Surfactants at solid-liquid interfaces

Manne S and Gaub FI E 1995 Molecular organization of surfactants at solid-liquid interfaces Science 270 1480-3... 

The fluorescence decay of pyrene in the presence of nonionic surfactants at solid-liquid interface is influenced by the polar... 

S. Manne, H. E. Gaub, Molecular Organization of Surfactants at Solid-Liquid Interfaces , Science 1995,270,1480-1482. 

Figure 4 Progression of aggregate microstructures for single ionic surfactants beyond the cac. (Reprinted from Coll. Surf. A, 167, R. A. Johnson and R. Nagarajan, Modeling self-assembly of surfactants at solid liquid interfaces. I. Hydrophobic surfaces, 31 2000, with permission from Elsevier.)...

Manne, S. and Gaub, H. E., Molecular organisation of surfactants at solid-liquid interfaces. Science, 270, 1480-1482 (1995). 

Manne S., Schaffer T.E., Huo Q., Hansma P.K., Morse D.E., Stucky G.D., Aksay LA. Gemini surfactants at solid-liquid interfaces Control of interfacial aggregate geometry. Langmuir 1997 13 6382-6387... 

The adsorption of ionic surfactants on several different kinds of natural solid materials (e.g., ores, minerals, clays) is of great practical importance. Therefore, a vast and ever-expanding literature is published on this subject. Because of the complexity of interactions involved in the accumulation of ionic surfactant at solid/liquid interface from dilute aqueous solution, no single and unifying model of adsorption process for a range of solid-surfae-tant combinations has yet emerged [1, 2]. 

Manne S 1997 Visualizing self-assembly Force microscopy of ionic surfactant aggregates at solid-liquid interfaces Prog. Colloid Polym. Sol. 103 226-33... 

H.S. Hanna and P. Somasundaran, "Physico-Chemical Aspects of Adsorption at Solid/Liquid Interfaces, Part II. Berea Sandstond/Mahogony Sulfonate System", in Improved Oil Recovery by Surfactants and Polymer Flooding, D.O. Shah and R.S. Schecter, eds.. Academic Press, 1977, p. 253-274. 

Surfactants at Interfaces. Somewhat surprisingly, the successes described above in the in-situ studies of protein adsorption have not inspired extensive applications to the study of the adsorption of surfactants. The common materials used in the fabrication of IREs, thalliumbromoiodide, zinc selenide, germanium and silicon do, in fact, offer quite a range in adsorption substrate properties, and the potential of employing a thin layer of a substance as a modifier of the IRE surface which is presented to a surfactant solution has also been examined in the studies of proteins. Based on the appearance of the studies described below, and recent concerns about the kinetics of formation of self-assembled layers, (108) it seems likely that in-situ ATR studies of small molecules at solid - liquid interfaces ("wet" solids), will continue to expand in scope. 

Choi, K. S., Lichtenegger, H. C., Stucky, G. D. and McFarland, E. W. (2002). Electrochemical synthesis of nano structured ZnO films utilizing self-assembly of surfactant molecules at solid-liquid interfaces. J. Am. Chem. Soc. 124(42), 12402-12403. 

Hanna, H.S., Somasundaran, P, 1977. Physico-chemical aspects of adsorption at solid/liquid interfaces, 11 Mahogany sulfonate/Berea sandstone, kaolinite. In Shah, D.O., Schechter, R.S. (Eds.), Improved Oil Recovery by Surfactant and Polymer Flooding. Academic Press, pp. 253-274. 

Polyelectrolyte - Surfactant Interactions at Solid-Liquid Interfaces Studied with Surface Force Techniques... 

Particles or macroscopic solid surfaces are present in most of the applications mentioned above. Hence it is important to know how polyelectrolytes and surfactants interact with each other at solid-liquid interfaces. Due to the slow equilibration in many polyelectrolyte-surfactant systems, particularly at interfaces, it is fruitful to distinguish between two situations. In the first case the polyelectrolyte is initially adsorbed at the solid-liquid interface and then the polyelectrolyte is removed from the solution before the surfactant is added. This mimics the situation in many cleaning applications. Most of the studies concerned with polyelectrolyte-surfactant interactions at solid-liquid interfaces belong to this category. 

In this review we focus on polyelectrolyte-surfactant interactions at solid-liquid interfaces as studied with surface force measuring techniques. The last years have seen much progress in this area, and it is timely to recapitulate some main findings. It is, however, clear that in order to understand interfacial properties of polyelectrolyte-surfactant systems one needs to understand bulk association. Further, a multitude of experimental techniques needs to be applied. Recent advances have been made using ellipsometry [34,35], reflectometry [36,37], neutron reflectivity [38], and surface sensitive spectroscopic techniques [39,40], It is also our belief that the... 

This book deals mainly with dynamic properties of amphiphiles at liquid/air and liquid/liquid interfaces rather than at solid/liquid interfaces. However static and dynamic contact angles are discussed in Appendix 3B as these phenomena are determined by the kinetics of adsorption of surfactants also at the fluid interface. Some specific aspects of lateral transport phenomena studied by many authors are briefly review in Appendix 3D. 

The understanding of the relationships between molecular structure of tailored organic molecules, their hierarchical organization in assemblies chemically bound to surfaces and interfaces as well as their fimctionality represent fundamental topics of current interest [104,105]. hi the following we shall focus on so-called chemisorbed, self-assembled monolayers (SAM), which are distinctly different from the physisorbed, hydrogen-bonded adlayers discussed in the previous paragraph. Following a historical development we will use the terminus self-assembled monolayers herein exclusively as molecular assemblies formed by chemisorption of an active surfactant onto a solid surface [106-108]. We will specifically focus on selected results with aromatic SAMs on Au(lll) electrodes at solid-liquid interfaces. 

For optimum surfactant adsorption at solid/liquid interfaces, mixed micelles have more efficient packing, which in turn contributes to better detergency by lowering the CMC and interfacial tension. 

The fourth and fifth sections deal with amphiphiles at solid-liquid interfaces. Section four on Amphiphiles at Electrode Surfaces contains a collection of important applications. The first by Rusling illustrates how surfactant films on electrode surfaces may be fabricated to electrocatalyze a variety of reactions. Koglin and coworkers provide some exciting new surface enhanced Raman spectroscopy results that contravene some of the reigning dogma on how cationic surfactants assemble on anionic surfaces. Kaifer presents a concise review of self-... 

The adsorption of surfactants on solid-liquid interfaces is at the center of interest in colloid and surface science. The nature of interactions between the solid surface, surfactant and the solution phase need to be understood to control the adsorption of surfactants. Solid surfaces in contact with aqueous solutions, especially surfaces of clays or minertils, are frequently charged and this charge generates a potential at the solid-solution interface. The adsorption of surfactants on the solid-liquid interface quite often proceeds at an interface which is electrified. Unfortunately,... 

Visualizing self assembly force microscopy of ionic surfactant aggrogatos at solid-liquid interfaces... 

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