Effect of valeric acid on the agglomeration of zirconia particles and effects of the sintering temperature on the strut wall thickness of particle-stabilized foam |
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| Affiliation: | 1. Engineering Ceramic Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam, 642-831, Republic of Korea;2. University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 305-350, Republic of Korea;1. Department of Materials Science & Engineering, Hongik University, Seoul 121-791, Republic of Korea;2. Thin Film Materials Research Group, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea;3. Department of Physics and Astronomy, Northwestern University, IL 60208, USA;4. Department of Mechanical and System Design Engineering, Hongik University, Seoul 121-791, Republic of Korea;1. Laboratório de Pesquisa em Farmacologia Bioquímica, CCQFA - Universidade Federal de Pelotas, UFPel, Pelotas, RS, Brazil;2. Laboratório de Síntese Orgânica Limpa, CCQFA - Universidade Federal de Pelotas - UFPel, Pelotas, RS, Brazil;1. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, Belgium;2. KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven & Dentistry, University Hospitals Leuven, Belgium;3. UMR CNRS 5510 (MATEIS), National Institute of Applied Sciences, INSA de Lyon, France;1. Engineering Ceramic Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 642-831, Republic of Korea;2. University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon 305-350, Republic of Korea |
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| Abstract: | Highly porous zirconia ceramics were prepared utilizing a particle-stabilized direct foaming technique in which the hydrophilic characteristic of zirconia particles was altered by the in situ adsorption of valeric acid on its surface. These surface modified zirconia particles are irreversibility adsorbed at the air/water interface and create an armor coating around the bubbles to stabilize them. In this study, the foamability and stability of zirconia foam were investigated by varying the valeric acid concentration, and zirconia foam with a foam volume of approximately four times the colloidal system volume was successfully prepared. The sintered foam has cell size ranging from 50 to 150 μm and the pore structure was characterized by mercury porosimetry. The effects of the sintering temperature on the grain size, strut wall thickness, and tetragonal phase were studied and correlated with an increase in the mechanical strength to 3.5 MPa with porosity of more than 90%. |
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| Keywords: | Particle-stabilized foams Porous ceramics Zirconia foam Colloidal chemistry |
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