Adsorption of a water soluble cationic dye into a cationic Langmuir monolayer

Shil, Ashis; Hussain, Syed Arshad; Bhattacharjee, D.

doi:10.1016/j.jpcs.2015.01.005

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…19,22,23 When the Nb is dissolved in the subphase, the Nb molecules together with the clay sheets are both adsorbed by the CA Langmuir layer. Therefore, the LA of ternary layers becomes even larger (0.40 → 0.55 nm 2 ). As shown by the green, blue, and magenta profiles in Figure 1a, these three isotherms were obtained over clay dispersions dissolved with different amounts of Nb.…”

Section: Resultsmentioning

confidence: 99%

“…For example, molecular structures of the free states existing in solutions are totally different from those of adsorbed states at the interfaces between gases, liquids, and solids . The study of dye molecule configurations with respect to the electronic band structures is of great importance to understand the fundamental science as well as to develop new materials/devices in biomembranes, labeling-probes, opto(electro)-luminescent applications, and so on . Research is now focusing on the study of adsorbed molecules assembled in a film or integrated into a solid substrate because of their particular optical properties .…”

Section: Introductionmentioning

confidence: 99%

“…1 The study of dye molecule configurations with respect to the electronic band structures is of great importance to understand the fundamental science as well as to develop new materials/devices in biomembranes, labeling-probes, opto-(electro)-luminescent applications, and so on. 2 Research is now focusing on the study of adsorbed molecules assembled in a film or integrated into a solid substrate because of their particular optical properties. 3 A case in point was found in the cyanin molecules, which have been proven to have different spectral features corresponding to intriguing bands of photoabsorption.…”

Section: Introductionmentioning

confidence: 99%

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Spectral Inspections on Molecular Configurations of Nile Blue A Adsorbed on the Elementary Clay Sheets

Huang

Liu

et al. 2015

J. Phys. Chem. B

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Studies on the configuration of dye molecules are of great importance in revealing origins of the electronic bands as well as understanding their transitions. In this work, we utilized dye molecules named Nile blue A, which are a type of oxazine dyes, to study the molecular configurations when they are transferred from solutions to a solid surface. The Langmuir-Blodgett (LB) technique was employed to construct such an interface where the interaction between the dye molecules and solid supports can be pursued. Hybrid films were prepared via the LB depositions, and the dye molecules were assembled on the elementary clay sheets (laponite, saponite). The configuration of Nb reflected by the molecular orientation, packing density, phase behavior, and variances of the surface tension has been derived. The ex situ spectroscopy characterizations such as UV-vis absorption, fluorescence emission, and excitation spectra were carried out on these LB films to reveal the fact that the adsorbed Nb molecules are mainly assembled in two types of configurations. Adsorbed state I was found to be achieved at high concentrations (1-10 ppm) of clay dispersions and low surface pressure (∼5 mN/m). In this state the anionic oxazine rings of Nb are adsorbed on clay sheets sharing a large lift-off area. This configuration gives allowable fluorescence (λ = 550 nm). Lower clay concentration (<1 ppm) and high surface pressure (10-30 mN/m) yield the adsorbed state II in which the oxazine chromophores were arranged in a side-by-side style, and the dye molecules stand perpendicularly to the clay sheets. This conformation exhibits no photoluminescence.

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