Construction and control of 3D porous structure based on vapor deposition on sublimation solids
Journal
Applied Materials Today
Journal Volume
7
Pages
77-81
Date Issued
2017
Author(s)
Abstract
Three-dimensional porous structures are constructed via vapor deposition onto a sublimating solid template. Construction upon deposition of vapor-phase material occurs at a dynamic vapor¡Vsolid interface and is directed by the solid surface vanishing by sublimation. A proof-of-concept demonstration showed vapor depositions of poly-para-xylylenes (PPXs) on sublimating templates, including ice and mixtures with ethanol and hexane. The material construction macroscopically produces a replica architecture of the parent template. Characteristics of the pore structures are formed during the construction process as a result of the gas vapor and the space that is vacated by sublimation, thus enabling control of the porosity through regulation of the sublimation speed and/or the thermodynamic properties of the templates. The technology introduced herein provides a novel approach for 3D porous material manufacturing and overturns the notion that vapor deposition necessarily forms dense thin films on substrates. ? 2017 Elsevier Ltd
Subjects
3D
Material fabrication
Porous structure
Sublimation
Vapor deposition
Type
journal article