Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente

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...

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Principais autores: Sales, Luciano Leal de Morais, Souza, Antonio Gouveia de, Soledade, Luiz Edmundo Bastos, Santos, Ieda Maria Garcia dos, Rodrigues Neto, João Batista, Silva, Elson Longo da, Paskocimas, Carlos Alberto
Formato: article
Idioma:pt_BR
Publicado em: Sociedade Brasileira de Química
Assuntos:
PH
Polymethylmethacrylate
Alumina
Endereço do item:https://repositorio.ufrn.br/handle/123456789/32213
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spelling ri-123456789-322132021-04-18T09:05:49Z Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente Influence of pH on the stability of alumina suspensions electrosterically stabilized Sales, Luciano Leal de Morais Souza, Antonio Gouveia de Soledade, Luiz Edmundo Bastos Santos, Ieda Maria Garcia dos Rodrigues Neto, João Batista Silva, Elson Longo da Paskocimas, Carlos Alberto PH Polymethylmethacrylate Alumina 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 2021-04-14T21:01:19Z 2021-04-14T21:01:19Z 2006-08-22 article SALES, Luciano Leal de Morais; SOUZA, Antonio Gouveia de; SOLEDADE, Luis Edmundo Bastos; SANTOS, Iêda Maria Garcia dos; RODRIGUES NETO, João Batista; LONGO, Elson; PASKOCIMAS, Carlos Alberto. Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente. Química Nova, [S.L.], v. 30, n. 1, p. 70-74, fev. 2007. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000100016&lng=pt&nrm=iso&tlng=pt. Acesso em: 09 mar. 2021. http://dx.doi.org/10.1590/s0100-40422007000100016. 10.1590/s0100-40422007000100016 0100-4042 1678-7064 https://repositorio.ufrn.br/handle/123456789/32213 pt_BR Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf Sociedade Brasileira de Química
institution Repositório Institucional
collection RI - UFRN
language pt_BR
topic PH
Polymethylmethacrylate
Alumina
spellingShingle PH
Polymethylmethacrylate
Alumina
Sales, Luciano Leal de Morais
Souza, Antonio Gouveia de
Soledade, Luiz Edmundo Bastos
Santos, Ieda Maria Garcia dos
Rodrigues Neto, João Batista
Silva, Elson Longo da
Paskocimas, Carlos Alberto
Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente
description 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
format article
author Sales, Luciano Leal de Morais
Souza, Antonio Gouveia de
Soledade, Luiz Edmundo Bastos
Santos, Ieda Maria Garcia dos
Rodrigues Neto, João Batista
Silva, Elson Longo da
Paskocimas, Carlos Alberto
author_facet Sales, Luciano Leal de Morais
Souza, Antonio Gouveia de
Soledade, Luiz Edmundo Bastos
Santos, Ieda Maria Garcia dos
Rodrigues Neto, João Batista
Silva, Elson Longo da
Paskocimas, Carlos Alberto
author_sort Sales, Luciano Leal de Morais
title Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente
title_short Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente
title_full Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente
title_fullStr Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente
title_full_unstemmed Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente
title_sort influência do ph sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente
publisher Sociedade Brasileira de Química
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/32213
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