Synthesis,microhardness, fracture toughness and microstructural features of chitosan containing alkali activated geopolymers |
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| Affiliation: | 1. University of Udine, Polytechnic Department of Engineering and Architecture, Via Del Cotonificio 108, 33100, Udine, Italy;2. FREUD Spa, Via Remigio Solari 7, 33050, Pavia di Udine, UD, Italy;1. Technical University of Košice, Faculty of Materials, Metallurgy and Recycling, Institute of Metallurgy, Letná 9, 042 02, Košice, Slovakia;2. Institute of Materials Research - Slovak Academy of Sciences, Watsonova 47, 040 01, Košice, Slovakia;3. KERAG, s.r.o, Košice, Slovakia;1. School of Mechanical Engineering, Shandong University of Technology, Zibo, 255000, China;2. School of Materials Science and Engineering, Shandong University of Technology, Zibo, 255000, China;3. Institute of Additive Manufacturing, Shandong University of Technology, Zibo, 255000, China;4. Shandong Industrial Ceramics Research & Design Institute Co., Ltd., Zibo, 255000, China;5. School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255000, China;1. School of Intelligent Manufacturing, Chengdu Technological University, Chengdu, 610031, China;2. College of Mechanical Engineering & Graduate School, Chiba University, Chiba, 262-8522, Japan;3. Tokyo Metropolitan College of Industrial Technology, Tokyo, 116-8523, Japan;4. Chiba Industrial Technology Research Institute, Chiba, 264-0017, Japan;1. Key Laboratory of New Energy Development and Energy Storage Technology of Handan, College of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, People''s Republic of China;2. Hebei Gellec New Energy Science&Technology Co.,Ltd, Handan, 057150, People''s Republic of China;1. Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Unità di Ricerca del Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Università degli Studi di Cagliari, 09123, Cagliari, Italy;2. Dipartimento di Scienze Chimiche, Fisiche, Matematiche e Naturali, Università degli Studi di Sassari, 07100, Sassari, Italy;3. Dipartimento di Fisica, Università degli Studi di Cagliari, 09042, Monserrato, Cagliari, Italy;4. Department of Physics and Astronomy, University of Notre Dame, Notre Dame, 46556, IN, United States |
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| Abstract: | In this work, geopolymer matrix samples containing different amounts of chitosan, specifically 1, 3, 5 and 10 wt%, were produced to study the effect of a ductile phase within a much more brittle one.The reference geopolymer was produced mixing a commercial metakaolin with sodium silicate solution and sodium hydroxide solution. Geopolymeric slurries were caste into mold and hardened by a thermal treatment at 70 °C and then at ambient temperature for 28 days. Hardened materials, containing different amount of chitosan, were examined by mean of X-ray diffraction, Fourier Transform Infrared Radiation, Scanning Electron Microscope investigation. Microhardness and fracture toughness were measured to study the effects on the samples chemistry and microstructure caused by the introduction of chitosan into the geopolymer. It has been observed that the addition of chitosan lowers materials porosity and microhardness, but slightly improves their fracture toughness. |
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| Keywords: | Geopolymers Chitosan Water absorption Microhardness Fracture toughness Microstructure |
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