The imbibition experiments in 2D and 2.5D multilayer micromodels

<p>We performed a series of imbibition experiments to examine air entrapment in 2 and 2.5 D micromodels whose pore structures were made by stacking 160-&mu;m thick Cyclic Block Copolymer films, into which pores were engraved with a desktop micromiller. The 2D micromodels consisting of n CBC layers with the same pore structure were termed &ldquo;2D-n-layer&rdquo;. &nbsp;The 2.5D micromodels consisting of n CBC layers with non-uniform pore structures were termed &ldquo;2.5D-n-layer&rdquo;.</p> <p>The &quot;mp4&quot; files show those imbibition experiments. The file names refer to the &quot;model&quot;-&quot;injection rate&quot;-&quot;playback speed&quot;. For instance, &quot;2_5D-8-layer-3ul_min_32x.mp4&quot; means 2.5D-8-layer micromodel, 3 ul/min of injection rate, and 32 times of playback speed.</p> <p>The &quot;gif&quot; files show the thickness of the wetting phase indicated by colors (thicker one indicated by a lighter color).</p>