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December 8, 2017

ALN nanopowder for heat conductive

AlN is an atomic crystal, diamond-like nitride, stable up to 2200 ℃. High intention at room temperature, and the intensity decreases slowly with increasing temperature. Good thermal conductivity, thermal expansion coefficient is small, or electrical insulator, dielectric properties, good mechanical properties. It is widely for High temperature structural parts, thermal conductive materials and crucibles and casting mold materials.

High thermal conductivity (about 270W / m · K
Thermal expansion coefficient (4.5 × 10-6 ℃)

ALN nanopowder For thermal conductive use:

1, thermal silica and thermal conductivity of epoxy resin
Ultra-high thermal conductivity of nano AlN composite silicone has good thermal conductivity, good electrical insulation, a wide range of electrical insulation temperature (operating temperature -60 ℃ – 200 ℃), lower consistency and good construction performance. Products have reached or exceeded the imported products, because it can replace similar imported products and are widely used in electronic devices heat transfer medium, improve work efficiency. Such as CPU and radiator gap, high-power transistors, SCR components, diodes, and the substrate contact with the slit at the heat transfer medium. Nano thermal paste is filled IC or transistor and the gap between the heat sink, increasing the contact area between them, to achieve better heat dissipation.

2, the application of thermal plastic: Nano aluminum nitride powder can greatly improve the thermal conductivity of plastics. By adding 5-10% of the experimental product into the plastic, the thermal conductivity of the plastic can be increased from 0.3 to 5. Thermal conductivity increased more than 16 times. Compared to the current market thermal filler (alumina or oh magnesium oxide, etc.) with a low amount of added, the mechanical properties of products have improved the role of thermal conductivity to improve more obvious characteristics. At present, relevant application manufacturers have already purchased Nano AlN powder on a large scale.

Apart from Aluminum Nitride nanopowder, also BN, SiC, alpha Al2O3 ZnO nanopowder, etc are also applied for thermal conductive. In theory BN nanopowder and ALN nanopowder have higher thermal conductivity. We believe there are increasing market for thermal conductive nanopowder materials, and for the Aluminum Nitride nano powder for thermal conductive use.

December 4, 2017

Properties and Applications of Boron Nitride Materials

h- BN powder is a hexagonal crystal, which is a kind of white flake-like fine material similar to graphite, commonly known as white graphite, and excellent in lubrication. BN powder is with lubricity, thermal conductivity and good high temperature performance.

Hexagonal boron nitride is called “white graphite” because it has a layered crystal structure similar to graphite and has similar physicochemical properties to graphite, such as good lubricity and thermal conductivity. h-BN is often used as a sintered ceramic material. Because of its high thermal conductivity, good electrical insulation, low thermal expansion coefficient and non-wettability with most metals, h-BN ceramic has been widely used in high temperature insulation parts, atomic energy, metallurgy, aviation and other fields.
As an advanced ceramic material, boron nitride has many excellent properties such as high temperature resistance, high thermal conductivity, high insulation, machinability, lubrication, non-toxicity and the like, and has strong neutron absorption capacity. Therefore, this new type of inorganic materials will have broad application prospects in the military engineering such as metallurgy, chemical engineering, machinery, electronics, aerospace and so on, and industrial production.
The use of boron nitride high temperature, electrical insulation, h-BN products can be used to make high-temperature plasma welding tools, insulation components, a variety of heater bushings, spacecraft thermal shielding materials. Coupled with the high thermal conductivity, which can be made of coal mine explosion-proof motor insulation heat sink, high temperature thermocouple protection sleeve. The use of h-BN glass, metal melt non-wettability and corrosion resistance, can be used for special smelting smelting a variety of non-ferrous metals, precious metals and rare metals containers, crucibles, pumps and other components.

