Fluorescence probes for the phase transition in sodium dodecyl sulfate micelles near the second critical micelle concentration

Kim, Jisun; Kim, Chang-Kew; Song, Pill‐Soon; Lee, Keun-Moo

doi:10.1016/0021-9797(81)90183-1

Cited by 15 publications

(2 citation statements)

References 9 publications

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“…Typical surfactants, such as sodium dodecyl sulphate (SDS), go through micellar transitions with increasing concentration. 32,33 A first transition occurs from free surfactants in solution to micellar structures, at the cmc, typically forming spherical micelles. In some surfactants this is followed by a second This journal is © The Royal Society of Chemistry 2016 transition from spherical micelles to worm-like micelles, cmc 2 .…”

Section: Characterisation Of the Micellar Structuresmentioning

confidence: 99%

Linking micellar structures to hydrogelation for salt-triggered dipeptide gelators

et al. 2016

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Some functionalised dipeptides can form hydrogels when salts are added to solutions at high pH. We have used surface tension, conductivity, rheology, optical, confocal and scanning electron microscopy, (1)H NMR and UV-Vis spectroscopy measurements to characterise fully the phase behaviour of solutions of one specific gelator, 2NapFF, at 25 °C at pH 10.5. We show that this specific naphthalene-dipeptide undergoes structural transformations as the concentration is increased, initially forming spherical micelles, then worm-like micelles, followed by association of these worm-like micelles. On addition of a calcium salt, gels are generally formed as long as worm-like micelles are initially present in solution, although there are structural re-organisations that occur at lower concentrations, allowing gelation at lower than expected concentration. Using IR and SANS, we show the differences between the structures present in the solution and hydrogel phases.

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Section: Characterisation Of the Micellar Structuresmentioning

confidence: 99%

Linking micellar structures to hydrogelation for salt-triggered dipeptide gelators

et al. 2016

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“…In addition, changes in micellar shape, from spherical to rodlike, and the accompanying steric requirement favoring parallel packing may lead to enhanced concentration polarization. The break point associated with micellar shape transition at 25°C occurs at 5.2 mM for CPC [42] and at 73 mM for SDS [43]. The micelle shape most commonly associated with TX-100 is oblate ellipsoidal throughout the concentration range investigated [44].…”

Section: Ultrafiltration Permeate Fluxesmentioning

confidence: 97%

Use of Micellar Solutions as Draw Agents in Forward Osmosis

Roach¹,

Al‐Abdulmalek²,

Al-Naama³

et al. 2014

J Surfact & Detergents

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Recent advances in membrane technologies have enhanced the viability of water treatment strategies that employ semipermeable barriers. Forward osmosis (FO), which exploits the natural osmotic pressure gradient between a ''draw'' solution and a ''feed'' solution to produce potable water, offers a low-energy, low-cost alternative to more conventional treatment methods. Surfactants, because of their tendencies to aggregate into micelles and to adsorb at interfaces, provide intriguing osmotic pressures and offer exploitable properties by which draw solutions can be regenerated. The effectiveness of surfactant-based FO using cellulose triacetate membranes has been assessed in terms of water flux and reverse surfactant diffusion using cetylpyridinium chloride, sodium dodecylsulfate, and Triton X-100. The ratios of water flux to surfactant flux exceeded 600 L mol -1 for all surfactants studied. Surfactant recoveries of over 99 % were achieved by ultrafiltration using regenerated cellulose membranes.

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Photophysical Processes in Cyanobiphenyl Derivatives. II. Cyanobiphenyl Derivatives as Fluorescent Probes in Micellar Environment

David

Szalai

Baeyens‐Volant

1982

Ber Bunsenges Phys Chem

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Two 4‐cyano‐4′‐alkoxybiphenyl derivatives (3 COB‐8 COB) have been used as fluorescent micellar probes in four different surfactants (SDS, CTAB, NPh‐EO‐9, and NPh‐EO‐30) the concentration [S] of which varies in a broad range around the CMC. The distribution constant K for the solubilization of the probes between micelles and water and the solubility S in the surfactant are obtained from the absorption spectra after saturation of the sample either by stirring at room temperature or by ultrasonication. CMC values in agreement with those reported in the literature are determined from the curves λmax = f[S]. According to the saturation method, a different type of aggregate is formed below the CMC in the case of 8 COB. The emission spectra demonstrate that the COB derivatives are preferentially solvated in polar environment (polarity > ethanol). The assignment of the observed enhanced line width as compared to homogeneous solutions reveals the existence of several types of sites with different polarities and indicates inhomogeneous locations in the micelle with exchange times slower than about 1 nanosecond. – The results are tentatively interpreted according to the Fromherz's surfactant‐block model of the micelle.

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Fluorescence probes for the phase transition in sodium dodecyl sulfate micelles near the second critical micelle concentration

Cited by 15 publications

References 9 publications

Linking micellar structures to hydrogelation for salt-triggered dipeptide gelators

Linking micellar structures to hydrogelation for salt-triggered dipeptide gelators

Use of Micellar Solutions as Draw Agents in Forward Osmosis

Photophysical Processes in Cyanobiphenyl Derivatives. II. Cyanobiphenyl Derivatives as Fluorescent Probes in Micellar Environment

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