Direct-Write Assembly of Three-Dimensional Polyelectrolyte Scaffolds, Inorganic Hybrids, and Photonic Crystals
Xu, Mingjie
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https://hdl.handle.net/2142/82401
Description
Title
Direct-Write Assembly of Three-Dimensional Polyelectrolyte Scaffolds, Inorganic Hybrids, and Photonic Crystals
Author(s)
Xu, Mingjie
Issue Date
2007
Doctoral Committee Chair(s)
Lewis, Jennifer A.
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Biomedical
Language
eng
Abstract
Photonic crystals composed of a germanium hollow-woodpile architecture are created by replicating 3D microperiodic polymer scaffolds assembled by direct ink writing. First, polymer woodpiles with a face-centered tetragonal geometry are fabricated by direct ink writing. Chemical vapor depositions of silica and germanium are then performed under controlled conditions to produce optimal layer structures that maximize the photonic midgap/gap ratio. Next, the oxide and polymeric phases are removed to complete the fabrication of 3D hollow woodpile photonic crystals. The optical properties of the micro-periodic structures are measured after each processing step and correlated with changes in their geometry and composition. Together, the direct writing and replication schemes outlined above may offer a facile route for producing complex 3D structures, which may find potential application in composite, photonic, tissue engineering, and micro-fluidic devices.
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