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Hervé Martinez - One of the best experts on this subject based on the ideXlab platform.

  • thermal behaviors and grafting process of ldh Benzene Derivative hybrid systems
    Thermochimica Acta, 2012
    Co-Authors: Solenne Fleutot, B. Dieudonné, Guillaume Renaudin, Jeancharles Dupin, Hervé Martinez
    Abstract:

    Abstract Thermal behaviors of four hybrid layered double hydroxide (LDH) phases have been studied by thermogravimetric analyses coupled with mass spectroscopy, temperature dependence of X-ray powder diffraction measurements, and temperature dependence of infrared spectroscopy measurements. Inorganic zinc–aluminium LDH main layers (with a Zn2+/Al3+ cationic ratio of 2) inserted the following four organic anions: Benzene carboxylate, 4-hydroxy-Benzene carboxylate, Benzene sulfonate and 4-hydroxy-Benzene sulfonate. The four LDH hybrids have been synthesized by the coprecipitation method. The as-prepared samples have been characterized and their compositions were determined. Thermal evolution of the crystalline phases during the dehydration (occurring before 200 °C) and the dehydroxylation (occurring between 200 and 300 °C) gave evidence for organic anion grafting onto the inorganic main layer. The thermal stability of the LDH hybrid system depends on the nature of the intercalated aromatic anion. The thermal grafting process can be monitored, as well as its thermal reversibility, by choosing the functionalizations of the benzenic anion and the temperature of the applied heat treatment.

  • Thermal behaviors and grafting process of LDH/Benzene Derivative hybrid.
    Thermochimica Acta, 2012
    Co-Authors: Solenne Fleutot, B. Dieudonné, J. C. Dupin, Guillaume Renaudin, Hervé Martinez
    Abstract:

    Thermal behaviors of four hybrid layered double hydroxide (LDH) phases have been studied by thermogravimetric analyses coupled with mass spectroscopy, temperature dependence of X-ray powder diffraction measurements, and temperature dependence of infrared spectroscopy measurements. Inorganic zinc-aluminium LDH main layers (with a Zn2+/Al3+ cationic ratio of 2) inserted the following four organic anions: Benzene carboxylate, 4-hydroxy-Benzene carboxylate, Benzene sulfonate and 4-hydroxyBenzene sulfonate. The four LDH hybrids have been synthesized by the coprecipitation method. The as-prepared samples have been characterized and their compositions were determined. Thermal evolution of the crystalline phases during the dehydration (occurring before 200 ◦C) and the dehydroxylation (occurring between 200 and 300 ◦C) gave evidence for organic anion grafting onto the inorganic main layer. The thermal stability of the LDH hybrid system depends on the nature of the intercalated aromatic anion. The thermal grafting process can be monitored, as well as its thermal reversibility, by choosing the functionalizations of the benzenic anion and the temperature of the applied heat treatment.

  • Experimental (X-Ray Photoelectron Spectroscopy) and theoretical studies of Benzene based organics intercalated into layered double hydroxide
    Solid State Sci., 2011
    Co-Authors: S. Fleutot, Hervé Martinez, Jeancharles Dupin, Isabelle Baraille, C. Forano, G. Renaudin, Danielle Gonbeau
    Abstract:

    The present paper deals with a fine physico-chemical analysis of some hybrid materials combining an inorganic layered double hydroxide phase (LDH) with an organic Benzene Derivative entity R′-C6H4-R with R = -SO3-, -CO2- and R′ = -H, -OH. The main topic of this work is, in a nanoscale, to propose a way to approach the understanding of the interactions between inorganic and organic sub-systems. The role of the anionic headgroup R is discussed in term of reactivity with the mineral support. The classical expertise of materials via the PXRD technique puts into light an effective LDH interlayer space enlargement with the organics incorporation and a minimum angle of inclination for every organics within the LDH matrix. The originality of this study is to use the X-Ray Photoelectron spectroscopy (XPS) as a local probe of the chemical environments of the headgroup of the organic entities. In a parallel way, some quantum calculations (by using molecular and periodical codes) are carried out to best appreciate the electronic and structural evolutions before and after the intercalation step. A specific reactivity of the -SO3- group compared with the -CO2- one is evidenced. Moreover, a correlation at the first order is then set up between the net charges of atoms and the XPS binding energies of their core levels.

  • a new route for local probing of inner interactions within a layered double hydroxide Benzene Derivative hybrid material
    Physical Chemistry Chemical Physics, 2009
    Co-Authors: Solenne Fleutot, Guillaume Renaudin, Jeancharles Dupin, Isabelle Baraille, Claude Forano, Fabrice Leroux, Danielle Gonbeau, Hervé Martinez
    Abstract:

    This paper presents the preparation and characterization of hybrid hydrotalcite-type layered double hydroxides (Zn1−xAlx(OH)2HBSx·nH2O, with x = 0.33) where HBS is the 4-phenol sulfonate, with a detailed analysis of the grafting process of this organic entity onto the host lattice. As a set of the usual techniques (XRD, TG-DT/MS, FTIR and 27Al MAS NMR) was used to characterize the hybrid materials, this work focuses on a joint study by X-ray photoelectron spectroscopy and some quantum-calculation modeling in order to highlight the nature of the interactions between the organic and the mineral sub-systems. For the as-prepared hybrid material, the main results lead to a quasi-vertical orientation of the organic molecules within the mineral sheets via H-bond stabilization. By heating the hybrid material up to 200 °C, the structure shrinks with the condensation of the organics; the different theoretical modeling done gives an energy-stable situation when a direct attachment of the HBS sulfonate group sets up with the mineral layers, in agreement with the recorded XPS experimental data.

