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Publications (246)
With the wide use of nanomaterials in our daily life, the potential ecotoxicology effect of nanoparticles (NPs) has attracted more and more attention from researchers. Here, the ZnS:Mn (0.5%, 2.0%, 4.0% and 10% of Mn, in mol) QDs were synthesized using the polyol method, and the toxicity mechanism was investigated by contacting the microalgae Chlor...
Temperature- and humidity-sensing properties were evaluated of NixMg1-x spinel ferrites (0 ≤ x ≤ 1) synthesized by a sol-gel combustion method using citric acid as fuel and nitrate ions as oxidizing agents. After the exothermic reaction, amorphous powders were calcined at 700 °C followed by characterization with XRD, FTIR, XPS, EDS and Raman spectr...
The conversion processes of sugarcane into direct-consumption sugar and juice are generating a tremendous amount of waste, the so-called sugarcane bagasse (SCB). Biochar preparation is among the practical solutions aiming to manage and valorize SCB into high added-value functional material (FM).
Herein, we propose a novel zero-waste pathway to fabr...
Cobalt ferrite nanoparticles (CFNPs) have been synthesized using a one-pot-polyol method in the presence of different organic mediums as refluxing solvents. The synthesized CFNPs stability, magnetic property, particle size, and structural variations were characterized using high resolution transmission electron microscopy, X-ray diffraction, Brunau...
The aim of the present work is to valorise the brewing industry’s waste, i.e., brewer’s spent grain (BSG), into functional biocarbon for environmental catalysis applications. In this context, cost-effective and environmentally friendly biochar support coated with in-situ-generated Ag-Cu nanocrystals, was developed via the wet impregnation of BSG bi...
Maghemite (γ-Fe2O3) nanoparticles (MNPs) were functionalized with 3-aminopropyltriethoxysilane (APTES) to give APTES@Fe2O3 (AMNP) which was then reacted with diethylenetriamine-pentaacetic acid (DTPA) to give a nanohybrid DTPA-APTES@Fe2O3 (DAMNP). Nano-isothermal titration calorimetry shows that DTPA complexation with uranyl ions in water is exothe...
There is an ever‐growing demand for biochar production and its chemical transformation into specialty materials. Herein, we suggest a versatile method to elaborate Ag/Cu nanoparticles, by phytochemical process, on aryl‐sulfonated sugarcane bagasse pulp‐derived biochar. A binary nanocomposite has been fabricated through a four‐step strategy. The raw...
The present work is based on the principle of biomass waste valorization. Brewer’s spent grains (BSG) come from breweries as by-products. Their huge amount of production on an industrial scale should focus our attention on their valorization, which creates challenges as well as opportunities. One way to valorize BSG by-products is to convert them i...
Among the photocatalysts which could be used for converting solar energy, polyoxometalates are often regarded as ideal candidates because of their remarkable performances in photocatalytic water splitting and photodegradation of pollutants. Nonetheless, these polyanions are only capable of absorbing UV light, unless coupled to a visible-light photo...
Agrowaste-derived materials for the supporting of nanocatalysts is attracting a great attention due to the abundance and the physicochemical features they provide as bio-sourced underlying materials. The main idea is built around the conversion of junk material into functional material, a journey of waste from "trash to treasure". Herein, we sugges...
Valorization of agro-wastes into high performance functional materials is a topic that is receiving growing interest. Agro-wastes could be converted into biochar by slow pyrolysis and could be even given high added value by in situ deposition of nanoparticles. Herein, we investigate for the first time the impregnation of copper and nickel nitrates...
The conversion processes of sugarcane into direct-consumption sugar and juice are generating a tremendous amount of waste, the so-called sugarcane bagasse. Biochar preparation is among the practical solutions aiming to valorize this agrowaste and make it of a high added value functional material (FM). Herein, we propose a novel zero-waste pathway w...
Immobilization of nanocatalysts on biochar is receiving unprecedented interest among material and catalysis scientists due to its simplicity, versatility, and high efficiency. Herein, we propose a new direct approach to obtain bimetallic copper/nickel nanoparticles loaded on olive stone biochar. The bimetallic-coated biochar and the reference mater...
Biochar is a carbon allotrope obtained by pyrolysis of biomass, usually agro-waste. Owing to the demand for sustainable development, biochar is continuously raising much hope in the scientific community. However, in order to impart it with new properties, its modification is required, either in situ during pyrolysis, or after the carbonization proc...
By exploiting the configuration of an alternate-current thin-film electroluminescent device, we observe the emission of light from a close-packed spin-cast layer of manganese-doped zinc sulfide nanoparticles (NPs), sandwiched between two dielectric layers, induced by the application of an AC voltage. By means of a microwave-assisted polyol synthesi...
