| Journal: | Quimica nova |
| Database: | PERIÓDICA |
| System number: | 000313432 |
| ISSN: | 0100-4042 |
| Authors: | Sales, Luciano Leal de Morais1 Souza, Antonio Gouveia de Soledade, Luis Edmundo Bastos Santos, Ieda Maria Garcia dos Rodrigues-Neto, Joao Batista2 Longo, Elson3 Paskocimas, Carlos Alberto4 |
| Institutions: | 1Universidade Federal da Paraiba, Departamento de Quimica, Joao Pessoa, Paraiba. Brasil 2Servico Nacional de Aprendizagem Industrial, Tijucas, Santa Catarina. Brasil 3Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Quimica, Araraquara, Sao Paulo. Brasil 4Universidade Federal do Rio Grande do Norte, Departamento de Engenharia Mecanica, Natal, Rio Grande do Norte. Brasil |
| Year: | 2007 |
| Season: | Feb |
| Volumen: | 30 |
| Number: | 1 |
| Pages: | 70-74 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | In this work, aqueous suspensions of aluminas with different particle sizes were evaluated. The effect of pH on the electrosteric stabilization using PMAA-NH4 (ammonium polymethacrylate) as deflocculant was studied. The amount of deflocculant was optimized and rheologic properties were determined at four different pH values. Sedimentation was also evaluated. For suspensions with pH 4, an electrostatic mechanism of stabilization was observed, probably due to a flat adsorption of PMMA- on the alumina surface, leading to a small efficiency in relation to steric stabilization. For a suspension with pH 12, the steric mechanism of stabilization prevails. Suspensions with pH 7 and 9 present a higher flocculation degree. In relation to particle size, A-1000 samples present a smaller particle size, leading to a smaller interparticle distance (IPS), making stabilization more difficult |
| Disciplines: | Química |
| Keyword: | Ingeniería química, Cerámica, Polimetilmetacrilato, Alúmina, pH |
| Keyword: | Chemistry, Chemical engineering, Ceramics, Polymethylmethacrylate, Alumina, pH |
| Full text: | Texto completo (Ver HTML) |
