Schematic comparison of a macro composite containing Hmx25 um x L) fibers in an amorphous matrix to that of a nano-composite at the same volume fraction of filler, but containing 1 nm x 25 nm fibers. Constituents in any composite the matrix (white), the reinforcement (fiber, red), and the so-called interfacial region (green). Scanning electron micrograph shows E-glass reinforced polyolefin (5 um fiber) and transmission electron micrograph shows montmorillonite-epoxy nanocomposite nm thick layers)