Jiajie Long - One of the best experts on this subject based on the ideXlab platform.

  • solubility and loading ability of Benzene Derivative drugs onto viscose substrate in supercritical carbon dioxide and their release behavior in solvent
    Journal of Cleaner Production, 2020
    Co-Authors: Weiwei Zhu, Wei Shi, Meiwu Shi, Jiajie Long
    Abstract:

    Abstract An investigation of the solubility and loading ability (LA) of nine Benzene Derivative drugs with different chemical structures onto viscose substrate in supercritical carbon dioxide fluid (SCF–CO2) was performed, in order to construct some bases at the first time for manufacturing drug-loaded cosmetic textiles by employing an ecofriendly, sustainable supercritical methodology. Moreover, a release behavior of each of the loaded drugs from viscose substrate in a solvent of ethanol was also disclosed. The results show that a more hydrophobicity of the substituent group linked on the Benzene ring readily led to a higher solubility in SCF-CO2, while an overlong aliphatic tail and its molar mass also brought some effects on its dissolving behavior. As for the isomer drugs, the locations of a methoxy group (-O-CH3) at the ortho-position to the carboxyl group (-(C O)–OH) in the Benzene ring resulted in the highest solubility, while a para-position showed the lowest solubility in SCF-CO2. The loading ability (LA) for most of the tested drugs mainly depended on their solubilities in SCF-CO2, and was also affected by the interactions between the drug and viscose substrate. The investigation of drug release reveals that the LA played a predominant role in the release behaviors of the tested drugs with different substituent groups, molar mass or aliphatic chains and isomer structures. Moreover, the drug molecular size and its interaction with viscose substrate also presented effects on the subsequent release behaviors in the utilized release system and conditions.

Meiwu Shi - One of the best experts on this subject based on the ideXlab platform.

  • solubility and loading ability of Benzene Derivative drugs onto viscose substrate in supercritical carbon dioxide and their release behavior in solvent
    Journal of Cleaner Production, 2020
    Co-Authors: Weiwei Zhu, Wei Shi, Meiwu Shi, Jiajie Long
    Abstract:

    Abstract An investigation of the solubility and loading ability (LA) of nine Benzene Derivative drugs with different chemical structures onto viscose substrate in supercritical carbon dioxide fluid (SCF–CO2) was performed, in order to construct some bases at the first time for manufacturing drug-loaded cosmetic textiles by employing an ecofriendly, sustainable supercritical methodology. Moreover, a release behavior of each of the loaded drugs from viscose substrate in a solvent of ethanol was also disclosed. The results show that a more hydrophobicity of the substituent group linked on the Benzene ring readily led to a higher solubility in SCF-CO2, while an overlong aliphatic tail and its molar mass also brought some effects on its dissolving behavior. As for the isomer drugs, the locations of a methoxy group (-O-CH3) at the ortho-position to the carboxyl group (-(C O)–OH) in the Benzene ring resulted in the highest solubility, while a para-position showed the lowest solubility in SCF-CO2. The loading ability (LA) for most of the tested drugs mainly depended on their solubilities in SCF-CO2, and was also affected by the interactions between the drug and viscose substrate. The investigation of drug release reveals that the LA played a predominant role in the release behaviors of the tested drugs with different substituent groups, molar mass or aliphatic chains and isomer structures. Moreover, the drug molecular size and its interaction with viscose substrate also presented effects on the subsequent release behaviors in the utilized release system and conditions.

Solenne Fleutot - One of the best experts on this subject based on the ideXlab platform.

  • thermal behaviors and grafting process of ldh Benzene Derivative hybrid systems
    Thermochimica Acta, 2012
    Co-Authors: Solenne Fleutot, B. Dieudonné, Guillaume Renaudin, Jeancharles Dupin, Hervé Martinez
    Abstract:

    Abstract Thermal behaviors of four hybrid layered double hydroxide (LDH) phases have been studied by thermogravimetric analyses coupled with mass spectroscopy, temperature dependence of X-ray powder diffraction measurements, and temperature dependence of infrared spectroscopy measurements. Inorganic zinc–aluminium LDH main layers (with a Zn2+/Al3+ cationic ratio of 2) inserted the following four organic anions: Benzene carboxylate, 4-hydroxy-Benzene carboxylate, Benzene sulfonate and 4-hydroxy-Benzene sulfonate. The four LDH hybrids have been synthesized by the coprecipitation method. The as-prepared samples have been characterized and their compositions were determined. Thermal evolution of the crystalline phases during the dehydration (occurring before 200 °C) and the dehydroxylation (occurring between 200 and 300 °C) gave evidence for organic anion grafting onto the inorganic main layer. The thermal stability of the LDH hybrid system depends on the nature of the intercalated aromatic anion. The thermal grafting process can be monitored, as well as its thermal reversibility, by choosing the functionalizations of the benzenic anion and the temperature of the applied heat treatment.

