The methods of high-resolution field ion microscopy with sample cooling to liquid helium temperature are used in a study of the products of gas-phase catalytic pyrolysis of hydrocarbons in the form of graphitized fibers containing carbon nanotubes. Full atomic resolution of the end cap of closed carbon nanotubes is achieved for the first time. It is found that the atomic structure of the tops of the caps of subnanometer carbon tubes consists predominantly of hexagonal rings. A possible reason for the improvement of the resolution of field ion images of nanotubes upon deep cooling is discussed.
We studied the possibility of using 3D structures based on carbon catalytic deposits as carriers for human bone marrow stromal cells. It was found that carbon catalytic deposits obtained by gas deposition method using FeCl(3) × 6H(2)O as the catalyst are a biocompatible material for human bone marrow stromal cells promoting adhesion, proliferation, and distribution of cells within the 3D carrier, and therefore can be used for tissue engineering.
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