Conductive fillers (carbon nanotubes, silver powder, copper powder) and conductive inks

Conductive ink is a special conductive coating that has been developed rapidly with the emergence of modern printed electronic technology. Compared with electronic products manufactured by traditional conductive coatings, printed electronic products based on conductive inks are flexible, large-area, lot sizing, lightweight, low cost, and environmentally friendly, and the market prospects are broad. Carbon nanotubes have high conductivity and large aspect ratio. As a conductive filler, it is very easy to build a conductive path and an ideal conductive ink filler.

Conductive ink is a composite material composed of conductive fillers, resin binders, solvents, dispersion stabilizers and additives. Among them, conductive fillers are the key functional phase. According to the properties of conductive fillers, it can be divided into three categories: silver, copper, and carbon (carbon nanotubes, graphene).

The latest application of nano conductive ink:

1.Flexible transparent conductive film

Using nano silver conductive ink as the conductive raw material, latest manufacturing technology-nano imprinting technology to produce the flexible transparent conductive film to replace the traditional conductive film. The flexible transparent conductive film produced by this process has the following characteristics: the surface resistance and light transmittance of the film are adjustable, which is better than the ITO transparent conductive film; the patterned electrode can be realized at one time, the flexible substrate is used, and the roll-to-roll large area and batch can be realized. It can be manufactured at a low cost and achieve extremely high surface conductivity.

2.RFID antennas

As early as many years ago, some people began to study using nano conductive ink to print RFID antennas. Its biggest advantages are simple process, environmental protection, and low drying temperature (applicable to a variety of substrates). Commonly used RFID antennas are divided into high frequency and ultra high frequency. The high frequency antenna manufacturing process is relatively cumbersome, and the circuit needs to be bridged between the front and back; the UHF antenna only needs to be printed on the substrate once, and the chip can be obtained after drying, RFID tags. Therefore, the nano conductive ink printing UHF RFID antenna has more efficiency advantages.

3.Transistors

The benchmark for measuring the chip manufacturing process is the width of the connecting wires of the transistors in the chip, that is, the line width. The line width of a semiconductor chip is limited by the atomic size and has its physical limit. The chip volume cannot be infinitely small, and the frequency of power-on and power-off cannot be increased any more. Breaking through this bottleneck requires a thorough innovation in materials and technology. CNTs transistors can be used to replace silicon transistors. The performance of transistors made of CNTs is 3 to 5 times higher than that of traditional silicon transistors, and the production cost is low.

At present, some R&D institutions have begun to use carbon nanotubes conductive ink to print transistors. Use printing technology to make CNTs transistors on flexible substrates reach a practical level, and are used for RFID tags.

4.Paper battery

Paper batteries refer to ultra-thin batteries printed with conductive inks (mainly as electrodes) using paper or film substrates as carriers. The terminal products of paper batteries include active or semi-active RFID tags, tag sensors, smart cards, smart packaging, medical electronic drug stickers, etc..

Nano silver(Ag) conductive ink can also be applied to paper battery electrodes. Domestic manufacturers have also done this test, using nano silver conductive ink through inkjet printing to obtain electrodes on the PET film. After charging and discharging tests, it is found that it has better battery capacity and stable performance.

 

Conductive ink is an indispensable material for printed electronic devices, and is the key and core technology in the upstream of the printed electronics industry chain. It is believed that in the near future, large-scale flexible displays, environmentally friendly ultra-thin batteries, RFID tags, etc. will bring great convenience to people’s lives.

 

Hwnanomaterial is supplying conductive fillers for conductive inks in bulk, including silver, copper, silver-coated copper powder, carbon nanotubes, graphene, and so on. Welcome to contact us if you have any requirements!

Nanomaterials for textiles

With the development of science and technology and the improvement of human living standards, people have imcreasing requirements on comfortable and novel health care for clothing. Now people apply nano materials to textiles, and various functional textiles have emerged. Here are a few nano materials for textiles.

1.Nano zinc oxide

The photocatalytic antibacterial mechanism of Zinc Oxide Nanopowder and the antibacterial mechanism of metal ion dissolution have an antibacterial and deodorizing function; the nano zinc oxide has a strong absorption effect on ultraviolet rays in the range of 200-400 nm, and can be used as an ultraviolet shielding agent.

Nano zinc oxide itself is non-toxic and environmentally friendly; compared with antibacterial nano silver, the price is much lower.

Because of these functions and advantages, nano zinc oxide can be used to make functional textiles with antibacterial deodorizing function and UV protection.

2.Nano titanium oxide

Nano TiO2 has the basic properties of nano functional materials, and is used in textiles to have functions such as UV resistance, self-cleaning, air purification, anti-static, anti-infrared, anti-aging, etc.

Nano titanium dioxide is used in the textile slurry. Through the perfect combination with starch, the comprehensive weaving performance of the yarn is improved, the amount of PVA is reduced, the cooking time is short, the slurry cost is reduced, the sizing efficiency is improved, and the PVA pulp is also solved. It is not easy to desizing, environmental pollution and many other problems. Nano-titanium dioxide nano-titanium dioxide is mainly used to replace PVA in the yarn, which acts as a smooth hair, fills the gap and lubricates.

3.Nano silica

Nano-silica powder used in textiles can enhance the adhesion of the slurry to the fiber. The active hydroxyl groups on the surface and the hydrogen bonds on the starch and the hydroxyl groups on the cotton fibers have strong or weak hydrogen bonding, which can effectively improve the pure cotton and polyester. The sizing performance of cotton yarn; nano-silica is more beneficial to the sizing of cellulose fibers; it has the effect of enhancing and grinding and reducing hairiness.

