A conformational investigation of zwitterionic surfactants in the micelle via 13C chemical shift measurements and 2D NOESY spectroscopy

McLachlan, Aleisha A.; Singh, Kulbir; Marangoni, D. Gerrard

doi:10.1007/s00396-009-2182-1

Cited by 10 publications

(10 citation statements)

References 31 publications

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“…To complement the spectroscopic studies above, we have examined the internal structural change of the micelle induced by the solubilization of n -alkylbenzenes employing the two-dimensional nuclear Overhauser effect spectroscopy (2-D NOESY). This technique can provide detailed information on the spatial vicinity (<0.5 nm) of two different components and thus has been used as an effective method of studying the solubilization in micelles. , The 1 H NMR spectrum of the 14-10-14,2Br – solution at 2.0 mmol dm –3 is shown in Figure A, where the chemical structure of the surfactant is inserted. The characteristic peaks are assigned by labels a–f: (a) 0.80, (b) 1.28, (c) 1.20, (d) 1.60, (e) 3.03, and (f) 3.20 ppm.…”

Section: Resultsmentioning

confidence: 99%

“…This technique can provide detailed information on the spatial vicinity (<0.5 nm) of two different components and thus has been used as an effective method of studying the solubilization in micelles. 36,46 The 1 H NMR spectrum of the 14-10-14,2Br − solution at 2.0 mmol dm −3 is shown in Figure 8A, where the chemical structure of the surfactant is inserted. The characteristic peaks are assigned by labels a−f: (a) 0.80, (b) 1.28, (c) 1.20, (d) 1.60, (e) 3.03, and (f) 3.20 ppm.…”

Section: -D Noesy Plotsmentioning

confidence: 99%

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Solubilization of n-Alkylbenzenes into Gemini Surfactant Micelles in Aqueous Medium

et al. 2014

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Solubilization of benzene, toluene, ethylbenzene, n-propylbenzene, n-butylbenzene, and n-pentylbenzene into micelles of decanediyl-1-10-bis(dimethyltetradecylammonium bromide) (14-10-14,2Br(-)) has been investigated in the temperature range from 288.2 to 308.2 K. The equilibrium concentrations of all the solubilizates are determined spectrophotometrically. The concentration of the solubilizates remains constant below the critical micelle concentration (cmc) and increases linearly with an increase in 14-10-14,2Br(-) concentration above the cmc. Compared to the mother micelle, the solubilized micelles indicate much larger hydrodynamic diameters, which are determined by dynamic light scattering. Therefore, the Gibbs energy change for the solubilization of n-alkylbenzenes has been evaluated by the partitioning of the solubilizates between the aqueous and micellar phases. Furthermore, the enthalpy and entropy changes for the solubilization could be calculated from temperature dependence of the Gibbs energy change. From the thermodynamic parameters, it is found that the solubilization for the present system is entropy-driven and that the location of the solubilizates moves into the inner core of the micelle with an elongation of their alkyl chains. The movement on the location is also supported by the results of absorption spectra, Fourier transform infrared (FTIR) spectra, and two-dimensional nuclear Overhauser effect spectroscopy (2-D NOESY).

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Section: Resultsmentioning

confidence: 99%

Section: -D Noesy Plotsmentioning

confidence: 99%

Solubilization of n-Alkylbenzenes into Gemini Surfactant Micelles in Aqueous Medium

et al. 2014

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“…The rheological properties of a viscoelastic solution are associated not only with the binding but also with the specific orientation of the added compounds . Two-dimensional NMR is a well-established technique for determining the intermolecular proximity and thus the interactions of various constituents of mixed micelles. , The 2D NOESY NMR spectra in Figure indicate significant positive cross peaks for 1% SDS/1% EBB/0.012 M 4–4–4 and 1% SDS/1% EBB/0.012 M C 6 TAB systems, representing the closeness between pairs of coupled protons. Careful analysis of these cross peaks can help pinpoint the interaction site of the hydrotropes and surfactant molecules, allowing for the determination of the average location of the hydrotrope in the micelle.…”

Section: Resultsmentioning

confidence: 99%

Nonaromatic Hydrotropic Cationic Ammonium Salts as a Rheology Modifier for an Anionic/Zwitterionic Surfactant Mixture

et al. 2014

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In this article, we report additive-induced micellar growth and rheology modification for mixtures of anionic (sodium dodecyl sulfate, SDS) and zwitterionic (N-alkylated glycine derivative, Empigen BB or EBB) surfactants. Two nonaromatic hydrotropic salts (hexyltrimethylammonium bromide, C6TAB, and/or dibutylenebis(dimethylbutylammonium bromide), 4-4-4) are used as novel additives to induce micellar growth in these systems. Nuclear magnetic resonance (NMR), photon correlation spectroscopy (PCS), transmission electron microscopy (TEM), the Weissenberg effect, and rheology measurements were employed to assess mixed micelle formation, micellar growth, and rheology modifications. Finally, the manner in which the surfactants and hydrotropes self-assemble into aggregates has also been deduced from 2D NMR NOESY measurements. In this study, both hydrotropic ions have been found to contribute to similar structural modifications in the mixed micelles of the anionic and zwitterionic surfactants. However, the extent of the rheology modification in solution is found to be quite different when the gemini hydrotrope (4-4-4) versus the monomeric hydrotrope (C6TAB) is employed.

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“…Zwitterionic surfactants are similar to gemini surfactants in that they have a dipolar head bearing both positive and negative charges, but generally only a single tail. [13][14][15][16][17][18][19][20][21][22] In general, zwitterionic surfactants are mild to skin and eyes, have low toxicity, and display excellent water solubility, high foam stability, and excellent surface tension reducing properties. 19,23,24 In combination with other surfactants, zwitterionic surfactants nd applications in laundry detergents, shampoos, and other cosmetic products.…”

Section: Introductionmentioning

confidence: 99%

m-s-m cationic gemini and zwitterionic surfactants – a thermodynamic analysis of their mixed micelle formation

McLachlan¹,

Singh

McAlduff

et al. 2020

RSC Adv.

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A conformational investigation of zwitterionic surfactants in the micelle via 13C chemical shift measurements and 2D NOESY spectroscopy

Cited by 10 publications

References 31 publications

Solubilization of n-Alkylbenzenes into Gemini Surfactant Micelles in Aqueous Medium

Solubilization of n-Alkylbenzenes into Gemini Surfactant Micelles in Aqueous Medium

Nonaromatic Hydrotropic Cationic Ammonium Salts as a Rheology Modifier for an Anionic/Zwitterionic Surfactant Mixture

m-s-m cationic gemini and zwitterionic surfactants – a thermodynamic analysis of their mixed micelle formation

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