Static fluorescence quenching in the study of micellar systems

Malliaris, Angelos

doi:10.1007/3-798-50724-4_77

Cited by 38 publications

(10 citation statements)

References 27 publications

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“…Fluorescence Behavior and Micellar Aggregation. The quenching of fluorescence of a suitable probe by a quencher has been successfully utilized to find out the micellar aggregation number − as well as the binding constant of the quencher with the probe. The relations used are the following: and where I 0 and I are the fluorescence intensities in the absence and presence of a quencher (Q), n is the average aggregation number, and K SV is the Stern−Volmer binding constant of the quencher with the probe (a 1:1 complex is assumed).…”

Section: Resultsmentioning

confidence: 99%

Micellar Properties of Cationic Surfactants in Pure and Mixed States

et al. 1996

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The solution properties of the surfactants dodecyl-, tetradecyl-, and hexadecyl(cetyl)trimethylammonium bromide (DTAB, TTAB, and CTAB, respectively) as well as hexadecylpyridinium chloride (CPC) in pure and mixed states (binary and ternary combinations) have been studied. The critical micelle concentration (cmc), counterion binding, aggregation number, polarity, thermodynamics of micellization, interfacial adsorption, etc., have been quantitatively estimated by surface tension, conductance, spectrophotometry, fluorescence, and calorimetric methods. The micellar compositions, activities of the components in the micelle, and their mutual interactions have been estimated from Rubingh's theory. The surfactant mixtures have been found to be nonideal, with a lower degree of counterion association compared to pure states, but possess more or less comparable micellar polarity and energetic parameters.

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Section: Resultsmentioning

confidence: 99%

Micellar Properties of Cationic Surfactants in Pure and Mixed States

et al. 1996

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“…The mean aggregation number of miceUes were obtained from luminescence quenching measurements [12][13][14]. Assuming that both the probe molecule (P) and the quencher molecule (Q) are solubilized into micelles obeying the Poisson distribution among micelles and that P is luminescent only in micelle free from Q, the measured ratio of luminescence intensities (I/I ~ in the presence of Q to that in the absence of Q is given by the equation…”

Section: Methodsmentioning

confidence: 99%

Properties of aqueous solution of sodium glycocholate and a nonionic surfactant, and their mixtures

Asano

Aki

Ueno

1989

Colloid & Polymer Sci

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The micellar properties of aqueous binary mixed solutions of sodium glycocholate, NaGC, and octa-oxyethylene glycol mono-n-decyl ether, C10Es, have been studied on the basis of surface tensions, the mean aggregation number and the polarity of the interior of the micelles. The mean aggregation number, measured by steady state quenching method, decreased with the increase of the mole fraction of NaGC in the mixed system. The polarity of the interior, estimated by the ratio of first and third vibronic peak in a monomeric pyrene fluorescence emission spectrum, suggested that the hydrophobicity ofintramicelles increased with the increase of the mole fraction of NaGCin the mixed system. These are considered to be caused by the differences in the chemical structure and the hydrophobic nature between NaGC and C10Es. The mean aggregation number and the polarity of the interior for each micelle near the CMC in lower total concentration of surfactants showed the tendency approaching those of pure micelle of the nonionic surfactant. This suggests that the ratio of NaGC in the initial micelles in the range of lower total concentration near the CMC is lower than that of the corresponding prepared mole fraction in the mixed system. This lower value was confirmed also from theoretical calculation of the ratio of NaGC at the CMC in the mixed micelle by regular solution treatment of Rubingh in the solution.

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“…The N agg were determined by steady-state fluorescence measurements at different mole fractions. The quenching of fluorescence of pyrene by hexadecylpyridinium chloride (HPyCl) has been utilized to find N agg [36,37]. The relevant relationship is given by From Eqs.…”

Section: Conductivity and Fluorescence Behaviormentioning

confidence: 99%