Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session G27: Flow Instability: Interfacial and Thin Film III
10:35 AM–12:45 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B315
Chair: Fredrik Lundell, KTH Royal Institute of Technology
Abstract ID: BAPS.2018.DFD.G27.3
Abstract: G27.00003 : Thermo-electrical reflowing of pre-patterned thin films*
11:01 AM–11:14 AM
Presenter:
Hadi Nazaripoor
(Department of Mechanical Engineering, University of Alberta)
Authors:
Hadi Nazaripoor
(Department of Mechanical Engineering, University of Alberta)
Mohtada Sadrzadeh
(Department of Mechanical Engineering, University of Alberta)
The electrohydrodynamic (EHD) instabilities are combined with thermocapillary (TC) instabilities to reflow the pre-patterned nanofilms aiming at creating high aspect ratio and well-ordered nanopillar arrays. Thin film (initial thickness of h0) is sandwiched between two electrodes and the electric field and the thermal gradient is applied in the transverse direction. Using the long-wave approximation simplified the governing equations and boundary conditions leading to thin film equation that describes the dynamics and spatiotemporal evolution of the interface. Increasing the height of the protrusions, ξ, leads to a single columnar structure forming (with lower aspect ratio) whereas for the smaller values hierarchical patterns are formed. To have equally-sized pillars and to avoid a multi-scale pattern formation, using ξ/h0≥2 is recommended. The effect of protrusions width is examined on the pattern fidelity and pillars’ aspect ratio.The optimum width ratio of w/ΛLS =0.4 is found as for protrusions with smaller size leads to larger sized pillars with lower aspect ratios. Term ΛLS is the characteristic wavelength for the growth of the instabilities found from linear stability analysis.
*Funding for this study was provided by NSERC.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G27.3
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