1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

Ionic liquids: solvent properties and organic reactivity

Dimeric and oligomeric surfactants. Behavior at interfaces and in aqueous solution: a review.

Production of nanocrystalline cellulose from lignocellulosic biomass: Technology and applications

The notion of "green chemistry " has encouraged even synthetic organic chemists to include water as a solvent. Incredible selectivities and activities can be achieved through the addition of amphiphiles with a defined structure. The morphology of supramolecular assemblies or associates formed by surfactants vary according to the temperature and concentration. As a rule, reactions are typically conducted using simple spherical aggregates, that is, micelles in the nanometer range. The strong polarity gradient present between the hydrophilic surface and the hydrophobic core of the micelle means that both nonpolar and polar reagents can be solubilized. This solubilization results in reactants becoming more concentrated within the micelle than in the surrounding water phase and leads to an acceleration of the reaction and causes selective effects. The kinetic treatment of reactions in micellar systems can be accomplished by considering them as microheterogeneous two-phase systems.

Reactions in Micellar Systems

Publisher Summary This chapter discusses thermal reactions in aqueous colloidal systems. It aims is to analyze the reactions from a mechanistic point of view, and therefore discussion is focused on organic reactions in aqueous micelles. The structure of micelles or other colloidal droplets is considered only to the extent needed to understand reactivity. A key feature of micelles and similar colloidal aggregates is that they can incorporate solutes. For example an ionic micelle can bind a non-ionic solute and also, by virtue of its charge, attract counterions. It may affect reaction rates and equilibria by bringing reactants together or keeping them apart, but because the micelle can exert a medium effect it is necessary to separate the “medium” and “concentration” effects of the micelle. It reviews that the overall subject of reaction in submicroscopic aggregates has expanded so rapidly and in so many different directions that interest on specific areas has to be focused. The general principles, which govern the effects of normal, aqueous, micelles on reaction rates and equilibria are considered and some specific reactions and the relation of micellar effects to mechanism are discussed.

Gianfranco Savelli

Papers

Organic Reactivity in Aqueous Micelles and Similar Assemblies

Reactions in micelles of cetyltrimethylammonium hydroxide. Test of the pseudophase model for kinetics

Surfactant promoting effects on clathrate hydrate formation : Are micelles really involved?

Structural properties of water-ethanol mixtures: A correlation with the formation of micellar aggregates

Mercury extraction by ionic liquids: temperature and alkyl chain length effect