Dynamics of surfactant

Surfactant solutions critical micelle concentration distribution of reactants among particles surfactant aggregation numbers interface properties and polarity dynamics of surfactant solutions partition coefficients phase transitions influence of additives... 

Lobovkina T, Dommersnes P, Joanny JF, Hurtig J, Orwar O (2006) Zipper dynamics of surfactant nanotube Y junctions. Phys. Rev. Lett. 97 188105. 

Zana R. Dynamics of surfactant self-assemblies micelles, microemulsions, vesicles, and lyotropic phases. New York CRC Press 2005. 

Trokhymchuk A, Henderson D, Nikolov A, Wasan D (2005) In-layer structuring of like-charged macroions in a thin film. Ind Eng Chem Res 44 1175-1180 Von Bahr M, Tiberg F, Zhmud BV (1999) Spreading dynamics of surfactant solutions. Langmuir 15 7069-7075... 

Zana, R. (ed.), Dynamics of Surfactant Self-Assemblies Micelles, Microemulsions, Vesicles and Lyotropic Phases. CRC New York, 2005. 

The formation mechanism of this family of materials is determined by two features [45], The first is the dynamics of surfactant molecules to shape molecular assemblies, which leads to micelle, and, ultimately, liquid crystal formation. The second is the capability of the inorganic oxide to undergo condensation reactions to form extended, thermally stable structures. 

Engels, Th., von Rybinski, W. andSchmiedel, R (1998) Structure and dynamics of surfactant-based foams. Progr. Colloid Polym. Sci, 111, 117-26. 

The dynamics of surfactant molecules in micelles can also be studied by various NMR methods such as H and 13C chemical shift, band shape, relaxation... 

Haller T, Ortmayr J, Friedrich F et al (1998) Dynamics of surfactant release in alveolar type II cells. Proc Nad Acad Sci U S A 95(4) 1579-1584... 

In order to optimize the use of surfactants, specific knowledge of their dynamic adsorption behaviour rather than their equilibrium properties is of great interest [17]. Hence, it is necessary to describe the dynamics of surfactant adsorption at a fundamental level. 

Excited triplet xanthone was initially employed as a probe molecule to study the dynamics of surfactant aggregated to polyelectrolytes [186]. Triplet-triplet absorption spectra were obtained 40 ns and 1 ps after the laser pulse, and a blue shift was observed. These two spectra were ascribed respectively to xanthone within the macroassembly and in the aqueous phase. Quenching experiments were carried out where the probe residing in the aqueous phase was quenched, whereas that in the self-assembly was protected. The xanthone dissociation rate constant from the aggregates was 1.1 x 10 s" [186]. 

Chapters 26—29 all discuss hydrodynamic aspects of emulsified systems. The contribution by Danov, Kralchevsky, and Ivanov presents a very fundamental and thorough survey of different phenomena in emulsions related to dynamic and hydrodynamic motions, such as the dynamics of surfactant adsorption mono-layers, which include the Gibbs surface elasticity, and characteristic time of adsorption, mechanisms of droplet-droplet coalescence, hydrodynamic interactions and drop coalescence, interpretation of the Bancroft rule with regard to droplet symmetry, and, finally, kinetics of... 

In a spraying process, a liquid is forced through an orifice (the spray nozzle) to form droplets by the application of hydrostatic pressure. The effect of surfactants and/or polymers on the droplet size spectrum of a spray can be described in terms of their effects on the surface tension. Since surfactants lower the surface tension of the liquid, one would expect that their presence in the spray solution would result in the formation of smaller droplets. However, when considering the role of surfactants in droplet formation, one should consider the dynamics of surfactant adsorption at the air/liquid interface. In a spraying process, a fresh liquid surface is continuously being formed. The surface tension of this... 

Krebs T, Schroen K, Boom R (2012) Coalescence dynamics of surfactant-stabilized emulsions studied with microfluidics. Soft Matter 8(41) 10650-10657... 

Handbook of Detergents, editor in chief Uri Zoiier Part C Anaiysis, edited by Heinn ch Waidhoff and Rudiger Spiiker Mixed Surfactant Systems Second Edition, Revised and Expanded, edited by Masahiko Abe and John F. Scamehorn Dynamics of Surfactant Seif-Assembiies Miceiies, Microemuisions, Vesicies and Lyotropic Phases, edited by Raoui Zana... 

The structure and dynamics of surfactant and polymer chains in intercalated poly(8-caprolactone)/ clay nanocomposites are characterized by P magic-angle spinning (MAS) and C cross-polarization MAS NMR techniques. To obtain hybrid materials with the low polymer content required for this study, in situ intercalative polymerization was performed by adapting a published procedure. After nanocomposite formation, the chain motion of the surfactant is enhanced in the saponite-based materials but reduced in the laponite ones. Compared to the initial clay, the trani -conformer population of the surfactant hydrocarbon chains in the nanocomposite decreases for the saponite systems. Mobility of the polymer chain is higher in the nanocomposites than in the bulk phase. The charge of the modified saponite does not significantly inflnence chain mobility in the nanocomposites. 

For a reactant molecule or ion in a micellar solution or microemulsion, predictions of electron transfer kinetics at electrodes need to consider [14] (1) the distance between the electrode and the reactant, (2) the environment surrounding the reactant at the time of electron transfer, (3) structure and dynamics of surfactant aggregates on the electrode, and (4) dynamics of interactions of the reactant with surfactant structures on the electrode and with micelles. A molecular picture of these events during electron transfer is by no means clear, and quantitative predictions are not possible at this time. A qualitative view of the above factors is given in the following paragraphs. 

R. Zana, Dynamics of Surfactant Self-Assembly Micelles, Microemulsions, Vesicles, and Lyotropic Phases, Vol. 125, CRC Press, Boca Raton, 2005. 

Zana, R. 2005. In Dynamics of surfactant assemblies. Vol. 125. Ed. R. Zana. Boca Raton, FL Taylor Francis. 

The structure and dynamics of surfactant and polymer chains in intercalated poly(6-caprolactone)/clay nanocomposites are characterised by P MAS and C CP MAS NMR. " ... 

Dynamics of Surfactant Self-Assemblies Micelles, Microemulsions,... 

The projects discussed in Section 20.2 have been centred around the spectroscopic probing of the structure and dynamics of surfactant systems and lyotropic mesophases, in particular hydrocarbon gels. Three related investigations not yet discussed in detail due to limitations in space shall be briefly mentioned. These are the study of the conformation of surfactant molecules by surface enhanced Raman spectroscopy, the development of a lipophilic dye probe for surfactant systems, and an outlook onto a different class of reaction gels created by hydrolysis of metal alkoxide precursors. 

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