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Publikācija: Development of Biomorphic Cellular Ceramic Using Illite Clay

Publication Type Conference paper
Funding for basic activity Research project
Defending: ,
Publication language English (en)
Title in original language Development of Biomorphic Cellular Ceramic Using Illite Clay
Field of research 2. Engineering and technology
Sub-field of research 2.4 Chemical engineering
Authors Mārtiņš Randers
Gaida Maruta Sedmale
Līga Grase
Aija Krūmiņa
Keywords Biomorphic ceramic, illite clay
Abstract Biomorphic mineralization is process by which new materials are obtained using natural templates in combination with synthetic compounds. There are few studies that focus on use of illite clay to produce biomorphic products. This study investigates possibility of producing biomorphic ceramics by deposition illite clay nanoparticles on natural templates - wood, moss, lichen and cotton fibers. Source of illite was quartenary clays in western of Latvia. Deposition of illite clay nanoparticles was done by immersing chosen natural templates in water - illite slurries. Infiltrated samples were dried and sintered in air or nitrogen at temperatures 800°C, 900°C, 1000°C. Morphology and phases boundary was analysed using SEM (Hitachi TM 3000 and NovaNano SEM 650 Netherlands.), phase composition - by XRD (model D8 Advance Bruker). FTIR was also used to determine chemical bonding. It is shown that moss and lichen templates sintered in air well retain the templates morphology. Sinthesized biomorphic ceramics is weak, but have sufficient strength and may be characterized by the bulk densities up to 0.7g/cm3 for moss template and up to 0.5 g/cm3 for lichen template. Compressive strength for both templates is less than 1 MPa. XRD analysis shows crystalline phases formed as clay transformation products, and it are quartz, Ca-Na plagioclase, orthoclase and hematite. Illite phase disappears at temperature 1000°C. Presence of hematite assigns red-brown color to these samples. In nitrogen synthesized samples are black and also keeps morphology of templates, but are delicate. These biomorphic ceramics after sintering at the same temperatures is formed from the same crystalline phases as in air sintered, but illite phase disappears already at temperature 800ᵒC. For both cases there are presence also glassy phase.
Reference Randers, M., Sedmale, G., Grase, L., Krūmiņa, A. Development of Biomorphic Cellular Ceramic Using Illite Clay. In: BaltSilica 2018 : Book of Abstracts of the 8th International Conference on Silicate Materials, Latvia, Rīga, 30 May - 1 June, 2018. Riga: RTU Publishing House, 2018, pp.64. ISSN 2243-6057.
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