C. Goutaudier's research while affiliated with University of Lyon and other places
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Publications (132)
The environmental performance of advanced engines in terms of combustion and emissions relies strongly on fuel phase change properties, which can be improved by specific additives. Among sustainable additives, tocopherols are particularly promising since they exhibit high dispersion, low toxicity and antioxidant properties, which may allow their in...
Aim:
To assess in vitro the effect of two novel phase separated borosilicate glasses (PSBS) in the system SiO2 -B2 O3 -K2 O-CaO-Al2 O3 on dental pulp cells; and to compare their bioactivity and mechanical properties to a conventional fluoroaluminosilicate glass namely FUJI IX.
Methodology:
The cytocompatibility assessment of the two novel borosi...
Energy, fuel and chemical production like syngas from biomass is increasingly attracting interest in the world, with increasing potential to replace conventional fossil fuels in the energy market.
Biomass gasification has been studied widely as an efficient and sustainable technology for the syngas production.
Thus, raw syngas contains a significan...
As the most promising biomass utilization method,
biomass gasification is gaining attention as a route for biomass energy
production, but the syngas generated from the process contains
unacceptable levels of tar. The syngas in reality leads to a liquid−
liquid−vapor equilibrium. This syngas becomes saturated with water
steam, solvent, and trace of...
A series of novel borosilicate ionomer glasses composed of varying amount of SiO2–B2O3–K2OCaO–Al2O3 were investigated. The influence of the thermal treatment was evaluated in terms of ion release and glass microstructure. Inductively coupled plasma optical emission spectrometry (ICP-OES) and scanning electron microscopy (SEM) were the main analytic...
Biomass is known as a potential renewable energy source which can be used in the gasification process in order to produce biomethane gas. One of the major challenges encountered is the elimination of the high level of tar found in the syngas issued from the gasification process. The main purpose of this work is to conduct experimental measurements...
Health and welfare of population are priority reasons to study the toxic effects of chemical pollutants. These effects can directly produce deterioration of health or can cause less healthful environment toxicity and restricting food production. Thereby, preventing such a consequence is important for human health risk assessment. In recent times, t...
The vapour pressures of the pure components 3,3-diamino-N-methyldipropylamine (DNM) and N,N,N′,N′′,N′′-pentamethyldiethylenetriamine (PMDETA) along with the binary mixtures (DNM + water) and (PMDETA + water) were measured by means of a static apparatus at temperatures between (283 and 363) K. The data were correlated with the Antoine equation. From...
The aqueous solubilities, the octanol-water partition coefficients and the vapor pressures of two food contaminants (dimethyl phthalate-DMP and butyl benzyl phthalate-BBP) have been determined in this work. The aqueous solubility measured by the dynamic saturation method [298.15–328.15 K] were in the order of 10⁻⁴ mol fraction for DMP and 10⁻⁷ for...
A systematic study of the solid-liquid equilibria of the H2O-Co(NO3)2-Ni(NO3)2 ternary system enabled to define the liquidus and the solidus curves of the isotherms at 287.15 K and 313.5 K. Two widespread solid solutions, Co(1-σ)Niσ(NO3)2.6H2O and Ni(1-ω)Coω(NO3)2.6H2O, were observed. They were formed by the substitution of Co²⁺ cations by Ni²⁺ cat...
The comprehension of solid-liquid equilibria involved in the quaternary system NaBH4-NaBO2-NaOH-H2O allows us to follow the evolution of mixtures during the sodium borohydride hydrolysis reaction for hydrogen generation. The addition of sodium hydroxide on saturated solutions of sodium borohydride and metaborate have been studied in a temperature r...
This poster is presented within the European project BioDensol.
During the acid processing of aluminosilicate ores, the precipitation of a solid phase principally consisting of hydrated aluminium hydroxysulfates may be observed. The experimental study of the H2O-Al2O3-SO3 ternary system at 25 ∘C and 101 kPa enabled to describe the solid-liquid equilibra and to identify the nature, the composition and the solubi...
