[3dem] Contaminated Quantifoil® R 1.2/1.3 + 2 nm carbon grids

[jean-marc.jeckelmann at unibe.ch]

Dear all,
we have found black-spot-contaminations on several Quantifoil® R 1.2/1.3 + 2 nm carbon grids. The gris originate from four different grid boxes containing each 100 grids per box (approximate value ~3000 CHF; most severe case see attachment).
Within the past year we tried several times to reach to Quantifoil and asked for guidance. Unfortunately, Quantifoil never provided us with an answer.
Does anybody know how to somehow “clean" these 2 nm carbon layer containing grids ?
Thanks for your input,
Jean-Marc


[cid:AC773B97-D334-48A3-AECE-40E0C3FED941]

____________________________
Jean-Marc Jeckelmann, PhD
Institute of Biochemistry and Molecular Medicine
University of Bern
Bühlstrasse 28
CH-3012 Bern
+41 31 684 3 470
jean-marc.jeckelmann at unibe.ch<mailto:jean-marc.jeckelmann at unibe.ch>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.ncmir.ucsd.edu/pipermail/3dem/attachments/20240705/40dfb0b5/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: R1.2_1.3_2nmC_Cu300_before_GD_C2-100_obj-100-df-2.5_Box_189835_image_01.jpg
Type: image/jpeg
Size: 786198 bytes
Desc: R1.2_1.3_2nmC_Cu300_before_GD_C2-100_obj-100-df-2.5_Box_189835_image_01.jpg
URL: <http://mail.ncmir.ucsd.edu/pipermail/3dem/attachments/20240705/40dfb0b5/attachment-0001.jpg>