In addition to the above properties, boron nitride does not soften and deform at high temperatures and can be used as high-temperature furnaces, mandarins and boats, particularly magnetoelectric power generators and plasma jet furnaces, requiring materials with a great heat resistance Impact and electrical insulation, BN is an excellent material in this regard. Boron nitride thermal conductivity is also very good, can be used as high-frequency electrical insulation materials, integrated circuits with heat sink and ion rocket nozzle accessories. The shape of these objects is complex, high precision machining requirements, excellent processing performance of the BN can fully meet the requirements. Boron nitride high pressure point, high resistance and good dielectric properties, can be used to make EHV insulation wire.

November 28, 2017

Germanium nanopowder

In recent years, lithium-ion batteries as its main energy storage system has been widespread concern, the development of high energy density, high power density and long life capacity of high-performance lithium-ion battery research has gradually become a hot research.

Recently, alloy lithium-containing negative electrode materials (including silicon, germanium, tin-based anode materials) with higher lithium capacity have become the most promising alternative materials for future graphite-based negative electrode materials. The structural design of these materials at the nanometer scale can effectively improve the electrochemical cycle and magnification performance of these materials, and fully demonstrate its promising application prospect in the next generation high performance lithium ion battery.

Germanium has a higher electrical conductivity and lithium ion diffusion than silicon, so germanium is a powerful candidate for high-power lithium-ion battery anode materials. At present, the researchers try to prepare a variety of germanium nano structured materials to improve their electrode performance. Korean scholar Park and so on to obtain zero-dimensional hollow germanium nanoparticles and three-dimensional porous germanium nanoparticles, showing better cycle performance.

Also, researchers at the University of Munich, Germany (TUM) and the University of Munich (LMU) have discovered a new method of making thin, solid, and porous semiconductor layers using nano structured germanium materials that are expected to be used to develop portable solar cells and batteries electrode.

This material is very suitable for small, lightweight and soft solar cells, or to improve the performance of rechargeable batteries electrode. Scientists by integrating the amount of organic polymers in the pores of germanium materials can be tailored to create the electrical properties of the symbiotic mixture. This design not only saves space, but also create a large interface surface, enhance the overall performance. In the porous porous germanium nanometer film filled with the right amount of organic polymer, making it a hybrid solar cell。

Manufacturers around the world are looking for light weight, sturdy materials, and portable solar cells. So far they are mainly used for organic compounds, which are sensitive and have a relatively short life span. Heat and light decomposition of the polymer and result in reduced performance. The thin but strong germanium mix provides a real choice.

November 23, 2017

What will replace ITO？ Metal mesh? Or silver nanowires?

What is ITO?

Indium Tim Oxide(ITO), is a thin-film material, usually used in LCD,PDP,EL/OLED, Touch Panel, Solar Cells and transparency electrode of other electronic instruments.

ITO is now widely used in electronic products, but the future of electronics, such as mobile terminals, wearable devices, smart appliances, etc. Touch panel is hoped to become the large-size, cost-reduction and flexible. This is bound to promote the new materials to replace traditional ITO.

Traditional ITO thin film can’t used in flexible application, and its inherent problems—-conductivity and light transmittance are difficult to overcome. Thus, numerous manufacturers begin to find the substitutes for ITO, such as silver nanowires, metal mesh, carbon nanotubes(CNTs) and graphene.

From technology and marketization level, metal mesh and silver nanowires will be the two major roles in new-developing touch technology.

ITO alternatives – silver nanowires

What is the silver nanowires?

Silver nanowires (Ag NWs) technology, the silver nanowires ink material is applied on plastic or glass substrate, and then using the laser lithography technology to portray into a transparent conductive film with nanoscale silver line conductive network pattern.

The Advantages and Disadvantages of Silver Nanowires

Advantages:

the production process is simple and good rate.
since the line width is small, the conductive thin film made of silver nanowires technique can achieve higher light transmittance than the one made of a metal grid technology.
compared to the metal mesh film, silver nanowires films own a smaller radius of curvature and the resistance change rate is small while bending, the application on devices with surface display, such as smart watches, bracelets, etc, has more advantages.
besides excellent electrical conductivity than silver, because of the nanoscale size effect, silver nanowires also have excellent transparency and resistance to flex.
large aspect ratio of silver nanowires effect makes its applications in conductive plastic, thermal plastic and other fields also have outstanding advantages.
Disadvantages:

With the severe diffuse reflection light irradiation in outdoor scenes, the screen reflective strongly, you can not see the screen clearly.
Silver nanowires Status

1. although silver nanowires has slightly high raw material costs, its preparation is simple, thus the overall cost is not high. And diffuse phenomenon can use some techniques to reduce:
2. the silver nanowires coated with a high refractive index material film;
3. blackening silver nanowires surface;
4. Reduce the reflective intensity;
5. roughened silver nanowires.

