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Molecular orientation of methylene blue cations adsorbed on clay surfaces

Published online by Cambridge University Press:  09 July 2018

J . Bujdák*
Affiliation:
National InstituteforMaterialsScience, Namiki 1-1, Tsukuba, Ibaraki305-0044
N. Iyi
Affiliation:
National InstituteforMaterialsScience, Namiki 1-1, Tsukuba, Ibaraki305-0044
Y. Kaneko
Affiliation:
National InstituteforMaterialsScience, Namiki 1-1, Tsukuba, Ibaraki305-0044
R. Sasai
Affiliation:
ResearchCenter forAdvanced Waste and Emission Management (ResCWE), Nagoya University, Furo-cho, Chikusa-ku, Nagoya464-8603, Japan
*

Abstract

Cationic dye, methylene blue (MB), was intercalated into films of expandable clay minerals with low, moderate and high layer charges (saponite, montmorillonite and synthetic expandable mica-fluorohectorite, respectively) . Tilted orientation of the dye cations on the silicate surface was observed by polarized ultraviolet-visible (UV-Vis) transmission spectroscopy. The tilting angle of the dye cations increased with the formation of high-order H-aggregates that absorb light at 525 nm. These dye species were formed only on the surface of fluorohectorite, which has the highest layer charge, and exhibited dichroism. Models for the orientation of MB cations on a clay surface were proposed based on MB orientation models previously reported, and compared with the basal spacings determined by X-ray diffraction.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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