Architected cellular ceramics with tailored stiffness via direct foam writing

TitleArchitected cellular ceramics with tailored stiffness via direct foam writing
Publication TypeJournal Article
Year of Publication2017
AuthorsMuth, JT, Dixon, PG, Woish, L, Gibson, LJ, Lewis, JA
JournalProceedings of the National Academy of Sciences of the United States of America
Pagination1832 - 1837
Date Published2017/02/21/
ISBN Number0027-8424
Keywords3D printing, biological-materials, cellular architectures, ceramics, composites, cylindrical-shells, emulsions, foams, lightweight, mechanical-properties, metamaterials, particle-stabilized foams, porous, porous ceramics, ultralight

Hierarchical cellular structures are ubiquitous in nature because of their low-density, high-specific properties, and multifunctionality. Inspired by these systems, we created lightweight ceramic architectures composed of closed-cell porous struts patterned in the form of hexagonal and triangular honeycombs by direct foam writing. The foam ink contains bubbles stabilized by attractive colloidal particles suspended in an aqueous solution. The printed and sintered ceramic foam honeycombs possess low relative density (similar to 6%). By tailoring their microstructure and geometry, we created honeycombs with different modes of deformation, exceptional specific stiffness, and stiffness values that span over an order of magnitude. This capability represents an important step toward the scalable fabrication of hierarchical porous materials for applications, including lightweight structures, thermal insulation, tissue scaffolds, catalyst supports, and electrodes.

Short TitleProc. Natl. Acad. Sci. U. S. A.