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The synthesis of aluminium hydroxide and oxyhydroxide
Includes bibliographical references.
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
Department of Civil Engineering
2014
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| _version_ | 1867613299468664833 |
|---|---|
| access_status_str | Open Access |
| author | Louw, Linda-Ann |
| author_browse | Louw, Linda-Ann |
| author_facet | Louw, Linda-Ann |
| author_sort | Louw, Linda-Ann |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/9564 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:55.830Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Civil Engineering |
| publisherStr | Department of Civil Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/9564 The synthesis of aluminium hydroxide and oxyhydroxide Louw, Linda-Ann Applied Science Includes bibliographical references. Beta alumina is a ceramic with the ability to conduct certain ions. It is conventionally formed through the high temperature solid state reaction of α-alumina with soda and lithia, which results in a mixture of β- and β"-alumina phases. To maximise the amount of β"-alumina formed, a second heat treatment step is required. Beta alumina may also be synthesised directly from the various aluminium hydroxide ( Al(OH)₃ ) and aluminium oxyhydroxide (AIOOH) polymorphs. The particular oxygen sublattice of the starting material is critical in determining which phases of beta alumina are formed. Boehmite and bayerite are known to yield pure β"-alumina. In this investigation, the differences in structure and the identification of the polymorphs is discussed. A review of the methods of synthesis and concomitant mechanisms of reaction proposed in the literature are presented. Of these, the synthesis of boehmite and bayerite are investigated experimentally. Attempts to synthesise boehmite at ambient conditions resulted in the formation of pseudoboehmite, and confirmed that boehmite can only be formed by the introduction of a hydrothermal step. However, it was possible to form bayerite at ambient conditions by sμnple chemical reaction. Control of the reaction pH and the removal of inhibiting ions were found to facilitate the formation of well crystallised bayerite. Although the factors governing the successful synthesis of bayerite need further investigation, the possibility of a direct synthesis route for β"-alumina has been demonstrated. Finally, the synthesis of β"-alumina by the solid state reaction of the hydroxide and oxyhydroxide polymorphs was successfully completed. 2014-11-11T20:06:06Z 2014-11-11T20:06:06Z 1993 Master Thesis Masters MSc http://hdl.handle.net/11427/9564 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Applied Science Louw, Linda-Ann The synthesis of aluminium hydroxide and oxyhydroxide |
| thesis_degree_str | Master's |
| title | The synthesis of aluminium hydroxide and oxyhydroxide |
| title_full | The synthesis of aluminium hydroxide and oxyhydroxide |
| title_fullStr | The synthesis of aluminium hydroxide and oxyhydroxide |
| title_full_unstemmed | The synthesis of aluminium hydroxide and oxyhydroxide |
| title_short | The synthesis of aluminium hydroxide and oxyhydroxide |
| title_sort | synthesis of aluminium hydroxide and oxyhydroxide |
| topic | Applied Science |
| url | http://hdl.handle.net/11427/9564 |
| work_keys_str_mv | AT louwlindaann thesynthesisofaluminiumhydroxideandoxyhydroxide AT louwlindaann synthesisofaluminiumhydroxideandoxyhydroxide |