  • Thermal behaviors and grafting process of LDH/Benzene Derivative hybrid.
    Thermochimica Acta, 2012
    Co-Authors: Solenne Fleutot, B. Dieudonné, J. C. Dupin, Guillaume Renaudin, Hervé Martinez
    Abstract:

    Thermal behaviors of four hybrid layered double hydroxide (LDH) phases have been studied by thermogravimetric analyses coupled with mass spectroscopy, temperature dependence of X-ray powder diffraction measurements, and temperature dependence of infrared spectroscopy measurements. Inorganic zinc-aluminium LDH main layers (with a Zn2+/Al3+ cationic ratio of 2) inserted the following four organic anions: Benzene carboxylate, 4-hydroxy-Benzene carboxylate, Benzene sulfonate and 4-hydroxyBenzene sulfonate. The four LDH hybrids have been synthesized by the coprecipitation method. The as-prepared samples have been characterized and their compositions were determined. Thermal evolution of the crystalline phases during the dehydration (occurring before 200 ◦C) and the dehydroxylation (occurring between 200 and 300 ◦C) gave evidence for organic anion grafting onto the inorganic main layer. The thermal stability of the LDH hybrid system depends on the nature of the intercalated aromatic anion. The thermal grafting process can be monitored, as well as its thermal reversibility, by choosing the functionalizations of the benzenic anion and the temperature of the applied heat treatment.

  • a new route for local probing of inner interactions within a layered double hydroxide Benzene Derivative hybrid material
    Physical Chemistry Chemical Physics, 2009
    Co-Authors: Solenne Fleutot, Guillaume Renaudin, Jeancharles Dupin, Isabelle Baraille, Claude Forano, Fabrice Leroux, Danielle Gonbeau, Hervé Martinez
    Abstract:

    This paper presents the preparation and characterization of hybrid hydrotalcite-type layered double hydroxides (Zn1−xAlx(OH)2HBSx·nH2O, with x = 0.33) where HBS is the 4-phenol sulfonate, with a detailed analysis of the grafting process of this organic entity onto the host lattice. As a set of the usual techniques (XRD, TG-DT/MS, FTIR and 27Al MAS NMR) was used to characterize the hybrid materials, this work focuses on a joint study by X-ray photoelectron spectroscopy and some quantum-calculation modeling in order to highlight the nature of the interactions between the organic and the mineral sub-systems. For the as-prepared hybrid material, the main results lead to a quasi-vertical orientation of the organic molecules within the mineral sheets via H-bond stabilization. By heating the hybrid material up to 200 °C, the structure shrinks with the condensation of the organics; the different theoretical modeling done gives an energy-stable situation when a direct attachment of the HBS sulfonate group sets up with the mineral layers, in agreement with the recorded XPS experimental data.

Weiwei Zhu - One of the best experts on this subject based on the ideXlab platform.

  • solubility and loading ability of Benzene Derivative drugs onto viscose substrate in supercritical carbon dioxide and their release behavior in solvent
    Journal of Cleaner Production, 2020
    Co-Authors: Weiwei Zhu, Wei Shi, Meiwu Shi, Jiajie Long
    Abstract:

    Abstract An investigation of the solubility and loading ability (LA) of nine Benzene Derivative drugs with different chemical structures onto viscose substrate in supercritical carbon dioxide fluid (SCF–CO2) was performed, in order to construct some bases at the first time for manufacturing drug-loaded cosmetic textiles by employing an ecofriendly, sustainable supercritical methodology. Moreover, a release behavior of each of the loaded drugs from viscose substrate in a solvent of ethanol was also disclosed. The results show that a more hydrophobicity of the substituent group linked on the Benzene ring readily led to a higher solubility in SCF-CO2, while an overlong aliphatic tail and its molar mass also brought some effects on its dissolving behavior. As for the isomer drugs, the locations of a methoxy group (-O-CH3) at the ortho-position to the carboxyl group (-(C O)–OH) in the Benzene ring resulted in the highest solubility, while a para-position showed the lowest solubility in SCF-CO2. The loading ability (LA) for most of the tested drugs mainly depended on their solubilities in SCF-CO2, and was also affected by the interactions between the drug and viscose substrate. The investigation of drug release reveals that the LA played a predominant role in the release behaviors of the tested drugs with different substituent groups, molar mass or aliphatic chains and isomer structures. Moreover, the drug molecular size and its interaction with viscose substrate also presented effects on the subsequent release behaviors in the utilized release system and conditions.