Structure and dynamics of concentrated micellar solutions of sodium dodecyl sulfate

Gubaidullin, А. Т.; Литвинов, И. А.; Samigullina, Aida I.; Зуева, О. С.; Rukhlov, V. S.; Idiyatullin, B. Z.; Zuev, Yu. F.

doi:10.1007/s11172-016-1278-2

Cited by 20 publications

(22 citation statements)

References 63 publications

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“…4A) do not show evidence of ordered colloidal ("micellar") crystals, and instead indicate disordered micelle arrangements with strengthening intermicellar correlations with increasing c SDS . Previously published SAXS and SANS studies for SDS solutions (in the range of concentrations examined here) show a similar liquid-like structure comprising macroions (micelles) and their counterion cloud (70,(101)(102)(103)(104)(105)(106)(107).…”

Section: Discussionsupporting

confidence: 64%

Foam film stratification studies probe intermicellar interactions

Ochoa

Gao

Srivastava

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Ultrathin foam films containing supramolecular structures like micelles in bulk and adsorbed surfactant at the liquid–air interface undergo drainage via stratification. At a fixed surfactant concentration, the stepwise decrease in the average film thickness of a stratifying micellar film yields a characteristic step size that also describes the quantized thickness difference between coexisting thick–thin flat regions. Even though many published studies claim that step size equals intermicellar distance obtained using scattering from bulk solutions, we found no reports of a direct comparison between the two length scales. It is well established that step size is inversely proportional to the cubic root of surfactant concentration but cannot be estimated by adding micelle size to Debye length, as the latter is inversely proportional to the square root of surfactant concentration. In this contribution, we contrast the step size obtained from analysis of nanoscopic thickness variations and transitions in stratifying foam films using Interferometry Digital Imaging Optical Microscopy (IDIOM) protocols, that we developed, with the intermicellar distance obtained using small-angle X-ray scattering. We find that stratification driven by the confinement-induced layering of micelles within the liquid–air interfaces of a foam film provides a sensitive probe of non-DLVO (Derjaguin–Landau–Verwey–Overbeek) supramolecular oscillatory structural forces and micellar interactions.

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Section: Discussionsupporting

confidence: 64%

Foam film stratification studies probe intermicellar interactions

Ochoa

Gao

Srivastava

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…It is intriguing to consider that the solubility temperature behavior might yield insight into the difference between the micellar structure and behavior of CsDS and SDS. It is worthwhile to point out that even the simple compact spherical SDS micelle structure has detailed structure of interest − and that changes with ionic strength and concentration …”

Section: Resultsmentioning

confidence: 99%

“…It is worthwhile to point out that even the simple compact spherical SDS micelle structure has detailed structure of interest 35−37 and that changes with ionic strength 38 and concentration. 39 Another important feature of concentrations above 10 wt % was the appearance of persistent metastable mesophases. The heating rate needed to ensure equilibrium in our system was found to be less than or equal to 0.2 °C/min (cooling rates at 0.1 °C/min).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Krafft Temperature of Cesium Dodecylsulfate Solutions at High Concentration

et al. 2017

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Polarized transmitted light observation was used to examine the Krafft point temperature of cesium dodecylsulfate (CsDS) in water over a wide range of concentrations. CsDS shows an elevated Krafft temperature compared to that of sodium dodecyl sulfate (SDS). Unlike SDS, the CsDS solubility temperature remains virtually constant at high concentration. Also, the stable birefringent liquid crystal appears at a much lower concentration for CsDS than for SDS, and the concentration window of its coexistence with isotropic micellar solution is broader.

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“…The 1D kinetics of pyrromethene 597 (PM597) − in sodium dodecyl sulfate (SDS) micelles − are shown in Figure . The absorption change with parallel Δ ∥ A(τ) and perpendicular ΔA ⊥ (τ) polarizations are converted to the electronic, and rotational, decays (Figure a) .…”

mentioning

confidence: 99%

“…Many discussions of micelles are based on their average structure. This structure can be seen in measurements that average over many molecules, such as light, X-ray, or neutron , scattering. In a sense, they are mean-field discussions.…”

mentioning

confidence: 99%