Carbon nanotubes (CNT) have generated a lot of research activities due to their outstanding properties. Production methods generally induce different kinds of pollution or entangled nanotubes; so they can not be used directly. . So various treatments have been developed such as adding dispersing polymers or surfactants and/ or ultra sound exposition or functionalization. Solutions of nanotubes interest industrials who want to integrate them in high added value products such as composites, films or aerogels