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Search for "spinel" in Full Text gives 42 result(s) in Beilstein Journal of Nanotechnology.

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

  • Rashmi Acharya,
  • Brundabana Naik and
  • Kulamani Parida

Beilstein J. Nanotechnol. 2018, 9, 1448–1470, doi:10.3762/bjnano.9.137

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  • photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability. Keywords: charge transfer; Cr(VI) reduction; heterojunction; modified TiO2; photocatalysis; spinel oxides; Review Introduction The increase in the global population demands rapid growth of industrialization and
  • visible light for reduction of Cr(VI) was exhibited by 2.0% Bi2O3/TiO2. A further increase in Bi2O3 dosage may create new recombination centers of photoinduced charge carriers, which in turn decreased the photocatalytic activity [178]. Photocatalytic reduction of Cr(VI) by TiO2 modified with spinel metal
  • oxides: Spinel types of metal oxides with the general formula AB2O4 (where A is a divalent metal ion and B is a trivalent metal ion) possess narrow band gaps which enable them to absorb throughout the visible region [179]. In addition, these materials have a high tendency for conduction of electrons
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Published 16 May 2018

Facile synthesis of ZnFe2O4 photocatalysts for decolourization of organic dyes under solar irradiation

  • Arjun Behera,
  • Debasmita Kandi,
  • Sanjit Manohar Majhi,
  • Satyabadi Martha and
  • Kulamani Parida

Beilstein J. Nanotechnol. 2018, 9, 436–446, doi:10.3762/bjnano.9.42

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  • great attention in the field of photocatalysis. The reasons are the absorption of a maximum fraction of solar light, and specific optoelectronic and magnetic properties [6][7][8][9]. Metal ferrites exhibit a spinel-like structure having the general formula of MFe2O4 (M = Zn, Cu, Ni, Mn, Co) and are
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Published 05 Feb 2018

Methionine-mediated synthesis of magnetic nanoparticles and functionalization with gold quantum dots for theranostic applications

  • Arūnas Jagminas,
  • Agnė Mikalauskaitė,
  • Vitalijus Karabanovas and
  • Jūrate Vaičiūnienė

Beilstein J. Nanotechnol. 2017, 8, 1734–1741, doi:10.3762/bjnano.8.174

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  • cobalt ferrite NPs with metionine molecules confers them strong non-fouling properties not allowing aggregate. The XRD pattern of these NPs (Figure 1c) implied the formation of pure, inverse spinel structure CoFe2O4, as all diffraction peaks at 2Θ positions: 18.29 (111), 30.08 (220), 35.44 (311), 43.06
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Published 22 Aug 2017

Vapor deposition routes to conformal polymer thin films

  • Priya Moni,
  • Ahmed Al-Obeidi and
  • Karen K. Gleason

Beilstein J. Nanotechnol. 2017, 8, 723–735, doi:10.3762/bjnano.8.76

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  • . Gleason and coworkers, having previously shown pV4D4 as potential solid electrolyte, are exploring the Si nanowire assembly in Figure 8a as a route toward anodes for micro lithium ion batteries [39]. Figure 9e shows a corresponding, conformal pV4D4 coating on a lithium spinel oxide particle, a material
  • -bead with conformal iCVD pHEMA coating, b) SEM image of commercial sponge with pHDFMA coating, c) SEM image of carbon nanotube forest with iCVD PTFE coating, d) TEM image of CNT bundle coated with MLD alucone coating, e) TEM image of lithium spinel oxide particle coated with iCVD pV4D4 coating, f) SEM
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Published 28 Mar 2017

Synthesis of graphene–transition metal oxide hybrid nanoparticles and their application in various fields

  • Arpita Jana,
  • Elke Scheer and
  • Sebastian Polarz

Beilstein J. Nanotechnol. 2017, 8, 688–714, doi:10.3762/bjnano.8.74

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Published 24 Mar 2017

A novel electrochemical nanobiosensor for the ultrasensitive and specific detection of femtomolar-level gastric cancer biomarker miRNA-106a

  • Maryam Daneshpour,
  • Kobra Omidfar and
  • Hossein Ghanbarian

Beilstein J. Nanotechnol. 2016, 7, 2023–2036, doi:10.3762/bjnano.7.193

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  • –magnetic particles confirms not only the crystallinity of the nanostructures but also the presence of gold in the synthesized nanocomposite. The XRD result shows six significant reflections of the (220), (311), (422), (511), (440), and (533) plane spacings of the magnetite phase with spinel structure
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Published 19 Dec 2016

Effect of nanostructured carbon coatings on the electrochemical performance of Li1.4Ni0.5Mn0.5O2+x-based cathode materials

  • Konstantin A. Kurilenko,
  • Oleg A. Shlyakhtin,
  • Oleg A. Brylev,
  • Dmitry I. Petukhov and
  • Alexey V. Garshev

