Surface-induced J aggregation of pseudoisocyanine dye at a glass/solution interface studied by total-internal-reflection fluorescence spectroscopy

Article Abstract:

An aqueous pseudoisocyanine dye solution in a soda lime glass optical cell exhibited a J aggregate at around 577 nm at room temperature. J aggregates are higher order aggregates that form during a spectral shift or during the appearance of a new absorption band. The formation of the J aggregate was not observed in a quartz glass cell. This indicates that the J aggregate formation was induced by interactions between the dye and the soda lime glass surface. Total-internal-reflection fluorescence spectroscopy proved that the J aggregate was distributed only around the glass surface.

Usage, Absorption spectra, Fluorescence spectroscopy, Dyes and dyeing, Dyeing, Dyes

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Intrinsic droplet-size effect on mass transfer rate across a single-microdroplet/water interface: role of adsorption on a spherical liquid/liquid boundary

Article Abstract:

An analysis of the ion mass transfer (MT) processes of 2-ferrocenyl-2-propanol (FeCp-PrOH) across a droplet/water interface was undertaken in relation to the droplet ratio reliance of the interfacial MT rate. The methods used were laser tapping and electrochemistry techniques with the interfacial tension at a water/nitrobenzene (NB) interface determined through a pendant drop method. It was discovered that the MT processes of FeCp-PrOH across the NB droplet/water interface were influenced by the adsorption of the solute on the interface.

Adsorption, Surface tension, Mass transfer

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Anisotropic growth of J aggregates of pseudoisocyanine dye at a mica/solution interface revealed by AFM and polarization absorption measurements

Article Abstract:

A study was conducted to further clarify the J-aggregation process by investigating the role of a mica surface in the formation of J aggregates. Atomic force microscopy and polarization absorption measurements were used to investigate the orientation of J-aggregate islands relative to the surface of mica at an initial growing stage of the J aggregates. It was found, among other results, that the J-aggregate islands are anisotropically oriented with respect to the lattice of a mica substrate.

Anisotropy, Chlorides, Anisotropy (Physics)

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