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Author: Subject: Constructing a Hershberg stirrer
12thealchemist
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[*] posted on 23-10-2019 at 01:16
Constructing a Hershberg stirrer


I've just started a PhD in a new group, and we want to construct a Hershberg stirrer for making sodium sand. However, my PI has been unable to find any information regarding the construction of one. On this forum, there is this post, with associated paper. However, we're after the unmodified version if possible. Does anyone know anything about the construction of Hershberg stirrers?



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Sulaiman
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[*] posted on 23-10-2019 at 02:14


This is the first I've heard of a Hershberg stirrer so I can't help,
but
I use one of these https://www.ebay.co.uk/itm/PTFE-Mixer-Stirrer-Shaft-Stirring...
with one of these https://www.ebay.co.uk/itm/PTFE-Stopper-Plug-for-PTFE-Stirri...

They are very sturdy and can mix almost anything.
The pure ptfe blades are hinged for entry via a narrow neck,
and are easy to shape with a knife or to drill holes through.
The seal is a single rubber O-ring and I've not tried the seal against a vacuum so I can't comment on that.




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Praxichys
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[*] posted on 23-10-2019 at 04:17


Just watch your hair!
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bobm4360
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[*] posted on 23-10-2019 at 12:31


http://www.orgsyn.org/demo.aspx?prep=cv2p0116#Note57N1
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Steam
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[*] posted on 23-10-2019 at 13:17


Here is a quick paper I pulled from ACS. Seems simple enough to construct- especially if you use a stainless shaft instead of glass.

Attachment: modifiedhershberg.pdf (445kB)
This file has been downloaded 63 times





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S.C. Wack
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[*] posted on 23-10-2019 at 13:25


Hershberg had a chapter in the 1941 Fieser and his stirrer is shown there as well, but the OS picture speaks for itself. Obviously shaking would be simpler.



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12thealchemist
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[*] posted on 24-10-2019 at 01:05


Has anyone made one themselves, or got a photograph of one? Apparently, my PI wants a photograph and isn't satisfied with the diagram that is readily available on Google or the modified Hershberg paper.



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Sulaiman
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[*] posted on 25-10-2019 at 17:26


There is a photograph here in the file attached to the post by not_important
http://sciencemadness.org/talk/viewthread.php?tid=8991


Untitled.jpg - 81kB




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[*] posted on 25-10-2019 at 22:01


just a thought.you can just make them as a whole unit no need for magnetic joint. watch the thought emporium https://www.youtube.com/channel/UCV5vCi3jPJdURZwAOO_FNfQ
as he make PTFE joint and seals stuff.



hs1.jpg - 571kB

hs.jpg - 113kB

[Edited on 26-10-2019 by rockyit98]




far as i know everything is trying to be an equilibrium.
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