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A method for quantifying in plane permeability of porous thin films
Guoguang Rong1, James W Palko2, Diego I Oyarzun1
1Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.
Journal of Colloid and Interface Science
|July 15, 2018
Summary
We developed a new method to directly measure in-plane permeability in porous thin films. This technique accurately quantifies fluid flow properties in various thin film materials.
Area of Science:
- Fluid Mechanics
- Materials Science
- Nanotechnology
Background:
- In-plane permeability is crucial for understanding fluid flow in porous thin films.
- Direct measurement is difficult due to the limited flow area in thin films.
Purpose of the Study:
- To develop and demonstrate a novel technique for direct in-plane permeability measurement of porous thin films.
- To overcome limitations of existing methods for thin film characterization.
Main Methods:
- A manifold pressed onto the film's surface creates a 2D flow field.
- In-situ measurements of pressure drop at fixed flow rates are used.
- Simulations analyze the flow field and extract permeability.
Main Results:
- The technique successfully measures in-plane permeability for various thin film structures.
- Measurements for periodic channels align with theoretical predictions.
- Permeability was determined for pillar arrays and porous copper films.
Conclusions:
- The proposed method is a robust tool for characterizing in-plane permeability in diverse thin films.
- The technique is applicable to films of arbitrary thickness and substrates.
- A 3D printable model is provided for device replication.
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