Thesis
Modeling and fabrication of micro and nanoscale 3-D networks by additive printing
Washington State University
Master of Science (MS), Washington State University
2017
Handle:
https://hdl.handle.net/2376/103054
Abstract
Three dimensional (3-D) hierarchical materials are important to a wide range of emerging technological applications. We report a method to synthesize complex 3-D micro-engineered materials such as micro-lattices with nearly fully dense truss element with minimum diameter of approximately twenty micrometers and having high aspect ratios (up to 20:1) without using any templating or supporting materials. The method uses direct printing of nanoparticle dispersions using aerosol jet technology in three dimensional space without templating or supporting materials followed by binder removal and sintering. In addition to 3-D micro-lattices, we have also demonstrated directly printed stretchable interconnects, spirals and pillars. This assembly method could be implemented by a variety of micro droplet generation methods for fast and large scale fabrication of the hierarchical materials for applications in tissue engineering, ultralight/multifunctional materials, microfluidics, and micro-optoelectronics. Compressive properties of printed 3-D materials are investigated by experiments and numerical study. Simulations are conducted using full-scale finite element (FE) models developed based on the geometry of actual cells of printed structures in order to reproduce and capture the material behavior during compression. It is demonstrated that by incorporating the key parameters such as geometric characteristics, material properties, and processing parameters with our designed FE models, the simulations capture several results from experiments, both qualitatively and quantitatively. By comparing two sets of results in simulation with experimental results, we also demonstrate that fullness fraction of scaffold is a key parameter in determining the strength.
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Details
- Title
- Modeling and fabrication of micro and nanoscale 3-D networks by additive printing
- Creators
- Chunshan Hu
- Contributors
- Rahul Panat (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525054901842
- Language
- English
- Resource Type
- Thesis