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AFM Study of Smectites in Hybrid Langmuir-Blodgett Films: Saponite, Wyoming Bentonite, Hectorite, and Laponite

Published online by Cambridge University Press:  01 January 2024

Tamás Szabó ,
Jun Wang ,
Alexander Volodin ,
Chris van Haesendonck ,
Imre Dekany  and
Robert A. Schoonheydt
Tamás Szabó
Affiliation:
Centre for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium Department of Colloid Chemistry, University of Szeged, Aradi Vt 1, H-6720 Szeged, Hungary
Jun Wang
Affiliation:
Centre for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium Chemistry College, Huazhong Normal University, Wuhan, Hubei, China 430079
Alexander Volodin
Affiliation:
Department of Physics and Astronomy, K.U. Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
Chris van Haesendonck
Affiliation:
Department of Physics and Astronomy, K.U. Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
Imre Dekany
Affiliation:
Department of Colloid Chemistry, University of Szeged, Aradi Vt 1, H-6720 Szeged, Hungary
Robert A. Schoonheydt*
Affiliation:
Centre for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium
*
* E-mail address of corresponding author: Robert.schoonheydt@biw.kuleuven.be
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Abstract

The sizes and shapes of single clay mineral layers are difficult to determine though they are important parameters which determine the final properties of clay polymer nanocomposites and of ultrathin clay mineral films. To determine these sizes and shapes, hybrid monolayers of clay minerals (saponite, hectorite, Wyoming bentonite, and Laponite) and Rhodamine B octadecyl ester Perchlorate (RhB18) were prepared using the Langmuir-Blodgett (LB) technique and studied with atomic force microscopy (AFM). The AFM images reveal monolayers of elementary clay mineral layers, which are randomly oriented and have a wide range of sizes. The layers have typical shapes: lath-like for hectorite, plates for Wyoming bentonite, a mixture of laths and plates for saponite, and aggregates of very small layers of Laponite. Two types of layers were present in the LB films of saponite, Wyoming bentonite, and hectorite in a 40:60 ratio: (1) single layers 0.96 nm thick hybridized with RhB18; and (2) particles consisting of two clay layers with an intercalated monomolecular layer of water molecules and hybridized with RhB18. The Laponite particles in the hybrid LB films consist mainly of aggregates of two and three single layers.

Keywords

AFMHectoriteLaponiteSaponiteWyoming Bentonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 57 , Issue 6 , December 2009 , pp. 706 - 714
Copyright
Copyright © The Clay Minerals Society 2009

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