NMR relaxation in isotropic surfactant systems. A deuterium, carbon-13, and nitrogen-14 NMR study of the micellar (L1) and cubic (I1) phases in the dodecyltrimethylammonium chloride water system

Soederman, Olle; Walderhaug, Harald; Henriksson, Ulf; Stilbs, Peter

doi:10.1021/j100263a024

Cited by 113 publications

(64 citation statements)

References 5 publications

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“…NMR results, however, indicated a structure of isolated surfactant aggregates [28][29][30]. Recently, a structure based on hemispheric capped rods with an axial ratio of 2 in a primitive cubic arrangement (space group Pm3n) was proposed [31], and seems to be confirmed by NMR studies [32,33]. Based on the electron micrographs reported here and previously [14], a structure based on (nearly) globular aggregates seems more likely.…”

Section: Discussionsupporting

confidence: 69%

Freeze-fracture electron microscopy study of mesophases in mixtures of polyoxyethylene (14) oleylether and water

Jousma

Bouwstra

Spies³

et al. 1987

Colloid & Polymer Sci

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Mixtures of polyoxyethyleneoleylether, with an average of 14 oxyethylene units per molecule, and water, were investigated at between 20 ~ and 100 ~ using polarization microscopy. A lamellar (La), hexagonal (H1), viscous isotropic (V1) and cubic (I1) mesophase were found and an outline of the pseudo binary phase diagram was constructed. The mesophases were investigated with freeze-fracture electron microscopy and micrographs of characteristic textures are presented. L~ and H1 displayed well known features, the repeat distances observed were in good agreement with findings from X-ray diffraction. H1 showed fracture planes with and without a ribbed pattern. Using specific decoration with ice crystals, fracture planes with the ribbed pattern were found to be more hydrophilic. V1 showed regular patterns, in some places forming a square lattice, in other places resembling a network of short rods with two-dimensional hexagonal symmetry. The repeat spacing observed in the textures was about 11 nm. I 1 showed foremost fractured layers with a fine texture of spherical units in a two-dimensional hexagonal array. The centre-to-centre distance between these units was about 8-9 nm.

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Section: Discussionsupporting

confidence: 69%

Freeze-fracture electron microscopy study of mesophases in mixtures of polyoxyethylene (14) oleylether and water

Jousma

Bouwstra

Spies³

et al. 1987

Colloid & Polymer Sci

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“…The above publications spurred an increase in the use of 14 N NMR as a probe of LCs, lipid bilayers and related systems, with a number of reports studying 14 N linewidths and relaxation [180][181][182][183][184][185][186][187][188][189][190][191], and others investigating quadrupolar splittings [192][193][194][195][196][197][198][199][200][201][202][203][204][205][206][207][208][209][210].…”

Section: Aligned Systemsmentioning

confidence: 99%

Direct detection of nitrogen-14 in solid-state NMR spectroscopy

O’Dell¹

2011

Progress in Nuclear Magnetic Resonance Spectroscopy

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“…For isotropic phases, 1~C NMR has provided valuable information on chain dynamics through relaxation studies [1][2][3][4] but has also been used to determine aggregation numbers from the concentration dependence of the 13C shift [5][6][7][8]. Since the aggregation number is an important physical parameter, and few other straightforward and simple methods exist to determine them, the method appears rather promising.…”

Section: Introductionmentioning

confidence: 99%

“…In order to relate the micellar aggregation number to concentrations one then uses the mass action law on the following equilibrium n A .~ An (2) and write…”

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confidence: 99%

On the determination of micellar aggregation numbers from the concentration dependence of13C NMR chemical shifts

Söderman

Guering²

1987

Colloid & Polymer Sci

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Abstract:The assumptions underlying the extraction of micellar aggregation numbers by means of applying the mass action law to the concentration dependence of i3C Nuclear Magnetic Resonance (NMR) shift data are discussed. Such data are presented for sodium dodecylsulfate and it is shown that the extracted aggregation numbers are far too small. It is argued that this is in part due to a failure of the mass action law to describe the micellization process but also due to covariance in the parameters of the mass action law. We also suggest a way to analyse 13C shifts from surfactant systems that is void of artefacts due to changes in volume magnetic susceptibilities and other "unwanted" artefacts. Finally, we point out that by combining 13C shifts with the fraction of micellized surfactant (as measured by for instance self diffusion coefficients) it should be possible to monitor changes in micellar shapes as the conditions are changed.

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NMR relaxation in isotropic surfactant systems. A deuterium, carbon-13, and nitrogen-14 NMR study of the micellar (L1) and cubic (I1) phases in the dodecyltrimethylammonium chloride water system

Cited by 113 publications

References 5 publications

Freeze-fracture electron microscopy study of mesophases in mixtures of polyoxyethylene (14) oleylether and water

Freeze-fracture electron microscopy study of mesophases in mixtures of polyoxyethylene (14) oleylether and water

Direct detection of nitrogen-14 in solid-state NMR spectroscopy

On the determination of micellar aggregation numbers from the concentration dependence of13C NMR chemical shifts

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