Shaping of alumina microbeads by drop-casting of the photopolymerizable suspension into silicone oil and UV curing |
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| Affiliation: | 1. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, Henan, China;2. Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China;3. Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 5018055, Guangdong, China;4. Department of Chemistry and Chemical Biology, Rutgers University, Piscataway 08854, NJ, United States;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Key Scientific Research Base of Ancient Ceramics (Shanghai Institute of Ceramics, Chinese Academy of Sciences), State Administration for Cultural Heritage, Shanghai 201899, China;3. Key Laboratory of the Comprehensive Analysis Technology for Ancient Ceramics and its Application (Shanghai Institute of Ceramics, Chinese Academy of Sciences), Ministry of Culture and Tourism, Shanghai 201899, China;4. Jiangxi Provincial Institute of Cultural Relics and Archaeology, Nanchang 330008, China;5. Ji′an Academy of Jizhou Porcelain Kiln Firing Technology, Ji′an 343000, China;6. Jingdezhen Ceramic University, Jingdezhen 333403, China;1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK), 52425 Jülich, Germany;2. University of Twente, Faculty of Science and Technology, Inorganic Membranes, P.O. Box 217, 7500 AE Enschede, the Netherlands;3. Chair of Energy Engineering Materials, RWTH Aachen University, 52056 Aachen, Germany;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The alumina microbeads were obtained by forming the drops of alumina suspensions in a silicone oil followed by UV curing. Due to the strong hydrophobic properties, silicon oil is a non-solvent (non-miscible) to the suspensions, thus the formation of perfectly rounded beads occurs spontaneously. The size of beads was controlled by a selection of a needle diameter and the position of needle tip: above or immersed in silicone oil. Thanks to that it was possible to obtain beads with diameters from 1000 to 1300 µm. The obtained alumina microbeads were characterized by quite a narrow size distribution, the differences in the size of the beads, within one series, did not exceed 1.5%. The research showed that the higher alumina volume fraction in suspensions favors the development of microstructure and thus influences mechanical properties. It was proved that the application of the methyl silicone oil as the environment responsible for the formation of the beads does not affect the sintering process. |
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| Keywords: | Alumina beads UV curing Dispersant Circularity |
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