Electron Paramagnetic Resonance and Small-Angle Neutron Scattering Studies of Mixed Sodium Dodecyl Sulfate and (Tetradecylmalono)bis(<i>N</i>-methylglucamide) Surfactant Micelles

Griffiths, Peter Charles; Cheung, A. Y. F.; Finney, G. J.; Farley, C. W.; Pitt, A. R.; Howe, Andrew M.; King, Stephen M.; Heenan, Richard K.; Bales, Barney L.

doi:10.1021/la011163j

Cited by 25 publications

(26 citation statements)

References 15 publications

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“…Synergistic interactions between the SDS and P123 were observed, these interactions were characterised by the adsorption of the SDS into the PPO core. It was also observed that addition of ethanol to both P123 and SDS solubilized the PPO core, increasing the CMC of P123, and that reducing the dielectric constant of the solvent led to the formation of smaller micelles in both cases [6,11,19].…”

Section: Introductionmentioning

confidence: 89%

“…Mixtures of small molecules surfactant with Pluronic have previously been examined [6,19,20] as has the effect of alcohols [11,13,21]. To our knowledge, there have been far fewer studies of the quaternary systems, Pluronic/small molecule surfactants/alcohol/water, at least in non (micro) emulsion systems.…”

Section: Introductionmentioning

confidence: 99%

“…Self-diffusion coefficients obtained by PGSE-NMR were used to determine values of , (free fraction of alcohol not solubilised the micelles) as shown in equation (6).…”

Section: Effect Of Alcohols On the Pluronic Micelle Structure Scattementioning

confidence: 99%

“…and 123 are the molecular volumes of SMS and P123 respectively. The micelle composition was extracted from the SANS data without any data fitting [6], from the ratio of the intensities of scattering R(Q) obtained with h-and d-SMS at the same composition via:…”

Section: Surface Tensionmentioning

confidence: 99%

“…A widely studied and practically relevant series of surfactants is the water soluble triblock copolymer group made up of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), denoted as (PEOn-PPOm-PEOn), commercially known as Pluronic (BASF), Synperonic (Croda) or Poloxamers (ICI) [1][2][3][4][5][6][7]. The CMC is sensitive to the chemical composition of the Pluronic and various grades are available.…”

Section: Introductionmentioning

confidence: 99%

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Probing competitive interactions in quaternary formulations

Mansour

Cattoz

Heenan

et al. 2015

Journal of Colloid and Interface Science

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Hypothesis: The interaction of amphiphilic block copolymers of the poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) group with small molecule surfactants may be "tuned" by the presence of selected alcohols, with strong interactions leading to substantial changes in (mixed) micelle morphology, whilst weaker interactions lead to coexisting micelle types. Experiments:The nature and the strength of the interactions between Pluronic P123 (EO20PO70EO20) and small molecule surfactants (anionic sodium dodecylsulfate, SDS, C12SO4Na), (cationic dodecyltrimethylammonium bromide, C12TAB) and (non-ionic polyoxyethylene(23)lauryl ether, Brij 35, C12EO23OH) is expected to depend on the partitioning of the short, medium and long chain alcohols (ethanol, hexanol and decanol respectively) and was probed using tensiometry, pulsed-gradient spin-echo nuclear magnetic resonance (PGSE-NMR) and small-angle neutron scattering (SANS). Findings:The SANS data for aqueous P123 solutions with added alcohols were well described by a charged spherical core/shell model for the micelle morphology. The addition of the surfactants led to significantly smaller, oblate elliptical mixed micelles in the absence of alcohols. Addition of ethanol to these systems led to a decrease in the 2 micelle size, whereas larger micelles were observed upon addition of the longer chain alcohols. NMR studies provided complementary estimates of the micelle composition, and the partitioning of the various components into the micelle.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

“…Self-diffusion coefficients obtained by PGSE-NMR were used to determine values of , (free fraction of alcohol not solubilised the micelles) as shown in equation (6).…”

Section: Effect Of Alcohols On the Pluronic Micelle Structure Scattementioning

confidence: 99%

Section: Surface Tensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probing competitive interactions in quaternary formulations

Mansour

Cattoz

Heenan

et al. 2015

Journal of Colloid and Interface Science

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The Structure of Metallomicelles

Griffiths

Fallis

Willock

et al. 2004

Chemistry A European J

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The morphology of micelles formed by two novel metallosurfactants has been studied by small-angle neutron scattering (SANS) and small-angle-X-ray scattering (SAXS). The two surfactants both contain a dodecyl chain as the hydrophobic moiety, but differ in the structure of the head group. The surfactants are Cu(II) complexes of monopendant alcohol derivatives of a) the face-capping macrocycle 1,4,7-triazacyclanonane (tacn), and b) an analogue based upon the tetraazamacrocycle 1,4,7,10-tetraazacyclododecane. Here, neutron scattering has been used to study the overall size and shape of the surfactant micelles, in conjunction with X-ray scattering to locate the metal ions. For the 1,4,7,10-tetraazacyclododecane-based surfactant, oblate micelles are observed, which are smaller to the prolate micelles formed by the 1,4,7-triazacyclononane analogue. The X-ray scattering analysis shows that the metal ions are distributed throughout the polar head-group region, rather than at a well-defined radius; this is in good agreement with the SANS-derived dimensions of the micelle. Indeed, the same model for micelle morphology can be used to fit both the SANS and SAXS data.

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Probing interactions within complex colloidal systems using PGSE‐NMR

Griffiths¹,

Cheung²,

Davies³

et al. 2002

Magnetic Reson in Chemistry

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Pulsed-gradient spin-echo NMR (PGSE-NMR) has evolved into a powerful technique for probing colloidal structure, particularly that of complex mixtures. Indeed, with the exception perhaps of neutron scattering, no single technique has such universal applicability. The parameter of interest, the (self-) diffusion coefficient, is of fundamental importance as it is determined by both the chemistry of the system -the size and shape of the individual molecular species -and its physical environment/state -dissolved, dispersed, aggregated, constrained within boundaries, etc. Understanding such behaviour is of central importance in the biological and colloidal fields. The basis of using diffusion as a probe of such systems relies on the fact that each species in a mixture can be separated by differences in their diffusion coefficient and/or by the chemical specificity of NMR. Binding, aggregation and structure elucidation studies have undergone a renaissance in the last decade owing to the increased commercial availability of hardware and improved data processing. This paper highlights just a few of the many and diverse applications to which PGSE-NMR can be put.

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Electron Paramagnetic Resonance and Small-Angle Neutron Scattering Studies of Mixed Sodium Dodecyl Sulfate and (Tetradecylmalono)bis(N-methylglucamide) Surfactant Micelles

Cited by 25 publications

References 15 publications

Probing competitive interactions in quaternary formulations

Probing competitive interactions in quaternary formulations

The Structure of Metallomicelles

Probing interactions within complex colloidal systems using PGSE‐NMR

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