Ultralight Metallic Microlattices

作者：Schaedler T A^*; Jacobsen A J; Torrents A; Sorensen A E; Lian J; Greer J R; Valdevit L; Carter W B

来源：Science, 2011, 334(6058): 962-965.

DOI：10.1126/science.1211649

Ultralight (<10 milligrams per cubic centimeter) cellular materials are desirable for thermal insulation; battery electrodes; catalyst supports; and acoustic, vibration, or shock energy damping. We present ultralight materials based on periodic hollow-tube microlattices. These materials are fabricated by starting with a template formed by self-propagating photopolymer waveguide prototyping, coating the template by electroless nickel plating, and subsequently etching away the template. The resulting metallic microlattices exhibit densities rho >= 0.9 milligram per cubic centimeter, complete recovery after compression exceeding 50% strain, and energy absorption similar to elastomers. Young's modulus E scales with density as E similar to rho(2), in contrast to the E similar to rho(3) scaling observed for ultralight aerogels and carbon nanotube foams with stochastic architecture. We attribute these properties to structural hierarchy at the nanometer, micrometer, and millimeter scales.

• 出版日期2011-11-18