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Carbon nanotubes used in polymer composites

Because carbon nanotubes have a similar structure to polymer materials (epoxy resin, polystyrene, polymethyl methacrylate, polyacetylene, nylon and polyurethane, etc.), it is easy to form an ideal interfacial bonding force when mixed, resulting in improved performance. The composite material exhibits excellent strength, wear resistance, electrical conductivity, antistatic properties and other properties that the polymer itself does not have.

1. The acidified carbon nanotubes were compounded with high-density polyethylene (HDPE), and the oriented carbon nanotubes/HDPE composites were prepared by mechanical blending method, which improved the yield strength and tensile strength of the composites. modulus.

2. The carbon nanotube/polytetrafluoroethylene composite material prepared by the customer has a reduced coefficient of friction and improved wear resistance.

3. A company uses carbon nanotubes to reinforced polyurethane composite materials, with a strength/weight ratio of more than 50%, to manufacture larger, stronger and lighter wind turbine blades, so that the power generation of wind turbines can reach more than 1.5MW.

4. Poly(3-octylthiophene)/carbon nanotube composites, the electrical conductivity is improved by 5 orders of magnitude.

5. Adding 8.5wt% single-walled carbon nanotubes to polystyrene-isoprene reduces the resistivity by 10 orders of magnitude.

6. Adding 2-3% of multi-walled carbon nanotubes to the plastic can greatly improve the electrical conductivity; dispersing carbon nanotubes in an epoxy resin, a small amount of addition can produce higher electrical conductivity. Adding 10% carbon nanotubes to engineering plastics such as polycarbonate and polyamide, the conductivity is much higher than other conductive fillers of the same kind. Based on this, the demand for carbon nanotubes in the plastics industry is increasing day by day. china professional carbon nanotube supplier –www.hwnanomaterial.com.

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Application of nano materials in the coating field

The nano raw materials used in the coating field are mainly divided into the following categories according to their functions: Photocatalytic nano-coatings, weather-resistant nano-coatings, high-mechanical properties nano-coatings, transparent heat-insulating nano-coatings, and conductive nano-coatings.

1.Photocatalytic Nanocoatings
Using the photocatalytic properties of Titanium dioxide nanoparticles, scientists have already carried out the protection of historical building relics. The researchers took advantage of the wide catalytic properties of nano-TIO2 that most of the Ca(OH)2 in the layer reacted with SO2 oxidized by OH to form CaSO4, which prevented the further erosion of buildings by SO2 and CO2 in the air, and effectively protected historical buildings. remains. In the application of photocatalytic decontamination and sterilization, CUxO/TIO2 nanocomposite products that can absorb visible light have been applied indoors.

2. Weather resistant nano coating
The high-energy damage of ultraviolet rays is the main culprit for the degradation and aging of organic matter in coatings. The small size effect of nano materials makes it have a strong absorption effect on ultraviolet rays, and the particle size of nanoparticles is much smaller than the wavelength of visible light, which ensures that the layer has good transparency. At present, the most widely used weather-resistant nano materials are nano-TIO2, ZNO, SIO2. Among them, TIO2 has excellent functions of absorbing, reflecting and scattering ultraviolet rays, so it is an ideal UV protectant. ZNO has good absorption and scattering effect on long-wave ultraviolet. SIO2 has extremely strong reflectivity to medium-wave and long-wave ultraviolet rays, and it can play a better shielding effect when added to coatings. Weather-resistant nano-coatings are widely used in building materials, cosmetics and art protection.

3. Nano coating with high mechanical properties
The characteristics of the filler directly determine the function and performance of the coating. The contact area between the nanoparticles and the organic matter in the coating is huge, and the bonding force is strong, which increases the mechanical properties of the organic layer, such as the hardness, impact resistance and wear resistance of the coating.
Research indicates that addition of nano-AL2O3, TIO2, SIO2, ZNO and other particles into coatings can significantly enhance the anti-scratch and wear-resistant properties of the coatings. This is widely used in automotive topcoats, furniture paints, lens complaints and other fields.