Objective:
Nowadays bioactive glasses are finding increasing applications in medical practice due to their ability to stimulate re-mineralisation. However, they are intrinsically brittle materials and the study of new compositions will open up new scenarios enhancing their mechanical properties and maintaining the high bioactivity for a broader ra...
The isothermal solubility curves of the H2O–Co(NO3)2–Ni(NO3)2 ternary system were studied at 273.15 and 303.15 K, using a synthetic method based on conductivity measurements. The analysis of the equilibrium phases’ composition was conducted by UV–visible spectroscopy. The solid phases were first characterized by powder X-ray diffraction, which show...
Nowadays attention is focused on biomass as a renewable energy source, but still one of the remaining drawbacks to be solved is the elimination of the high level of tar present in the syngas from the gasification process of the biomass. The objective of this work is to perform experimental measurements of liquid–liquid equilibria that will be used...
During the classical production of phosphoric acid, the reaction between sulfuric acid and phosphate rock generates suspension. The latter is subsequently filtered and concentrated by evaporation process resulting in fluorine or acid gas. In this paper, we present a new procedure of phosphoric acid production by using recycled hexafluosilicic acid...
Two new 3D porphyrin-based metal organic frameworks were obtained by solvothermally reacting iron(iii) chloride, a free base (5,10,15,20-tetrakis[4-(2,3,4,5-tetrazolyl)phenyl]porphyrin) (H2TTPP) and either pyrazine or 1,4-diazabicyclo[2.2.2]octane (DABCO). Both MOFs displayed a 3-D open framework of the fry topology, where the inorganic building un...
In this work, we studied the aqueous solubility, vapor pressures of dibutylphthalate (DBP) and di-isobutylphthalate (DIBP) as a function of temperature between 298.15 and 328.15 K and between 313.15 and 423.15 K respectively. The octanol-water partition coefficient was measured at 298.15 K using shake-flask method. For aqueous solubility, measureme...
The solid-liquid equilibria of the H2O-Co(NO3)2-Ni(NO3)2 ternary system were studied at 248.15 K and 258.15 K, using a synthetic method based on conductivity measurements. The obtained results were complemented by chemical and powder X-ray diffraction analyses. The solid phases are ice and two large substitutional solid solutions: Co(1-σ)Niσ(NO3)2....
During the acid processing of aluminosilicate ores, the temporary precipitation of a white solid phase principally consisting in calcium sulfate and aluminium hydroxide and/or sulfates may be observed. This study aimed to determine the nature of the solid phases, their stability and their solubility. Understanding why precipitation occurs and being...
Oil industry accidents and wastes impose an aquatic environmental threat. Remediation techniques and models neglect the extraction of high molecular hydrocarbons due to their challenging experimental characteristics determination. In this presentation, we are going to talk about the different experimental devices we used for the determination of th...
Reaction of iron (IIII) with the free base tetrakis(4-carboxyphenyl)porphyrin (H2TCPP) in presence of different bases leads to the formation of a series of iron/porphyrin metal organic frameworks. Such crystal engineering approach led to the obtaining of four structures presenting three different topologies and inorganic secondary building units (S...
Crystal structure of human tooth enamel was investigated using high-resolution neutron powder diffraction. Excellent agreement between observed and refined patterns is obtained, using the hexagonal hydroxyapatite model for the tooth enamel, where a large hydroxyl deficiency ~70% is found in the 4e site. Rietveld refinements method combined with the...
Salting-out using sodium hydroxide is a simple and relevant method of pre-concentrating organic compounds (amine + hydrazine) in crude synthetic solutions during the preparation of hydrazine products. Liquid–liquid, solid–liquid and solid–liquid–liquid equilibria were determined for the pyrrolidine + water + sodium hydroxide ternary system at 283.1...
