X-ray imaging
X-ray CT was performed using two scanners, both accessed at the UCL
Electrochemical Innovation Laboratory. To image dried gyroid samples a
ZEISS Xradia Versa 620 (Pleasanton, USA) with a tungsten target was
used, achieving a pixel size of 5 µm for whole sample scans and 2 µm
when performing interior tomography . A primary accelerating voltage of
40 keV and a power rating of 3 W over 2,401 projections were acquired
for each sample at a 14 s exposure time, with each scan taking 12 hours.
When visualizing internal porosity inside of the 3D printed sample a
ZEISS Xradia Ultra 810 with a chromium target was used at a fixed
accelerating voltage of 35 keV . A piece of printed material was cut to
dimensions of 1 mm and adhered atop a pinhead for imaging, as displayed
in Figure 1b. A pixel size of 63 nm was achieved for ‘Large Field Of
View’ mode and 16 nm using ‘High Resolution’ mode. A 50 s exposure time
was applied to acquire 1,601 projections per sample, with each scan
taking 24 hours.