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Papers by Fabrice Gouanve
Advanced Functional Materials, 2007
... Way to Probe the Dye Accessibility in Nano-Sized Templates** By Fabrice Gouanvé, Thomas Schus... more ... Way to Probe the Dye Accessibility in Nano-Sized Templates** By Fabrice Gouanvé, Thomas Schuster, Emmanuel Allard, Rachel Méallet-Renault, and Chantal Larpent* 1. Introduction Fluorescent nanoparticles have attracted increasing ...
Journal of Membrane Science, 2015
This study deals with water sorption characteristics and gas barrier properties of sodium caseina... more This study deals with water sorption characteristics and gas barrier properties of sodium caseinate based edible films as a function of processing type and processing additives. Two processing routes are adopted: solution casting and blown-film-extrusion. Two processing additives are used: glycerol as plasticizer and ethanol as protein denaturing agent. It is shown at first that the water and gas transport properties are neither affected by the processing technology nor by the use of ethanol during the fabrication step. Water sorption and thermal properties of blown films prepared for glycerol contents varying from 15 to 25 wt% are then studied for a wide range of relative humidity. The determination of the water sorption isotherms and their modeling by Park's equation as well as the study of the water sorption kinetics parameters allow discussing the sorption mechanisms as a function of the respective plasticizing effect of glycerol and water, on one hand and of the ability of water molecules to form clusters within the material, on the other hand. The decrease of the glass transition temperature values of the films as a function of increasing water content is analyzed thanks to Gordon-Taylor equation and it is related to the respective plasticizing role of glycerol and water, as evidenced from water sorption analysis.
European polymer …, 2007
Composite materials are usually reinforced by synthetic fibers as carbon, glass etc.. .. Because ... more Composite materials are usually reinforced by synthetic fibers as carbon, glass etc.. .. Because of their good mechanical properties and low density, natural fibers are being considered more preferentially as reinforcement. The application of natural fibers as reinforcements in composite materials requires a strong adhesion between the fiber and the matrix. The poor resistance towards water absorption is one of the drawbacks of natural fibers which makes it more important to understand the dynamic properties of penetration of water molecules through these heterogeneous materials. Water vapour sorption kinetics in natural flax fibers have been performed at 25°C by using an electronic microbalance (IGA, Hiden). By using the Fickian model for a complete cylinder water diffusion coefficients have been determined and calculated at short times (first half-sorption) and long times (second half-sorption) of kinetic curve and for different water activities. The values obtained for D 1 and D 2 are rather similar on the all range of water activity. Generally, water diffusivity increases and then decreases with water activity. The increase of diffusivity at low water activities may be explained on the basis of the dual mode sorption (Langmuir and Henry sorption's combination) whereas the decrease for the higher activities can be attributed to the immobilization of sorbed water molecules due to the water clustering.
Advanced Functional Materials, 2007
... Way to Probe the Dye Accessibility in Nano-Sized Templates** By Fabrice Gouanvé, Thomas Schus... more ... Way to Probe the Dye Accessibility in Nano-Sized Templates** By Fabrice Gouanvé, Thomas Schuster, Emmanuel Allard, Rachel Méallet-Renault, and Chantal Larpent* 1. Introduction Fluorescent nanoparticles have attracted increasing ...
Journal of Membrane Science, 2015
This study deals with water sorption characteristics and gas barrier properties of sodium caseina... more This study deals with water sorption characteristics and gas barrier properties of sodium caseinate based edible films as a function of processing type and processing additives. Two processing routes are adopted: solution casting and blown-film-extrusion. Two processing additives are used: glycerol as plasticizer and ethanol as protein denaturing agent. It is shown at first that the water and gas transport properties are neither affected by the processing technology nor by the use of ethanol during the fabrication step. Water sorption and thermal properties of blown films prepared for glycerol contents varying from 15 to 25 wt% are then studied for a wide range of relative humidity. The determination of the water sorption isotherms and their modeling by Park's equation as well as the study of the water sorption kinetics parameters allow discussing the sorption mechanisms as a function of the respective plasticizing effect of glycerol and water, on one hand and of the ability of water molecules to form clusters within the material, on the other hand. The decrease of the glass transition temperature values of the films as a function of increasing water content is analyzed thanks to Gordon-Taylor equation and it is related to the respective plasticizing role of glycerol and water, as evidenced from water sorption analysis.
European polymer …, 2007
Composite materials are usually reinforced by synthetic fibers as carbon, glass etc.. .. Because ... more Composite materials are usually reinforced by synthetic fibers as carbon, glass etc.. .. Because of their good mechanical properties and low density, natural fibers are being considered more preferentially as reinforcement. The application of natural fibers as reinforcements in composite materials requires a strong adhesion between the fiber and the matrix. The poor resistance towards water absorption is one of the drawbacks of natural fibers which makes it more important to understand the dynamic properties of penetration of water molecules through these heterogeneous materials. Water vapour sorption kinetics in natural flax fibers have been performed at 25°C by using an electronic microbalance (IGA, Hiden). By using the Fickian model for a complete cylinder water diffusion coefficients have been determined and calculated at short times (first half-sorption) and long times (second half-sorption) of kinetic curve and for different water activities. The values obtained for D 1 and D 2 are rather similar on the all range of water activity. Generally, water diffusivity increases and then decreases with water activity. The increase of diffusivity at low water activities may be explained on the basis of the dual mode sorption (Langmuir and Henry sorption's combination) whereas the decrease for the higher activities can be attributed to the immobilization of sorbed water molecules due to the water clustering.