Liquids silicon

Figure Al.3.29. Pair correlation and structure factor for liquid silicon from experiment [41],...

The early 1980s saw considerable interest in a new form of silicone materials, namely the liquid silicone mbbers. These may be considered as a development from the addition-cured RTV silicone rubbers but with a better pot life and improved physical properties, including heat stability similar to that of conventional peroxide-cured elastomers. The ability to process such liquid raw materials leads to a number of economic benefits such as lower production costs, increased ouput and reduced capital investment compared with more conventional rubbers. Liquid silicone rubbers are low-viscosity materials which range from a flow consistency to a paste consistency. They are usually supplied as a two-pack system which requires simple blending before use. The materials cure rapidly above 110°C and when injection moulded at high temperatures (200-250°C) cure times as low as a few seconds are possible for small parts. Because of the rapid mould filling, scorch is rarely a problem and, furthermore, post-curing is usually unnecessary. 

Silicone-based release agents, although extremely effective in their designed function, can be a real hazard if used incorrectly. Through-transfer to rubber surfaces during cavity loading will destroy any attempt at bonding to other substrates. The liquid silicones are often supplied as water emulsions. 

Figure 5.2. Gel permeation chromatogram (GPC) of the liquid silicon precursor for Si film formation for (a) cyclopentasilane (CPS) and (b) UV-irradiated CPS, both of which were diluted with toluene (1 vol.%) before GPC measurements. The UV-irradiation conditions were 405 nm, 100mW/cm2, and a 10-min irradiation for 1cm3 of CPS. The broad peak around Mw = 2600 corresponds to polysilanes of various molecular weights, as a result of the photo-induced polymerization of CPS. [Reproduced with permission from Ref. 10. Copyright 2006 Nature Publishing Group.]...

FORMING SILICON FILMS FROM THE LIQUID SILICON MATERIALS... 

Figure 5.9. The concept of making an oxide film from liquid silicon materials.

Tanaka, H. et al. 2006. Solution-processed silicon films and transistors using novel liquid silicon materials. Digest of Technical Papers AM-FPD 06. pp. 27-30. 

Forming Silicon Films from the Liquid Silicon Materials 134... 

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