4. Transparent heat-insulating nano-coating
Nano metal oxide particles are selective to the solar spectrum and are ideal filler particles for nano coatings. Nano ATO tin antimony oxide, nano ITO indium tin oxide and nano zinc aluminum oxide have good barrier properties for near infrared. Nano TIO2, ZNO, FE2O3, etc. have a good barrier to ultraviolet rays. Evenly dispersing such nano-oxide particles into an organic solution can prepare nano-composite transparent thermal insulation coatings, which has a huge promotion effect on building energy conservation, emission reduction and environmental protection advocated by the state.

5. Conductive Nanocoatings
At present, nanoparticles such as nano-ATO, SNO2, TIO2, ZNO, FE2O3 have been used in electrostatic shielding nanocomposite coatings. The fillers are in contact with each other to form a conductive network, and the carriers move freely in the conductive network.
Another popular conductive material in the market is nano AZO, which is doped with Al2O3 in ZnO, has high temperature resistance, good electrical conductivity, strong high temperature stability and good radiation resistance. The product is a relatively cheap, cost-effective and environmentally friendly.

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Summary of the various applications of nano graphene on mobile phones

Graphene is a two-dimensional material. Carbon atoms are arranged in a hexagonal shape and are connected to each other to form a carbon molecule. Its structure is very stable. As the number of connected carbon atoms increases, the two-dimensional carbon molecule plane keeps expanding, and so does the molecule. A single layer of graphene is only one carbon atom thick, that is, 0.335nm, which is equivalent to 1/200,000 of the thickness of a hair. There will be nearly 1.5 million layers of graphene in 1 mm thick graphite. Graphene is the thinnest known material and has the advantages of extremely high specific surface area, superior electrical conductivity and strength. The existence of the above advantages is that it has a good market prospect. Various applications of graphene oxide powder on mobile phones are as follows:

Screen

Graphene screens can use force sensors, bringing a new dimension to touchscreen technology. Furthermore, thanks to graphene’s high toughness, these new properties can be integrated into flexible screens, which are useful for wearable technology.

Phone case

Graphene is a high-strength material. Mixed with resins and plastics, or even just as a coating, graphene could be used to make safer helmets, stronger aircraft parts and more durable building materials. Combining graphene with a phone’s case could make it even stronger, and we might never have to worry about it falling off again!

Antennas and Communications

Graphene could boost optical data communications to unprecedented rates while reducing energy consumption and transmission errors. By 2020, the graphene flagship aims to link more than 400 gigabits of data per second. Graphene can also serve as the basis for flexible near-field communication (NFC) antennas, enabling new technologies such as electronic banknotes or smart wallets.

Sensors

Graphene sensors have many applications: linking to health sensors throughout our bodies, monitoring high-risk infections, oxygen and sugar levels, correcting our posture, and even helping us track neurological pathologies. Sensors can also detect and analyze our environment.

Processors and Electronics

Graphene’s electronic properties allow us to make faster and more reliable phone accessories. Graphene has high strength, conductivity, yet thin — just one atom thick, enabling thinner and faster microprocessors for smart products and the Internet of Things. Graphene and related materials are so flexible that devices can be integrated into textiles or even ‘stickers’ directly on the skin.

Battery

Graphene can be used to improve the capacity, efficiency and stability of batteries. Graphene batteries can have higher energy storage and better performance in terms of service life and charging time. Graphene and related materials can also be used to improve the performance of other energy storage solutions, such as supercapacitors. Another role of graphene in graphene-based lithium-ion batteries is to improve heat dissipation.

Headphones/Speakers

Graphene nanopowder could make headphones and speakers more energy-efficient and lighter, while producing better sound. As membranes become lighter, they are often too FL releasable and generate unnecessary vibration and noise. Graphene is flexible and strong, so distortion is reduced and people can enjoy their favorite music sources with unprecedented clarity!