Iron doped zinc sulfide (Fe:ZnS) thin films are synthesized by chemical bath deposition (CBD). Fe dopant concentrations are 0, 6, 12 and 18 at.-%. Chemical study is monitored by X-ray fluorescence (XRF) spectroscopy to determine the exact composition. According to the XRF analysis, we found stoichiometric composition for the undoped film. Neverthel...
Carbon dots (CDs) are carbon-based nanoparticles (NPs) displaying remarkable light-harvesting properties. In this work, we have investigated for the first time the possibility to use CDs to photosensitize polyoxometalates (POMs). For this purpose, we have thus engineered positively charged carbon dots allowing electrostatic interactions with anioni...
We report the effect of a polyol-mediated annealing on nickel ferrite nanoparticles. By combining X-ray fluorescence spectroscopy, X-ray diffraction, and 57Fe Mössbauer spectrometry, we showed that whereas the as-prepared nanoparticles (NFO) are stoichiometric, the annealed ones (a-NFO) are not, since Ni0-based crystals precipitate. Nickel depletio...
In this study, polyol-made CdS and CdSe crystalline nanoparticles (NPs) are loaded by impregnation on TiO2 nanotube arrays (TNTAs) for solar-simulated light-driven photoelectrochemical (PEC) water vapor splitting. For the first time, we introduce a safe way to utilize toxic, yet efficient photocatalysts by integration in solid-state PEC (SSPEC) cel...
Developing micro- and nanomaterials for environmental pollution remediation is currently a pertinent topic. Among the plethora of strategies, designing supported nanocatalysts for the degradation of pollutants has achieved prominence. In this context, we are addressing one of the UN Sustainable Development Goals by valorizing agrowaste as a source...
Zinc sulfide (ZnS) thin films are prepared by chemical bath deposition (CBD) method on glass substrates. The effect of molybdenum (Mo) doping concentration on chemical composition, structural, morphological, optical and luminescence properties of zinc sulfide thin films is investigated. Chemical composition study by X-ray fluorescence (XRF) confirm...
Zinc sulfide (ZnS) films elaborated by chemical bath deposition (CBD) technique on glass substrates are irradiated with different doses of gamma rays ranged from 10 kGy to 100 kGy in air at room temperature by using ⁶⁰Co as a source. The structural analysis confirms cubic structure for non-irradiated and irradiated films. Moreover, structural prope...
Nickel doped zinc sulfide (Ni:ZnS) thin films are deposited on glass substrates by chemical bath deposition (CBD) for different Ni concentrations (0, 6, 12 and 18 at.-%). X-ray diffraction (XRD) patterns of undoped and Ni doped layers show a cubic structure with (111) preferred orientation. For the highest Ni concentration an impurity phase is dete...
Developing micro- and nanomaterials for environmental pollution remediation is hot topic presently. Among the plethora of strategies, designing supported nanocatalysts for the degradation of pollutants witnessed constant renewal. In this context, we are addressing one of the UN Sustainable Development Goals by valorizing agrowaste as a source of bi...
Developing micro- and nanomaterials for environmental pollution remediation is hot topic presently. Among the plethora of strategies, designing supported nanocatalysts for the degradation of pollutants witnessed constant renewal. In this context, we are addressing one of the UN Sustainable Development Goals by valorizing agrowaste as a source of bi...
Developing micro-and nanomaterials for environmental pollution remediation is hot topic presently. Among the plethora of strategies, designing supported nanocatalysts for the degradation of pollutants witnessed constant renewal. In this context, we are addressing one of the UN Sustainable Development Goals by valorizing agrowaste as a source of bio...
The formation of silver nanopetal-Fe3O4 poly-nanocrystals assemblies and the use of the resulting hetero-nanostructures as active substrates for Surface Enhanced Raman Spectroscopy (SERS) application are here reported. In practice, about 180 nm sized polyol-made Fe3O4 spheres, constituted by 10 nm sized crystals, were functionalized by (3-aminoprop...
Olive pit powder particles were impregnated with copper and nickel nitrates and pyrolyzed at 400 °C. The resulting material consists of bimetallic CuNi-decorated biochar. CuNi nanocatalysts were found to be as small as 10 nm and very well dispersed over biochar. XRD results evidenced zero valent copper and nickel and formation of copper-nickel soli...
Tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) is a member of the TNF cytokine superfamily. TRAIL is able to induce apoptosis through engagement of its death receptors DR4 and DR5 in a wide variety of tumor cells while sparing vital normal cells. This makes it a promising agent for cancer therapy. Here, we present two differe...
