Spectral properties of rhodamine 3B adsorbed on the surface of montmorillonites with variable layer charge

Montmorillonite was thermally treated at several temperatures to reduce the charge density of its layer surface. Absorption and fluorescence (steady-state and time-resolved) spectroscopies are now applied to study the adsorption of rhodamine 3B (R3B) laser dye in reduced charge montmorillonites (RCM...

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Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 23(2007), 4 vom: 13. Feb., Seite 1851-9
1. Verfasser: Bujdak, Juraj (VerfasserIn)
Weitere Verfasser: Martínez, Virginia Martínez, Arbeloa, Fernando López, Iyi, Nobuo
Format: Aufsatz
Sprache:English
Veröffentlicht: 2007
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article
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245 1 0 |a Spectral properties of rhodamine 3B adsorbed on the surface of montmorillonites with variable layer charge 
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520 |a Montmorillonite was thermally treated at several temperatures to reduce the charge density of its layer surface. Absorption and fluorescence (steady-state and time-resolved) spectroscopies are now applied to study the adsorption of rhodamine 3B (R3B) laser dye in reduced charge montmorillonites (RCMs) in aqueous suspensions. The decrease in the charge density increases the intermolecular distance between adsorbed R3B molecules, reducing the tendency of the dye to self-associate. H-type and J-type aggregates of R3B in RCMs are spectroscopically characterized, the fluorescent J-aggregates being more extensively formed by decreasing the charge density. Both the reduction in the dye aggregation and the formation of J-type aggregates enhance the fluorescence efficiency of R3B dye adsorbed in montmorillonite particles. Absorption with linearly polarized light reveals that the H-aggregates are more disposed toward the perpendicular of the clay surface than the monomer and J-aggregates species 
650 4 |a Journal Article 
700 1 |a Martínez, Virginia Martínez  |e verfasserin  |4 aut 
700 1 |a Arbeloa, Fernando López  |e verfasserin  |4 aut 
700 1 |a Iyi, Nobuo  |e verfasserin  |4 aut 
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