To determine the octanol–water partition coefficient (log Kow or log D), a microfluidic method is developed to reduce time and coast of analyze. A double Y serpentine microfluidic chip is fabricated used soft lithography facilities. To generate a biphasic parallel flow, hydrophilic microchannels walls are generated by oxygen plasma treatment. Epifl...
Objective:
The objective was to characterize the crystal structure and to determine the lattice parameters of mineral compounds growing inside the dentinal tubules at the dentin/ BiodentinTMinterface.
Method:
A human molar was prepared with an occlusal cavity and filled with the CaSi cement and then stored at room temperature.
Neutron diffr...
Demixing phenomena in liquid ternary systems are widely used in chemical engineering processes. When a critical point is observed, the composition of this invariant point of major interest is experimentally difficult to determine. A simple calculation method for the critical point is proposed using the experimental tie-lines. The computing treatmen...
Proceedings of International Conference on Inorganic Scintillators and Their Applications SCINT99 01/2000
The interesting point of this work is to increase the amount of produced H2 in order to improve the energy density of the H2 generator system. For this, one of the main challenges is to increase the NaBH4 concentration of the cartridge solution thus avoiding the drawbacks induced by NaBO2 crystallization, but also to control the stability of this s...
To increase the energy density of a hydrogen generator system, the NaBH4 concentration has to be maximized; nevertheless. NaBO2 crystallization must be avoided. Sodium borohydride decomposes spontaneously in water to produce hydrogen and by-products: hydrated sodium borate compounds. Sodium hydroxide is added to the solution to limit this self-deco...
In many cases of miscibility gap in ternary systems, one critical point at least, stable or metastable, can be observed under isobaric and isothermal conditions. The experimental determination of this invariant point is difficult but its knowledge is essential. The authors propose a method for calculating the composition of the invariant solution s...
This work deals with the synthesis, extraction, and purification of a new exocyclic hydrazine with cosmetic applications, N-aminopyrrolidine (NAPY). The final extraction and purification steps of the useful product are often linked to distillation operations. The optimization of these separation conditions requires then the knowledge of the thermod...
Tar is generated in the process by the condensation of the gas resulting from biomass gasification. The objective of this work is a contribution to the database on thermodynamic quantity which will be useful at the operation of tar removal from aqueous medium. With this aim, (liquid + liquid) equilibrium of {water + solvent (paraxylene and methyl h...
The hydrates of cobalt and nickel nitrates are highly relevant as precursors for the preparation of mixed ceramics. In order to verify the numerous bibliographical data, systematic solubility measurements in aqueous medium under atmospheric pressure and a critical evaluation have been undertaken. By taking solvation phenomena into account, it has p...
The binary phase diagram NaBO2–H2O at ambient pressure, which defines the different phase equilibria that could be formed between borates, end-products of NaBH4 hydrolysis, has been reviewed. Five different solid borates phases have been identified: NaBO2·4H2O (Na[B(OH)4]·2H2O), NaBO2·2H2O (Na[B(OH)4]), NaBO2·2/3H2O (Na3[B3O4(OH)4]), NaBO2·1/3H2O (...
Nous avons étudié l'effet d’Al2O3 sur le rendement de récupération de P2O5 dans des conditions simulées de la production industrielle d’acide phosphorique. L’attaque du phosphate naturel par l’acide sulfurique en présence d’acide phosphorique dilué est réalisée sur un pilote semi continu de type S3C à 80°C. Deux échantillons de phosphate naturel d’...
The crystal growth techniques used in industry usually take place in melt and more than 80% of the crystals produced have a congruent melting composition. However, the complexity of single-crystal matrices is constantly increasing (4 constituents or even more) and in these multi-constituent systems, very few are fully stoichiometric compounds with...
communication par affiche
The present study reports fundamental results about the spontaneous hydrolysis of sodium borohydride NaBH4, which is a potential hydrogen storage material for small, portable applications. The reaction (without stabilizing agent or catalyst) was carried out at temperatures of 30–80 °C, initial NaBH4 concentrations of 0.63–6.19 mol L−1 (2.3–18.9 wt%...
