Simulating droplet dynamics during evaporation-driven self-assembly

John J. Dyreby; Kevin T. Turner; Gregory F. Nellis

doi:10.1117/12.720620

21 March 2007 Simulating droplet dynamics during evaporation-driven self-assembly

John J. Dyreby, Kevin T. Turner, Gregory F. Nellis

Proceedings Volume 6517, Emerging Lithographic Technologies XI; 651738 (2007) https://doi.org/10.1117/12.720620
Event: SPIE Advanced Lithography, 2007, San Jose, California, United States

Abstract

A modeling methodology based on the coupling of free surface energy minimization techniques and computational fluid dynamics (CFD) modeling has been developed for simulating the macro-regime of evaporation-driven self-assembly processes; specifically, those processes that use lithographically defined features to precisely direct the self-assembly of particles on a substrate. Because surface tension dominates the gravitational, inertial, and viscous forces acting on the droplet, the shape of the droplet is determined as a function of its volume and pinning geometry by minimizing its surface energy. The evolution of droplet shape during evaporation is used to define the deforming control volume, over which the governing partial differential equations for conservation of mass, momentum, and particle concentration are solved. By decoupling the free surface and the flow models, a diverse range of problems can be investigated. The macro-scale model is envisioned as one part of a hierarchical model that can be used to study the entire lithographically-directed, evaporation-driven self-assembly process.

Citation Download Citation

John J. Dyreby, Kevin T. Turner, and Gregory F. Nellis "Simulating droplet dynamics during evaporation-driven self-assembly", Proc. SPIE 6517, Emerging Lithographic Technologies XI, 651738 (21 March 2007); https://doi.org/10.1117/12.720620

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