Author/Authors :
Shin، نويسنده , , S.J. and Tran، نويسنده , , I.C. and Willey، نويسنده , , T.M. and van Buuren، نويسنده , , T. and Ilavsky، نويسنده , , J. and Biener، نويسنده , , M.M. and Worsley، نويسنده , , M.A. and Hamza، نويسنده , , A.V. and Kucheyev، نويسنده , , S.O.، نويسنده ,
Abstract :
Synthesis of nanoporous alumina monoliths with controlled morphology and density is a challenge. Here, we demonstrate mechanically robust alumina monoliths synthesized by conformal overcoating of graphitic nanoligaments of low-density carbon-nanotube-based aerogels (CNT-CAs) by using atomic layer deposition. Young’s modulus of resultant monoliths increases superlinearly with the monolith density with an exponent of ∼2.4, defined by the morphology and connectivity of the CNT-CA scaffold. As a result, for a given monolith density, alumina-carbon composites have moduli comparable to those of CNT-CAs and significantly superior to those of pure alumina aerogels reported previously.
