[3DEM] dry dewar

[Jim Hogle]

In the crystallographic community we routinely ship our samples of  
crystals frozen in vitreous ice in dry dewars when we send samples to  
synchrotron sources for data collection.  Although there are  
significant differences (our samples are much thicker) we have not  
had a problem with loss of vitrification of our samples during  
shipment.  Our experiments are at least as sensitive to ice formation  
either in the vitreous sample or as water deposited on the frozen  
sample as we typically irradiate much larger areas of the sample, and  
even tiny crystals would be apparent in diffraction experiments.  If  
you have any doubts you should consider conducting a "dry run" in  
which you store samples in a dry dewar at home.

Jim Hogle


On May 30, 2006, at 10:01 AM, Benoît ZUBER wrote:

> **** Messages to this list are automatically archived ***
> **** Please limit quoting of previous postings to the bare minimum  
> ****
>
> Dear colleagues,
>
> I want to send vitreous samples in a “dry dewar”, i.e. a dewar in  
> which
> liquid nitrogen is absorbed in a porous material. Since the samples  
> are in
> gas phase, I am concerned that they always stay below the  
> devitrification
> temperature. Has anyone transported vitreous material in such a  
> dewar? Did
> the samples stay vitreous?
>
> Best regards,
> Benoît
>
> Benoît Zuber
> Université de Lausanne
> Laboratoire d'analyse ultrastructurale
> Bâtiment Biophore
> CH-1015 Lausanne
> Switzerland
>
> tel: +41 21 692 4289 ou +41 21 692 4283
> fax: +41 21 692 4285
> e-mail: Benoit.Zuber at unil.ch
>
>
>
> -- 
> For information on how to subscribe/unsubscribe/etc., send mail to
> 3dem-request at 3dem.ucsd.edu with the text "help" in the body of the
> message.
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.ncmir.ucsd.edu/pipermail/3dem/attachments/20060530/3bf04c24/attachment.html