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Publication date: November 2018Source: Comptes Rendus Chimie, Volume 21, Issue 11Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - November 11, 2018 Category: Chemistry Source Type: research
Commentary on the article Potentialities of using liquefied gases as alternative solvents to substitute hexane for the extraction of aromas from fresh and dry natural products, by Vincent Rapinel, Cyrille Santerre, Farnaz Hanaei, Justine Belay, Nadine Vallet, Njara Rakotomanomana, Alain Vallageas, and Farid Chemat, C. R. Chimie 21 (2018) 590–605
Publication date: November 2018Source: Comptes Rendus Chimie, Volume 21, Issue 11Author(s): Daniel Joulain (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - November 11, 2018 Category: Chemistry Source Type: research
Spectroscopic techniques to characterize the spin state: Vibrational, optical, Mössbauer, NMR, and X-ray spectroscopy
Publication date: Available online 10 November 2018Source: Comptes Rendus ChimieAuthor(s): Juliusz A. Wolny, Volker Schünemann, Zoltán Németh, György VankóAbstractBasic principles and recent work using probes including Mössbauer, optical, X-ray, and vibrational spectroscopies to follow the transitions in spin crossover complexes are reviewed. X-ray spectroscopy, being a relatively lesser-known probe, is discussed in more detail. X-ray spectroscopic methods have been used in the spin crossover field mostly to elucidate surface phenomena, ultrafast dynamics, and high pressure effects, but recent technical developments ...
Source: Comptes Rendus Chimie - November 11, 2018 Category: Chemistry Source Type: research
Light-induced spin crossover—Solution and solid-state processes
This article overviews the different light-induced spin-crossover processes that are induced using ligand photoreaction, photothermal effects, or optical absorption of the center metallic ion. A particular attention is drawn on the light-induced excited spin-state trapping effect, the most studied phenomenon, by discussing the recent developments in terms of description of the initial photoswitching process and the mechanisms developing at different time scales, as well as the lifetime of the photoinduced state.RésuméCette revue présente les différentes approches suivies pour induire une conversion de spin par la lumiÃ...
Source: Comptes Rendus Chimie - November 11, 2018 Category: Chemistry Source Type: research
Spin-crossover nanoparticles and nanocomposite materials
Publication date: Available online 30 October 2018Source: Comptes Rendus ChimieAuthor(s): Lionel Salmon, Laure CatalaAbstractThis contribution reports on the state of the art of the elaboration and the application of nanoparticles (NPs) and nanohybrid/nanocomposite materials based on spin-crossover (SCO) complexes. The first part of this review concerns the syntheses and the characterizations of the physical properties of SCO NPs. All of the methods including homogeneous and heterogeneous media syntheses developed for the elaboration of such NPs and the associated methods used for their morphological characterization are p...
Source: Comptes Rendus Chimie - October 31, 2018 Category: Chemistry Source Type: research
Fe3O4 anodes for lithium batteries: Production techniques and general applications
Publication date: Available online 29 October 2018Source: Comptes Rendus ChimieAuthor(s): Qichao Wu, Rongli Jiang, Lixue Mu, Senyuan XuAbstractIron oxides, such as Fe3O4, are putative anode materials for rechargeable lithium-ion batteries (LIBs). LIBs are extensively used as power sources for electronics. They typically consist of cells, with each cell built out of a lithium cathode and a graphite anode. However, graphite anodes suffer from the disadvantages of significant density, large volume, low energy density, and inferior safety levels. Iron oxides seem to be a promising substitute to the currently used graphite anod...
Source: Comptes Rendus Chimie - October 30, 2018 Category: Chemistry Source Type: research
Pressure effect investigations on spin-crossover coordination compounds
Publication date: Available online 25 October 2018Source: Comptes Rendus ChimieAuthor(s): Ana B. Gaspar, Gábor Molnár, Aurelian Rotaru, Helena J. ShepherdAbstractThe piezochromic properties of spin-crossover complexes have been recognized for a long time, with increasing pressure favouring the low spin state due to its smaller volume and therefore shifting the spin equilibrium towards higher temperatures and accelerating the relaxation at a given temperature. However, the interpretation and quantification of pressure-induced changes have been several times compromised by the relatively poor and incomplete spectral and st...
