Figure 4
From: Microscale Liquid Transport in Polycrystalline Inverse Opals across Grain Boundaries
Visualization and illustration of microfluidic transport in polycrystalline inverse opals showing individual grain domains and grain boundaries. (a) A still photo of a vertically placed copper IO wicking up liquid from a reservoir. Due to grain boundary defects, propagated height through each grain column varies across the width of the sample. The average of the general propagated height is determined as the effective capillary rise h eff . See Supplementary Movie for the details. (b) The illustration of individual grain domains and grain boundaries. The capillary rise h ij within individual grain ij can also be obtained as a function of time t ij . The observation suggests that the wicked liquid can transverse around the micro-obstruction defects. (c) Microscopic image showing individual crystalline domains separated by a set of transverse and longitudinal grain boundaries. The scale bar is 100 µm.
