Fibrous columnar structure aggregate and pressure-sensitive adhesive member using the aggregate

A fibrous columnar structure aggregate comprising a plurality of fibrous columnar structures, wherein:

• the fibrous columnar structures comprise carbon nanotubes, and the carbon nanotubes comprise carbon nanotubes each having a plurality of walls;
• the carbon nanotubes each having a plurality of walls including carbon nanotubes each having a length of 500 μm or more;
• a mode of a wall number distribution of the carbon nanotubes each having a plurality of walls, wherein the number of walls is 10 or less, and the relative frequency of the mode is 30% or more;
• and
• the shear adhesive strength of the fibrous columnar structure to a glass surface at 250° C. is 0.8 to 1.2 times that of its shear adhesive strength to the same glass surface at room temperature.

A fibrous columnar structure aggregate comprising a plurality of fibrous columnar structures, wherein:

• the fibrous columnar structures comprise carbon nanotubes, and the carbon nanotubes comprise carbon nanotubes each having a plurality of walls;
• the carbon nanotubes each having a plurality of walls including carbon nanotubes each having a length of 500 μm or more;
• a mode of a wall number distribution of the carbon nanotubes each having a plurality of walls, wherein the number of walls is 10 or less, and the relative frequency of the mode is 30% or more;
• and
• wherein when the fibrous columnar structure has adhesive strengths of A and B when adhered to first and second surfaces, respectively;
• first and second surfaces possessing surface free energies represented by a and b, respectively;
• whereby a>b by 25 mJ/m2 or more, and B/A is equal to 0.8 to 1.2.