Abstract: A substance-encapsulating carbon nanohorn aggregate which has improved chemical stability by isolating the encapsulated substance from outside and which is useful as a targeting material which can be led from the outside of the body or as a contrast medium by holding the encapsulated substance in an aggregated form, and a process for producing the same are provided. The substance-encapsulating carbon nanohorn aggregate is characterized in that the encapsulated substance is aggregated in a central part of the carbon nanohorn aggregate or a neighborhood thereof with being isolated from outside. The process includes aggregating a substance to be encapsulated in a central part or a neighborhood thereof by a heat treatment.

Abstract: An object is to provide means, which is capable of performing quality management with sufficient precision even in a case where the thickness of an amorphous carbon layer is small, as quality management means for a negative electrode active material of a lithium-ion secondary battery including an amorphous carbon layer on a surface. Provided is a quality management method for a negative electrode active material of a lithium-ion secondary battery which includes an amorphous carbon layer on a surface. In the quality management method, an aspect of a change in a plurality of D/G ratios, which are obtained by performing a first process of heating an inspection object at a predetermined heating temperature, and of measuring each of the D/G ratios through Raman scattering spectroscopy measurement a predetermined number of times while changing the heating temperature, is set as an index of the quality management.

Abstract: A substance-encapsulating carbon nanohorn aggregate which has improved chemical stability by isolating the encapsulated substance from outside and which is useful as a targeting material which can be led from the outside of the body or as a contrast medium by holding the encapsulated substance in an aggregated form, and a process for producing the same are provided. The substance-encapsulating carbon nanohorn aggregate is characterized in that the encapsulated substance is aggregated in a central part of the carbon nanohorn aggregate or a neighborhood thereof with being isolated from outside. The process includes aggregating a substance to be encapsulated in a central part or a neighborhood thereof by a heat treatment.

Abstract: An amorphous carbon rod (13) is formed in contact with a catalyst fine particle (11). The fine particle (11) is liquefied by heat treatment, and moved along the amorphous carbon rod (13). The trail of the movement is converted to a carbon nanotube.

Abstract: An amorphous carbon rod (13) is formed in contact with a catalyst fine particle (11). The fine particle (11) is liquefied by heat treatment, and moved along the amorphous carbon rod (13). The trail of the movement is converted to a carbon nanotube.