About
64
Publications
16,911
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
994
Citations
Introduction
Current institution
Publications
Publications (64)
Natural-based and synthetic tissue adhesives have attracted extensive attention in the last two decades for their ability to stabilize uncontrolled bleeding instances. However; these materials present several drawbacks during use that scientists have tried to minimize in order to optimize their usage. This study comprises the development of a novel...
Our study is focused on optimizing the synthesis conditions for the in situ oxidation of Fe particles to produce Fe@Fe3O4 core–shell powder and preparation via co-precipitation of ZnFe2O4 nanoparticles to produce Fe@Fe3O4/ZnFe2O4 soft magnetic composites (SMC) through a hybrid cold-sintering/spark plasma-sintering technique. XRD and FTIR measuremen...
Our study is focused on the structural and morphological characteristics, optical behaviour and photocatalytic properties of undoped and 5 at% Eu3+-, Gd3+- and Y3+-doped CeO2 nanoparticles prepared by a green hybrid sol-gel combustion method. Several techniques such as X-ray diffraction powder (XRD), Transmission Electron Microscopy (TEM), UV-Vis s...
A Ga ³⁺ -substituted spinel magnetite nanoparticles (NPs) with the formula Ga 0.9 Fe 2.1 O 4 were synthesized using both the one-pot solvothermal decomposition method (TD) and the microwave-assisted heating method (MW). Stable colloidal solutions were obtained by using triethylene glycol, which served as a NPs stabilizer and as a reaction medium in...
Luminescent materials, or phosphors, are organic, inorganic, or hybrid organic/inorganic systems that convert certain types of energy into electromagnetic radiation over thermal radiation [...]
A Ga ³⁺ -substituted spinel magnetite nanoparticles (NPs) with the formula Ga 0.9 Fe 2.1 O 4 were synthesized using both the one-pot solvothermal decomposition method (TD) and the microwave-assisted heating method (MW). Stable colloidal solutions were obtained by using triethylene glycol, which served as a NPs stabilizer and as a reaction medium in...
Background
One-third of the world's population has anemia, contributing to higher morbidity and death and impaired neurological development. Conventional anemia treatment raises concerns about iron bioavailability and gastrointestinal (GI) adverse effects. This research aims to establish how iron oxide nanoparticles (IONPs) interact with probiotic...
Soft magnetic composites (SMCs) need a stable matrix to apply heat treatments for enhancing their magnetic characteristics. A stable matrix can be offered by alumina, but the densification of the ferromagnetic particles covered by this oxide (by sintering) can be very difficult. This paper proposes a feasible synthesis route for obtaining alumina m...
A new alloy, Supermalloy alloyed with aluminum, in powder form, has been obtained by mechanical alloying using elemental powders. An amount of 5 wt% of Al has been added to Supermalloy (Ni75Fe20Mo5) resulting a magnetic alloy (Al-Supermalloy) with the nominal chemical composition of Ni71·25Fe19Mo4·75Al5 wt.%. The powder obtained after 20 h of mecha...
italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Ab initio
calculations of voltage-controlled perpendicular magnetic anisotropy predict that the adjunction of Pt at the top of Co/MgO interface in Pt/Co/MgO ultrathin structures would enhance the perpendicular anisotropy and its electric field (
$E$
-...
In this study, the antibacterial activity of cerium oxide nanoparticles on two Gram-negative and three Gram-positive foodborne pathogens was investigated. CeO2 nanoparticles (CeO2 nps) were synthesized by a Wet Chemical Synthesis route, using the precipitation method and the Simultaneous Addition of reactants (WCS–SimAdd). The as-obtained precursor...
In this work we focus on enhancing the antibacterial activity of ZnO nanoparticles by Mn doping, synthesized using a wet-chemical method. The as-obtained precursor powders were deeply investigated by thermal analyses correlated with the evolved gas analysis (TG-DTA-FT-IR) and by in situ high-temperature XRD to elucidate the thermally induced proces...
This paper presents a new approach on the wet attrition of some composite WC-10Co powders by using an aqueous medium instead of the classical organic solvent based processing method. The hard metal powders have been characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), laser particle size analysis (PSA), Fourier transform in...