Current biomedical imaging techniques are crucial for the diagnosis of various diseases. Each imaging technique uses specific probes that, although each one has its own merits, do not encompass all the functionalities required for comprehensive imaging (sensitivity, non-invasive-ness, etc.). Bimodal imaging methods are therefore rapidly becoming an...
CrystallineMn3O4nanoparticles were prepared by olive leaf extract (OLE)-mediated wet chemistry under mild conditions. These nanoparticles are used as supported active material on a carbon working electrode in a set of room-temperature charge/discharge assays that allowed evidencing a clear pseudo-capacitance behavior with a high specific capacitanc...
Monodispersed CoO crystals about 5 nm in size were prepared by forced hydrolysis of cobalt(II) acetate in diethyleneglycol (DEG). The adsorption of solvent molecules on these primary nanocrystals causes in-situ oriented aggregation resulting in the precipitation of textured submicrometer-sized polycrystals. X-Ray Diffraction, Infrared Spectroscopy,...
Co: ZnS (0, 6, 12 and 18 at. -%) nanostructures are mounted on glass substrates by chemical bath deposition (CBD) technique. X-ray diffraction (XRD) analysis shows cubic structure. Compositional study using X-ray photoelectron spectroscopy (XPS) establishes chemical states of Zn²⁺, S²⁻, Co²⁺ and some impurity elements such as C and O. Morphological...
The term “polyol process” was first used in the late eighties by Fiévet, Lagier, and Figlarz [...]
Hetero-nanostructures with improved photoelectrochemical properties were assembled by impregnating well-crystallized CdSe quantum-dots onto TiO2 nanofibers on a Ti substrate. A significant enhancement of the photocurrent density was observed for the resulting CdSe-TiO2/Ti photoanode in a photoelectrochemical cell under solar simulated illumination:...
Using solar radiation to fuel catalytic processes is often regarded as the solution to our energy needs. However, developing effective photocatalysts active under visible light has proven to be difficult, often due to toxicity, instability, and high cost of suitable catalysts. We engineered a novel photoactive nanomaterial obtained by the spontaneo...
The authors wish to make the following corrections to this paper [1]: there are two mistakes inthis article [1] [...]
Conventional methods for sintering magnetic biased granular solids are generally known to induce severe grain growth and coarsening, thus making any evidence of exchange bias (EB) hard to detect in the resulting consolidates. This work explores the possibility of preparing a hetero-nanoconsolidate starting from an exchange-biased nanopowder and usi...
A methodology of surface chemical functionalization of equimolar HfNbTaTiZr high-entropy alloy (HEA) is presented herein. The aim is to improve the biocompatibility of this material for its application as bio-implants. X-ray Photoelectron Spectroscopy (XPS) showed that air or aqueous oxidation of HfNbTaTiZr induced the formation at its surface of u...
This study investigated the steady shear flow and viscoelastic properties of composite materials elaborated by introduction of positively charged polyol-made maghemite nanoparticles (NPs) in aqueous solutions of negatively charged sodium alginate polymers. Two different ligands were covalently attached to the particle surface, the 3-aminopropyl tri...
Red luminescent and superparamagnetic β-NaY0.8Eu0.2F4@γ-Fe2O3 nanoparticles, made of a 70 nm-sized β-NaY0.8Eu0.2F4 single crystal core decorated by a 10 nm-thick polycrystalline and discontinuous γ-Fe2O3 shell, have been synthesized by the polyol process. Functionalized with citrate ligands they show a good colloidal stability in water making them...
Fe-glycolate wires with micrometer-scale lengths can be synthesized by the polyol process. Although the as-produced wires are in the paramagnetic state at room temperature, they are transformed into ferrimagnetic iron oxides and ferromagnetic metallic iron wires by reductive annealing. The shape of the wires is unchanged by reductive annealing, and...
In this work, the preparation of magneto-plasmonic granular nanostructures and their evaluation as efficient substrates for magnetically assisted surface enhanced Raman spectroscopy (SERS) sensing are discussed. These nanostructures consist of star-shaped gold Au shell grown on iron oxide Fe3-xO4 multicores. They were prepared by seed-mediated grow...
An alternative route for metal hydrogenation has been investigated: cold plasma hydrogen implantation on polyol-made transition metal nanoparticles. This treatment applied to a challenging system, Ni–H, induces a re-ordering of the metal lattice, and superstructure lines have been observed by both Bragg–Brentano and grazing incidence X-ray diffract...
