A bisphenol A diglycidylether based epoxy resin (D.E.R.™ 332, epoxy equivalent weight 176) and an amine hardener Triethylenetetramine (TETA) were used in this study. Xylenes (ACS Reagent, 98.5%) and 1-butanol (anhydrous, 99.8%) were used as solvents. All the materials and DNDs were purchased from Sigma Aldrich Inc., Saint Louis, MO. The raw multiwalled carbon nanotubes (MWCNTs) were purchased from Cheap Tubes Inc., Brattleboro, VT. For this study, both the CNTs and DNDs were purified by washing with dilute nitric acid. The average diameters of the CNTs were ∼30 nm and a length of up to 15 μm. The average particle size of DNDs was less than 10 nm.