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

• Authors: Maria Antunes , Helena Santos , Persio Santos
• Languages of publication: EN

Abstracts

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. [...]

Keywords

EN

Aluminium hydroxide; Crystal growth; Electron microscopy; Nordstrandite

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 3
• Pages: 461-467

Dates

published

1 - 9 - 2009

online

21 - 6 - 2009

Contributors

author

Maria Antunes

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

author

Helena Santos

• Electron Microscopy Laboratory, Institute of Physics, University of São Paulo, São Paulo, Brazil

author

Persio Santos

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

References

• [1] H. Saafeld, M. Wedde, Z. Kristallogr. 139, 129 (1974) [Crossref]
• [2] P. H. Hsu, in: J.B. Dixon, S.B. Weed (Eds.), Minerals in Soil Environments (Soil Science Society of America, Madison, 1989)
• [3] H. Souza Santos, P.K. Kiyohara, P. Souza Santos, J. Mat. Sci Letters 19, 1525 (2000) http://dx.doi.org/10.1023/A:1006708602621[Crossref]
• [4] R. Rothbauer, F. Zigan, H. O’Daniel, Z. Kristallogr. 125, 317 (1967) http://dx.doi.org/10.1524/zkri.1967.125.125.317[Crossref]
• [5] J.H.L. Watson, J. Parsons, A. Vallejo-Freire, P. Souza Santos, Kolloid Z. 140, 102 (1955) http://dx.doi.org/10.1007/BF01510493[Crossref]
• [6] R. Schoen, C.E. Roberson, Amer. Miner. 55, 43 (1970)
• [7] R. Van Nordstrand, W.P. Hettinger, C.D. Keith, Nature 177, 713 (1956) http://dx.doi.org/10.1038/177713a0[Crossref]
• [8] H.J. Bosmans, Acta Crystallogr. B 26, 649 (1970) http://dx.doi.org/10.1107/S0567740870002911[Crossref]
• [9] A. Violante, P. Violante, Clays Clay Min. 28, 425 (1980) http://dx.doi.org/10.1346/CCMN.1980.0280604[Crossref]
• [10] R.C. Mackenzie, E.A.C. Follett, R. Meldau, in: J.A. Gard (Ed.), The Electron-Optical Investigation of Clays (Mineralogical Society, London, 1971)
• [11] W.H. Gitzen, Alumina as a Ceramic Society (American Ceramic Society, Columbus 1970)
• [12] L.L. Musselman, in: L.D. Hart (Ed.), Alumina Chemicals (American Ceramic Society, Westerville, 1990)
• [13] P. Violante, A. Violante, J.M. Tait, Clays and Clay Miner. 30, 431 (1982) http://dx.doi.org/10.1346/CCMN.1982.0300605[Crossref]
• [14] A. Violante, P.M. Huang, Clays and Clay Miner. 33, 181 (1985) http://dx.doi.org/10.1346/CCMN.1985.0330303[Crossref]
• [15] R.I. Barnhisel, C.I. Rich, Soil. Sci. Soc. Amer. 29, 531 (1965) [Crossref]
• [16] K.P. Prodromou, A.S. Pavlatou-Ve, Clays Clay Miner. 43, 111 (1995) http://dx.doi.org/10.1346/CCMN.1995.0430113[Crossref]
• [17] P. Adamo, M. Pigna, S. Vingiani, A. Violante, Clay Clay Min. 51, 350 (2003) http://dx.doi.org/10.1346/CCMN.2003.0510312[Crossref]
• [18] M.L.P. Antunes, H. Souza Santos, P. Souza Santos, Materials Chem. Phys. 76, 243 (2002) http://dx.doi.org/10.1016/S0254-0584(01)00535-1[Crossref]
• [19] D. Aldcroft, G.C. Bye, in: G.P. Stewart (Ed.), Science of Ceramics (Academic Press, London, 1967) vol. 3
• [20] V.A. Lipin, Russian J. Appl. Chem. 74, 184 (2001) (In Russian) http://dx.doi.org/10.1023/A:1012749428765[Crossref]
• [21] O.P. Krivoruchko, R.A. Buyanov, M.A.S. Fedotorov, L.M. Plyasova, Russian J. Inorg. Chem. 23, 988 (1978) (In Russian)
• [22] P. Souza Santos, P.K. Kiyohara, H. Souza Santos, Bol. Tecn. Petrobrás 41 (1998)

Identifiers

DOI

10.2478/s11532-009-0038-7