Hydrophobic nano silica can be used to make hydrophobic textiles.

 

4.Nano antimony trioxide

Nano Antimony trioxide is a commonly used inorganic flame retardant and does not have good flame retardancy. However, when it is used together with a halogen flame retardant, it will have a great synergistic effect. Commonly used cerium oxides are antimony trioxide and antimony pentoxide, mainly antimony trioxide, and its flame retardant performance is 3-5 times that of antimony pentoxide. Therefore, it is generally believed that the flame retardant of antimony is antimony trioxide, which can be used for preparing flame retardant textile coatings, non-woven coating coating flame retardant, carpet flame retardant and other fireproof coatings, fire retardant coating flame retardant and the like.

In practical applications, it is often the case that several nano materials are mixed with other auxiliaries in textiles for new and functional textiles.

Nano-textiles are favored by researchers and companies for their superior performance, and the variety is growing. It is believed that these nano materials market for textiles will be increasing. https://www.hwnanomaterial.com/

The Application Of Nano Silver Antibacterial In Clinical Treatment

Nano silver powder is a new type of antibacterial product developed based on nanotechnology. Due to the quantum effect, small size effect and large specific surface area, it has an antibacterial effect that traditional inorganic antibacterial agents can’t match. It has high safety and long-lasting effectiveness. , Is an antibacterial agent with long-lasting and weather resistance.

Regarding the principle of the bactericidal effect of nano-silver, most scholars believe that the specific surface area of ultra-fine silver is very large and presents AG+ in water. Therefore, the bactericidal effect of nano-silver is mainly related to silver ions, which can be related to the -SH in the enzyme protein in the bacteria. It binds quickly to inactivate key metabolic enzymes, making pathogenic bacteria unable to metabolize and die; secondly, nano-silver can bind to DNA bases of pathogenic bacteria and form cross-links to replace hydrogen bonds between adjacent nitrogens in purines and pyrimidines. Which denatures DNA without being able to replicate, leading to inactivation of pathogenic bacteria. The atomic arrangement of nano-silver shows that it is a “medium state” between solid and molecule. This extremely active nano-silver particle has super antibacterial ability and can kill bacteria, fungi, mycoplasma, chlamydia and other pathogenic microorganisms. In addition, nano-silver is a non-antibiotic bactericide, and no bacteria are resistant to nano-silver.

1. Application in burns, scalds, burn skin grafts
The results of skin grafting for dozens of burn patients showed that nano-silver increased the epithelialization rate of reticuloepithelial grafts by 40%, and had a better effect on promoting repair of residual burn wounds. The healing time of the experimental group was significantly shorter than that of the control group. Researchers believe through clinical observations and animal experiments that nano-silver antibacterial medical dressings are a kind of clinical external medicine for burns with strong anti-infective effect, low absorption, small toxic and side effects, and convenient use.

2. Application in dermatology
Nano silver is effective in treating acne vulgaris. The nano-ulcer patch is used to treat I-II bedsores. In comparison with the control, it is found that the active ingredient of the nano-ulcer patch is nano-silver particles, which has super permeability, produces a biothermal effect, improves the microcirculation of the damaged tissue, and eliminates the local area. Edema is conducive to tissue regeneration and wound healing.

3. Application in dentistry
Nano silver antibacterial agent can be used to prevent oral caries and mucosal diseases, and can also solve the problem of easy pollution during the production and use of dental materials.

In summary, due to its quantum effect, small size effect and large specific surface area, nano-silver materials are easily in close contact with pathogenic microorganisms, thereby exerting greater biological effects, so they have high safety, wide antibacterial range, and continuous Advantages such as long sterilization time. However, nano-silver materials are prone to particle aggregation and lose their nano-characteristics under conventional conditions without protective agents, which will affect the antibacterial effect of nano-materials. Therefore, the packaging and storage of nano-silver are also extremely important. For details, please consult Hongwu Nano staff online our website:https://www.hwnanomaterial.com/.

Thermal Conductive Filler Alumina Powder

Commonly used thermal conductive materials are:  auminum oxide nanopowder, zinc oxide nanopowder, magnesium oxide nanopowder, aluminum nitride, boron nitride, silicon carbide and so on.

Alumina Al2O3 has the advantages of thermal conductivity and insulation, and can be used as a thermally conductive filler to prepare thermally conductive insulating glue, potting glue and other polymer materials. Compared with other fillers, although the thermal conductivity of alumina is not the best, it can basically meet the basic thermal conductivity requirements. In addition, the price of alumina is relatively low, and the source is relatively wide. It is an economical and suitable filler for high thermal conductivity insulating polymers.

Hongwu Nano can produce white alumina micron powder in batches, with narrow particle size distribution, stable process and high thermal conductivity. According to customer feedback, the thermal conductivity can reach between 3-10W/(m*K) according to different filling amounts.

The particle size of alumina powder used for thermally conductive fillers is 1um, 500nm, 300nm, 200nm. The bulk price is more cost-effective.

Thermally conductive alumina can be widely used in different materials such as silica gel, potting glue, epoxy resin, plastic, rubber thermal conductivity, thermal conductive plastic, silicone grease, heat dissipation ceramics, etc. In practical applications, Al2O3 powder filler can be used alone or mixed with other fillers such as AIN and BN.

In order to improve the dispersibility of the alumina powder, the surface of the alumina can be modified with a silane coupling agent or hexadecyltrimethoxysilane.

If you want to know more about the thermal conductivity of alumina, please feel free to consult online at any time!