I've been assuming nearly 100% carbon,
despite kinabaloo's ideas that there might be some substantial mineral content.
I could have another go at XPS (elemental) analysis of a gunked coil/wick,
this time without cleaning it first (must be 100% 'dry' first though).
The carbon/oxygen ratio during ion-etching through the layers may
give a clue as to how close to 'just' carbon it is & whether it's mainly
elemental cabon, carbide or organic carbon
- and for the latter the relative amounts/types of oxygen bonding.
If any other elements (e.g. calcium) turn up in reasonable amount, I'll
be able to tell if these minerals are present.
(I'll discount chromium & nickel & silicon, since these will come from the coil/wick
-if I etch down that far).
Gets a bit tricky with a physically 'lumpy' sample to analyse though.
Trouble is, currently my 'worst' coil (just removed it from it's casing), only has a light deposit
(my autosmoker coil was gunking-up great, till I managed to physically break the wire - damn!)
edit: posting synchrony kinabaloo

Bookmarks