The paper presents the synthesis of CoFe2O4 nanocrystallites embedded in PVA-SiO2 hybrid matrix by a modified sol-gel method. The paper is focused on two aspects: (1) formation of cobalt and iron carboxylate-type precursors (oxalate, lactate, malonate and succinate) in the presence of tetraethylorthosilicate, polyvinylalcohol (PVA) and different di...
In this study, photocatalytic Fe3O4-TiO2: Gd berry-like pseudo-core-shell (BL-PCS) nanoparticles with various Gd doping content for wastewater treatment were prepared. Their characteristics were evaluated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy...
Fe3O4/Ni3Fe composite powder has been synthetized, starting from Fe, NiO and α-Fe2O3 precursors via mechanosynthesis and annealing, varying the alloy/ferrite ratio. The formation of Fe3O4 is noticed for the composite with low alloy content in the case of the samples milled for 10 hours. Formation of Ni3Fe and Fe3O4 does not fully occur after millin...
Lately, cerium oxide nanoparticles (CeO2-NPs, nanoceria) have gained a great interest for applications in diagnose and treatment of many diseases, including cancer. Herein, we have synthesized CeO2-NPs and performed in vitro studies on HeLa (human cervical cancer) and HFL-1 (normal human fetal lung fibroblast) cell lines. The nanosized CeO2-NPs, 6...
Succinate precursors dispersed in the silica matrix were obtained by sol-gel synthesis using Co and Fe nitrates, 1,4-butanediol and tetraethyl orthosilicate. The thermal decomposition of Co and Fe succinates into cobalt ferrite (CoFe2O4) at different CoFe2O4:SiO2 molar percentages was studied by thermal analysis, Fourier transformed infrared spectr...
This paper describes the synthesis and characterization of YBa2Cu3O7−x (YBCO) nanoparticles obtained through an environmentally friendly chemistry approach. Y-, Cu- acetates and Ba trifluoroacetate were used for the synthesis of the precursor gel. Moreover, sucrose and pectin reagents were added as chelating agents inducing the formation of small s...
Magnetization switching by current induced spin-orbit torques (SOTs) in heavy metal/ferromagnetic metal/oxide structures is of great research interest due to its potential applications in the field of low power consumption spintronic devices. Here, we study the Slonczewski-like and the field-like SOT effective fields in β-W/Co2FeAl/MgO structures s...
In this work, V-doped ZnO particles are synthesis via a simple, reproducible, controllable and direct wet chemical synthesis method. The structure, morphology, optical and luminescent properties of the Zn1−xVxO samples have been investigated by X-ray diffraction (XRD), Raman and UV–Vis spectroscopy, transmission electron microscopy (TEM) and photol...
Abstract: Ceria nanoparticles have been successfully synthesized using a new facile and eco-friendly sol-gel method. This approach is based on the thermal decomposition of ceric ammonium nitrate, Ce(NH4)2(NO3)6 in the presence of a sucrose,-pectin mixture. The chemical nature, structure and morphology of the CeO2 nanoparticles (nps) have been inves...
ZnO:Mn/ZnS nanocomposites were prepared by seed-mediated growth of ZnS QDs onto the preformed ZnO:Mn nanoparticles. The formation of the nanocomposite structure has been evidenced by XRD, HRTEM, and XPS. The architecture of the nanocomposite with outer ZnS QDs around ZnO:Mn cores is sustained by the sulfur and oxygen depth profiles resulted from XP...
We report on the synthesis and characterization of Eu3+-doped Y2O3 nanocrystalline particles prepared by the oxalate (co)-precipitation method. Based on thermogravimetric analyses coupled with mass spectrometry, and correlated with FT-IR analyses and X-ray diffraction (XRD) measurements performed on the Eu3+-doped Y2O3 oxalate-type precursor, a the...
The paper presents a simple, reproducible, controllable, and direct wet chemical synthesis method for Zn1−x
Eux
O nanoparticles. The full understanding of decomposition mechanism of the as-obtained oxalate precipitate was achieved based on the thermal analysis correlated with the evolved gas analysis and FTIR spectroscopy. The structure, morphology...
In this paper the thermal decomposition of strontium zirconate metal-organic precursor is investigated by thermal analyses coupled with quadrupole mass spectrometry, Fourier transform infrared spectroscopy and X-ray diffraction measurements. Based on these analyses the decomposition sequence of both individual, and final precursors has been propose...
