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Your search keyword '"Rixt T. Buwalda"' showing total 2 results
Start Over Author "Rixt T. Buwalda" Topic methyl orange
2 results on '"Rixt T. Buwalda"'

1. Interactions of an azobenzene-functionalized anionic amphiphile with cationic amphiphiles in aqueous solution

Author

Rixt T. Buwalda, Jan B.F.N. Engberts, Marc C. A. Stuart, Faculty of Science and Engineering, Rijksuniversiteit Groningen, Stratingh Institute of Chemistry, Elektronenmicroscopie, and Synthetische Organische Chemie

Subjects
VESICLE FORMATION, Absorption spectroscopy, Inorganic chemistry, Micelle, PHASE-BEHAVIOR, chemistry.chemical_compound, Amphiphile, Polymer chemistry, Electrochemistry, Methyl orange, LANGMUIR-BLODGETT-FILM, General Materials Science, SODIUM DODECYL-SULFATE, SURFACTANTS, Spectroscopy, Aqueous solution, Hydrotrope, Cationic polymerization, BILAYER ASSEMBLIES, Surfaces and Interfaces, Condensed Matter Physics, SUPRAMOLECULAR ASSEMBLIES, chemistry, Azobenzene, AZO-DYES, POLY-L-LYSINE, METHYL-ORANGE
Abstract

Interactions between the azobenzene-containing amphiphile methyl octyl orange (MOO) and n-alkyltrimethylammonium bromides (CnTAB, n = 1, 6, 8, 10, 12, 16) in aqueous solution have been studied using UV−vis spectroscopy. Interactions occur at concentrations below the critical micelle concentrations of the individual cationic surfactants (n = 8, 10, 12, 16) as indicated by a ca. 80 nm blue shift of the main absorption band of MOO. In addition, aggregation of MOO with C6TAB, which is a hydrotrope rather than a surfactant, was also observed. The critical aggregation concentration (cac) of MOO determined by surface tension experiments was 0.68 mM. The cac's of aqueous mixtures of CnTAB and MOO (1:1) were considerably lower than those of the individual surfactants. The absorption spectrum of MOO at concentrations above the cac in the 1:1 mixtures was also blue shifted with respect to the absorption spectrum of MOO in aqueous solution. Vesicular aggregates formed in equimolar aqueous mixtures of CnTAB and MOO we...

Published
2002

2. Aggregation of azo dyes with cationic amphiphiles at low concentrations in aqueous solution

Author

Rixt T. Buwalda, Jessica M. Jonker, Jan B. F. N. Engberts, Faculty of Science and Engineering, Stratingh Institute of Chemistry, Synthetische Organische Chemie, and Moleculaire Anorganische Chemie

Subjects
VESICLE FORMATION, BROMIDE MICELLES, Methyl yellow, chemistry.chemical_compound, INDUCED OPTICAL-ACTIVITY, Bromide, BINDING, Electrochemistry, Methyl orange, Organic chemistry, WATER, General Materials Science, SURFACTANTS, Spectroscopy, Aqueous solution, Cationic polymerization, Surfaces and Interfaces, Condensed Matter Physics, Sulfonate, chemistry, Azobenzene, POLY-L-LYSINE, Methyl red, METHYL-ORANGE, DODECYLTRIMETHYLAMMONIUM CHLORIDE, BEHAVIOR, Nuclear chemistry
Abstract

The aggregation of a series of n-alkyltrimethylammonium bromide (CnTAB, n = 10, 12, 14, 16, and 18) and 4-n-alkyl-1-methylpyridinium iodide amphiphiles (CmpyI, m = 8, 10, 12, and 14) induced by low concentrations of azo dyes in aqueous solution has been investigated by means of ultraviolet (UV) spectroscopy. It was observed that aggregation takes place at surfactant concentrations far below the cmc of C12TAB, C14TAB, C16TAB, and C18TAB with methyl orange (MO), ethyl orange (EO), and para-methyl red (pMR). Aggregation below the cmc of C10TAB was also induced by EO. In the case of MO and pMR, however, higher dye concentrations were necessary to induce aggregation. Interactions at low surfactant concentrations have also been observed in aqueous solutions of C10pyI, C12pyI, and C14pyI with MO. Binding of methyl red (MR), methyl yellow (MY), and azobenzene sulfonate (ABS) with cationic surfactants below their cmc did not occur. Aggregation was reflected by the appearance of a blue-shifted absorption band in th...

Published
1999

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