Izaskun Gil de Muro

Izaskun Gil de Muro
Universidad del País Vasco / Euskal Herriko Unibertsitatea | UPV/EHU · Inorganic Chemistry

About

73
Publications
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1,542
Citations
Citations since 2016
22 Research Items
792 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction

Publications

Publications (73)
Article
Full-text available
Nanosystems that simultaneously contain fluorescent and magnetic modules can offer decisive advantages in the development of new biomedical approaches. A biomaterial that enables multimodal imaging and contains highly efficient nanoheaters together with an intrinsic temperature sensor would become an archetypical theranostic agent. In this work, we...
Article
The achievement of a successful heating power response of Fe3O4 nanoparticles for being applied in magnetic hyperthermia entails an exhaustive control of their magnetic characteristics and therefore, of the synthesis method employed. Despite the fact that one of the best wet-chemical methods to finely adjust Fe3O4 nanoparticles (NPs) size over 15 n...
Article
The main objective of the preparation of the Fe3-xGaxO4 (0.14 ≤ x ≤ 1.35) system was to further the knowledge of the magnetic response of Ga3+-doped magnetite for application as MRI contrast agents. With this purpose, monodisperse nanoparticles between 7 and 10 nm with different amounts of gallium were prepared from an optimized protocol based on t...
Article
Full-text available
Recently, our collaborative work in the fabrication of a magnetorheological fluid (MRF) containing high magnetization FeCo nanoparticles (NPs, fabricated in our laboratories using the chemical reduction technique; MS = 212 Am2/kg) as magnetic fillers have resulted in a new MRF with superior performance up to 616.7 kA/m. The MRF had a yield stress v...
Article
We present results concerning the fabrication of a new magnetorheological fluid with FeCo magnetic nanoparticles (NPs) as magnetic fillers. These NPs have been fabricated by using the chemical reduction technique and show a pure crystalline phase with size ranging among 30–50 nm and high magnetization, 212 ± 2 A m² kg⁻¹. They agglomerate due to the...
Article
Full-text available
Local heat generation from magnetic nanoparticles (MNPs) exposed to alternating magnetic fields can revolutionize cancer treatment. However, the application of MNPs as anticancer therapy is limited by serious drawbacks. Foremost among these are the fast uptake and biodegradation of NPs by cancer cells and the unpredictable magnetic behavior of NPs...
Article
The coordination of photosensitizing dyes to zinc oxide nanoparticles (ZnO NPs) has attracted extensive attention as promising candidates for applications in solar cells. Here, we report the synthesis of ZnO NPs functionalized with geometric isomers of ruthenium(II)-polypyridyl complexes and a preliminary study of their photophysical properties by...
Article
We present results of the synthesis and characterization of Fe—Co—V high magnetization ferromagnetic nanoparticles (NPs) fabricated by two physical routes: laser ablation in liquid flow and mechanical ball milling. As characterizing techniques, we used dynamic light scattering, X-ray diffraction, transmission and scanning electron microscopy, and m...
Article
Manganese/iron ferrite nanoparticles with different Mn2+/3+ doping grades have been prepared by a thermal decomposition optimized approach so as to ascertain the doping effect in magnetic properties and, specially, in the magnetic hyperthermia response. The oxidation state and interstitial position of Mn in the spinel structure has shown to be crit...
Article
To improve the selectivity of magnetic nanoparticles for tumor treatment by hyperthermia, Fe3O4 nanoparticles have been functionalized with a peptide of the type arginine-glycine-aspartate (RGD) following a “click” chemistry approach. The RGD peptide was linked onto the previously coated nanoparticles in order to target αvβ3 integrin receptors over...
Article
Full-text available
With the aim of studying the influence of synthesis parameters in structural and magnetic properties of cobalt-doped magnetite nanoparticles, Fe3-xCo x O₄ (0 <x< 0.15) samples were synthetized by thermal decomposition method at different reaction times (30-120 min). The Co ferrite nanoparticles are monodisperse with diameters between 6 and 11 nm an...
Article
Full-text available
Nanoparticulate NiO and NiO/C composites with different carbon proportions have been prepared for anode application in lithium and sodium ion batteries. Structural characterization demonstrated the presence of metallic Ni in the composites. Morphological study revealed that the NiO and Ni nanoparticles were well dispersed in the matrix of amorphous...
Article
Full-text available
We present results concerning the synthesis, magnetic, dielectric and microwave absorption properties of BaFe12O19 / P(VDF-TrFE) nanocomposites. First, barium ferrite nanopowders were prepared by the hydrothermal synthesis method. Structural and morphological properties of the prepared powders were investigated by X-ray diffraction (XRD) and transm...
