| Agglomeration of alumina submicronparticles by silica nanoparticles: application to processing spheres by colloidal route. | |
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MedLine Citation:
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PMID: 17524415 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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In aqueous media, heterocoagulation between submicronic alumina (400 nm) and nanometric silica (25 nm) leads to the adsorption of silica on the alumina surface. By controlling the coverage rate of alumina particles, this adsorption destabilizes the suspension that leads to a very porous network of agglomerated particles. This work shows that the structure is all the more open as the density of charge carried by the two oxides is high and the ionic strength in the suspension low. From such a flocculated suspension, a new colloidal process to fabricate ceramic spheres is proposed which is based on a size increase of agglomerates. Under a controlled rotation of the vessel, electrostatic attraction between the surface charges of opposite polarity induces a size increase of agglomerates until the formation of spheres occurs. It has been shown that the mechanism of growth is poisoned by species adsorbed such as ions. Nevertheless, this new process proves very promising because it leads to a narrow size distribution of spheres by colloidal way, which can be subsequently consolidated by sintering, with a smooth surface. |
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Authors:
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P Garcia-Perez; C Pagnoux; A Pringuet; A Videcoq; J F Baumard |
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Publication Detail:
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Type: Journal Article Date: 2007-05-04 |
Journal Detail:
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Title: Journal of colloid and interface science Volume: 313 ISSN: 0021-9797 ISO Abbreviation: J Colloid Interface Sci Publication Date: 2007 Sep |
Date Detail:
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Created Date: 2007-08-06 Completed Date: 2007-10-12 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: United States |
Other Details:
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Languages: eng Pagination: 527-36 Citation Subset: - |
Affiliation:
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SPCTS UMR 6638, ENSCI, 47 avenue Albert Thomas, 87065 Limoges Cedex, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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