Gelcasting of alumina suspensions containing nanoparticles with glycerol monoacrylate |
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| Authors: | Carolina Tallon Dariusz Jach Rodrigo Moreno M Isabel Nieto Gabriel Rokicki Mikolaj Szafran |
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| Affiliation: | 1. Instituto de Ceramica y Vidrio, CSIC, Kelsen 5, Campus de Cantoblanco, 28049 Madrid, Spain;2. Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-64 Warsaw, Poland;1. Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China;2. Anhui Key Laboratory of Coal Clean Conversion and Utilization, School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, PR China;1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;2. Sinopec Henan Oilfield Service Corporation, Nanyang 473132, China |
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| Abstract: | An acrylic monomer of low toxicity containing two hydroxyl groups has been synthesized and used for gelcasting in water. The results have been compared to those achieved with the use of a commercially available monomer (2-hydroxyethyl acrylate). Due to the chemical structure of the synthesized monomer, no addition of the crosslinking agent was necessary for gelation and similar results in terms of rheology of suspensions, density and microstructure of the bodies were obtained with respect to those obtained with the commercial monomer. However, higher time for gelation was observed.Two alumina powders with very different particle sizes were used in this study: a commercial submicron-sized powder (d50 = 0.35 μm) and a nanometer-sized alumina obtained by freeze-drying from aluminum sulphate solutions. The rheological behavior of concentrated suspensions was studied in order to establish their stability and to analyse the effect of the different monomers used in the process. Once the suspensions were optimized, the influence of the size of the powder on the gelation process was studied. The sintered density of submicrometer-sized alumina was higher (99%) than that measured when the bimodal suspension was used due to the difficulty to obtain highly concentrated suspensions from nanometric powder. |
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