Owing to their radical scavenging nanoparticles (CeO2-NPs) are currently used for various
applications, including drug delivery or alternative chemotherapy agents. In this paper, the cellular
uptake and cytotoxicity caused by small size CeO2-NPs (20-nm) on cultured human lung cancer cells
was evaluated. The MTT assay was used to assess cell viabili...
Cerium oxide nanoparticles (CeO2 nanoparticles) as nanomaterials have promising biomedical applications. In this paper, the cytotoxicity induced by CONPs human cervical tumor cells was investigated. Cerium oxide nanoparticles were synthesized using the precipitation method. The nanoparticles were found to inhibit the proliferation of HeLa human cer...
An emerging topic of our days is nanoscience and nanotechnology successfully applied in the food industry. Characteristics such as size, surface area and morphology can modify the basic properties and the chemical reactivity of the nanomaterials. The breakthrough of innovative materials, processes, and phenomena at the nanoscale, as well as the pro...
The environmentally friendly fluorine-free propionate chemical solution deposition route has been developed for the epitaxial growth of YBa2Cu3O7−x (YBCO) superconducting films. In the present work, metal acetates are used as reagents to prepare a YBCO fluorine-free precursor solution. In order to determine the thermal decomposition behavior, the p...
Due to the unique property of cerium to easily switch oxidation states between Ce3 + and Ce4 + , cerium oxide has gained a considerable interest in the field of biomedicine as potential antioxidant agent exerting neuroprotective effects, as well. This work reports on the solvothermal synthesis and characterization of ultrasmall (<10 nm) ceria nanop...
Cerium activated yttrium aluminate with garnet structure Y3Al5O12:Ce3+ is used as yellow emitting phosphor for the manufacturing of white light emitting diodes (WLEDs) generating “cold white” illumination. The luminescent emission of WLEDs can be either red, or blue tuned by the partial substitution of Y3+ with Gd3+ and/or Al3+ with B3+, respective...
Zn1−xCoxO (x=0.05, 0.10, 0.15) nanoparticles have been synthesized by an alternative wet-chemical synthesis route using the SimAdd technique. The as-obtained powders were investigated by FT-IR spectroscopy, X-ray diffraction and thermal analysis correlated with evolved gas analysis (TG–DTA–FT-IR) in order to determine their chemical nature, crystal...
Yttrium propionate, Y2(CH3CH2COO)6·xH2O, has been used as a precursor in the preparation of Y2O3 and YBa2Cu3O7-x thin films. The molecular structure of this precursor was determined by X-ray diffraction on single crystals, in good agreement with the formula calculated from the thermogravimetric analysis data. The molecular structure consists of a b...
a b s t r a c t ZnO nanoparticles were synthesized by the precipitation method, with and without tetraethylammonium hydroxide (TEAH) addition. FTIR analysis was performed for the characterization of ZnO precursors. The as-obtained ZnO nanoparticles were analyzed by X-ray diffraction (XRD) and scanning and transmission electron microscopies (SEM/TEM...
The deposition of undoped, aluminum and/or holmium doped and co-doped zinc oxide thin films on different substrates was achieved using a very simple and versatile aqueous solution method. The effect of the precursor solution concentration on the morphological and structural characteristics, as well as on the optical properties of the undoped ZnO th...
Undoped and holmium-doped ZnO thin films were obtained, using the sol-gel method. The films were characterized by scanning electron microscopy (SEM), Hall effect measurements, electron paramagnetic resonance (EPR) spectroscopy and superconducting quantum interference device vibrating sample magnetometry (SQUID-VSM). The Hall effect measurements hav...
This paper reports the influence of the temperature annealing (T-a) on the structural, morphological, Raman and EPR characteristics of Mn-doped ZnO nanoparticles. XRD studies reveal a wurzite-type structure, while the formation of ZnMnO3 secondary phase was evidenced only for the nanoparticles annealed at T-a = 700 degrees C. This impurity phase wa...
A new chemical solution deposition method for the growth of YTa0,85Nb0,15O4 (YTNO) thin films using trifuoroacetate-based metal precursors is presented. Using this method, YTNO thin films and YTNO island nanostructures were grown on (1 1 1) Si and (1 0 0) SrTiO3 (STO) single crystalline substrates, respectively. The nature of the trifluoroacetate p...
