Title:
Materials “Alchemy”: Chemical Transformation of 3-D Macro-to-Microscale Structures into Replicas Tailored for Catalytic, Optical, Energy, and Aerospace Applications
Materials “Alchemy”: Chemical Transformation of 3-D Macro-to-Microscale Structures into Replicas Tailored for Catalytic, Optical, Energy, and Aerospace Applications
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Author(s)
Sandhage, Kenneth H.
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Abstract
Nature provides remarkable examples of microscale structures with complex
three-dimensional (3-D) morphologies and finely-patterned features formed by
living organisms. For example, intricate 3-D microscale silica or chitinous
structures with organized nanoscale features are formed by diatoms (single
celled algae) or Morpho butterflies, respectively. Synthetic
rapid-prototyping or self-assembly approaches have also yielded 3-D
structures with microscale and/or nanoscale particles/pores in certain
desired arrangements. While such 3-D patterned structures can be attractive
for particular applications, the materials readily formed by these processes may not possess preferred chemistries for a broader range of uses. The scalable fabrication of structures with complex 3-D morphologies and
with a range of tailorable chemistries may be accomplished by separating the
processes for structure formation and for chemical tailoring; that is,
structures with a desired 3-D morphology may first be assembled in a readily-formed chemistry and then converted into a new functional chemistry
via a morphology-preserving transformation process. In this presentation,
several shape-preserving chemical conversion (conformal coating-based and
fluid/solid reaction-based) approaches will be discussed for generating 3-D
replicas of biogenic and synthetic structures comprised of ceramic, metal, or
composite materials for catalytic, optical, energy harvesting/storage, and
aerospace applications.
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Date Issued
2013-02-26
Extent
47:18 minutes
Resource Type
Moving Image
Resource Subtype
Lecture