A5006202791- Characterization and Applications of Magnetic Nanoparticles
- Spectroscopy and Quantum Chemical Studies
- NMR spectroscopy and applications
- Electrostatics and Colloid Interactions
- Geomagnetism and Paleomagnetism Studies
- Ionic liquids properties and applications
- Electrochemical Analysis and Applications
- Surfactants and Colloidal Systems
- Material Dynamics and Properties
- Field-Flow Fractionation Techniques
- Extraction and Separation Processes
- Advanced Thermodynamics and Statistical Mechanics
- Cultural Heritage Materials Analysis
- Thermodynamic properties of mixtures
- thermodynamics and calorimetric analyses
- Chemical and Physical Properties in Aqueous Solutions
- Advanced NMR Techniques and Applications
- Magnetic and Electromagnetic Effects
- Theoretical and Computational Physics
- Spectroscopy and Chemometric Analyses
- Gold and Silver Nanoparticles Synthesis and Applications
- Conducting polymers and applications
- Soil and Unsaturated Flow
- Insect and Arachnid Ecology and Behavior
- Pickering emulsions and particle stabilization
Sorbonne Université
2016-2025
Centre National de la Recherche Scientifique
2015-2024
PHENIX laboratory
2015-2024
Sorbonne Paris Cité
2023
Délégation Ile-de-France Villejuif
2021
University of Bayreuth
2021
Institute of Molecular Physics of the Polish Academy of Sciences
2021
Polish Academy of Sciences
2021
University of Kassel
2021
Délégation Paris 6
2014-2018
Magnetite and maghemite multicore nanoflowers (NFs) synthesized using the modified polyol-mediated routes are to date among most effective nanoheaters in magnetic hyperthermia (MHT). Recently, magnetite NFs have also shown high photothermal (PT) performances desired second near-infrared (NIR-II) biological window, making them attractive field of nanoparticle-activated thermal therapies. However, what makes efficient heating agents both modalities still remains an open question. In this work,...
The dynamics of particles in solution or suspension is influenced by thermal fluctuations and hydrodynamic interactions. Several mesoscale methods exist to account for these solvent-induced effects such as Brownian with interactions hybrid molecular dynamics-stochastic rotation methods. Here we compare two ways coupling solutes the solvent stochastic (SRD) without explicit In first SRD scheme [SRD collisional (CC)] participate step second central force (CFC)] interact through direct forces...
The absence of hydrophobicity-driven cation aggregation is reported in TMABr and TBABr aqueous solutions, by means microscopic simulations.
Since antiquity, artists have been using egg yolk as an additive in the preparation of \textit{tempera} paints. Mixture and water is dispersing medium for pigments to start with, but once on canvas, it acts a binder plasticiser, procuring adhesive properties applied paint. A series water/egg mixtures investigated here combination rheology, Fourier Transform Infrared (FTIR) spectroscopy, Nuclear Magnetic Resonance spectroscopy (NMR) small angle X-ray scattering (SAXS). The effects dilution...
The Seebeck and Soret coefficients of ionically stabilized suspension maghemite nanoparticles in dimethyl sulfoxide are experimentally studied as a function nanoparticle volume fraction. In the presence temperature gradient, charged colloidal experience both thermal drift due to their interactions with solvent electric forces proportional internal thermoelectric field. resulting thermodiffusion is observed through forced Rayleigh scattering measurements, while field accessed voltage...
Specific effects of the sodium salts m- and p-hydroxybenzoates (m-HB p-HB) on aggregation process dodecyltrimethylammonium chloride have been investigated by isothermal titration calorimetry, electrical conductivity, (1)H NMR compared with already reported data for salt o-hydroxybenzoate (o-HB). For p-HB, it has found that aggregate is only formed spherical micelles at all p-HB concentrations. On other side, situation more complex o-HB, where two distinct states can be involved, depending...
