Provided is a carbon nanotube aggregate excellent in gripping force. The carbon nanotube aggregate of the present invention is a carbon nanotube aggregate of a sheet shape, including a plurality of carbon nanotubes, wherein the carbon nanotube aggregate has a cohesive strength N of 3 nJ or more on a front surface and/or a back surface thereof, which is measured by a nanoindentation method with an indentation load of 500 N.

A method of making a stretchable film structure is provided. An elastic substrate is pre-stretched in a first direction and a second direction to obtain a pre-stretched elastic substrate. A carbon nanotube film structure is laid on a surface of the pre-stretched elastic substrate. The carbon nanotube film structure comprises a plurality of super-aligned carbon nanotube films stacked with each other. The pre-stretching the elastic substrate is removed and a plurality of wrinkles is formed on a surface of the carbon nanotube film structure to form the stretchable film structure. The present disclosure also relates to the stretchable film structure obtained by the above method.

Carbon nanotube foams are provided which comprise tubes substantially aligned longitudinally in a first direction, wherein: each tube defines an outer wall and an inner wall, and each tube comprises an entangled bundle of carbon nanotubes substantially aligned longitudinally in the first direction; and tubes in at least a subset of the tubes are positioned with respect to each other to form one or more first hexagonal units, wherein each first hexagonal unit comprises first-hexagonal-unit tubes, wherein the first-hexagonal-unit tubes comprise six peripheral first-hexagonal-unit tubes and a central first-hexagonal-unit tube, wherein the six peripheral first-hexagonal-unit tubes surround the central first-hexagonal-unit tube in a juxtaposed, hexagonal configuration. Articles of manufacture, e.g., helmets, comprising the foams are also provided which are configured to cover at least a portion of an object, e.g., a human head, and to attenuate an external force acting on the object, including external forces originating from oblique impacts.

The present disclosure provides systems and methods for producing a volume of substantially all armchair nanotubes of a preselected chirality for fabricating yarn consisting of substantially all metallic conducting armchair tubes. The systems and methods can be used for the synthesis of (10,10), (11,11), and (12,12) metallic armchair carbon nanotubes and potentially other chiralities. The elements of the present disclosure include: (i) a carbon source that provides substantial numbers of ethylene and acetylene radicals in combination with a high population of ethylene groups and a small amount of methane, (ii) a hydrogen to carbon ratio sufficient to passivate all other chiral growth sites to a higher degree than armchair growth sites, and (iii) a CVD process that can be tuned to create a well-controlled population of catalyst with tight diameter distribution with sparse modal distribution that falls within a range of the desired single wall diameters.

The present invention relates to a carbon nanotube fiber and methods for preparing the same. In one embodiment, a method for preparing a carbon nanotube fiber comprises reacting a carbon source in the presence of a catalyst and a catalytic activator to form carbon nanotube aggregates, contacting the carbon nanotube aggregates with graphene oxide, and forming the carbon nanotube aggregates in contact with the graphene oxide into a carbon nanotube fiber.

In the present invention, only low-growth carbon nanotubes are selectively separated among solid particles discharged during a reaction and then re-input to a reactor, so that it is possible to improve the quality of a carbon nanotube product to be produced and the productivity of a carbon nanotube production process.

The carbon nanotube structure in which a plurality of carbon nanotubes are assembled includes a joining portion of end portions of carbon nanotubes and a joining portion of an end portion and a side wall portion of the carbon nanotubes.

Provided is a carbon nanotube aggregate that can maintain a sheet shape. The carbon nanotube aggregate of the present invention includes a plurality of carbon nanotubes, the carbon nanotube aggregate being formed into a sheet shape, wherein the carbon nanotube aggregate includes a non-aligned portion of the carbon nanotubes. In one embodiment, the carbon nanotube aggregate further includes an aligned portion of the carbon nanotubes. In one embodiment, the non-aligned portion is present at an end portion in a lengthwise direction of the carbon nanotube aggregate.

The invention discloses the application of carbon nanotube assemblies to the preparation of a nanocarbon impact-resistant material. The carbon nanotube assembly is a macrostructure provided with at least one continuous surface, a plurality of carbon nanotubes are densely distributed in the continuous surface, and at least partial segments of at least part of the multiple carbon nanotubes continuously extend in the continuous surface. The invention further discloses a preparation method of the nanocarbon impact-resistant material. The nanocarbon impact-resistant material has an excellent protection effect, has the advantages of being light, good in flexibility, wide in tolerable temperature range, capable of being bent freely, good in fitness, breathable, adaptable to heat-moisture balance of human bodies, good in wearing comfort and the like, and can be widely applied to bullet-proof materials, stab-proof materials and explosion-proof materials.

An adduct consists of derivatives of serinol pyrrole and of carbon allotropes in which the carbon is sp.sup.2 hybridized, such as carbon nanotubes, graphene or nano-graphites or carbon black, in order to improve the chemical-physical properties of the allotropes increasing above all their dispersibility and stability in liquid media and in polymer matrices, and a process for preparation of the adduct.