Self-diffusion in microemulsions and micellar size

Fedotov, V. D.; Zuev, Yu. F.; Archipov, V. P.; Idiyatullin, Z. Sh.

doi:10.1007/bf03163524

Cited by 26 publications

(16 citation statements)

References 32 publications

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“…These values of the restriction size were much greater than the actual size of the surfactant micelle, which is about 10 nm [1,2,9,18]. This restriction size indicates the biological cell size with a permeable membrane [12,13].…”

Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 92%

“…In order to estimate the hydrodynamic micellar radius from the self-diffusion data, Stokes-Einstein equation was used [9,24] kT R m ---…”

Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 99%

“…At this condition the self-diffusion obstruction may be taken into account by the model of the hard-sphere particles obstruction [9,24,25]. In this case,…”

Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 99%

“…By PFG NMR, the surfactant aggregation and molecular exchange processes on the micelle surface may be investigated by analyzing the spin-echo attenuation or diffusional der at different diffusion times. The micellar sizes are estimated from the micellar self-diffusion coefficient, and the details of the micetlar radius calculation have been discussed by Fedotov et al [9]. The self-diffusion behavior of the nonionic aqueous solution of dodecyloligoethylene oxide surfactant C~2E 5 and CI2E 8 was analyzed according to the cell-diffusion model.…”

Section: Introductionmentioning

confidence: 99%

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Structural and dynamic properties of polyoxyethylene sorbitan monooleate micelle in water dispersion studied by pulsed field gradient NMR

et al. 2005

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The diffusion phenomenon of a nonionic surfactant, polyoxyethylene sorbitan monooleate (POE-SMO), micelle in aqueous solution was investigated by pulsed field gradient nuclear magnetic resonance (PFG NMR) with a high gradient strength of 17.4 T/m at the diffusion time t d varied from 3 to 300 ms. This high gradient strength allowed us to measure the slow self-diffusion coefficient of POE-SMO micelle, and the short diffusion time below 10 ms showed the restricted diffusion of the micelle. At the short t d the self-diffusion of the miceUe was restricted and the restricted sizes were 1.8, 1.5, and 0.8 gm for the POE-SMO concentration of 100, 200 and 300 mM, respectively, and 0.6 gm for the POE-SMO only. The possible reason of this restriction was assumed to be the formation of a spatial network ora micellar clustering. Furthermore, a proton exchange between water molecule and surfactant OH group on the micelle surface was proposed. With respect to this proposal, the residence time of the proton at the micelle surface and the thickness of the surface were investigated from proton self-diffusion coefficients by PFG NMR.

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Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 92%

“…In order to estimate the hydrodynamic micellar radius from the self-diffusion data, Stokes-Einstein equation was used [9,24] kT R m ---…”

Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 99%

“…At this condition the self-diffusion obstruction may be taken into account by the model of the hard-sphere particles obstruction [9,24,25]. In this case,…”

Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural and dynamic properties of polyoxyethylene sorbitan monooleate micelle in water dispersion studied by pulsed field gradient NMR

et al. 2005

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“…These systems were already studied in our laboratory with the help of Fourier transform pulsed-gradient spin-echo 'H NMR technique [14,15]. It has been shown [15] that in the wide range of the disperse phase volume fraction we dealt with the solutions of spherical microdroplets of definite radius.…”

Section: Introductionmentioning

confidence: 99%

An electron spin resonance study of the soy bean phosphatidylcholine-based reversed micelles

et al. 1998

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The ESR spectra of I-palmitoyl-2-stearoyl-(n-doxyl)-glycero-3-phosphocholine spin label positional isomers (n = 5, 7, 10, 12 and 16) have been studied in soy bean phosphatidylcholine (SPC)-based microemulsions with various volume fractions of disperse phase over the wide temperature range. The maximum hyperfine splitting 2A... and the order parameters S were taken as indices of the rotational mobility and the motion spatial restrictions of the labeled lipid chain segments. It is found that the temperatures T,, at which sharp enhancements of 2A n, ax and S occur depend on concentration and size of the reversed micelles in solutions. To explain this, a plausible model, taking into account capability of the SPC molecule hydrocarbon chains to change a tilt angle with respect to the surface of a polar head group as temperature varies, is proposed. The estimations of the correlation times si obtained from the lineshape characteristics of the ESR spectra provided the possibility to suggest that these correlation times characterize the reorientations of the SPC chain axis about the normal to the surface of a polar head group of a reversed micelle.

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Micelle structure and molecular self‐diffusion in isononylphenol ethoxylate–water systems

Архипов

Potapova

Antzutkin

et al. 2013

Magnetic Reson in Chemistry

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The structure and dynamic properties of micellar solutions of nonionic surfactants of a series of isononylphenol ethoxylates, C9H19C6H4O(C2H4O)(n)H (where n = 6,8,9,10, and 12), were studied by NMR diffusometry, dynamic light scattering, and viscosimetry. The sizes of the micelles were determined for different surfactants and at different surfactant concentrations. The numbers of water molecules bound by a micelle and by one oxyethylene group of the surfactant were estimated.

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Self-diffusion in microemulsions and micellar size

Cited by 26 publications

References 32 publications

Structural and dynamic properties of polyoxyethylene sorbitan monooleate micelle in water dispersion studied by pulsed field gradient NMR

Structural and dynamic properties of polyoxyethylene sorbitan monooleate micelle in water dispersion studied by pulsed field gradient NMR

An electron spin resonance study of the soy bean phosphatidylcholine-based reversed micelles

Micelle structure and molecular self‐diffusion in isononylphenol ethoxylate–water systems

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