Correct Answer - Option 2 :
1, 3 and 4 only
Concept:
Nano-composites based on Carbon - nanotubes have been used to enhance a wide range of properties, giving rise to functional materials.
They have enhanced die-electric properties, thermal resistance, stiffness, strength and wear resistance.
Nano composites are used at high temperature where thermal stability is required.
It is used with matrix of butyl rubber within which embedded thin platelets of veumiculite is used.
Nano composites materials size is of nano range which is comparable to gas molecules sizes. So, gas permeability is less.
Nano composites are resistant to solvent so, that they cannot dissolve in it.
They do not have residual stress as these materials give excellent mechanical strength, toughness etc.
