Crystallization of nordstrandite in ethylene glycol / water solutions: electron microscopic studies-Reference-Cited by-同舟云学术

Crystallization of nordstrandite in ethylene glycol / water solutions: electron microscopic studies

Published:2009-09-01 Issue:3 Volume:7 Page:461-467
ISSN:2391-5420
Container-title:Open Chemistry
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Author:

Antunes Maria¹,Santos Helena²,Santos Persio³

Affiliation:

1. 1NATEL Laboratory, Campus of Sorocaba, São Paulo State University — UNESP, 18087-180, Sorocaba, Brazil

2. 2Electron Microscopy Laboratory, Institute of Physics, University of São Paulo, São Paulo, Brazil

3. 3Department of Metallurgical and Materials Engineering, Polytechnic School, University of São Paulo, São Paulo, Brazil

Abstract

AbstractThe present work shows the growth of nordstrandite microcrystals observed by transmission and scanning electron microscopy. Nordstrandite was synthesised from non-crystalline aluminium hydroxide reacted in 20% ethylene glycol/water solution, at room temperature. This material was characterized by TEM, SEM, SAED, XRD and EDS/TEM, during six month and revealed the formation and growth of nordstrandite. Fibrillar pseudoboehmite is the only aluminium hydroxide which could be identified during the first two weeks. The nuclei grow, from complete dissolution/recrystallization of pseudoboehmite fibrils, into platy rectangular microscrystals of nordstrandite. Some tabular microcrystals recrystallise, forming after six months only the multi-point nordstrandite stars. This electron-optical study suggest that the star shape results from the overlapping of rectangular plates, and pseudoboehmite fibrils act as the precursor of nordstrandite crystallisation in ethylene glycol/water solution.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,General Chemistry

Link

http://link.springer.com/content/pdf/10.2478/s11532-009-0038-7.pdf

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