We report here the growth of homogeneous and crack-free fiber single crystals composed of Ba2Na1-xYbxNb5O15 (0 ≤ x ≤ 5) using the laser-heated pedestal growth technique (LHPG). The effect of Yb3+ addition to barium sodium niobate (BNN, x = 0), having the tungsten bronze-type structure, was examined at room temperature by X-ray powder diffraction an...
The development of reliable InGaAs laser diode pump sources emitting in the 900-980 nm spectral range is stongly influencing the field of lasers based on Yb3+-doped solid state crystals. Ca5(PO4)3F (C-FAP) and S-FAP (Sr5(PO4)3F) were soon recognized to be favourable hosts for Yb3+ lasing in the nanosecond pulse regime. This fact was supported by an...
With the depletion of fossil fuel sources as well as the global warming issues, biomass is used as a primary energy potential source. Although biomass is getting an enhanced attention as a renewable energy source, many problems has to be solved in the production plants such as the reduction of the high level of tar present in the syngas. Indeed, ta...
It is very rare that a one-step process of extraction leads to the pure compound with a high degree of purity specified by
an industrial application. The various stages of a synthesis process and possible secondary reactions may lead to the synthesis
of more or less complex and highly diluted solutions. In this work, the rationale and strategy for...
The title compound can be prepared either by hydrolysis of NaBH4 (3 equiv.
The preparation of a new trisodium triborate, Na(3)[B(3)O(4)(OH)(4)], and its complete characterization in terms of molecular structure and thermal behavior are reported. Synthesis of this compound was achieved either by NaBH(4) hydrolysis or by thermal treatment of Na[B(OH)(4)].2H(2)O. The crystal structure was determined by single-crystal X-ray d...
It is well known that mass transfer of a solid compound into a liquid phase is characterized by mutual properties of both
sides. Solubilization capacity of the liquid phase is primary affected by its composition in inorganic species inducing salting
in/out effect evaluated by Setschenow constant, generally defined at 298.15 K. On the other hand, th...
Potassium borohydride KBH4 is an attractive chemical hydride for H 2 generation and storage in portable fuel cell applications. Nevertheless, the control of the by-products, in terms of stability and solubility in aqueous solutions, is one of the limiting steps of the hydrolysis reaction of H2 release. We report here some physicochemical properties...
In the present work, hydrogen generation through hydrolysis of a NaBH4(s)/catalyst(s) solid mixture was realized for the first time as a solid/liquid compact hydrogen storage system using Co nanoparticles as a model catalyst. The performance of the system was analysed from both the thermodynamic and kinetic points of view and compared with the clas...
The hydrogen storage capabilities of alkaline borohydrides through a hydrolyzing process were determined by taking into consideration the hydration of the end products. Comparison of LiBH4, NaBH4 and KBH4 showed their storage capacities to be dependent on the composition of the metaborate formed. This composition is ruled by the hydrolysis conditio...
Synthesis, structure refinement and thermal behaviour are reported for a new diphosphate HHoP2O7·3H2O. This salt crystallizes in the triclinic system with space group P1¯and with lattice parameters: a=6.425(5), b=6.912(5), c=9.809(5)Å; α=81.554(5)°, β=80.329(5)°, γ=88.485(5)° and Z=2. The crystal structure is refined to R=0.0443 using 859 reflectio...
Crystal fiber of cubic Yb3+-doped KY3F10 has been grown. Both, mono-doped and concentration gradient fibers were grown by laser-heated pedestal growth (LHPG) method under argon atmosphere. The preparation of feed rod materials under CF4 atmosphere prior to LHPG is efficient to obtain oxygen-free fluorides. Yb3+-doped KY3F10 crystals have excellent...
