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Development of Multi-physics Design System based on Phase Field Model for Nano/Microstructures

초록/요약

In a nano/microsystem, a computational approach-based design technique for a nano/microstructure indispensably requires a consideration of their inherent features, such as the complex multiple mechanisms which coupled with external fields and the surface/interface driven processes in order to exact design. Also, it demands a competence for the flexible representation of dynamic morphological evolutions including the complex and abrupt motions of nano/microstructures. Phase field model can be one of the most effective approach for the modeling of nano/micro scale structures, since it is beneficial to incorporate multiple mechanisms which are related with external driving forces and the inherent interface effects. Furthermore, phase field model can describe the complex morphological evolutions by its temporal and spatial continuum functions based on a diffuse-interface description. This thesis proposes a multi-physics design system based on phase field approach for the nano/microstructure with the various external field, such as elastic, thermal, chemical, electric, gravitational field, and diffusion. The developed design system is employed to the practical applications, for example, the material design with respect to a microscopic phase transformation and the micro- and nanofabrication based on a self-assembly. The design system provides an efficiency and exact methodology to design the material including material properties, such as Young’s modulus. Also, the formation mechanisms for the self-assembled structures in the nano/micro-system are investigated according to the competitions between the interface energies of each components and the inherent potentials. Furthermore, we provide the guidelines to design the nano/micro-systems. The proposed multi-physics design system based on phase field approach which can express those requirements of design for the nano/microscopic system introduce a novel and the highly reliable ways to design the nano/microstructure-based system.

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