In the case of 'Nile Red's' video the red contamination is almost 100 % due to reaction of chlorine or SiCl<sub>4</sub> with the sealant
at the entry and/or exit of the reaction tube. Using rubber/plastic at these points, especially the exit, is really asking for trouble: use glass or
teflon joints there.
Nile Red' would also have done better to start heating at the left hand side of the Si, then gradually move heat (burner) to the right, to get much
higher yield. Doing so would exploit the considerable heat of reaction to heat the silicon to the right of the reaction front. Despite those flaws
it's a nice experiment.
[Edited on 9-10-2015 by blogfast25] |