NMR study of the transformation of sodium dodecyl sulfate micelles

Jing, Zhao; Fung, B. M.

doi:10.1021/la00029a013

Cited by 71 publications

(64 citation statements)

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“…Concentrations of SDS used for measuring all spectra were at least 10 times more than its critical micellar concentration (CMC). The 1 H NMR spectrum of SDS recorded in D 2 O compared well with that described in the literature (15,16). Although the solubility of various organic molecules used for the present study in D 2 O is in the order of 10 −4 -10 −5 mol/L, this was found to be sufficient to acquire their NMR spectra in D 2 O.…”

Section: Methodssupporting

confidence: 71%

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Solubilization Site of Organic Perfume Molecules in Sodium Dodecyl Sulfate Micelles: New Insights from Proton NMR Studies

Suratkar

Mahapatra

2000

Journal of Colloid and Interface Science

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Section: Methodssupporting

confidence: 71%

“…It is possible that the splitting of methylene protons is due to the consequence of a gradual change in micelle conformational structure from spherical to large rodshaped (2,15), the latter being capable of accommodating more solubilizate.…”

Section: Discussionmentioning

confidence: 99%

Solubilization Site of Organic Perfume Molecules in Sodium Dodecyl Sulfate Micelles: New Insights from Proton NMR Studies

Suratkar

Mahapatra

2000

Journal of Colloid and Interface Science

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“…Preliminary NMR observations on these micelles had given evidence of a surprising difference between H 2 O and a particular buffered solution (borate buffer). This salt effect is partly known in the literature [10] [11] and may potentially provide important information on the structure of the micelles. For this reason, we thought it worthwhile to carry out a systematic investigation in the two solvent systems.…”

mentioning

confidence: 91%

NMR Study of Micelles Formed by Monoalkylphosphoryl Nucleosides

Zandomeneghi

Luisi

Mannina

et al. 2001

HCA

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An NMR investigation of aqueous micelles obtained from surfactants bearing a nucleotide head attached to a linear hexadecyl hydrocarbon chain is presented. In particular, hexadecylphosphoryl-adenosine (C16-AMP) and hexadecylphosphoryl-uridine (C16-UMP) are studied by a combination of 1 H-NMR techniques such as NOESY, ROESY, and spin-lattice relaxation times. Both the intramolecular (i.e., within one surfactant monomer) and the intermolecular interactions (i.e., between neighboring surfactant molecules) are investigated. Relaxation measurements show that different groups of the surfactant molecule have distinct dynamic properties, the internal mobility decreases starting from the head group towards the Me terminal, while protons belonging to the base (which should be exposed to water) enjoy considerable freedom. The large upfield shift of the resonance of the terminal Me groups is evidence of a collective property of the micelle, an effect that, to the best of our knowledge, has not been reported so far. The micelles are studied both in water and salt solution, and the noticeable difference between the two cases is interpreted as a salt-induced stiffening effect. By mixing C16-AMP with C16-UMP, mixed micelles are obtained, i.e., micelles that contain both surfactant monomers in each aggregate; our analysis shows that a significant interaction between the two complementary aromatic bases is present. All these results allow us to draw a picture of the surfactant in the micelle in which the plane of the aromatic ring lies parallel to the surface of the micelle and towards the aqueous medium. There are no basic structural differences between C16-AMP and C16-UMP micelles or C16-AMP/C16-UMP mixed micelles.

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“…[11][12][13][14][15][16][17][18][19] We summarize below, briefly, what is known via a variety of techniques 11,12,[14][15][16][17][18][19][20][21][22] including NMR relaxometry 11,23,24 and diffusometry. 10,12,18,19,25 1.…”

Section: Introductionmentioning

confidence: 99%

An NMR study of macromolecular aggregation in a model polymer-surfactant solution

Barhoum

Yethiraj

2010

The Journal of Chemical Physics

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A model complex-forming nonionic polymer-anionic surfactant system in aqueous solution has been studied at different surfactant concentrations. Using pulsed-field-gradient diffusion NMR spectroscopy, we obtain the self-diffusion coefficients of poly͑ethylene glycol͒ ͑PEO͒ and sodium dodecyl sulfate ͑SDS͒ simultaneously and as a function of SDS concentration. In addition, we obtain NMR relaxation rates and chemical shifts as a function of SDS concentration. Within the context of a simple model, our experimental results yield the onset of aggregation of SDS on PEO chains ͑CAC= 3.5 mM͒, a crossover concentration ͑C 2 =60 mM͒ which signals a sharp change in relaxation behavior, as well as an increase in free surfactant concentration and a critical concentration ͑C m = 145 mM͒ which signals a distinct change in diffusion behavior and a crossover to a solution containing free micelles. C m also marks the concentration above which obstruction effects are definitely important. In addition, we obtain the concentration of SDS in monomeric form and in the form of free micelles, as well as the average number of SDS molecules in a PEO-SDS aggregate ͑N Aggr ͒. Taken together, our results suggests continuous changes in the aggregation phenomenon over much of the concentration but with three distinct concentrations that signal changes in the nature of the aggregates.

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NMR study of the transformation of sodium dodecyl sulfate micelles

Cited by 71 publications

References 0 publications

Solubilization Site of Organic Perfume Molecules in Sodium Dodecyl Sulfate Micelles: New Insights from Proton NMR Studies

Solubilization Site of Organic Perfume Molecules in Sodium Dodecyl Sulfate Micelles: New Insights from Proton NMR Studies

NMR Study of Micelles Formed by Monoalkylphosphoryl Nucleosides

An NMR study of macromolecular aggregation in a model polymer-surfactant solution

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