Beilstein J. Nanotechnol. 2016, 7, 1960–1970, doi:10.3762/bjnano.7.187

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  • during cycling, the contact of Li1.4Ni0.5Mn0.5O2+x with electrolyte results in an interaction leading to the formation of a Li-deficient spinel Lix(Ni0.5Mn0.5)2O4, and, later, cubic (Ni0.5Mn0.5)O [37]. Other authors observed a slow transformation of the hexagonal phase into a cubic phase in the course of
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Published 09 Dec 2016

Antitumor magnetic hyperthermia induced by RGD-functionalized Fe3O4 nanoparticles, in an experimental model of colorectal liver metastases

  • Oihane K. Arriortua,
  • Eneko Garaio,
  • Borja Herrero de la Parte,
  • Maite Insausti,
  • Luis Lezama,
  • Fernando Plazaola,
  • Jose Angel García,
  • Jesús M. Aizpurua,
  • Maialen Sagartzazu,
  • Mireia Irazola,
  • Nestor Etxebarria,
  • Ignacio García-Alonso,
  • Alberto Saiz-López and
  • José Javier Echevarria-Uraga

Beilstein J. Nanotechnol. 2016, 7, 1532–1542, doi:10.3762/bjnano.7.147

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  • spinel structure (JCPDS file n19-629) (Supporting Information File 1, Figure S1). From the full width at half maximum (FWHM) of the (311) diffraction peak an average crystallite size of 18 nm for the Fe3O4@OA sample was calculated by Scherrer’s formula. The TEM images of the nanoparticles corroborate
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Published 28 Oct 2016

Microwave synthesis of high-quality and uniform 4 nm ZnFe2O4 nanocrystals for application in energy storage and nanomagnetics

  • Christian Suchomski,
  • Ben Breitung,
  • Ralf Witte,
  • Michael Knapp,
  • Sondes Bauer,
  • Tilo Baumbach,
  • Christian Reitz and
  • Torsten Brezesinski

Beilstein J. Nanotechnol. 2016, 7, 1350–1360, doi:10.3762/bjnano.7.126

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  • diffraction, 57Fe Mössbauer spectroscopy and X-ray photoelectron spectroscopy all show that the material is both chemically and phase-pure and adopts a partially inverted spinel structure with Fe3+ ions residing on tetrahedral and octahedral sites according to (Zn0.32Fe0.68)tet[Zn0.68Fe1.32]octO4±δ. Electron
  • good material characteristics, it is remarkable that the microwave-based synthetic route is simple, easily reproducible and scalable. Keywords: 1-phenylethanol route; lithium-ion battery; nanomagnetism; nanoparticles; nonaqueous sol–gel synthesis; zinc ferrite; Introduction Spinel ferrites of the
  • here [3][4][5][6][7][8]. The magnetic properties of spinel ferrites are known to be strongly dependent upon their size [9][10][11]. Part of the reason for this is that, for example, significant spin disorder occurs when the particle size is reduced to the nanometer level. Nevertheless, the cation site
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Published 27 Sep 2016

A facile method for the preparation of bifunctional Mn:ZnS/ZnS/Fe3O4 magnetic and fluorescent nanocrystals

  • Houcine Labiadh,
  • Tahar Ben Chaabane,
  • Romain Sibille,
  • Lavinia Balan and
  • Raphaël Schneider

Beilstein J. Nanotechnol. 2015, 6, 1743–1751, doi:10.3762/bjnano.6.178

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  • correspond to the magnetite Fe3O4 spinel-like structure (Figure 2f) [26][27]. Note that this sample was prepared using FeCl3 as a precursor in the presence of the MPA ligand, which probably also acts as a reducing agent to provide the necessary amount of Fe2+ to form magnetite. For the Mn:ZnS/ZnS and Mn:ZnS
  • notable discrepancy between the lattice parameters of the cubic zinc blende phase of the ZnS core material (a = 5.4093 Å) and the cubic spinel phase of the magnetite shell (a = 8.3970 Å) and (2) from the partial quenching of the Fe3O4 paramagnetic shell originating from the changes in the electronic
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Published 17 Aug 2015

Synthesis, characterization and in vitro biocompatibility study of Au/TMC/Fe3O4 nanocomposites as a promising, nontoxic system for biomedical applications

  • Hanieh Shirazi,
  • Maryam Daneshpour,
  • Soheila Kashanian and
  • Kobra Omidfar

Beilstein J. Nanotechnol. 2015, 6, 1677–1689, doi:10.3762/bjnano.6.170

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  • ° and 73.91° that correspond to the following Miller indices: (220), (311), (400), (422), (511), (440), and (533), indicating a spinel structure for Fe3O4 [38]. The average nanoparticle diameter was determined using the XRD data and the Debye–Scherrer equation, which were in agreement with the TEM
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Published 03 Aug 2015

