Water self-diffusion in nonionic surfactant solutions. Hydration and obstruction effects

Nilsson, Per; Lindman, Bjoern

doi:10.1021/j100246a041

Cited by 232 publications

(215 citation statements)

References 3 publications

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“…The surfactant layer curvature is changed to more positive in the H 1 -I 1 transition and to less positive in the H 1 -L a transition. The water molecules hydrated to the poly(oxyethylene) chain decreases with the increase in the C 12 EO 8 concentration in water (16). Consequently, the effective volume of the hydrophilic chain of C 12 EO 8 decreases and also the repulsion between neighboring hydrophilic chains decreases, which reduces the highly positive curvature.…”

Section: Determination Of Phase Diagramsmentioning

confidence: 99%

Effect of Addition and Molecular Size of Triglyceride Oils on Phase Behavior and Surfactant Self-Assemblies

Aramaki

Khalid

2004

J. Oleo Sci.

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Section: Determination Of Phase Diagramsmentioning

confidence: 99%

Effect of Addition and Molecular Size of Triglyceride Oils on Phase Behavior and Surfactant Self-Assemblies

Aramaki

Khalid

2004

J. Oleo Sci.

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“…For a non-compressible solute PI = 0, hence eq. [7] becomes Equation [7] can be rearranged as and used for compressible solutes. The left hand side of eqs.…”

Section: Ultrasonic Inter$erometrymentioning

confidence: 99%

“…have been mostly used for this purpose. Nuclear magnetic resonance studies (7,8) have also been found suitable. We have used conductometry, ultrasonic interferometry, and near-ir spectrophotometry as experimental approaches.…”

mentioning

confidence: 99%

Hydration studies on some polyhydroxy non-electrolytes and non-ionic surfactants

Moulik¹,

Gupta²,

Das³

1989

Can. J. Chem.

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The hydration numbers of some polyhydroxy non-electrolytes and polyoxyethylenated non-ionic surfactants have been determined and found to depend considerably on the method used, the general order being conductometry < ultrasonic interferometry < ir, spectrophotometry. PEG and Tx-100 are exceptions to this trend. The results from ultrasonic interferometry study strongly depend on the data treatment. The maximum hydration obtained using the ir method shows fair agreement with recent nmr and low angle light scattering results on similar compounds. The results indicate the existence of both strongly and loosely bound water molecules with the micelles as well as the penetration of water in the non-polar micellar region.Key words: hydration, non-electrolytes, non-ionic surfactants, conductometry, ultrasonic, near infrared. Chem. 67,356 (1989).On a determink les nombres d'hydratation de quelques composCs non-tlectrolytes polyhydroxylCs et de quelques agents de surface non-ioniques polyoxyCthylCnCs et on a trouvC que ces valeurs dipendent grandement de la mCthode utiliske pour les dkterminer et que I'ordre gCnCral est le suivant : conductimCtrie < interfCromCtrie ultrasonique < spectrophotomCtrie ir. Le PEG et le Tx-100 sont des exceptions a cette tendance. Les rksultats obtenus a l'aide de I'interfCromCtrie ultrasonique dkpendent beaucoup de la f a~o n dont les donnCes sont traitCes. L'hydratation maximale qui est rtalisCe par la mCthode ir prksente une bonne corrClation avec celle obtenue rtcemment par rmn et par diffusion de la lumiere sur des composCs semblables. Les rCsultats suggerent l'existence de molCcules d'eau tant fortement que faiblement liCes aux micelles ainsi que la pCnCtration de l'eau dans la region non-polaire de la micelle.Mots clbs : hydratation, non-Clectrolytes, agents de surface non-ioniques, conductimCtrie, ultrasonique, infrarouge proche.[Traduit par la revue]Ions and non-polar molecules interact with water so that the molecules of the latter get attached to the former, lose their identity from the bulk water and ultimately yield separate kinetic entities. Polyhydroxy compounds readily hydrate and non-ionic surfactants with polyhydroxy groups are solubilised in water through hydration at their available hydroxy centres. The outer mantle of the micelle is protected through hydration, their microscopic properties such as catalysis, local viscosity, solubilisation etc. are functions of hydration and the vicinal water structure. In our effort to characterise micelles and polyhydroxy compounds in aqueous medium we have been interested in their hydration behaviour (1, 2). Informations on small hydroxy non-electrolytes are available but those on relatively large molecules are rather meager. Different methods (3-6) such as viscosity, diffusion, light scattering, etc. have been mostly used for this purpose. Nuclear magnetic resonance studies (7, 8) have also been found suitable. We have used conductometry, ultrasonic interferometry, and near-ir spectrophotometry as experimental approaches. In some recen...

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“…Correspondingly, when large particle interactions are significant (e.g., in highly concentrated solutions) and cannot be ignored (e.g., in cell cytoplasm), this corresponds to a complicated many body problem [31]. In this situation, the diffusive path of smaller molecules (e.g., water, glucose) increases as they have to diffuse around the larger and generally irregularly shaped and tumbling "obstructing" molecules (e.g., macromolecular components of cell cytoplasm) [6,20,49]. Magnetic field gradient based NMR diffusion measurements [e.g., the pulsed gradient spin-echo method (PGSE)] are noninvasive in nature and do not disturb the thermodynamics of the system [17,27,[50][51][52][53].…”

Section: Theoretical Background Diffusion Measurements Of Associatingmentioning

confidence: 99%

Macromolecular crowding studies of amino acids using NMR diffusion measurements and molecular dynamics simulations

et al. 2015

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Molecular crowding occurs when the total concentration of macromolecular species in a solution is so high that a considerable proportion of the volume is physically occupied and therefore not accessible to other molecules. This results in significant changes in the solution properties of the molecules in such systems. Macromolecular crowding is ubiquitous in biological systems due to the generally high intracellular protein concentrations. The major hindrance to understanding crowding is the lack of direct comparison of experimental data with theoretical or simulated data. Self-diffusion is sensitive to changes in the molecular weight and shape of the diffusing species, and the available diffusion space (i.e., diffusive obstruction). Consequently, diffusion measurements are a direct means for probing crowded systems including the self-association of molecules. In this work, nuclear magnetic resonance (NMR) measurements of the self-diffusion of four amino acids (glycine, alanine, valine and phenylalanine) up to their solubility limit in water were compared directly with molecular dynamics simulations. The experimental data were then analyzed using various models of aggregation and obstruction. Both experimental and simulated data revealed that the diffusion of both water and the amino acids were sensitive to the amino acid concentration. The direct comparison of the simulated and experimental data afforded greater insights into the aggregation and obstruction properties of each amino acid.

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Water self-diffusion in nonionic surfactant solutions. Hydration and obstruction effects

Cited by 232 publications

References 3 publications

Effect of Addition and Molecular Size of Triglyceride Oils on Phase Behavior and Surfactant Self-Assemblies

Effect of Addition and Molecular Size of Triglyceride Oils on Phase Behavior and Surfactant Self-Assemblies

Hydration studies on some polyhydroxy non-electrolytes and non-ionic surfactants

Macromolecular crowding studies of amino acids using NMR diffusion measurements and molecular dynamics simulations

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