ABSTRACT
The mechanical properties of single-walled carbon nanotube (SWCNT) are even more difficult to measure than those of MWCNTs, partly because as-produced SWCNTs are held together in bundles by van der Waals forces and to separate them into individual SWCNTs is simple. The optical properties of SWCNTs are linearly polarized along the tube axis permitting the determination of their orientation without the aid of electron microscope. The use of organic solvent alongside twist only shrinks the porous structure of the yarn and improves their mechanical and electrical properties, the densification reduces the sticking problem discussed as well. The isostrain or Voigt model is used to obtain the mechanical properties in the piezoresistive layer and considers the fact that the carbon nanotube (CNT) yarns form a continuous phase. The production methods of CNTs have improved over the years for optimal properties or requirements such as high yield of specified length, diameter, number of walls, and chirality.