Source: Comptes Rendus Chimie - October 26, 2018 Category: Chemistry Source Type: research
Low-cost ceramic membranes: Synthesis, classifications, and applications
This article aims to make a thorough review of the different processes used in the synthesis of ceramic membranes using inexpensive raw materials as well as their intrinsic characteristics and industrial applications in several sensitive fields taking into account both economic and environmental aspects. (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - October 26, 2018 Category: Chemistry Source Type: research
Extraction of rare earth metals by organometallic complexation using PC88A
Publication date: Available online 26 October 2018Source: Comptes Rendus ChimieAuthor(s): Archana Kumari, Rekha Panda, Manis K. Jha, Devendra D. PathakAbstractLesser availability, curtailed import/export, increasing demand, and environmental issues related to rare earth metals (REMs) have compelled researchers to investigate for their feasible recovery. Therefore, a solvent extraction process has been developed and validated to recover REMs from monazite leach liquor. At equilibrium pH ∼3.5, 99.4% La, 99.95% Ce, 99.97% Nd, and 99.05% Pr were extracted in 5 min using 5% PC88A at an O/A ratio of 1:1. High separation facto...
Source: Comptes Rendus Chimie - October 26, 2018 Category: Chemistry Source Type: research
Removal of fluoride from groundwater using natural clay (kaolinite): Optimization of adsorption conditions
This article focuses on the application of clay, kaolinite, for the removal of fluoride ion from Saharan groundwater located in the Tindouf region (Algeria) because high concentrations are detected in potable water. Adsorption tests show that fluoride ion removal was efficient when the pH varies from 4.5 to 6. Under these conditions, the adsorption capacities were 0.442 and 0.448Â mg/g, respectively. Kinetic and isotherm adsorption correlations were applied to describe the adsorption process. The results showed that the pseudo-second-order kinetic model and Freundlich isotherm fit well the experimental data. Thermodynamic ...
Source: Comptes Rendus Chimie - October 24, 2018 Category: Chemistry Source Type: research
Filtration of protein-based solutions with ceramic ultrafiltration membrane. Study of selectivity, adsorption, and protein denaturation
Publication date: Available online 19 October 2018Source: Comptes Rendus ChimieAuthor(s): Simona M. Miron, Patrick Dutournié, Kawther Thabet, Arnaud PoncheAbstractProteins are widely used in food or pharmaceutical industry and are often pumped in complex flow systems. Their biological activity is intrinsically related to their conformation in solution. In this work, we studied the state and behavior of proteins in solution during separation/concentration operation in terms of adsorption, molecule agglomeration, and denaturation. Solutions of lysozyme have been filtrated on a ceramic ultrafiltration membrane at high flow v...
Source: Comptes Rendus Chimie - October 20, 2018 Category: Chemistry Source Type: research
Crystal structure and identification of a pyrimido[6,1-b][1,3]oxazin-6-one derivative from the reaction of acrolein with 5-(phenoxymethyl)-2-amino-2-oxazoline
Publication date: Available online 19 October 2018Source: Comptes Rendus ChimieAuthor(s): Jean Guillon, Sandra Rubio, Solène Savrimoutou, François Hallé, Stéphane Moreau, Pascal Sonnet, Mathieu MarchivieAbstractThe X-ray crystal structure of 2-(4,5-dihydro-5-phenoxymethyl-1,3-oxazol-2-ylamino)-7-(2-hydroxy-3-phenoxypropyl)hexahydro-2H,6H-pyrimido[6,1-b][1,3]oxazin-6-one (1), a structure of adduct formed by the reaction of 5-(phenoxymethyl)-2-amino-2-oxazoline and acrolein, has been established. The present work deals with the structural identification of the adduct 1 and presents a plausible mechanism for its formation...
Source: Comptes Rendus Chimie - October 20, 2018 Category: Chemistry Source Type: research
Ultraquick synthesis of hydrotalcite-like compounds as efficient catalysts for the oxidation of volatile organic compounds
In this study, very efficient catalysts were prepared using low microwave power during short irradiation time (40 W, 1 min) as compared with usual microwave parameters.RésuméAfin d'améliorer les propriétés physicochimiques et les activités catalytiques des matériaux hydrotalcite vis-à -vis de l'oxydation totale des composés organiques volatils (COV), des irradiations micro-ondes ont été utilisées comme traitement non conventionnel lors de la synthèse de ces matériaux. Une série d'oxydes mixtes Mg-Co/Al-Fe dérivée des composés hydrotalcites avec un rapport molaire M2+/M3+ = 2 a été synthétisée et é...
Source: Comptes Rendus Chimie - October 20, 2018 Category: Chemistry Source Type: research
CV3 - Editorial Board - English
Publication date: October 2018Source: Comptes Rendus Chimie, Volume 21, Issue 10Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - October 19, 2018 Category: Chemistry Source Type: research
Editorial Board - French
Publication date: October 2018Source: Comptes Rendus Chimie, Volume 21, Issue 10Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - October 19, 2018 Category: Chemistry Source Type: research