HWNANO supply kinds of siver nanowirs with various specification(ultrafine diameter to <30nm, length to >20um). As for confecting dispersion liquid, different medium,concentration can be customized.

November 17, 2017November 28, 2017

Heat dissipation application of graphite powder in LED lamps

The features of graphite powder are soft, dark gray; oily feel that can contaminate the paper. In the isolated oxygen conditions, the melting point above 3000 ℃, is one of the most resistant minerals. At room temperature, the chemical properties of graphite powder are relatively stable, insoluble in water, dilute acid, dilute alkali and organic solvents; different high temperature reaction with oxygen to produce carbon dioxide or carbon monoxide. It only oxidizes with fluorine and simple carbon in the halogen. Graphite powder is easier to acid oxidation. Besides, it can also react with many metals to form metal carbide, which can be smelted at high temperature.
Graphite powder is the necessary raw materials for industrial production and application. The application of graphite powder has begun to move to the more high-end, which has launched a variety of applications, such as in electronics, new energy, high-end manufacturing, medical and other fields. LED lamps is the environmental protection and energy saving lamps recent years that LED lights cooling is the need to solve the problem of graphite powder.
LED lamps and lanterns of the poor heat can lead to damage to power, light failure accelerated, shortened life and other issues, LED lighting system performance is always the top priority, metal materials in the application of LED cooling difficult to process, energy consumption, density is too large, conductive, easy to deformation and difficult to recover waste and many other issues, and graphite powder material will not be such a problem, graphite powder plasticity is good, easy processing, and has excellent high temperature, thermal conductivity and other properties. Graphite powder can be processed into the graphite heat sink, the heat emitted by the lamp will be absorbed through the graphite heat sink, and even to the surrounding heat, graphite powder and plastic can also be made into a heat sink, cooling the cooling cup and cooling shell and so on.
There are many cooling performance in the application of LED lights, including LED chip packaging components, LED optical lens, light scattering components, efficient cooling components, light reflection and light diffusion board. Graphite powder of high-end products plays an important role in the solar transparent electrode, thermal materials and touch screen and other fields.

September 22, 2017

Magical nano silver powder — seven antibacterial characteristics

The nanometer (nm) is the smallest unit of measure after the micron, and the nanometer is one millionth of one millimeter, that is to say, nanometer is one billionth of a meter. Nano silver powder is made through cutting-edge nano-technology. The emergence of silver powder in the nanometer state, promotes a qualitative leap of bactericidal ability, very few nano-silver can produce a strong bactericidal effect. It can kill more than 650 kinds of bacteria in a few minutes, with broad-spectrum sterilization and no resistance, whihc can promote wound healing, cell growth and repair damaged cells, without any toxic reactions, find no any stimulus response to the skin. All this opens up a broad prospect application of antimicrobial of nano silver powders,and become the latest generation of natural antibacterial agents. Nano silver sterilization has the following characteristics:

1. Broad spectrum antimicrobial

Nano-silver particles directly into the cell, work with oxygen metabolism enzyme (-SH), make the bacteria asphyxia and death of the unique mechanism of action, which can kill contact with most of the bacteria, fungi, mold, spores and other microorganisms. It has found that it has comprehensive antibacterial activity against drug resistant pathogens such as Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Streptococcus pyogenes, Enterococcus, and anaerobic bacteria. Fungi such as Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Candida albicans and other G +, G-pathogens have bactericidal effects on Chlamydia trachomatis, causing sexually transmitted diseases. Neisseria gonorrhoeae also has a strong bactericidal effect.
An antibiotic can kill about 6 pathogens, while nanoscale silver can kill hundreds of pathogenic microorganisms. Strong effect to kill bacteria, fungi, trichomoniasis, chlamydia / chlamydia, Neisseria gonorrhoeae, bactericidal, the same effect for antibiotic resistance!

