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Microscale Liquid Transport in Polycrystalline Inverse Opals across Grain Boundaries.

Abstract：

:Delivering liquid through the void spaces in porous metals is a daunting challenge for a variety of emerging interface technologies ranging from battery electrodes to evaporation surfaces. Hydraulic transport characteristics of well-ordered porous media are governed by the pore distribution, porosity, and morphology. Much like energy transport in polycrystalline solids, hydraulic transport in semi-ordered porous media is predominantly limited by defects and grain boundaries. Here, we report the wicking performances for porous copper inverse opals having pore diameters from 300 to 1000 nm by measuring the capillary-driven liquid rise. The capillary performance parameter within single crystal domain (K ij /R eff  = 10-3 to 10-2 µm) is an order of magnitude greater than the collective polycrystal (K eff /R eff  = ~10-5 to 10-3 µm) due to the hydraulic resistances (i.e. grain boundaries between individual grains). Inspired by the heterogeneity found in biological systems, we report that the capillary performance parameter of gradient porous copper (K eff /R eff  = ~10-3 µm), comparable to that of single crystals, overcomes hydraulic resistances through providing additional hydraulic routes in three dimensions. The understanding of microscopic liquid transport physics through porous crystals and across grain boundaries will help to pave the way for the spatial design of next-generation heterogeneous porous media.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Pham QN,Barako MT,Tice J,Won Y

doi

10.1038/s41598-017-10791-3

subject

Has Abstract

pub_date

2017-09-05 00:00:00

pages

10465

issue

1

issn

2045-2322

pii

10.1038/s41598-017-10791-3

journal_volume

7

pub_type

杂志文章

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