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Key steps influencing the formation of aluminosilicate nanotubes by the fluoride route

Atika Chemmi, Jocelyne Brendle, Claire Marichal and Benedicte Lebeau
Key steps influencing the formation of aluminosilicate nanotubes by the fluoride route
Clays and Clay Minerals (April 2015) 63 (2): 132-143

Abstract

Imogolite is usually formed by means of a three-step process involving the use of large amounts of water with long crystallization times and low yields, preventing large-scale synthesis. These drawbacks can be overcome by synthesis in the presence of fluoride, an approach which has been demonstrated to be suitable for the synthesis of other phyllosilicates. In the present study, the nature of the Al and Si sources, the Al/Si molar ratio, the volume of H (sub 2) O for the redispersion of the gel after desalination, the F/Si molar ratio, as well as the crystallization temperature and time have been varied to investigate their role in the crystallization of imogolite. The structural properties of the as-synthesized samples were characterized by X-ray diffraction, infrared spectroscopy, and (super 29) Si, (super 27) Al, and (super 19) F magic angle spinning nuclear magnetic resonance spectroscopy. The results show that the imogolite nanotubes can be prepared with high yields (>55%) from AlCl (sub 3) .6H (sub 2) O and Na (sub 4) SiO (sub 4) aqueous solutions with an Al/Si molar ratio of 2.5, addition of HF for a F/Si molar ratio of 0.1-0.2, and 4 days of crystallization at 98 degrees C.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 63
Serial Issue: 2
Title: Key steps influencing the formation of aluminosilicate nanotubes by the fluoride route
Affiliation: Universite de Haute Alsace, Institut de Science des Materiaux de Mulhouse, Mulhouse, France
Pages: 132-143
Published: 201504
Text Language: English
Publisher: Clay Minerals Society, Chantilly, VA, United States
References: 51
Accession Number: 2016-001988
Categories: Mineralogy of silicatesSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201601
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