High-quality high-purity multi-walled carbon nanotubes >99% conductive and thermally conductive conductive paste multi-walled carbon nanotube powder

Product Details

Main structural parameters and detection indicators

Carbon tube diameter: 30-60nm
Carbon tube length: 5-15um
Bulk density: 0.080-0.100g/cm³
Multi-walled carbon nanotubes, prepared by modified catalytic chemical vapor deposition (CCVD), feature high conductivity, high specific surface area, high carbon phase purity, narrow outer diameter distribution, ultra-high length-diameter ratio, etc., with stable product quality.

Multi-walled carbon nanotubes are mainly used in related industries such as rubber, plastics, lithium batteries and coatings. In terms of rubber, they are mainly applied to rubber products like tires and sealing rings, with advantages of high conductivity, high thermal conductivity, high wear resistance, high tear resistance, etc. In terms of plastics, adding a small amount can greatly improve conductivity, thermal conductivity and mechanical properties, and they are mainly used in plastic products such as PP, PA, PC, PE, PS, ABS, unsaturated resins and epoxy resins.

Multi-walled carbon nanotubes

Carbon nanotubes are another allotrope of carbon discovered after C60. Their radial size is small; the outer diameter of the tube is generally a few nanometers to tens of nanometers, and the inner diameter of the tube is even smaller, with some being only about 1nm. Their length is generally on the micrometer scale, and the ratio of length to diameter is very large, reaching 10³ to 10⁶. Therefore, carbon nanotubes are considered a typical one-dimensional nanomaterial. Since their discovery by humans, carbon nanotubes have been hailed as the material of the future and are one of the frontier fields of international science in recent years. Professor Alex Zettl from the University of California, Berkeley, believes that when comprehensively comparing C60 and carbon nanotubes in terms of application prospects, C60 can be summarized in one page.

Introduction

In 1985, Professor Kroto, a spectroscopist from the University of Sussex in the UK, and Professors Smalley and Curl from Rice University in the US, during their collaborative research, discovered that carbon can form highly symmetric cage-structured molecules C60 and C70, composed of 60 or 70 carbon atoms, which are called Buckyballs. In 1991, scientist Iijima from NEC in Japan first used a high-resolution tunneling electron microscope to discover a carbon nanotube with an outer diameter of 515nm and an inner diameter of 213nm in the cathode scar formed during the preparation of C60. This carbon nanotube is composed of only two layers of coaxial graphite-like cylindrical surfaces stacked together. Subsequently, in 1993, the research groups of Iijima and Bethune simultaneously reported the synthesis of single-walled carbon nanotubes with a very simple structure. This provided experimental possibilities for the theoretical prediction of the properties of carbon nanotubes, further expanded the range of carbon cluster materials, and greatly promoted theoretical and experimental research on carbon nanotubes, making this field a global research hotspot today [1].

In 1985, Professor Kroto, a spectroscopist from the University of Sussex in the UK, and Professors Smalley and Curl from Rice University in the US, during their collaborative research, discovered that carbon can form highly symmetric cage-structured molecules C60 and C70, composed of 60 or 70 carbon atoms, which are called Buckyballs. In 1991, scientist Iijima from NEC in Japan first used a high-resolution tunneling electron microscope to discover a carbon nanotube with an outer diameter of 515nm and an inner diameter of 213nm in the cathode scar formed during the preparation of C60. This carbon nanotube is composed of only two layers of coaxial graphite-like cylindrical surfaces stacked together. Subsequently, in 1993, the research groups of Iijima and Bethune simultaneously reported the synthesis of single-walled carbon nanotubes with a very simple structure. This provided experimental possibilities for the theoretical prediction of the properties of carbon nanotubes, further expanded the range of carbon cluster materials, and greatly promoted theoretical and experimental research on carbon nanotubes, making this field a global research hotspot today [1].

Feature

The unique structure of carbon nanotubes determines that they possess many special physical and chemical properties. The C=C covalent bonds that constitute carbon nanotubes are the most stable chemical bonds in nature, thus endowing carbon nanotubes with extremely excellent mechanical properties. Theoretical calculations indicate that carbon nanotubes have extremely high strength and great toughness. Their theoretical values are estimated to have a Young's modulus of up to 5 TPa, a strength approximately 100 times that of steel, while their weight density is only 1/6 that of steel. Treacy et al. were the first to use TEM to measure the mean square amplitude of multi-walled carbon nanotubes over a temperature range from room temperature to 800 degrees, thereby deducing that the average Young's modulus of multi-walled carbon nanotubes is approximately 1.8 TPa. Salvetat et al. measured the Young's modulus of small-diameter single-walled carbon nanotubes and derived their shear modulus to be 1 TPa. Wong et al. used an atomic force microscope to measure the average bending strength of multi-walled carbon nanotubes as 14.2 ± 10.8 GPa, while the bending strength of carbon fibers is only 1 GPa. In terms of both strength and toughness, carbon nanotubes are far superior to any other fibers and are regarded as the "super fibers" of the future.

Development prospects

It is predicted that carbon nanotubes may become a new type of high-strength carbon fiber material, which not only possesses the inherent properties of carbon materials, but also has the electrical and thermal conductivity of metal materials, the heat resistance and corrosion resistance of ceramic materials, the编织性 of textile fibers, and the light weight and easy processability of polymer materials. Using carbon nanotubes as a composite material reinforcement is expected to exhibit good strength, elasticity, fatigue resistance, and isotropy, and it is anticipated that carbon nanotube-reinforced composites may bring about a leap in the performance of composite materials. Research on making composites with nanotubes first began on metal matrices, such as Fe/carbon nanotubes, Al/carbon nanotubes, Ni/carbon nanotubes, Cu/carbon nanotubes, etc. The focus of research on carbon nanotube composites has shifted to polymer/carbon nanotube composites. For example, in lightweight and high-strength materials, where carbon fibers are used as reinforcing materials, the mechanical properties of carbon nanotubes, along with their small diameter and large aspect ratio, will bring better reinforcing effects.

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