ZnO has been widely used in organic solar cells and hybrid solar cells due to its characteristics such as low cost
synthesis, non-toxicity, excellent chemical and thermal stability and specific electrical and optoelectronic properties.
The synthesis of undoped and aluminium and holmium doped and co-doped zinc oxide thin films on quartz, pyrex gla...
The thermal decomposition of zinc oxalate, obtained from the precipitation of zinc acetate with oxalic acid, with and without tetraethylammonium hydroxide (TEAH) addition, was investigated. The thermogravimetric analysis (TG) indicated a total mass loss of about 57% in two decomposition steps. FTIR-TG-DTA and MS-TG-DTA indicated mainly CO2 eliminat...
The blue light emission from yttrium niobiumtantalate Y(Ta, Nb)O4 phosphors under X-ray excitation, is associated with TaO43- and NbO43- groups from the host crystalline lattice. Such luminescent emission could be shifted toward longer wavelengths when activators: rare earth ions such Eu3+ or Tb3+ replace partially the yttrium ions in the host crys...
Yttrium tantalate-based phosphors are a class of efficient luminescent materials used in medical imaging applications. The paper presents the influence of activator concentration, firing regime and flux nature on the crystalline structure, morphology and luminescent characteristics of niobium activated yttrium tantalate powders. Phosphors samples w...
Low dimensional nanostructures of YTaO4:Nb thin films were deposited on Si (100) substrate using pulsed laser deposition (λ=193 nm) at room temperature. X-ray Diffraction, Scanning Electron Microscopy and Transmission Electron Microscopy analysis revealed the nanocrystalline nature of YTaO4:Nb film consisting of grains of 20–40 nm in size. The phot...
In order to prepare fine powders of red emitting Y2O3:Eu phosphors, the reagent simultaneous addition (SimAdd) technique was developed and the influence of some preparative conditions on morpho-structural and optical properties of phosphors was studied. There was revealed that the precipitating reagent type and the pH of the precipitation medium in...
International Conference of the Chemical Societies
of the South-East European Countries -
ICOSECS 5 (OHRID, Macedonia, Sept.2006)
Europium activated yttrium oxide phosphors were prepared by reagent simultaneous addition technique, using oxalic acid as precipitating reagent. The aim of the paper was to study the influence of the firing conditions on luminescent and morpho-structural properties of Y2O3:Eu phosphors. Thermal analysis, X-ray diffraction, SEM, FTIR and fluorescenc...
In order to prepare fine powders of red emitting Y2O3:Eu phosphors, the reagent simultaneous addition (SimAdd) technique was developed and the influence of some preparative conditions on morpho-structural and optical properties of phosphors was studied. There was revealed that the precipitating reagent type and the pH of the precipitation medium in...
In order to prepare fine powders of red emitting Y2O3:Eu phosphors, the reagent simultaneous addition (SimAdd) technique was developed and the influence of some preparative conditions on morpho-structural and optical properties of phosphors was studied. There was revealed that the precipitating reagent type and the pH of the precipitation medium in...
Terbium activated gadolinium oxysulphide phosphor (Gd 2 O 2 S:Tb) shows bright green luminescence and high efficiency under X-ray excitation. Phosphor utilisation depends on powder characteristics and luminescence properties that are regulated during the synthesis stage. The paper presents some of our new results on the synthesis of Gd 2 O 2 S:Tb p...
The paper presents some aspects referring to the synthesis of niobium activated yttrium orthotantalate phosphor (YTaO4:Nb), utilizable in the manufacture of X-ray intensifying screens for medical diagnosis. The influence of some preparative conditions such as activator concentration and firing regime on the crystalline structure and luminescent cha...
Terbium activated gadolinium oxysulphide phosphor (Gd2O2S: Tb) shows bright green luminescence and high efficiency under X-ray excitation. Phosphor utilization depends on powder characteristics and luminescent properties that are regulated during the synthesis stage. The paper prsents some of our results referring to the synthesis of Gd2O2S: Tb pho...
Rare earth activated phosphors are largely used in optoelectronic devices, X-ray intensifying screens and fluorescent lamps. Luminescent properties (color, efficiency, and decay parameters) and powder characteristics (particle morphology and size, crystalline structure) that are regulated during the synthesis process determine the phosphor utilizat...
