Si-based materials

Results for the bimetallic clusters on mesoporous Si-based materials... 

Fluoropolymer processing aid concentrates can be analysed by FTIR to within 0.1% within a few min [85]. Letdown processing aid levels can be determined down to approximately 400 to 500 ppm with an accuracy of 50 ppm. It is not envisaged that FTIR will be a suitable means for analysing tracers for ownership (of defective products). Low concentrations are necessary here in order not to upset materials properties and to avoid confusion with the additive package. This rules out many aromatics, S and P compounds. Si-based materials. Cl and Br compounds, elements found in colourants (Ti, Ba, Ca, etc.) as well as other elements (e.g. Zn) and various functional groups (COOH, etc.). 

This section reports a room temperature, one-step hydrosilation reaction for the synthesis of a siloxane-vinylbenzene hybrid copolymer. This process supersedes other thermal polymerization methods used for vinyl monomers. An alternating ABAB-type polymer from TMDS and divinyl monomers provides a route to a wide variety of Si-based materials that are thermally stable in the oxygen free atmosphere... 

The terminal alloy is Li22M5, with a theoretical capacity of about 1600 mAh/g. Compared with Si-based materials, Ge exhibits a higher diffusivity for lithium ions (about 400 times greater than that in silicon at room temperature) and a lower specific volume change during the Li insertion/extraction process, which is expected to present better cycling performance at comparable capacity, and therefore shows promise as a negative electrode material for lithium-ion batteries. 

---