The synthesis of gold nanoparticles (Au NPs) from HAuCl4 by using EDTA as a reducing agent is investigated for the first time UV–vis spectroscopy, transmission electron microscopy (TEM), and dynamic light scattering (DLS). We show that size resulting Au NPs dictated reactivity ionic Au(III) species charge density molecules with pH. Moreover varying pH reaction media, can be tuned 25 to 100 nm. Investigation nucleation growth time-resolved TEM revealed presence nanowires progressively...
The results of diffusion and electrophoretic NMR (eNMR) measurements are reported for a series tetramethylammonium (TMA) electrolytes (with sulphate, fluoride, acetate, chloride, bromide, nitrate, iodide perchlorate as anions) in deuterated solvents such water, dimethylsulphoxide (DMSO), acetonitrile, methanol ethanol. In addition, similar data presented aqueous solutions tetraalkylammonium salts with increasing alkyl chain length. combination eNMR yields the effective charge TMA cation....
Thermodiffusion of different ferrite nanoparticles, ∼10 nm in diameter, is explored by forced Rayleigh scattering tailor-made aqueous dispersions stabilized electrosteric interparticle interactions.
In the present study, structure of monophasic ionic magnetic fluids under a static field is explored. these aqueous electrostatically stabilized ferrofluids, we vary both isotropic interparticle interactions and anisotropic dipolar interaction by tuning strength size nanoparticles. Small angle neutron scattering measurements carried out on nanoparticles dispersed in light water exhibit miscellaneous 2D nuclear patterns with various q-dependent anisotropies. this nondeuterated solvent where...
Structure analysis of a magnetic fluid (nanoparticles maghemite dispersed in water with charge stabilization and without surfactant) by means small-angle neutron scattering is presented. A combination the contrast variation technique polarized neutrons was applied. In first case, curves obtained for unmagnetized heavy content carrier are treated terms basic functions approach. The almost homogeneous character nanoparticles respect to nuclear length density makes it possible separate...
NMR relaxation of water protons as a sensitive probe ion-specific effects at protein surfaces.
Magnetic nanoparticle assemblies in high concentrations can exhibit spin glass like properties the low temperature phase due to influence of strong dipolar interactions. To address question extent which these “superspin” glasses mimic those an atomic glass, several homogeneously dispersed γ-Fe2O3 varying volume fraction have been studied. In a concentrated sample, main features observed including aging phenomena for we proposed rescaling.
We present Brownian dynamics simulations of real charge-stabilized ferrofluids, which are stable colloidal dispersions magnetic nanoparticles, with and without the presence an external field. The suspensions treated as collections monodisperse spherical particles, bearing point dipoles at their centers undergoing translational rotational motions. overall repulsive isotropic interactions between governed by electrostatic repulsions, taken into account a one-component effective pair...
We perform in this paper a kinetic study of the photoelectrochemical responses nanoporous thin photoactive films. The films were fabricated by layer-by-layer assembly positively charged polyelectrolytes (poly-l-Lysine, pLys) and negatively semiconductor nanoparticles (NPs) on carboxylic acid terminated alkanethiol-modified gold electrode. Two types NPs used to build uniform films: cadmium selenide (CdSe) selenide/cadmium sulfide core/shell (CdSe@CdS). Large photocathodic photoanodic currents...
Fluorescence confocal laser scanning microscopy (CLSM) has been applied to quantify pH distribution in a coaxial flow microreactor. The methodology consists of utilizing micromolar concentration the common dye fluorescein, whose fluorescence solution strongly increases above 6.2, order map changes central jet stream where an acid−base reaction proceeds. This experimental method calibrated thanks theoretical study. latter was based on numerical ion transport equations which takes proper...
We used several complementary experimental and theoretical tools to characterise the charge properties of well-defined maghemite nanoparticles in solution as a function volume fraction. The radius is equal 6 nm. structural was measured from chemical titration found high enough expect some counterions be electrostatically attracted surface, decreasing apparent nanoparticle. Direct-current conductivity measurements were interpreted by an analytical transport theory deduce value this charge,...