Inorganic matrix compounds

The determination of an inorganic analyte in an inorganic matrix, e.g. aluminium in rocks, requires the use of classical methods of separation, possibly complexation and a final determination which is designed to remove the effect of interferents by use of a specific chemical reaction(s) or spectrophotometric measurement at a wavelength which is specific to the analyte to be determined. Even so, the ability of this approach to eliminate interference from other elements (or compounds) must be established. 

Heteropolyacids are frequently used to modify proton-conducting composites,or they are just dispersed in inert matrixes.However, because the proton conduction mechanism of such hydrated salts is similar to those of hydrated polymeric sys-tems, these composites show qualitatively similar transport properties. The same is true for organically modified inorganic layered compounds such as titanium phosphate sulfophenylenphosphonate, the conductivity of which is dependent on the RH value, in a manner similar to that observed with Nafion. ... 

In order to combine the strength of an inorganic matrix with the selectivity and chemical inertness of organic resins, polymers immobilized on silica gel have been developed. The polymers may be coated on the silica surface, with or without the use of an interphasing alkylsilane.13 Alternatively the silica pores may be filled with the polymer network. This type of compounds was reviewed by Petro and Berek.14... 

We can approach the problem in three stages. First, we try to reconstruct the physical conditions during condensation (temperature, pressure, time) from the clues contained in the inorganic matrix of the meteorite. Next, we determine the condensation behavior of carbon under these conditions, on the basis of thermodynamic calculations. Finally, we perform model experiments on the condensation of carbon, and compare the compounds synthesized with those actually found in meteorites. 

Another type of inorganic matrix that is similar to controlled-pore glass but considerably less expensive can be prepared by fusing inorganic compounds such as finely pulverized silica and zirconium oxide to form a porous body. Although the pore distribution is less imiform, the surface composition is almost imiform in the case of silica, the surface is nearly 100% silica. Controlled-pore... 

A common pigment used in many plastics application is titanium dioxide, TiOa. The pigment is a very effective light scattering inorganic oxide for the coloration and protection of plastic articles. TiOa is also an insoluble material within a polymer matrix that has the ability to adsorb other materials within the matrix. Additionally, a Ti02 particle can catalyze the formation of chromophores from additive deactivation. This paper describes the adsorption behavior of several TiOi materials compares the rate of chromophore formation in a polyethylene matrix compounded. 

---