Article
An advanced cathode composite Na2.5Fe1.75(SO4)3/Ketjen/rGO for sodium ion batteries has been prepared, joining together the excellent electrochemical properties of the three components: off stoichiometric iron sulfate alluaudite, Ketjen Black carbon and reduced graphene oxide (rGO). This electrode material has been exhaustively characterized by XRD...
Article
The interplay between chemical inhomogeneities and magnetic properties in iron alloys is a subtle question that affects several nanoalloys with potential technological and biomedical applications. Herein below, we focus on the FCC palladium rich–iron nanoparticle system, specifically in three samples that reflect the key influence of synthesis cond...
Article
Highly monodispersed palladium nanoparticles have been synthesized by a two-phase reduction method using two different capping agents, alkylamines and alkanethiols. The influence of ligand type in the properties of palladium nanoparticles have been analyzed in detail by means of several techniques as Infrared and Ultraviolet-Visible Spectroscopy, X...
Article
ABSTRACT With the aim of improving the response in magnetic hyperthermia treatments and other biomedical applications, a nanoparticle system based on nickel ferrites has been investigated. Monodisperse ferrite nanoparticles with different proportions of Ni2+ ions and sizes have been produced by an optimized synthesis based on the thermal decomposit...
Conference Paper
TiO2 nanotubes have been synthesized using a 2-step strategy that involves the hydrothermal preparation of intermediate titanates followed by a subsequent thermal/hydrothermal treatment of these species to produce the desired oxide. In the first step the influence of parameters such as temperature, pH or reaction time on the composition, structure...
Article
LiMn0.8Fe0.1M0.1PO4/C (M: Fe, Co, Ni, Cu) nanocomposite cathode materials are prepared by freeze-drying of aqueous solutions of citric acid, Mn(OAc)3, LiOH, NH4H2PO4, and M(OAc)2 in stoichiometric quantities (-80 °C, 48 h, 3 x 10-1 mbar).
Article
Nanoparticulate Fe2O3 and Fe2O3/C composites with different carbon proportions have been prepared for anode application in lithium ion batteries (LIBs). Morphological studies revealed that particles of Fe2O3 in the composites were well-dispersed in the matrix of amorphous carbon. The properties of the γ-Fe2O3 nanoparticles and the correlation with...
Article
Palladium-rich Iron nanoparticles in the 4-8 nm range have been produced by a combination of two methods: the thermal decomposition of organometallic precursors and the reduction of metallic salts by a polyol. Herein, it is shown how the details of the synthesis have a striking impact on the magnetic and morphological properties of the final produc...
Article
Four LiMn0.8Fe0.1M0.1PO4/C (M = Fe, Co, Ni, Cu) cathode materials have been synthesized via a freeze-drying method. The samples have been characterized by powder X-ray diffraction, transmission electron microscopy, magnetic susceptibility, and electrochemical measurements. The composition and effective insertion of the transition-metal substituents...
Article
Full-text available
Highly monodispersed palladium nanoparticles have been synthesized by a two-phase reduction method using two different capping agents, alkylamines and alkanethiols. The influence of ligand type in the properties of palladium nanoparticles have been analyzed in detail by means of several techniques as Infrared and Ultraviolet-Visible Spectroscopy, X...
Article
Full-text available
Monodispersed Fe3O4 nanoparticles have been synthesized by a thermal decomposition method based on the seeded-growth technique, achieving size tunable nanoparticles with high crystallinity and high saturation magnetization. EMR spectroscopy becomes a very efficient complementary tool to determine the fine details of size distributions of MNPs and e...
Article
Full-text available
Hybrid nanoparticles are functionalized with delocalized covalent anions to form poly-salts for novel electrolytes for use in Li-ion or Na-ion batteries. These redox- and hydrolysis- stable electrolytes can avoid concentration gradients and still maintain the mechanical advantage of nanofillers with conductivities of around 10−5 S cm−1 at 25 °C.
Article
Different samples of the sodium–vanadium fluorophosphate cathodic materials have been synthesized via the hydrothermal method, varying the type and content of carbon used in the synthesis. Structural characterization of the composites was performed by powder X-ray diffraction. Magnetic susceptibility measurements and EPR (Electron Paramagnetic Reso...
