Whenever I pyrolyzed NaH2PO2, I am facing difficulties in cleaning the white left over residue (may be phosphates) in the tube.
So, I am looking for any effective cleaning protocols to get rid of this issue.
Thanks.
If its a phosphate, might be soluble in water. But if you're pyrolyzing, then you may be incorporating these into the silica in the tube. In which case, if appearance is the worry, replaceable tubes. Good luck!
Dear Nagapradeep N. , Depending on the material of tube,
i) If you are trying in Quartz tube, the white residue is Silicon phosphate which is a type of GLASS and it is to hard to remove.
ii)If you are trying in Alumina tube, the white residue is Aluminium phosphate which is similar to Zeolite in structure and it is very slightly soluble in HCl and HNO3 .
Thanks for the information Mr. Suraj.
I have been using quartz tube.
Dear Nagapradeep N. , I suffer from the same problem with polyoxometalates heating in the Quartz tube. For the reference, see Image below.
You can try with Alumina tube.
Good Luck.
Suraj, looking at that tube I can see stress cracks in there, likely from thermal expansion and contraction. I'd be extremely wary of using that tube for CVD for two reasons: Safety (tube failure) or contamination to the sample.
I'd advise buying longer tubes for cheaper, and investing in a wet-saw with a diamond abrasive wheel. You can cut tubes to length and replace as needed. Alumana tubes are good as well, but are more expensive relative to quartz, and still a pain to clean.
Best of luck on experiments!
Yes Mr. Curtis Guild
Actually, when we try for the annealing of potassium niobate, we suffer from those cracks on the tube. The niobium gets reacted with Si and forms Niobium Silicate. Those cracks are at inner surface of the tube. And cracks get propagated and unfortunately that tube get damaged.
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