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![[Figure 1]](fv5129fig1mag.jpg)
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Figure 1
(Top) Schematics of running microfluidic devices by (a) injection and (b) withdrawal. (Bottom) Schematics of the channel designs used in this work. (Left) The diverging-flow device, featuring a tight central pore space surrounded by a looser pore space, where flow is directly infused into the pore space. (Right) Three different pore spaces with matching porosity bracketed by flow channels. Solutes enter the pore space via transverse mixing. The leftmost space is adjusted from the tight pore space in the diverging-flow device by adjusting the size of the interstitial posts. The middle space is derived from the tight pore space in the diverging-flow device by randomizing the locations and morphology of the posts. The rightmost space is derived from a CT scan of Berea sandstone and modified to match the target porosity (Boek & Venturoli, 2010  ). |
![[Figure 1]](fv5129fig1.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
