Raman spectroscopic studies of submillimolar surfactant solutions. Concentration dependence of the carbon-hydrogen stretching Raman lines

Kamogawa, Keiji; Tajima, Kazuo; Hayakawa, Kazuo; Kitagawa, Teizo

doi:10.1021/j150656a014

Cited by 26 publications

(10 citation statements)

References 2 publications

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“…Kamogawa et al have reported that dehydration of C-H results in reduction of wavenumber. 32 Namely, dehydration of alkyl chain involved in the surfactants may take place in a high concentration of FC6-HCn solutions.…”

Section: Resultsmentioning

confidence: 99%

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Micelle Aggregating Condition of Fluorocarbon−Hydrocarbon Hybrid Surfactants in Aqueous Solution

et al. 1997

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The micelle aggregating condition of sodium 1-oxo-1-[(4-fluoroalkyl)phenyl]-2-alkanesulfonate (FCm-HCn; m ) 4, 6, n ) 2, 4, 6), hybrid surfactants containing a fluorocarbon chain and a hydrocarbon chain in the same molecule, has been investigated by means of the pyrene fluorescence probe method and Raman spectroscopy. Micropolarity of the hydrocarbon moiety for the FCm-HCn micelles is examined with the I 1/I3 ratio in the fluorescence spectra of pyrene added as an indicator. The ratios for the FC6-HCn and FC4-HC6 solutions decrease significantly even above their critical micelle concentration (cmc), suggesting that these micelles gradually change their aggregation state above the cmc with concentration increment. The wavenumber of CH3 asymmetric stretching vibration for the FC6-HCn series in Raman spectra shifts to lower wavenumber at this concentration range, while that of FC4-HCn is almost constant. These results suggest that FC6-HCn and FC4-HC6 form a wet micelle first but another dehydrated micelle coexists above the second cmc.

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Section: Resultsmentioning

confidence: 99%

“…This behavior clearly confirms the presence of the second cmc, because this result is free from a probe (like pyrene) related to an adsorption isotherm. Kamogawa et al have reported that dehydration of C−H results in reduction of wavenumber …”

Section: Resultsmentioning

confidence: 99%

Micelle Aggregating Condition of Fluorocarbon−Hydrocarbon Hybrid Surfactants in Aqueous Solution

et al. 1997

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“…λ max was observed at 10 mmol/L and higher halothane concentration. At these concentrations, λ max shifted 22 nm to shorter wavelength (334 nm to 312 nm) because of an increased influence of the SDS micelle CH Raman-scattering peak (26). At 5 mmol/L halothane, λ max shifted only 5 nm to shorter wavelengths, whereas at lower concentrations (0.1 mmol/L to 1 mmol/L), the emission maximum remained unchanged at 334 nm.…”

Section: Figmentioning

confidence: 91%

“…By 0.4 mol/L halothane, the emission spectrum has shifted entirely over to the feature at 310 nm, which then decreases in intensity with increasing halothane. This feature is Raman-scattering peak for OH stretch (3300 cm -1 ) of 1octanol (26,27), which was revealed as the fluorescence of tryptophan was quenched. Plotting of the integrated emission intensity vs. quencher concentrations yielded a linear Stern-Volmer plot with a K SV value of 6 M -1 determined using eq.…”

Section: Quenching Of Gramicidin D In Octanolmentioning

confidence: 98%

Fluorescence quenching of gramicidin D in model membranes by halothane

Carnini¹,

Nguyen²,

Cramb³

2007

Can. J. Chem.

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Inhaled anesthetics were introduced in surgery over a century ago. To this day, the molecular mechanism of anesthetic action remains largely unknown. However, ion-channels of neuronal membranes are believed to be the most- likely molecular targets of inhaled anesthetics. In the study presented here, we investigated the interaction of a simplified ion-channel system, gramicidin, with halothane, a small haloalkane inhaled anesthetic in various environments. Fluorescence-quenching experiments of gramicidin D in dioleoylphosphatidylcholine (DOPC) large unilamellar vesicles (LUVS) have shown that halothane can directly interact with the ion channel (KSV = 66 M–1). Halothane quenched the fluorescence from tryptophan residues located at the lipid bilayer – aqueous interfaces as well as those tryptophans located deeper in the bilayer. Quenching data from gramicidin D in sodium dodecyl sulfide (SDS) micelles revealed that the tryptophan residues located at the micelle–solvent interface were preferentially quenched by halothane (KSV = 22 M–1). In 1-octanol, fluorescence quenching was observed, but with a lower KSV value (KSV = 6 M–1) than in DOPC LUVS and SDS micelles. Taken together, these results indicate that halothane interactions with gramicidin, mediated by a lipid bilayer, are the strongest, and that the mechanism of anesthetic action may also be lipid-mediated.

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“…The Monte Carlo method has been extensively used in percolation studies since this phenomenon has been described by Broadbent and Hammersley in 1957. 6 This technique has been applied extensively to determine a variety of percolation parameters, such as exponents, cluster sizes, and cluster shape parameters. A comprehensive, up-to-date summary of the field is provided in the just appeared monograph by Stauffer.…”

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confidence: 99%

Refined Monte Carlo simulations of static percolation

Hoshen¹,

Kopelman²,

Newhouse³

1987

J. Phys. Chem.

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A modified Monte Carlo approach is used to derive and check the consistency of the critical site percolation concentrations and some critical exponents of the square and triangular lattices (with lo9 sites). While we confirm both universality and the accepted value for y and v (and c, for the triangular lattice), our c, value for the square lattice (c, = 0.5929 & 0.0002) is slightly higher than some recently quoted values. This reopens the, questions of methodology and lattice size. We also give effective y exponents for multiple layers, showing a monotonic crossover from two-dimensional to three-dimensional values. The preexponent is roughly unity over a wide concentration range.

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Raman spectroscopic studies of submillimolar surfactant solutions. Concentration dependence of the carbon-hydrogen stretching Raman lines

Cited by 26 publications

References 2 publications

Micelle Aggregating Condition of Fluorocarbon−Hydrocarbon Hybrid Surfactants in Aqueous Solution

Micelle Aggregating Condition of Fluorocarbon−Hydrocarbon Hybrid Surfactants in Aqueous Solution

Fluorescence quenching of gramicidin D in model membranes by halothane

Refined Monte Carlo simulations of static percolation

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