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

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

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dc.contributor.author	Sales, Luciano Leal de Morais
dc.contributor.author	Souza, Antonio Gouveia de
dc.contributor.author	Soledade, Luiz Edmundo Bastos
dc.contributor.author	Santos, Ieda Maria Garcia dos
dc.contributor.author	Rodrigues Neto, João Batista
dc.contributor.author	Silva, Elson Longo da
dc.contributor.author	Paskocimas, Carlos Alberto
dc.date.accessioned	2021-04-14T21:01:19Z
dc.date.available	2021-04-14T21:01:19Z
dc.date.issued	2006-08-22
dc.description.resumo	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	pt_BR
dc.identifier.citation	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.	pt_BR
dc.identifier.issn	10.1590/s0100-40422007000100016
dc.identifier.issn	0100-4042
dc.identifier.issn	1678-7064
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32213
dc.language	pt_BR	pt_BR
dc.publisher	Sociedade Brasileira de Química	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	PH	pt_BR
dc.subject	Polymethylmethacrylate	pt_BR
dc.subject	Alumina	pt_BR
dc.title	Influência do pH sobre a estabilidade de suspensões de alumina estabilizadas eletroestericamente	pt_BR
dc.title.alternative	Influence of pH on the stability of alumina suspensions electrosterically stabilized	pt_BR
dc.type	article	pt_BR