2. Potent sterilization

According to the study, it’s found that Ag can kill more than 650 kinds of bacteria in a few minutes. Nano-silver particles and pathogens after the cell wall / membrane binding, can directly into the cell, quickly with the oxygen metabolism of the enzyme thiol (-SH) binding, the enzyme inactivation, blocking the respiratory metabolism to suffocate. Unique bactericidal mechanism, so that nano-silver particles in the low concentration can quickly kill pathogens.

3. Permeability is strong

Nano-silver particles with superior permeability, can quickly penetrate the skin 2mm sterilization, have a good bactericidal effect on the common bacteria, stubborn bacteria, drug-resistant bacteria and fungi caused by deep tissue infection.

4. Repair regeneration

Nano silver can promote wound healing, promote the repair and regeneration of damaged cells, to rot myogenic, anti-bacterial anti-inflammatory to improve the microcirculation around the wound tissue, effectively activate and promote tissue cell growth, accelerate wound healing, reduce scar generation.

5. Antibacterial lasting

Nano-silver particles using patented technology, a layer of protective film, in the human body can be gradually released, so antibacterial effect

6. Safe and non-toxic

As early as the “Compendium of Materia Medica” records: raw silver, non-toxic; US Public Health Bureau in 1990, “on the toxicity of silver investigation report” that: silver on the human body no obvious side effects; nano silver is topical, Is the safest way to use it. According to the experimental study found that mice in the oral maximum tolerance of 925mg / kg, which is equivalent to the clinical use of 4625 times the dose, without any toxic reactions in the rabbit skin irritation experiments, did not find any stimulus response.

7. No drug resistance

Nano-silver is non-antibiotic fungicide: nano-silver can kill a variety of pathogenic microorganisms, stronger than antibiotics, 10nm size of nano-silver particles unique antibacterial mechanism can quickly kill bacteria directly to the loss of reproductive capacity, therefore, can not produce Drug resistance of the next generation, can effectively avoid the resistance caused by recurrent long-term treatment.

Hongwu Nano, an expert in manufacturering in nanopowders since 2002, especialy nano Silver powders with the best antibacterial property.
High purity,99.99%, good shape,spherical, uniform particle size, easy to disperse nano silver powders are supplied.
Generally speaking, the smaller particle size of Ag nanoparticles, the better bactericidal effect.
Silver nanopowders can not only be available for powders state, but also nano silver antibacterial solution, which is ready to be used, is available.
The concentration of nano silver antibacterial solution is 1000PPM commonly. Other concentration of the solution can be customized.

August 31, 2017August 31, 2017

Nanomaterials closely related to life

Nanotechnology has become a trend, has a great help in our basic necessities of life including Buildings, clothing, food, transportation, medical care, etc. Nanomaterials with dimensions below around 100 nm exhibit unique physical and chemical properties drastically different from their bulk counterparts. The intricate relationship between nanostructure and functionality has opened up a whole new area of research where scientists world-wide aim at exploring, understanding and exploiting the potential of nanomaterials.

1. Sterile tableware and aseptic packaging with nanometer materials makes food more security.

nanomaterial representative: silver nanoparticle, silver nanowire, tio2 nano, etc.

2. That some nanopowders have strong adsorption ability, can make the waste water thoroughly become clear water and reach drinking standard.

nanomaterial representative: Iron nanoparticles, fe3o4 nano, Tio2 nano,etc.

3. Adding nanoparticles to the ceramic can make the material strength and toughness be greatly increased, which is expected to become the ideal material of cars, ships and other engine parts.

nanomaterial representative: silicon carbide nanoparticle, TIC nanoparticles, zro2 nano

4. the micro drug delivery device with nanotechnology can carry a certain dose of the drug in the body, can take the initiative to search for attacking cancer cells or repair damaged tissue.

nanomaterial representative: diamond nanoparticles,iron nanoparticles

5. Adding a small amount of nanoparticles can eliminate electrostatic phenomena of chemical fabric.

nanomaterial representative: ATO nano, TiO2 nano, ZnO nano, carbon nanotube, and metal nanoparticles,etc.

