%0 Journal Article
%A Lee, Jonggyu
%A Suh, Youngjoon
%A Dubey, Pranav P.
%A Barako, Michael T.
%A Won, Yoonjin
%D 2018
%T Capillary
Wicking in Hierarchically
Textured Copper Nanowire Arrays
%U https://acs.figshare.com/articles/journal_contribution/Capillary_Wicking_in_Hierarchically_Textured_Copper_Nanowire_Arrays/7528823
%R 10.1021/acsami.8b14955.s001
%2 https://acs.figshare.com/ndownloader/files/13998371
%K fluid delivery
%K nanowire arrays
%K 1000 nm length scale
%K capillary wicking materials
%K 100 nm length scale
%K length scales
%K Hierarchically Textured Copper Nanowire Arrays Capillary wicking
%K surface
%K media
%K capillary performance parameters
%X Capillary wicking
through homogeneous porous media remains
challenging to simultaneously optimize due to the unique transport
phenomena that occur at different length scales. This challenge may
be overcome by introducing hierarchical porous media, which combine
tailored morphologies across multiple length scales to design for
the individual transport mechanisms. Here, we fabricate hierarchical
nanowire arrays consisting of vertically aligned copper nanowires
(∼100 to 1000 nm length scale) decorated with dense copper
oxide nanostructures (∼10 to 100 nm length scale) to create
unique property sets that include a large specific surface area, high
rates of fluid delivery, and the structural flexibility of vertical
arrays. These hierarchical nanowire arrays possess enhanced capillary
wicking (K/Reff = 0.004–0.023
μm) by utilizing hemispreading and are advantageous as evaporation
surfaces. With the advent and acceleration of flexible electronics
technologies, we measure the capillary properties of our freestanding
hierarchical nanowire arrays installed on curved surfaces and observe
comparable fluid delivery to flat arrays, showing the difference of
10–20%. The degree of effective inter-nanowire pore and porosity
is shown to govern the capillary performance parameters, thereby this
study provides the design strategy for capillary wicking materials
with unique and tailored combinations of thermofluidic properties.
%I ACS Publications