Cou
National Hazard
Posts: 958
Registered: 16-5-2013
Member Is Offline
Mood: Mad Scientist
|
|
Help I don't know how to get or make a cannula (double-ended needle) for cannula transfer
i'm almost ready to start doing air-free techniques for the grignard reaction. i've bought everything i need, except for the nitrogen cylinder and a
cannula.
Could I buy thin vinyl tubing at home depot, and use zip-ties to attach hypodermic needles to both ends?
[Edited on 11-7-2020 by Cou]
|
|
|
MadHatter
International Hazard
Posts: 1339
Registered: 9-7-2004
Location: Maine
Member Is Offline
Mood: Enjoying retirement
|
|
eBay
Link: https://www.ebay.com/itm/1-Pack-Westmed-0194-Adult-Cannula-w...
Reasonable: $2.99 free shipping. Just get your needles.
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
|
|
|
Texium
Administrator
Posts: 4581
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
Good all-stainless steel ones are sold here: https://www.thomassci.com/Laboratory-Supplies/General-Purpos...
They’re kinda expensive though: in the ballpark of $30-50 depending on what gauge/length you want. I would recommend 18 or 20 gauge.
|
|
|
Swinfi2
Hazard to Others
Posts: 131
Registered: 19-2-2018
Location: England
Member Is Offline
Mood: Catalytic
|
|
Can you get a very long needle? You would need one like 20cm long minimum and cut it off close to the base, sharpen both ends so their are 3 points, 1
for gas pressure and the long piece. Bend the needle into a u shape but avoid kinks, pierce both septums and while holding the needle use gas pressure
to push the liquid to the second container.
Less dead space, can be flame dried.
I suppose that needs more regulated gas pressure which could cause issues.
|
|
|
arkoma
Redneck Overlord
Posts: 1761
Registered: 3-2-2014
Location: On a Big Blue Marble hurtling through space
Member Is Offline
Mood: украї́нська
|
|
you live in Texas. Feed store. all the needles you could ever use. cheap and disposable.
*edit* semi-jealous. Have a N2 cylinder and regulator, but not stepped up to Grignards yet. Be awaiting your write-ups.
[Edited on 11-8-2020 by arkoma]
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
|
|
|
Cou
National Hazard
Posts: 958
Registered: 16-5-2013
Member Is Offline
Mood: Mad Scientist
|
|
I don't have an N2 cylinder and regulator yet. Not yet sure how I would hook them up to a schlenk line. You can buy cylinders and regulators in person
at a welding store, right? and connect the cylinder to a male 1/4 barb to lead it to a schlenk line?
Edit: it may not be until like jan 2021 that I will be doing home grignard reactions. A lot of equipment is from china and is taking a long time to
ship.
[Edited on 11-8-2020 by Cou]
|
|
|
unionised
International Hazard
Posts: 5126
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
Get some thin stainless steel tubing and file each end to a point.
|
|
|
Swinfi2
Hazard to Others
Posts: 131
Registered: 19-2-2018
Location: England
Member Is Offline
Mood: Catalytic
|
|
It was a schlenk I was using, I think it was just an oil lock on the outlet to prevent overpressure and show gas flow. Iirc it was just a case of
cracking the valve carefully.
Was a good few years back so its a little fuzzy.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
