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Molecular orientation of methylene blue intercalated in layer-charge-controlled montmorillonites

Published online by Cambridge University Press:  31 January 2011

Yoshiro Kaneko ,
Nobuo Iyi ,
Juraj Bujdák ,
Ryo Sasai  and
Takektoshi Fujita
Yoshiro Kaneko
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
Nobuo Iyi*
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
Juraj Bujdák
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, SK-845 36, Slovak Republic
Ryo Sasai
Affiliation:
Research Center for Advanced Waste and Emission Management, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Takektoshi Fujita
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
*
a)Address all correspondence to this author. e-mail: iyi.nobuo@nims.go.jp
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Abstract

The effect of the layer-charge density of clay on the orientation and aggregation of a cationic dye, methylene blue (MB), in MB/clay films was investigated using a series of layer-charge-controlled montmorillonites as host materials. Polarized ultraviolet-visible spectroscopy and x-ray diffraction were used for the characterization of the arrangement and orientation of dye cations in host interlayer spaces. It was revealed that high charge densities of layers induced the formation of relatively ordered and homogeneous phases with dye dimers. The reduction of the charge led to the formation of disordered, mixed phases with large amounts of monomers (isolated dye cations). Dimers and monomers were slightly tilted against the plane of the clay surface, and their angles were not affected by the layer charge.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2639 - 2643
Copyright
Copyright © Materials Research Society 2003

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