Cou
International 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: 1246
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: 3805
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: Triturated
|
|
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: 129
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: 1574
Registered: 3-2-2014
Location: On a Big Blue Marble hurtling through space
Member Is Offline
Mood: ¡socialista!
|
|
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]
| Quote: | “Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable
views of men and things cannot be acquired by vegetating in one little corner of the earth all one’s lifetime.”
and..
“The gentle reader will never, never know what a consummate ass he can become until he goes abroad.”
Mark Twain, The Innocents Abroad |
|
|
|
Cou
International 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: 4902
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: 129
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}
