| Revista: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000198152 |
| ISSN: | 0100-4042 |
| Autors: | Gardolinski, Jose E1 Wypych, Fernando Cantao, Mauricio P |
| Institucions: | 1Universidade Federal do Parana, Departamento de Quimica, Curitiba, Parana. Brasil 2Laboratorio Central de Pesquisas e Desenvolvimento, Curitiba, Parana. Brasil |
| Any: | 2001 |
| Període: | Nov-Dic |
| Volum: | 24 |
| Número: | 6 |
| Paginació: | 761-767 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, descriptivo |
| Resumen en inglés | Well-ordered Georgia kaolinite (Kga-1b) obtained from the source Clay Repository of the Clay Minerals Society (USA) was intercalated with urea using grinding procedures. To achieve complete intercalation 20% of urea (in weight) was used, producing Al2Si2O5(OH)4 (N2H4CO)0,86 with an interplanar basal spacing of 1,08nm. After washing with water under ultrasound stirring at 363K, urea was completely removed and kaolinite was partially exfoliated. After drying under air, the material was converted to hydrated kaolinite with the composition Al2Si2O5(OH)4 (H2O)0,64 and an interplanar basal spacing of 0,84nm. In this compound, water molecules positioned between the layers of the silicate can be removed after calcination at 573K, regenerating structurally disordered kaolinite |
| Disciplines | Ingeniería |
| Paraules clau: | Ingeniería de materiales, Ingeniería de minas, Urea, Caolinita, Exfoliación, Hidratación, Arcillas, Materiales laminados, Silicatos, Aluminosilicatos |
| Keyword: | Engineering, Materials engineering, Mining engineering, Urea, Kaolinite, Exfoliation, Hydration, Clays, Layered materials, Silicates, Aluminosilicate |
| Text complet: | Texto completo (Ver HTML) |