Article
Three cathode compounds for lithium ion batteries, LiMn2O4, LiMn1.95Si0.05O4 and LiMn1.9Ga0.1O4 have been synthesized by the freeze-drying method. All samples present partially sintered particles of 80 nm average size, corresponding to single crystalline phases with cubic spinel structure. The substitution of a little portion of Mn(IV) by Si(IV) in...
Article
Full-text available
Magnetite nanoparticles have been synthesized at different temperatures in order to get nanoparticles of different average sizes. Powders of the synthesized nanoparticles were introduced in a radio frequency electromagnetic apparatus built to perform hyperthermia measurements in laboratory animals. The nanoparticles synthesized at 80 degrees C, the...
Article
The interaction of nanoparticles with cells has been a focus of interest during the past decade. We report the fabrication and characterization of hydrosoluble Fe₃O₄@Au nanoparticles functionalized with biocompatible and fluorescent molecules and their interaction with cell cultures by visualizing them with confocal microscopy. Gold covered iron ox...
Article
One of the most important challenges for further development of solid oxide fuel cells is to design new electrodes which operate at intermediate temperatures. In this sense, the formation of nanostructures of the Pr0.6Sr0.4Fe0.8Co0.2O3:Ce0.8Sm0.2O2 composite and their characterization have been carried out. These nanostructures have been synthesize...
Chapter
Full-text available
Oleic acid/oleylamine capped Fe1-xPdx (x=0.16, 0.20, 0.25) nanoparticles have been synthesized using a diol as reducing agent in order to get nanoparticles of different average sizes and coatings. Composition and morphology were analyzed by infrared spectroscopy (IR), X-Ray Diffraction (RXD), thermogravimetry (TG) and Transmission Electron Microsco...
Chapter
Magnetite based nanoparticles functionalized with different ligands have been obtained by optimization of two synthetic methods. Gold surrounded Fe3O4 nanoparticles capped with oleic acid and oleylamine were achieved by thermal decomposition of metallo-organic precursors. By this way nanoparticles with perfectly defined size within 3.5 nm to 7 nm i...
Article
One of the most important challenges for further development of solid oxide fuel cells is to develop new electrolytes which operate at intermediate temperatures. In this sense, the Ce0.8Pr0.2O2 material has been synthesized for the first time using polyol-mediated synthesis route, obtaining well crystallized nanoparticles with a particle size of 2–...
Article
Full-text available
Cobalt-free perovskite oxides Pr1−xCaxFe0.8Ni0.2O3 (PCFN) were investigated as novel cathodes for intermediate temperature solid oxide fuel cells (IT-SOFCs). Ca and Ni substitution in the PrFeO3 material shows that a wide range of perovskites Pr1−xCaxFe0.8Ni0.2O3 (0 < x < 0.9) can be prepared by sintering in air at 600 °C. Perovskites with 0 < x <...
Article
A powerful non-difficult and economical route based on the addition of carbon nanotubes (CNTs) is presented for the synthesis of nanostructured materials. For the first time, CNTs have been used as composite materials with a perovskite-type oxide for SOFC devices giving rise to an improved electrochemical behavior at intermediate temperatures.
Article
The creation of porous materials with three-dimensional periodicity has been identified as being of potential interest for increasing the overall performance of solid oxide fuel cells (SOFC). In this work, we have investigated the formation of pore systems in the nanometer scale by replicating colloidal templates. Templating methods have been used...
Article
One of the major challenges prior to a proper application of magnetic iron oxide nanocrystals is not only to understand the influence of the synthetic parameters on the final characteristics of the nanoparticles but also to optimize characterization methods in order to understand the magnetic behavior. First, a systematic study of the different par...
Article
The creation of nanostructured materials with three-dimensional periodicity has been identified as a potential interesting field for increasing the overall performance of solid oxide fuel cells (SOFCs). In this work, we have investigated the formation of Pr0.6Sr0.4Fe0.8Co0.2O3 nanotubes with different diameter sizes employing polymeric membranes as...
Article
Freeze-drying method was employed in order to synthesize a LiFePO4/C composite. This method produced phosphate nanoparticles (10-20 nm size) covered in a carbon network. Nanostructuring and homogeneous conductive web around the active material promoted a good electrochemical response, with 141 mAh.g(-1) at C/1 and a capacity retention of 90% up to...
Article
Two samples of commercial conducting carbon black and the carbon generated in situ during LiFePO4/C composite synthesis from citric acid are studied, with the aim of finding out whether carbon from the composite can fulfil the same function as carbon black in the electrode blend for a Li-ion battery. For this purpose, the carbon samples are analyze...
