In response I felt I had to post the low-tech version (not mine) Phil
At Elspeth's request, here's a link to a picture of the rack we use for
drying out shipping dewars.
https://www.dropbox.com/s/8ber2iikra9x73y/2013-02-21%2013.39.38.JPG
Very simple and both we and the Lea group here have found it to make a
huge difference the the effectiveness and longevity of our dewars.
Ed.
--
Dr. E.D. Lowe
Department of Biochemistry
University of Oxford
South Parks Road
Oxford, UK
OX1 3QU
e:[email protected]
t: +44 (0) 1865 613288
f: +44 (0) 1865 613201
On 12/07/2013 14:27, "Edward Snell" <[email protected]> wrote:
Ditto - I was always impressed with the contraption in the Garman lab
which, if I remember correctly, is made of a thick block of wood and some
plumbing pipes. It is designed to hold empty open Dewars inverted so they
could dry.
Edward Snell Ph.D.
Assistant Prof. Department of Structural Biology, SUNY Buffalo,
Senior Scientist, Hauptman-Woodward Medical Research Institute
700 Ellicott Street, Buffalo, NY 14203-1102
Phone: (716) 898 8631 Fax: (716) 898 8660
Skype: eddie.snell Email: [email protected]
Telepathy: 42.2 GHz
Heisenberg was probably here!
-----Original Message-----
From: CCP4 bulletin board [mailto:[email protected]] On Behalf Of
Ginell, Stephan L.
Sent: Friday, July 12, 2013 12:45 AM
To: [email protected]
Subject: Re: [ccp4bb] frosted crystals during storage in pucks
My experience with xtals frosting in LN2 either in a dewar, while
freezing, or in pucks, has been because the LN2 was contaminated with ice
crystals The fog you see above your dewar when freezing xtals is frozen
water vapor...it will fall and collect in the LN2 and also deposit on the
xtals. Dewars filled with recycled LN2 get contaminated with ice. Dewars
dried upside down allow the cold gas to flow out and warm moist air to
flow in and the water to condense inside the dewar (basic physics). To
dry shipping dewars keep up right while warming.
Steve
Sent from my iPad
On Jul 11, 2013, at 5:25 PM, "Nathaniel Clark"
<[email protected]<mailto:[email protected]>> wrote:
At our last synchrotron trip, the beamline staff suggested that the
problem was due to moisture accumulation in the dry shipper. They
recommended storing them inverted (for a few weeks, if I recall), and/or
putting a supply of dry air in the dewer. Haven't tried it yet!
Nat
On Thu, Jul 11, 2013 at 5:08 PM, <Rain Field>
<[email protected]<mailto:[email protected]>> wrote:
Hi All,
We found if the crystals are storaged in pucks for 3-4 days in shipping
dewar (with liquid nitrogen), they are almost frosted.
Although I can wash them with liquid nitrogen, but it's not convenient to
do that for each crystals.
I doubt it's because the humid air in North West America.
Does anyone has an idea how to avoid this?
Thank you!
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