DI-UMONS : Dépôt institutionnel de l’université de Mons

Recherche transversale
(titres de publication, de périodique et noms de colloque inclus)
2013-01-29 - Colloque/Présentation - poster - Anglais - 1 page(s)

Sciamanna Valérie , Nait-Ali Benoît, Gonon Maurice , "Characterization of macroporous ceramics produced from stable foams and emulsions" in Fifth International Conference on Shaping of Advanced Materials, Mons, Belgium, 2013

  • Codes CREF : Matériaux céramiques et poudres (DI2744)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) In this work, macroporous ceramics are produced from particle-stabilized wet foams and emulsions, following the procedures defined by Gonzenbach et al. [1] and Akartuna et al. [2]. Foams and emulsions are obtained from aqueous alumina suspensions containing butyric acid. Butyric acid is incorporated in the suspensions in order to hydrophobize alumina particles, leading to their adsorption at the air/water or oil/water interface. Octane is used for the preparation of emulsions. Air and oil bubbles are incorporated in the suspension through energetic stirring. After setting and drying, wet foams and emulsions are sintered at 1585°C. This study focus on the characterization of the resulting porous samples. Microstructures of sintered alumina foams and emulsions reveal closed pores surrounded by a thin alumina layer. The microstructure of these macroporous ceramics is related with the composition of the initial suspension (alumina content and butyric acid concentration). Aqueous alumina suspensions (solid contents of 20 vol%, 40 vol% and 50 vol%) with butyric acid concentrations up to 125 mmol/l were studied. 50 vol% alumina suspensions with optimized butyric acid concentration lead to smaller pores and narrower pore size distribution. The specific surface of porous samples is obtained by BET method. Thermal diffusivity measurements were made with the laser flash technique in order to determine the effective thermal conductivity. Mechanical properties of macroporous ceramics were also investigated. [1] Gonzenbach U.T., Studart A.R., Tervoort E., Gauckler L.J., "Macroporous Ceramics from Particle-Stabilized Wet Foams", J. Am. Ceram. Soc., 90 [1], 2007, pp. 16-22 [2] Akartuna I., Studart A.R., Tervoort E., Gauckler L.J., "Macroporous Ceramics from Particle-Stabilized Emulsions", Advanced Materials, 20, 2008, pp. 4714-4718