We investigate the prediction of the infrared laser emission in the Yb 3 + -doped cubic K Y 3 F 10 crystal that can be pumped by a laser diode. Bulky single crystals have been grown by the Czochralski technique at Tohoku University, and crystalline fibers have been grown by the laser heated pedestal growth technique at Claude Bernard/Lyon 1 Univers...
High surface area nanoporous powders of hexagonal boron nitride (h-BN) have been prepared from molecular precursors to be used for hydrogen sequestration. The more promising samples were obtained using a precursor derived from trichloroborazine (TCB). The precursor was first reacted with ammonia at room temperature leading to the molecular complex...
The ytterbium-doped crystals emitting around 1 mum under laser-diode pumping between 900-980 nm have received an increasing interest in recent years as solid-state laser materials for high power or ultra-fast lasers. In this paper, our main objective is to contribute to Yb3+-doped fluorides mainly on CaF2 cubic host which are characterized by a hig...
Spectroscopic characterization is carried out to identify Stark's levels of Yb3+ transitions in several fluoride crystals grown either by the Czochralski technique or by the laser-heated pedestal growth method. Yb3+ concentration dependence of the decay time is analyzed in order to understand involved concentration quenching mechanisms. Laser tests...
The main objective of this paper is to focus on the use of new techniques to specifically characterize BaTiO3 nonlinear nano-crystals as a test case. We use the second harmonic generation (SHG) of an IR YAG:Nd pump laser and detection of the Yb3+ ion pairs to investigate effect of doping and synthesis route (sol–gel between 700 and 1200 °C) on both...
Co-operative luminescence process has been used to prove, co-doping Yb3+-doped CaF{2} fluorite laser crystals with Na+ charge compensator, would break the tendency of Yb3+ ions pair formation.
Nanocrystalline powders of 1% Yb3+-doped BaTiO{3} sintered at different temperatures were obtained by the sol-gel method. The structure of the powders covering crystallite-sizes from 25 to 60 nm depending on the annealing temperature (700-1200circC) was determined from the Scherrer's equation. Second Harmonic Generation (SHG) intensity magnitude is...
Nanocrystalline powders of 1% Yb3+-doped BaTiO3 sintered at different temperatures were obtained by the sol–gel method. The structure of the powders covering crystallite sizes from 25 to 60nm depending on the annealing temperature (700–1200°C), was determined from the Scherrer's equation. Second harmonic generation (SHG) intensity magnitude is comp...
The laser heated pedestal growth (LHPG) technique is suitable to grow crystalline fibers and has been successfully applied for the general study of a lot of optical materials as laser crystals. Our general approach on the research of diode-pumped Yb3+-doped host crystals is presented through typical example of CaF2 fluoride, which is considered amo...
This article is following the first part published recently in this journal [S. Chénais, F. Druon, F. Balembois, P. Georges, A. Brenier, G. Boulon, Opt. Mater. 22 (2003) 99]. Yb3+ concentration dependence of the 2F5/2 excited level experimental decay time in GGG laser crystal was analyzed in order to understand involved concentration quenching mech...
Spectroscopic characterization were carried out to identify Stark’s levels of Yb3+ transitions in the Gd3+ dodecahedral S4 crystallographic site in Gd3Ga5O12 garnet crystals which are grown by the micro-pulling down technique. Yb3+ concentration dependence of the 2F5/2 excited level experimental decay time was analyzed in order to understand involv...
Natural apatitic phosphosilicates, generally called “britholites”, were found to contain certain amounts of radioactive elements or fission products. Thus, britholites have been the object of a great interest because of their potential application as typical matrices for the conditioning of nuclear wastes. In the present report, uranium-doped oxy-s...
Natural apatitic phosphosilicates, generally called “britholites”, were found to contain certain amounts of radioactive elements or fission products. Thus, britholites have been the object of a great interest because of their potential application as typical matrices for the conditioning of nuclear wastes. In the present report, uranium-doped oxy-s...
