Characterization of microbial communities associated with ceramic raw materials as potential contributors for the improvement of ceramic rheological properties

作者: Angela M. Garcia-Sanchez , Bernardino Machado-Moreira , Mário Freire , Ricardo Santos , Sílvia Monteiro

DOI: 10.3390/MIN9050316

关键词: SphingomonasPulp and paper industryBiocideExtracellular polymeric substancePenicillium citrinumRaw materialSpray dryingCeramicBacillus altitudinisChemistry

摘要: Technical ceramics are being widely employed in the electric power, medical and engineering industries because of their thermal mechanical properties, as well high resistance qualities. The manufacture technical ceramic components involves complex processes, including milling stirring raw materials aqueous solutions, spray drying dry pressing. In general, spray-dried powders exhibit an important degree variability performance when subjected to dry-pressing, which affects efficiency manufacturing process. Commercial additives, such deflocculants, biocides, antifoam agents, binders, lubricants plasticizers thus applied slips. Several bacterial fungal species naturally occurring materials, Sphingomonas, Aspergillus Aureobasidium, known produce exopolysaccharides. These extracellular polymeric substances (EPS) may confer unique potentially interesting properties on slips, viscosity control, gelation, flocculation. this study, microbial communities present clay were identified by both culture methods DNA-based analyses select potential EPS producers based scientific literature for further assays use enhancing ceramics. Potential exopolysaccharide all samples, Sphingomonas sp., Pseudomonas xanthomarina, P. stutzeri, koreensis, Acinetobacter lwoffi, Bacillus altitudinis Micrococcus luteus, among bacteria. Five fungi (Penicillium citrinum, niger, Fusarium oxysporum, Acremonium persicinum Rhodotorula mucilaginosa) also producers.

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