Small-angle X-ray scattering study of the structure of soap and detergent micelles

Reiss‐Husson, Françoise; Luzzati, Vittorio

doi:10.1016/0095-8522(66)90051-1

Cited by 79 publications

(23 citation statements)

References 14 publications

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“…These have provided a determination of the size, shape, and charge of the micelles [2][3][4][5][6][7]. At larger angles, the diffuse band corresponding to the average distance between two surfactant chains has been observed by Luzzati et al.…”

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confidence: 87%

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Structure of the water/surfactant interface in micelles : an NMR study of SDS micelles labelled with paramagnetic ions

Cabane

1981

J. Phys. France

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Résumé. 2014 On présente une méthode nouvelle pour déterminer la structure de l'interface eau/surfactant et la configuration des molécules dans les micelles de surfactant. Cette méthode consiste à observer par RMN les interactions dipolaires entre les noyaux des molécules de surfactant et des contreions paramagnétiques adsorbés sur la surface de ces micelles. L'experience compare les vitesses de relaxation de noyaux appartenant à différents groupes chimiques dans les molécules de surfactant; dans certains cas simples ces vitesses de relaxation dépendent seulement des distances entre les noyaux et les ions. Ainsi les vitesses de relaxation mesurées peuvent être reliées aux populations des noyaux dans des couches situées à diverses profondeurs de la surface. Les résultats mènent à la discuscussion suivante pour la structure de ces couches successives : (i) couches de surface contenant les charges hydratées (sont-elles lisses ou rugueuses ?); (ii) couches de contact eau/hydrocarbone (jusqu'à quelle profondeur l'eau pénètre-t-elle dans la micelle ?); (iii) couches du coeur hydrocarboné (quel est le degré d'organisation des chaines du surfactant ?).Abstract. 2014 A method has been developed for determining the structure of the water/surfactant interface and the configuration of the surfactant molecules in micelles. In this method, NMR is used to measure the magnetic dipolar interactions between the nuclei of the surfactant molecules and paramagnetic counterions adsorbed on the surface of the micelles. The experiment compares the relaxation rates of nuclei belonging to different chemical groups in the surfactant molecules; in some simple cases these relaxation rates only depend on the distances between the nuclei and the ions. Then the measured relaxation rates can be related to the populations of the nuclei in layers located at various depths from the paramagnetic surface. According to the data, the structure of these successive layers in a spherical micelle can be discussed in the following terms : (i) outermost layers containing the hydrated charges (how smooth or regular are they ?) ; (ii) layers of water/hydrocarbon contact (how deep does water penetrate in the micelle ?) ; (iii) layers of the hydrocarbon core (how disorganized is the packing of the surfactant chains ?).J. Physique 42 (1981)

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confidence: 87%

“…The data shown in figure 2 indicate that SDS chains in spherical micelles are very far from the radial configuration ; rather, they suggest that, after a few radial segments, many (15.8 A) [4,5]. This defines the volume of the hydrocarbon core, and therefore the maximum number N of chains which can be packed into this core.…”

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confidence: 99%

Structure of the water/surfactant interface in micelles : an NMR study of SDS micelles labelled with paramagnetic ions

Cabane

1981

J. Phys. France

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“…In aqueous micellar solutions, all soaps undergo a transition from spherical to rodlike micelles when their concentration is increased. 23,24 As a consequence, normal hexagonal H 1 is the first liquid crystalline phase to be formed. This has been shown to apply also for carboxylate surfactants with big organic counterions like alkyl amines or quaternary ammonium ions.…”

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Aqueous phase behaviour of choline carboxylate surfactants—exceptional variety and extent of cubic phases

et al. 2011

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Choline carboxylate surfactants are powerful alternatives to the well-known classical alkali soaps, since they exhibit substantially increased water solubility while maintaining biocompatibility, in contrast to simple quaternary ammonium ions. In the present study, we report the aqueous binary phase diagrams and a detailed investigation of the lyotropic liquid crystalline phases formed by choline carboxylate surfactants (ChCm) with chain lengths ranging from m ¼ 12-18 and at surfactant concentrations of up to 95-98 wt%. The identification of the lyotropic mesophases and their sequence was achieved by the penetration scan technique. Structural details are elucidated by small-angle X-ray scattering (SAXS). The general sequence of mesophases with increasing soap concentration was found to be as follows: micellar (L 1 ), discontinuous cubic (I 1 ), hexagonal (H 1 ), bicontinuous cubic (V 1 ) and lamellar (L a ). The main difference to the phase behavior of alkali soaps or of other mono-anionic surfactants is the appearance and large extent of a discontinuous cubic phase with two or even more different symmetries. The obtained phase diagrams further highlight the extraordinarily high water solubility of ChCm soaps. Finally, structural parameters of ChCm salts such as the cross-sectional area at the polarnonpolar interface are compared to those of alkali soaps and discussed in the terms of specific counterion binding and packing constraints.

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“…micelle of 5 -6.5 nni. Although previously reported analyses, which assume a sharp boundary between the head group region and the core, gave widely varying dimensions (Reiss-Husson and Luzzati, 1966;Kratky and Muller, 1982;Itri and Amaral, 1991), they all fall within the limits set by our simple two shell model. Our results are, however, more consistent with a model of a spherical micelle that has a diffuse boundary between head group and core regions.…”

Section: Structure Of the Sds/micellementioning

confidence: 92%

“…It is well established that SDS, at concentrations above its CMC, has a propensity to form spherical micelles in water (Reiss-Husson and Luzzati, 1966;Kratky and Muller, 1982;Itri and Amaral, 1991). The X-ray solution scattering profile of the pure SDS micelles under the conditions we have chosen (Fig.…”

Section: Structure Of the Sds/micellementioning

confidence: 99%

Evidence for Sodium Dodecyl Sulfate/Protein Complexes Adopting a Necklace Structure

Samsó

Daban

Hansen³

et al. 1995

European Journal of Biochemistry

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Structural analysis by cryo-electron microscopy and small-angle X-ray scattering of ten sodium dodecyl sulfate/protein complexes in 25 mM Tris/HCI, 0.192 M glycine, pH 8.3, showed necklace-like structures of spherical micelles dispersed along the unfolded peptide chain. The micelles of most SDS/protein complexes had a constant diameter (= 6.2 nm), slightly larger than pure SDS micelles (-5.7 nm), all micelles possessing a degree of surface roughness. The micelle-associated polypeptide is mostly situated at the interface of the sulfate head groups and hydrocarbon core, intruding into the core rather than outward from the surface. Proteins with a molecular mass less than about 20 kDa formed complexes with a single SDS micelle. Multi-micellar SDSIprotein complexes had centre-to-centre intermicellar distances in the range 7.0-12.0 nm. Our findings on the constancy of micellar size, number of micelles/complex, and the relationship between the degree of occupancy of micelles and a polypeptide's molecular mass, have enabled us to speculate on the correlation between the electrophoretic mobility of a polypeptide in SDS/PAGE and its molecular mass. The anomalous electrophoretic behaviour observed for the sodium dodecyl sulfate/histone H5 complex is accounted for by the large micelle of its complex.

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Small-angle X-ray scattering study of the structure of soap and detergent micelles

Cited by 79 publications

References 14 publications

Structure of the water/surfactant interface in micelles : an NMR study of SDS micelles labelled with paramagnetic ions

Structure of the water/surfactant interface in micelles : an NMR study of SDS micelles labelled with paramagnetic ions

Aqueous phase behaviour of choline carboxylate surfactants—exceptional variety and extent of cubic phases

Evidence for Sodium Dodecyl Sulfate/Protein Complexes Adopting a Necklace Structure

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