Article
Polycrystalline samples of La0.8Ca0.2Fe0.8Ni0.2O3−δ (LCFN) with perovskite type structure have been prepared by combustion, freeze drying, citrate-gel process and liquid mix method. The analysis of X-ray powder diffraction indicated that the samples were single phase and crystallized in an orthorhombic (space group, Pnma no. 62) structure.Transmiss...
Article
Full-text available
Dodecanethiol capped Ag nanoparticles (NPs) have been independently synthesized by the well-known Brust method under the same physical-chemical conditions. The obtained NP present similar sizes (∼2 nm ) but different magnetic behaviors. The extended x-ray absorption fine structure analyses at the K -edge of Ag did not reveal any noticeable structur...
Article
Different dodecanethiol capped Au nanoparticles (NP) with similar sizes (∼2 nm ) but different ferromagnetic signals at room temperature have been investigated by means of x-ray absorption spectroscopy at the Au L<sub>3</sub> -edge. The reversion of the x-ray magnetic circular dichroism signal with the change of sign of the external applied magneti...
Article
The influence of the carbon content in LiFePO(4)/C composites synthesized by the freeze-drying method was studied by varying the citric acid (chelating agent): Fe ratio. Diminishing this ratio from 1:1 to 0.33:1 led to a gradual reduction of the carbon content from 16.1 to 7.2% wt and different morphologies. Transmission electron microscopy microgr...
Article
In the present paper we report the magnetic characterization of silver-iron oxide nanocomposite obtained by the chemical microemulsion method. TEM images and X-ray diffractograms show that the nanocomposite consists of Ag nanoparticles of ∼ 7 nm surrounded by a quasiamorphous matrix. The ZFC–FC curves and Mössbauer spectra obtained at different tem...
Article
Monodisperse magnetite nanoparticles coated with organic ligands have been chemically synthesised by using the poliol method. Modifying the synthetic conditions, particle diameter can be tuned from 3.5 to 7.1nm. In order to investigate the critical size effects on the magnetic behavior of the samples, Fe3O4 nanoparticles have been fully characteriz...
Article
Ever since the first studies of magnetic Au nanoparticles (NPs) were published, few have been the element specific techniques or microscopic probes used to unequivocally determine the origin of their novel magnetic behavior. Here, we report muon spin relaxation (μSR) results of dodecanethiol capped Au NPs, showing the inherent signature of an order...
Article
Structural and magnetic properties of La0.7Pb0.3(Mn1–xNix)O3 (0.1 ≤ x ≤ 0.3) manganites are reported. Samples were fabricated by the sol–gel low-temperature method. At room temperature, the first structural characterization of all phases indicated the rhombohedral space group (Rc). All compositions show ferromagnetic behaviour and magnetoresistance...
Article
The freeze-drying method is proposed as an effective synthesis process for the obtaining of LiFePO4/C composites. The citric acid is used as a complexing agent and carbon source. After the low temperature annealing, the freeze-dried solution leads to a homogeneous carbon covered LiFePO4 sample. The chemical characterization of the material included...
Article
Structural and magnetic properties of La0.7Pb0.3(Mn1 – xCox)O3 (0.1 ≤ x ≤ 0.3) manganites are reported. Samples were fabricated by the sol-gel low temperature method. At room temperature, the first structural characterisation of all phases gave as a result the rhombohedral space group (Rc). All compositions show ferromagnetic behaviour and magnetor...
Article
The effect of Fe doping on the ferromagnetic Nd0.7Pb0.3Mn1-xFexO3 (x=0, 0.025, 0.05, 0.075, 0.1) phases has been studied in order to analyze the double-exchange interaction. The structural and magnetic study has been carried out by neutron powder diffraction and susceptibility measurements between 1.7 and 300 K. The substitution of Fe at the Mn sit...
Article
The BaFeO2.95 oxide has been obtained from thermal decomposition of the [BaFe(C3H2O4)2(H2O)4] metallo-organic precursor at 800°C under atmospheric oxygen pressure as small and homogeneous particles. From electronic paramagnetic resonance data, a metallic behavior in the 230–130K temperature range has been observed. Magnetic measurements confirm the...
Article
The CaMnO3−x (x=0 and 0.02) mixed oxide was synthesized from both thermal treatment of the [CaMn(C3H2O4)2(H2O)4] metallo-organic precursor and ceramic method. In the case of the latter method, temperatures of 1350°C and 50h were necessary; however, lower temperatures, 800°C, and shorter reaction times, 15h, were utilized in the attainment of the mi...