Single crystals of Ba1-xYbxTiO3 and Ba1-xSrxTiO3 with tetragonal structure were grown by the floating zone (FZ) method using an LHPG (Laser Heated Pedestal Growth) technique. The grown crystals, typically 1 mm in diameter and 8 mm in length, were yellowish transparent. Substitution of more than 2.5 at % Sr for Ba in BaTiO3 and addition of 3 to 5 at...
Ca1-XYbXF2+X crystals were grown by two different methods: simple melting under CF{4} atmosphere and laser heated pedestal growth (LHPG) method under Ar atmosphere. Spectroscopic characterization has been carried out to separate different crystallographic site in Ca1-XYbXF2+X crystals and to identify Stark's levels of Yb3+ transitions. Experimental...
Yb3+ spectroscopic properties are given in garnet crystals. Especially, radiative energy transfer between Yb3+ ions and non-radiative energy transfer between Yb3+ and unexpected rare earth impurities are occurring as quenching mechanisms. Other mechanisms are also suspected from Yb3+ pairs, OH- groups and even traces of Yb2+.
Luminescence investigations of nanocrystalline (nc) BaTiO3 powders doped with Eu3+-ions prepared by the sol–gel method is described. A stability of Eu3+-ions replacing Ba2+-sites up to 1100°C is reported. The effect of BaTiO3 grain sizes on luminescence properties of Eu3+ was noticed. To explain these differences a detailed analysis of luminescence...
A spectroscopic characterization was carried out to identify crystal-field levels for magnetic-dipole transitions of Yb3+ ions located in the Y3+ dodecahedral S4 crystallographic site in YLiF4 (YLF) crystals which were grown either by the Czochralski technique or by the laser heated pedestal growth (LHPG) technique. The concentration dependence of...
Ca1−XYbXF2+X crystals were grown by two different methods: simple melting under CF4 atmosphere and the laser heated pedestal growth (LHPG) method under Ar atmosphere. Spectroscopic characterization (absorption, emission, Raman spectroscopy and decay curves) was carried out to identify Stark levels of Yb3+ transitions in the different crystallograph...
The quaternary phase diagram CaO-La$_2$O$_3$-SiO$_2$-P$_2$O$_5$ was investigated in order to delimit an existence domain of single-phase oxy-silicophosphates. The studied samples were synthesized by high-temperature solid state reaction ($1200\sim1400^{\circ}$C). The uranium solubility in Ca$_5$La$_5$(SiO$_4$)$_3$(PO$_4$)$_3$O$_2$ apatites was also...
Rare earth borates and aluminoborates single crystals were investigated for their applications as laser host materials and scintillators. The investigation of the ternary systcm Ln$_2$O$_3$-Al$_2$O$_3$-B$_2$O$_3$ (Ln = Gd) was undertaken in order to determine the thermal behavior, the best conditions of the growth from a melt and their ability to b...
Eutectic fiber belongs to the Y$_2$O$_3$Al$_2$O$_3$ system were grown using Laser Heated Pedestal growth technique. We have controlled the fiber and diameter shape during the growth process. The interface of the melting zone was been plane. The fibers length was about few centimetre and are cracks and defects free. The eutectic fibers have high tem...
Rare earth borates and aluminoborates single crystals were investigated for their applications as laser host materials and scintillators. The investigation of the ternary system Ln2O3-Al 2O3-B2O3 (Ln = Gd) was undertaken in order to determine the thermal behavior, the best conditions of the growth from a melt and their ability to be reproduced. In...
The mu-PD (mu-Micro-Pulling Down) and LHPG (Laser Heated Pedestal Growth) techniques are suitable for growing crystalline fibres and they have been successfully applied for the study of a lot of optical materials such as laser crystals. Our general approach of the research of diode-pumped Yb3+-doped host crystals is presented through three typical...