NOVELTY - The system comprises a housing (52) having an inlet (53) for engaging an independent synthesis chamber (51) within which nanotubes are produced, a spindle having an intake end and an opposing outlet end, and a body portion positioned at the intake end of the spindle. The spindle extends from within the housing across the inlet and into the chamber for collecting the nanotubes through the intake end and for twisting the nanotubes into a nanofibrous yarn. The body portion includes a pathway to impart an initial twisting force onto the flow of nanotubes through the pathway.    USE - The system is useful for forming a nanofibrous yarn and non-woven sheets from carbon nanotubes, nano wires or other filamentous structures, where the non-woven sheet is useful: in composite structures for end use applications such as sporting goods products and helmets and in electrical applications as conducting materials or as electrodes of a capacitor, battery or fuel cell; in anisotropic composites and thermal conductors; and gratings, filters, and shields of electromagnetic radiation or other waves such as electrons or neutrons.    ADVANTAGE - The system is capable of easily forming the yarn and non-woven sheets with excellent tensile strength, high tensile modulus and thickness, enhanced stiffness, good fatigue resistance and mechanical property, improved thermal and radiation resistances, enhanced electrical and thermal conductivity and high integrity and without failure.    DETAILED DESCRIPTION - The system comprises a housing (52) having an inlet (53) for engaging an independent synthesis chamber (51) within which nanotubes are produced, a spindle having an intake end and an opposing outlet end, and a body portion positioned at the intake end of the spindle. The spindle extends from within the housing across the inlet and into the chamber for collecting the nanotubes through the intake end and for twisting the nanotubes into a nanofibrous yarn. The body portion includes a pathway to impart an initial twisting force onto the flow of nanotubes through the pathway and to guide them into the spindle for collection and twisting into the nanofibrous yarn. The housing is airtight to minimize the airborne release of nanotubes and related particulates generated from within the chamber. The initial twisting force is transverse to the pathway to create a vortex flow upon the flow of nanotubes through the pathway. INDEPENDENT CLAIMS are included for:    (1) a method for forming a nanofibrous yarn; and    (2) an apparatus for presenting synthesized nanotubes in a twisting manner for subsequent formation of nanofibrous materials.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a system for forming nanofibrous materials.    Synthesis chamber (51)    Housing (52)    Inlet (53)    Belt (54)    Roller. (55)