The Kirkendall effect and nanoscience: hollow nanospheres and nanotubes

  • Abdel-Aziz El Mel,
  • Ryusuke Nakamura and
  • Carla Bittencourt

Beilstein J. Nanotechnol. 2015, 6, 1348–1361, doi:10.3762/bjnano.6.139

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  • diffusion of S was partially hindered, resulting in the formation of hemicylindrical CdS nanotubes instead of cylindrical ones. In 2006, Fan et al. [62] also showed that the Kirkendall effect can be used to synthesize monocrystalline spinel ZnAl2O4 nanotubes. In this case, the conversion method was based on
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Published 18 Jun 2015

Silica micro/nanospheres for theranostics: from bimodal MRI and fluorescent imaging probes to cancer therapy

  • Shanka Walia and
  • Amitabha Acharya

Beilstein J. Nanotechnol. 2015, 6, 546–558, doi:10.3762/bjnano.6.57

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  • fabricated NPs was 150 ± 10 nm as observed by TEM studies. The cubic spinel structure of Fe3O4 NPs was confirmed by XRD. The presence of the BDA linker was proved by observing SiO2/Fe3O4/BDA/Ln3+ complex by Raman spectroscopy which showed a prominent peak at 1306 cm−1 due to the stretching of carboxylate
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Published 24 Feb 2015

PEGylated versus non-PEGylated magnetic nanoparticles as camptothecin delivery system

  • Paula M. Castillo,
  • Mario de la Mata,
  • Maria F. Casula,
  • José A. Sánchez-Alcázar and
  • Ana P. Zaderenko

Beilstein J. Nanotechnol. 2014, 5, 1312–1319, doi:10.3762/bjnano.5.144

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  • Supporting Information File 1). As shown in Figure 2a, the USM nanoparticles are nearly spherical, with an average particle diameter of 14.0 nm and a standard deviation of 2.0 nm, and monocrystalline (Figure 2b). The electron diffraction pattern corresponds to the spinel iron oxide nanocrystalline phase
  • for USM nanoparticles to magnetite rather than to the isostructural spinel ferric iron oxide (maghemite), the XRD sample of the USM nanoparticles is consistent with the formation of magnetite. The peak broadening of the XRD pattern of the USM sample is in agreement with its nanocrystalline form. In
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Published 19 Aug 2014

Magnesium batteries: Current state of the art, issues and future perspectives

  • Rana Mohtadi and
  • Fuminori Mizuno

Beilstein J. Nanotechnol. 2014, 5, 1291–1311, doi:10.3762/bjnano.5.143

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Published 18 Aug 2014

A facile approach to nanoarchitectured three-dimensional graphene-based Li–Mn–O composite as high-power cathodes for Li-ion batteries

  • Wenyu Zhang,
  • Yi Zeng,
  • Chen Xu,
  • Ni Xiao,
  • Yiben Gao,
  • Lain-Jong Li,
  • Xiaodong Chen,
  • Huey Hoon Hng and
  • Qingyu Yan

Beilstein J. Nanotechnol. 2012, 3, 513–523, doi:10.3762/bjnano.3.59

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  • Lithium-ion batteries (LIBs) are considered the primary candidate as the power source for plug-in and hybrid electric vehicles [1]. Although LiCoO2 is widely used as a commercial cathode for Li-ion batteries, there are several drawbacks, including high cost and toxicity. Spinel Lithium Manganate (LMO) is
  • from the cubic to the tetragonal spinel phase during the charge/discharge cycling. This results in large distortion of the crystal structure and causes severe capacity loss. In order to solve these issues, many methods have been implemented. In general, these methods can be divided into two categories
  • sample after the lithiation and annealing process confirm the formation of the cubic spinel LiMn2O4 phase (JCPDS No. 35-0782). Here, the determination of the exact phase of the sample after the lithiation and annealing process is based on both the XRD analysis and inductively coupled plasma (ICP
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Published 17 Jul 2012

Noncontact atomic force microscopy study of the spinel MgAl2O4(111) surface

  • Morten K. Rasmussen,
  • Kristoffer Meinander,
  • Flemming Besenbacher and
  • Jeppe V. Lauritsen

Beilstein J. Nanotechnol. 2012, 3, 192–197, doi:10.3762/bjnano.3.21

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  • microscopy (NC-AFM) experiments we reveal a detailed structural model of the polar (111) surface of the insulating ternary metal oxide, MgAl2O4 (spinel). NC-AFM images reveal a 6√3×6√3R30° superstructure on the surface consisting of patches with the original oxygen-terminated MgAl2O4(111) surface interrupted
  • ); polar surfaces; reconstructions; spinel; Introduction While the application of metal oxides in, e.g., catalysis, gas sensors, fuel cells, high-k dielectrics and corrosion protection has seen a very strong development, fundamental research on the surface properties of metal oxides has been a topic of
  • the so-called spinel structure, which defines a larger group of ionic materials with the AB2X4 stoichiometry [5]. For spinel, the repeat units perpendicular to any low-index surface normal consist of layers with alternating charge (see e.g., Figure 1a), and the surface terminations are therefore
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Published 06 Mar 2012
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