Hetero-nanostructures based on magnetic contrast oxides have been prepared as highly dense nanoconsolidates. Cobalt ferrite-cobalt oxide core-shell type nanoparticles (NPs) were synthesized by seed mediated growth in polyol and subsequently consolidated by Spark Plasma Sintering (SPS) at 500 °C for a few minutes while applying a uniaxial pressure o...
A common challenge in nanotechnology is the conception of materials with well-defined nanoscale structure. In recent years, virus capsids have been used as templates to create a network to organize 3D nano-objects, building thus new functional nanomaterials and then devices. In this work, we synthetized 3D gold nanoclusters and we used them as Surf...
Magnetic materials are crucial for the efficiency of the conversion-storage-transport-reconversion energy chain, and the enhancement of their performance has an important impact on technological development. The present work explores the possibility of preparing hetero-nano-structured ceramics based on magnetic oxides, by coupling a ferrimagnetic p...
Tin sulfide (SnS) thin films were obtained by chemical bath deposition (CBD) using two surfactants: anionic sodium dodecylsulfate (SDS) and cationic benzethonium chloride (BZC). The structural, morphological, chemical composition and optical properties of thin films were analyzed by using XRD, MEB, EDX, and spectrophotometer. The degradation effici...
Targeting TRAIL (Tumor necrosis factor (TNF)-Related Apoptosis-Inducing Ligand) receptors for cancer therapy remains challenging due to tumor cell resistance and poor preparations of TRAIL or its derivatives. Herein, to optimize its therapeutic use, TRAIL was grafted onto iron oxide nanoclusters (NCs) with the aim of increasing its pro-apoptotic po...
In this paper, Mo/Cu(In,Ga)Se2/ZnS/iZnO/dZnO solar cell is simulated and optimized by studying the effect of layers thickness on solar cell efficiency using Silvaco ATLAS software. The input simulation parameters are: dielectric permittivity \(\left(\upvarepsilon \right)\), band gap energy \(\left( {E_{g} } \right)\), electron affinity \(\left(\upc...
Background: In extrinsically magnetoelectric materials made of two components, the direct magnetoelectric coupling arises from a mechanical strain transmission at the interface due to the shape change of the magnetostrictive component under an external magnetic field. Here, the size of the interface between the two components plays a crucial role....
Environmental pollution caused by heavy metals constitutes a serious public health problem. In the case of uranium depletion, amidoxime groups are important because of their high affinity for uranium(VI). New series of bis(amidoxime)s with catechol-derived anchor groups were tested (b-AMD-1and b-AMD-2). The catechol groups were designed to bind to...
Tumor necrosis factor‐related apoptosis‐inducing ligand (TRAIL) has been considered as a potential anticancer agent owing to its selectivity for malignant cells. However, its clinical use remains limited because of its poor efficacy. Attempts to increase its antitumor activity include, among others, its functionalization by nanoparticles (NPs). In...
Wide band-gap semiconductor TiO 2 is an efficient anode material for photo-electrocatalytical (PEC) applications. Its light-sensitivity is limited to the UV but can be extended to the visible by chemical doping or chromophore sensitization. Moreover, its conductivity can be enhanced by coupling with carbon materials, which should limit back electro...
The structural, microstructural, and magnetic properties of ~5‐nm‐sized Co0.6Zn0.4Fe2 − xGdxO4 nanoparticles were investigated in order to evaluate their capability to enhance the magnetic resonance imaging contrast as high magnetization agents. A focus was made on the solubility of Gd3+ cations within the spinel lattice. By coupling X‐ray diffract...
The structural, microstructural, and magnetic properties of ~5‐nm‐sized Co0.6Zn0.4Fe2 − xGdxO4 nanoparticles were investigated in order to evaluate their capability to enhance the magnetic resonance imaging contrast as high magnetization agents. A focus was made on the solubility of Gd3+ cations within the spinel lattice. By coupling X‐ray diffract...
Antiferromagnetic (AF) CoO pseudo‐single crystals 125 ± 20 nm in diameter were prepared by polyol and used as seeds to grow a poly‐ and nano‐crystalline (5 nm in diameter) ferrimagnetic (F) CoFe2O4 shell. Transmission electron microscopy (TEM) showed a certain epitaxy between the face‐centered cubic lattices of the AF rock‐salt core and the F spine...
The compound [Eu 5 (C 2 H 4 O 2 ) 6 (CH 3 CO 2 ) 3 ] n was synthesized by dissolving acetate europium salt in ethylene glycol solvent and heating under reflux for a short time. Its structure was solved ab initio from synchrotron powder diffraction data using optimization methods in direct space. The compound has a very large unit-cell volume of 236...
