During the past decade, research in the area of synthesis and applications of nanostructured tita... more During the past decade, research in the area of synthesis and applications of nanostructured titanium dioxide (NS TiO2) has become tremendous. NS TiO2 materials have shown great potential and a wide range of applications. The decrease in the particle size and the increase of the surface/volume ratio lead to the increase of the specific surface and the modification of the physicochemical properties and the appearance of new interesting properties (photocatalytic, optical, magnetic, electronic...). Their new morphology even allows the appearance of new biological properties. NS TiO2 can thus be used for the same applications as those known for their precursors before transformation and their nanostructures are accompanied by new properties allowing applications. This chapter briefly describes the synthesis process of the different NS TiO2, their chemical and surface modifications, and their application. The preparation of NS TiO2, including nanoparticles, nanorods, nanowires, nanoshee...
In this study, polyphenols have been extracted from solid residues and leaves of olive tree (Olea... more In this study, polyphenols have been extracted from solid residues and leaves of olive tree (Olea europaea L) in order to assess this vegetable biomass by evaluation of their capacity as a natural antioxidants. The anti-oxidative activity was tested by addition of these extracts on commercial olive oil samples. The olive oil stability has been measured by accelerated oxidation under a simulated storage conditions (60°C/15 days). The change in the oxidation state was followed by measuring of the free acidity, peroxide value (PV) and the specific extinction at 270 nm. The assessment of enriched oils showed that polyphenols from olive by-products play a key role in reducing of oxidative deterioration of the oil. The results suggest the introduction of olive leaves and solid residues extracts in food preparation, both during storage or heating food, for better preservation.
Chemical contamination of water from a wide range of toxic compounds, especially heavy metals, is... more Chemical contamination of water from a wide range of toxic compounds, especially heavy metals, is a critical environmental problem due to their potential human toxicity. Therefore, development of technologies that allow the removal of toxic pollutants from wastewater is a need. Among all the common heavy metals treatment processes, biosorption is one of the more popular and efficient processes. The important number of publications concerning adsorption and remediation of metal ions from aqueous solution by natural and modified polysaccharides shows an increasing interest in biopolymer uses for environment preservation. The present review describes recent developments on biosorption processes using agricultural by-products, mainly mono- and polysaccharides extracted from natural resources. General considerations on metal ions complexation mechanism and interactions between metals and saccharides are first described. Then, a review on metal ions biosorption processes and recent develo...
A series of fatty acid cellulose esters (FACEs) with both various degrees of substitution (from D... more A series of fatty acid cellulose esters (FACEs) with both various degrees of substitution (from DS = 1.7 to 3) and side chain length were obtained by grafting aliphatic acid chlorides (from C10 to C16) onto cellulose backbone, in a homogeneous LiCl/DMAc medium. These materials were characterized by Fourier Transformed InfraRed (FTIR) and Nuclear Magnetic Resonance of Proton (1H NMR) spectroscopies, as well as Wide Angle X-ray Scattering (WAXS), Differential Scanning Calorimetry (DSC), mechanical analyses and chemical resistance to concentrated acid and alkali solutions. Whatever the alkyl chains length and the DS, all samples displayed a layered structure composed of a planar arrangement of parallel cellulosic backbones with fully extended flexible side chains oriented perpendicular to the planar structure without interdigitation. The alkyl chains were able to crystallize as soon as they are long enough. As the DS decreased, the plasticizing effect of the alkyl chains was less pronounced and their ability to crystallize was improved. Regarding the mechanical behavior and the chemical resistance, similar results were observed whatever the DS is.
During the past decade, research in the area of synthesis and applications of nanostructured tita... more During the past decade, research in the area of synthesis and applications of nanostructured titanium dioxide (NS TiO2) has become tremendous. NS TiO2 materials have shown great potential and a wide range of applications. The decrease in the particle size and the increase of the surface/volume ratio lead to the increase of the specific surface and the modification of the physicochemical properties and the appearance of new interesting properties (photocatalytic, optical, magnetic, electronic...). Their new morphology even allows the appearance of new biological properties. NS TiO2 can thus be used for the same applications as those known for their precursors before transformation and their nanostructures are accompanied by new properties allowing applications. This chapter briefly describes the synthesis process of the different NS TiO2, their chemical and surface modifications, and their application. The preparation of NS TiO2, including nanoparticles, nanorods, nanowires, nanoshee...
In this study, polyphenols have been extracted from solid residues and leaves of olive tree (Olea... more In this study, polyphenols have been extracted from solid residues and leaves of olive tree (Olea europaea L) in order to assess this vegetable biomass by evaluation of their capacity as a natural antioxidants. The anti-oxidative activity was tested by addition of these extracts on commercial olive oil samples. The olive oil stability has been measured by accelerated oxidation under a simulated storage conditions (60°C/15 days). The change in the oxidation state was followed by measuring of the free acidity, peroxide value (PV) and the specific extinction at 270 nm. The assessment of enriched oils showed that polyphenols from olive by-products play a key role in reducing of oxidative deterioration of the oil. The results suggest the introduction of olive leaves and solid residues extracts in food preparation, both during storage or heating food, for better preservation.
Chemical contamination of water from a wide range of toxic compounds, especially heavy metals, is... more Chemical contamination of water from a wide range of toxic compounds, especially heavy metals, is a critical environmental problem due to their potential human toxicity. Therefore, development of technologies that allow the removal of toxic pollutants from wastewater is a need. Among all the common heavy metals treatment processes, biosorption is one of the more popular and efficient processes. The important number of publications concerning adsorption and remediation of metal ions from aqueous solution by natural and modified polysaccharides shows an increasing interest in biopolymer uses for environment preservation. The present review describes recent developments on biosorption processes using agricultural by-products, mainly mono- and polysaccharides extracted from natural resources. General considerations on metal ions complexation mechanism and interactions between metals and saccharides are first described. Then, a review on metal ions biosorption processes and recent develo...
A series of fatty acid cellulose esters (FACEs) with both various degrees of substitution (from D... more A series of fatty acid cellulose esters (FACEs) with both various degrees of substitution (from DS = 1.7 to 3) and side chain length were obtained by grafting aliphatic acid chlorides (from C10 to C16) onto cellulose backbone, in a homogeneous LiCl/DMAc medium. These materials were characterized by Fourier Transformed InfraRed (FTIR) and Nuclear Magnetic Resonance of Proton (1H NMR) spectroscopies, as well as Wide Angle X-ray Scattering (WAXS), Differential Scanning Calorimetry (DSC), mechanical analyses and chemical resistance to concentrated acid and alkali solutions. Whatever the alkyl chains length and the DS, all samples displayed a layered structure composed of a planar arrangement of parallel cellulosic backbones with fully extended flexible side chains oriented perpendicular to the planar structure without interdigitation. The alkyl chains were able to crystallize as soon as they are long enough. As the DS decreased, the plasticizing effect of the alkyl chains was less pronounced and their ability to crystallize was improved. Regarding the mechanical behavior and the chemical resistance, similar results were observed whatever the DS is.
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Papers by Nicolas Joly