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Carbon nanotube assembly and viscoelastic body using same

A technology of carbon nanotubes and aggregates, applied in the direction of carbon nanotubes, oriented carbon nanotubes, nanocarbons, etc., can solve problems such as difficult operation and particle collection, and achieve excellent operability and low viscosity

Active Publication Date: 2014-08-06
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in existing viscoelastic materials, it is difficult to selectively collect particles of a specific particle size from a particle population with a wide particle size distribution
In addition, due to the strong viscosity of existing viscoelastic materials, it is easy to adhere to smooth surfaces and difficult to handle

Method used

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  • Carbon nanotube assembly and viscoelastic body using same
  • Carbon nanotube assembly and viscoelastic body using same
  • Carbon nanotube assembly and viscoelastic body using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] On a silicon wafer (manufactured by Silicon Technology) as a substrate, an Al thin film (thickness 10 nm) was formed using a sputtering apparatus (manufactured by ULVAC, RFS-200). On this Al thin film, an Fe thin film (thickness: 0.35 nm) was vapor-deposited using a sputtering apparatus (manufactured by ULVAC, RFS-200).

[0116] Thereafter, the substrate was placed in a 30 mmΦ quartz tube, and a mixed gas of helium / hydrogen (90 / 50 sccm) with a water content of 600 ppm was flowed in the quartz tube for 30 minutes to replace the inside of the tube. Thereafter, the temperature inside the tube was raised to 765°C using a tubular electric furnace and stabilized at 765°C. Keep the temperature at 765°C, fill the tube with helium / hydrogen / ethylene (85 / 50 / 5sccm, moisture content 600ppm) mixed gas, and let it stand for 1 minute to grow carbon nanotubes on the substrate to obtain carbon nanotubes oriented in the length direction. Carbon nanotube aggregates (1).

[0117] The leng...

Embodiment 2

[0121] A carbon nanotube aggregate (2) in which carbon nanotubes were oriented in the longitudinal direction was obtained in the same manner as in Example 1 except that the thickness of the Fe thin film was 1 nm.

[0122] The length of the carbon nanotubes included in the carbon nanotube aggregate (2) was 30 μm.

[0123] In the distribution of the number of layers of carbon nanotubes included in the carbon nanotube aggregate (2), the mode exists in two layers, and the relative frequency is 75%.

[0124] The obtained aggregate of carbon nanotubes (2) was used as the viscoelastic body (2), and various evaluations were performed, and the results are summarized in Table 1 and Table 2.

Embodiment 3

[0126] Except that the standing time after the helium / hydrogen / ethylene (85 / 50 / 5sccm, moisture content 600ppm) mixed gas is filled in the tube is 3 minutes, carry out in the same manner as in Example 2, and obtain carbon nanotubes in which the carbon nanotubes are oriented in the longitudinal direction. Aggregate (3).

[0127] The length of the carbon nanotubes included in the carbon nanotube aggregate (3) was 50 μm.

[0128] In the distribution of the number of layers of carbon nanotubes included in the carbon nanotube aggregate (3), the mode exists in two layers, and the relative frequency is 75%.

[0129] Various evaluations were performed using the obtained aggregate of carbon nanotubes (3) as the viscoelastic body (3), and the results are summarized in Table 1 and Table 2.

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Abstract

Provided is a material for a viscoelastic body having little tack and excellent handling, and which is capable of selectively picking particles having a specified particle diameter. Also provided is a viscoelastic body using this kind of material. This carbon nanotube assembly comprises a plurality of carbon nanotubes; the carbon nanotubes have a plurality of layers; the distribution width for the number-of-layers distribution for the carbon nanotubes is at least 10 layers; the relative frequency for the mode of the number-of-layers distribution is no more than 25%; and the length of the carbon nanotubes is greater than 10 [mu]m. In addition, this carbon nanotube assembly comprises a plurality of carbon nanotubes; the carbon nanotubes have a plurality of layers; the mode for the number-of-layers distribution for the carbon nanotubes is no more than 10 layers; the relative frequency for said mode is at least 30%; and the length of the carbon nanotubes is greater than 10 [mu]m.

Description

technical field [0001] The present invention relates to a carbon nanotube aggregate and a viscoelastic body using the carbon nanotube aggregate. Background technique [0002] Since a viscoelastic body has an excellent balance of elasticity and viscosity, it is useful as a material for an adhesive, and research and development are being actively carried out in various industrial fields (see Patent Document 1). Adhesives composed of viscoelastic materials have low modulus, so they wet and adhere to the adherend to express adhesive force. [0003] Conventionally, acrylic resins, rubber-based resins, silicone-based resins, and the like have generally been used as materials for adhesives. [0004] On the other hand, it is known that a columnar fibrous structure having a fine diameter exhibits adhesive properties. It is known that adhesive force is expressed by Van der Waals force following the irregularities on the surface of an adherend due to its micron-order or nano-order di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J23/745
CPCC01B31/0226C01B2202/34B07B13/04Y10S977/752B82Y40/00C01B2202/08Y10T428/2918B82Y30/00Y10T428/249924Y10S977/753Y10S977/962C01B32/16C01B32/158C01B2202/00C01B32/162
Inventor 前野洋平
Owner NITTO DENKO CORP
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