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Alumina

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Encyclopedia of Polymeric Nanomaterials

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Synonyms

Aluminum oxide; Al2O3

Definition

Alumina is the name used to describe the various oxide compounds formed by aluminum in its trivalent state.

Nanoscale Alumina in the Solid State

There are numerous polymorphs of alumina which could conceivably be described as being polymeric nanomaterials; the many possible arrangements of Al3+-centered octahedra in anhydrous and hydrous forms give rise to a diversity of stable and metastable (“transition”) aluminas. In a technological sense, the most important are the stable α-alumina (corundum) and the metastable γ-alumina. Synthesis of nanosized alumina most often leads to the γ-phase, which is then either sintered to the α-phase or utilized directly [1]. The γ-Al2O3 phase is a defect spinel-type structure, usually cubic [2], although tetragonal distortion is observed in materials obtained by calcination of hydroxide precursors [3]. Aluminum is present in γ-Al2O3in both tetrahedral and octahedral coordination environments, while the...

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Author information

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Sheffield, Mappin St, S1 3JD, Sheffield, UK

    John L. Provis

Authors
  1. John L. Provis
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Correspondence to John L. Provis .

Editor information

Editors and Affiliations

  1. Center for Fiber and Textile Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan

    Shiro Kobayashi

  2. Max Planck Institute for Polymer Research, Mainz, Germany

    Klaus Müllen

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Provis, J.L. (2015). Alumina. In: Kobayashi, S., Müllen, K. (eds) Encyclopedia of Polymeric Nanomaterials. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29648-2_408

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