Microfluidic Behavior of Alumina Nanotube-Based Pathways
within Hydrophobic CNT Barriers
Posted on 2020-07-24 - 14:34
The
use of porous micro-and nanostructured materials within microfluidic
devices results in unique fluid transport characteristics. In this
paper, we investigate the microfluidic behavior of hybrid alumina
nanotube-based pathways within the hydrophobic carbon nanotube (CNT)
barriers. These hybrid systems provide unique benefits for potential
liquid transport control in porous structures with real-time sensing
of fluids. In particular, we examine how the alignment of the alumina
nanostructures with high internal porosity enables increased capillary
action and sensitivity of detection. Based on the Lucas and Washburn
model (LW) and the modified LW models, the microfluidic behavior of
these systems is detailed. The time exponent prediction from the models
for capillary transport in porous media is determined to be ≤0.5.
The experimental results demonstrate that the average capillary rise
in the nanostructured media driven by a capillary force follows t0.7. The hydrophilic/electrically insulating and hydrophobic/electrically
conductive patterned structures of the device are used for electronic
measurements within the microfluidic channels. The device structure
enables the detection of fluid samples of very low analyte concentrations
(1 μM) that can be achieved due to the very high surface area
of the hybrid structure combined with the electrical conductivity
of the CNT support structure.
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Aksu, Cemile; Bradford, Philip D.; Jur, Jesse S. (2020). Microfluidic Behavior of Alumina Nanotube-Based Pathways
within Hydrophobic CNT Barriers. ACS Publications. Collection. https://doi.org/10.1021/acs.langmuir.0c01096
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AUTHORS (3)
CA
Cemile Aksu
PB
Philip D. Bradford
JJ
Jesse S. Jur