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A micromorphological study on natural and folded sepiolite

Mercedes Suarez, Juan Morales, Almudena Torres-Pardo and Emilia Garcia-Romero
A micromorphological study on natural and folded sepiolite
European Journal of Mineralogy (February 2015) 27 (1): 81-90

Abstract

A sepiolite from Grant County (USA) was studied with two objectives. First, from a purely methodological perspective, a comparative micromorphological study was conducted using two imaging techniques: high-resolution transmission electron microscopy (HR-TEM) and atomic-force microscopy (AFM). The second objective was to determine whether the structural change that occurred in sepiolite after heating over 500 degrees C induced observable morphological changes. The fibrous morphology of sepiolite was observed; furthermore, bundles and rods were observed in both the TEM and AFM imagery. However, individual laths were easily observed by TEM but could only be deduced from the irregularities of the rod surfaces by AFM. A good approximation of the lath widths ( approximately 21 nm) can be obtained from measurements using the two techniques, but AFM allows for the determination of the height of the rods ( approximately 31 nm) and shows that the mesocrystals are tabular. The folding of the structure after heating was followed by XRD and HR-TEM. The precise measurements performed by HR-TEM and AFM on the folded sepiolite show the micromorphological change in the particles, which decrease in width after folding (from approximately 21 nm to approximately 18 nm) in accord with the reduction of the unit cell.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 27
Serial Issue: 1
Title: A micromorphological study on natural and folded sepiolite
Affiliation: Universidad de Salamanca, Departamento de Geologia, Salamanca, Spain
Pages: 81-90
Published: 201502
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 25
Accession Number: 2015-067757
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N31°46'60" - N33°12'00", W109°02'60" - W107°37'00"
Secondary Affiliation: Karlsruhe Institute of Technology, Institute for Photon Science and Synchrotron Radiation, DEU, GermanyUniversidad Complutense de Madrid, Departamento de Quimica Inorganica, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201529
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