Article
The double perovskites, Sr2FeReO6 and Sr2FeRe0.9M0.1O6 (M=Nb, Ta) have been obtained by soft synthesis methods which yield homogeneous particles of micrometric grain size. The materials have been studied by X-ray and neutron powder diffraction, scanning electron microscopy and magnetic measurements. Rietveld refinements show that the compounds adop...
Article
Metallo-organic complexes with the formula [BaMn1−xMx(C3H2O4)2(H2O)4], where M =Fe, Co or Cu (0⩽x⩽1), were synthesised and characterised. All of them are isostructural and crystallise in the space group Pccn. The crystal structure has been described as a two-dimensional (2D) arrangement of M–malonate layers extended along the (010) crystallographic...
Article
Complexes with formula [BaM(C3H2O4)2(H2O)4], where M = Fe or Co, were synthesised and characterised. These two types of complexes are isostructural and crystallise in the Pccn space group. Their structure consists of two-dimensional networks of octahedral MO6 polyhedra in which the transition metal ions are coordinated by bridging malonate ligands,...
Article
The [CaM(mal)2(H2O)4] (M = Mn, Fe or Co; mal = C3H2O4) and [CaNi(mal)2(H2O)4]·2H2O compounds have been synthesized and characterized. X-Ray single crystal diffraction analysis was carried out on the [CaMn(C3H2O4)2(H2O)4] and [CaNi(C3H2O4)2(H2O)4]·2H2O complexes. The [CaM(C3H2O4)2(H2O)4] (M = Fe or Co) compounds are considered to be isostructural to...
Article
The [SrM(C3H2O4)(2)(H2O)(7)] (M=Mn, Fe, Co, Ni) compounds have been prepared and characterised by chemical analysis and X-ray diffraction. The crystal structure of [SrCo(C3H2O4)(2)(H2O)(5)]. 2 H2O has been solved [monoclinic, P2(1)/c, Z = 4, a = 6.880(1), b = 14.360(2), c = 15.800(2) Angstrom. beta = 101.69(1)degrees]. The compound exhibits a three...
Article
The [SrM(C3H2O4)2(H2O)7] (M = Mn, Fe, Co, Ni) compounds have been prepared and characterised by chemical analysis and X-ray diffraction. The crystal structure of [SrCo(C3H2O4)2(H2O)5] · 2 H2O has been solved [monoclinic, P21/c, Z = 4, a = 6.880(1), b = 14.360(2), c = 15.800(2) Å. β = 101.69(1)°]. The compound exhibits a three-dimensional chain/snak...
Article
Compounds with the general formula [MM‘(C3H2O4)2(H2O)4] (M = Ba, Sr; M‘ = Cu, Mn; C3H2O4 = malonate) have been synthesized and characterized. Single-crystal X-ray diffraction study on the [SrCu(C3H2O4)2(H2O)4] compound indicates that it crystallizes in the orthorhombic space group, Pccn, Z = 4, with unit cell parameters a = 6.719(2), b = 18.513(7),...
Article
Three new compounds with the general formula [MCu(C3H2O4)2(H2O)n] (M is Ca (n = 3), Sr and Ba (n = 4)) have been synthesized and characterized by analytical and infrared techniques. X-ray diffraction methods have shown that all the complexes have orthorhombic unit cells. Thermal decomposition of these compounds using TGA-DSC and DTA techniques invo...
Article
A study of the evolution of the magnetic and spectroscopic properties of BaCuOa+x, obtained by thermal decomposition of BaCu(edta).nHaO (edta = ethylenediaminetetraacetate), has been performed. The ferromagnetic behaviour of this compound is maintained with time, but a decrease in the effective magnetic number has been observed, probably due to the...
Article
The compound [Ni(N-3)(2)(bipy)(2)].H2O (I) (bipy=2,2'-bipyridine) has been sunthesized and its structure determined at room temperature. The coordination polyhedron of the Ni atom shows an octahedral topology with the two bipy and the two azido ligands in a cis arrangement. Two monomeric units form an outer-sphere dimer through hydrogen bonding wit...
Article
Full-text available
Platinum group metals (PGMs) which are widely used in car catalytic converters have been in high demand, in spite of a low natural abundance in the earth crust. Due to scarcity and high value of these metals, there is an increased interest towards their recovery from wastes such as spent catalyst. Palladium togheter with platinum is the metal more...
Article
Full-text available
Nanosized magnetic particles have attracted much interest in recent years due to their promising technological applications such as high-density magnetic storage media, microelectronics, ferrofluids or drug delivery sistems. These applications require a nanometer-scale control of the material, in terms of size, shape, composition and crystal struct...

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