Table 1. Some typical properties of the nanomaterials used in this study.

	MWNT	Nano-clay	Nano-alumina
Average diameter	10–20 nm	10–100 nm	10–30 nm
Purity	>90%	>90%	100%
Form	Powder	Powder	Powder
Average thickness	0.2–0.4nm	<2–6μm	20–50 nm
Total surface area	1200 m2/g	41.8039 m2/g	143.7037 m2/g
Density	50–400 kg/m3	28600 kg/ m3	3000 kg/ m3
Max.tensile strain	63GPa	4.656GPa
Colour	Black	Off White	Off White