[en] Image analysis and impedance spectroscopy have been used as potential tools for the characterization of the texture of ultramacroporous PLA foams prepared by freeze-drying. It has been shown that these two techniques actually provide valuable information on the structure of this material. They are complementary to mercury porosimetry, which does not allow morphological details to be distinguished. Image analysis of SEM micrographs of transverse cross-sections at two different magnifications gave information on both the macroporosity (1 μm < width < 10 μm) and ultramacroporosity (width > 10 μm). Impedance spectroscopy was used to investigate the transport properties of the three-dimensional porous matrices by measurement of ionic conduction
Disciplines :
Physics Chemistry
Author, co-author :
Blacher, Silvia ; Université de Liège - ULiège > Département de Chimie appliquée > Chimie physique appliquée
Maquet, Véronique; Université de Liège - ULiège > CERM
Pirard, René ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Jérôme, Robert ; Université de Liège - ULiège > Centre d'études et de rech. sur les macromolécules (CERM)
Language :
English
Title :
Image analysis, impedance spectroscopy and mercury porosimetry characterisation of freeze-drying porous materials
Publication date :
2001
Journal title :
Colloids and Surfaces A: Physicochemical and Engineering Aspects