Dynamic Behavior of Vertically Aligned Carbon Nanotube Foams With Patterned Microstructure
We present the design, fabrication, and dynamic characterization of micropatterned vertically aligned carbon nanotube (VACNT) foams. The foamsʼ synthesis combines photolithographic techniques with chemical vapor deposition to create materials with an effective density up to five times lower than that of bulk VACNT foams. The dynamic response of these lightweight materials is characterized by performing impact tests at different strain rates. Results show that the dynamic stress–strain behavior of the micropatterned foams is governed by the patternsʼ geometry and has negligible dependence on their bulk density. The energy absorption of the micropatterned foams is higher than most other energy absorbing materials, such as honeycombs, foams, and composites of comparable density. Highly organized CNT microstructures can be employed as lightweight material for protective applications.
© 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Article first published online: April 22, 2015; Manuscript Received: December 17, 2014; Manuscript Revised: February 24, 2015. The authors acknowledge the financial support from the Institute for Collaborative Biotechnologies (ICB) under the contract W911NF-09-D-0001 with the Army Research Office (ARO). L. Lattanzi and L. De Nardo acknowledge INSTM. The authors thank the Kavli Nanoscience Institute at Caltech for the use of nanofabrication facilities.