as MRI contrast agents and potential utility in other biomedical applications.

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Mesoporous iron oxide nanowires: synthesis, magnetic and photocatalytic properties

Abstract: Controlled synthesis of mesoporous iron oxide nanowire nanohybrids with enhanced visible light-driven photocatalytic activity.

Cited by 47 publications

References 33 publications

Inductive Thermal Effect of Ferrite Magnetic Nanoparticles

Inductive Thermal Effect of Ferrite Magnetic Nanoparticles

Microemulsion-Based One-Step Electrochemical Fabrication of Mesoporous Catalysts

Fe Core–Carbon Shell Nanoparticles as Advanced MRI Contrast Enhancer

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