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2009 | 7 | 3 | 461-467
Tytuł artykułu

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

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The 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. [...]
Wydawca

Czasopismo
Rocznik
Tom
7
Numer
3
Strony
461-467
Opis fizyczny
Daty
wydano
2009-09-01
online
2009-06-21
Twórcy
  • NATEL Laboratory, Campus of Sorocaba, São Paulo State University — UNESP, 18087-180, Sorocaba, Brazil, malu@sorocaba.unesp.br
  • Electron Microscopy Laboratory, Institute of Physics, University of São Paulo, São Paulo, Brazil
  • Department of Metallurgical and Materials Engineering, Polytechnic School, University of São Paulo, São Paulo, Brazil
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-009-0038-7
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