Metal oxides colloidal

Other quite different assemblies can be formed, e.g., colloidal silica, metal oxides, colloidal metals, etc. They have many properties that are reminiscent of micelles, while also having specific features of their own. These systems will not be discussed. 

Colloids. Colloids include particles with hydrophobic, hydrophilic and intermediate forms with a size range 1 - 400 nm. Both organic (including macromolecules) and inorganic (hydrolyzed silica and metal oxides) colloids occur in the marine environment (Sigleo and Helz, 1981). Their surfaces often contain suitable sites for interactions with trace metals (adsorption, complexation). In the marine environment all particles have a negative surface charge (Neihof and Loeb, 1972 Hunter and Liss, 1982). Increase of the electrolyte concentration decreases the stability of the colloidal particles. As a result the... 

Metal oxide colloids have been effectively coupled with multifunctional ligands containing carboxyl groups that bind to the surface of nanoparticles [46]. One can rationally design optimal photocatalysts by tailoring functional groups for selective adsorption of specific... 

Since then, other colloidal oxide systems have been investigated in order to prepare ceramic mesoporous membranes designed for ultrafiltration. The preparation of an electronically conductive membrane from a Ru02 Ti02 mixed oxides sol and the application to an electro-ultrafiltration process [25,26], as well as the preparation of titania and zirconia ultrafiltration membranes [27], have been described following a colloidal process in which a partial destabilization of a metal oxide colloidal suspension is used to produce top layers with different pore size and pore volume in the mesoporous range. In agreement... 

Jayaweera, P., Hettiarachchi, S., and Ocken, H., Determination of the high temperature zeta potential and pH of zero charge of some transition metal oxides. Colloids Surf. A, 85, 19, 1994. 

Crawford, R.J., Mainwaring, D.E., and Harding, I.H., Adsoiption and coprecipitation of heavy metals from ammoniacal solutions using hydrous metal oxides. Colloids Surf. A, 126, 167, 1997. 

Size-selective Synthesis of Nanostructured Metal and Metal Oxide Colloids and Their Use as Catalysts... 

Wolfgang Pauli was back with another report on the careful synthesis and characterization of soluble metal-oxide colloids. His lecture was entitled The General Structure of Colloids. While Pauli moved on to other fields where he succeeded brilliantly (Nobel, 1945), his contributions to colloid science were important and established high standards. 

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