6. Building materials containing nanoparticles and solar thermal reflective material can absorb ultraviolet ray.

nanomaterial representative:TiO2 nano, ZnO nano, WO3 nano, carbon nanotube, etc.

7. Most of us once broke mobile phone or tablet screen.This is a very troublesome thing, we also need to find a place to repair, and pay big money to replace a new screen. Scientists have researched a material that is made of silver nanowires and graphene, which make touch screen be non-friable and flexible, what’s more, it is cheaper.

8. Cosmetics use. platinum nanoparticles, gold nanoparticles, tio2 nano, Zno nano, sio2 nano,etc.

9. More application.

nanoparticles manufacturer

Hongwu International Group Ltd is a Nanotechnology Company manufacturing nanoparticles and nanopowders, developing new nanomaterial based applications for the industry and supplying almost all kinds of nano-micro sized powders and more from worldwide-known companies. Our company provides our customers:

Carbon Nanotubes and Graphene Nanomaterials (almost all kinds are available)

High Quality Nanoparticles and Nanopowders (Elements, Alloys, Metal and Non-Metal Oxides, Compounds)

High Quality Microparticles and Micron Sized Powders (Elements, Alloys, Metal and Non-Metal Oxides, Compounds)

Nanowires

Nanoparticle Dispersions

If you are looking for related products that are not in our product list yet, our experienced and dedicated team is ready for help. Do not hesitate to contact us at hwnano@xuzhounano.com. thank you.

June 30, 2017

Silver nano powder market is expect a fast growth

Nowadays natural resources are far not enough to meet applications need, especially when it comes to high-tech and high-end products and rise new market needs.
Today we’ll discuss the market growth of a high-tech raw material silver nano powder.

1.Silver nano powder is widely used in the electronic industry: High-end silver paste (glue) chip components for external electrode pulp; thick film integrated circuit pulp; solar cell electrode paste, LED chip package with conductive silver plastic; used in printed electronic devices such as conductive ink, etc. The growth of electronic industry will help the growth of silver nano powder.

2.Silver nano powder is widely used for antibacterial. Since silver nano powder’s lasting and special antibacterial function, it is applied to produce antibacterial products: antibacterial Medicine and medical equipment; antibacterial plastic, rubber products, textiles and clothing footwear; antibacterial coatings, ceramics and glass; green antibacterial coatings green home appliances and furniture products etc. More and more manufacturers use silver nano powder to meet market antibacterial need and trend, also take it as a selling point, which customers will buy.

3.Silver nano powder as catalytic, materials Ethylene oxidation reaction catalyst, fuel cell with a supported silver catalyst New energy heat exchange material, etc. Since the small size and high specific surface area, silver nano powder is widely used as catalyst.

In the past years, many researchers are made to explore and testing special applications of silver nano powders in different areas. And now many of them has proved to work good and detailed application technology has get matured. Together with the industries it applied for grows fast. To conclude, silver nano powder are expected a fast growth.

June 23, 2017

Ultrafine Silver Powder Used for Conductive Silver Pastes

Ultrafine Silver Powder Used for Conductive Silver Pastes

Advantages: flexibility, conductivity, good printability, different rheological performance
The composition of the Silver conductive slurry requires different types of silver powders (such as the commonly used silver powders, of which particle size between 0.1 microns and 10 microns) or combined as conductive filler, and even different formulations in each category require different silver powders as conductive function materials.
Object: To achieve maximum utilization of silver conductivity and thermal conductivity with the least amount of silver powders in the established formulation or film forming process, to optimize the performance and cost of film properties.

General classification of Ultrafine Silver Powders in Electronic industry:

1. High – temperature sintered silver conductive paste with high sintering active silver powders
2. High – temperature sintered silver conductive paste with high dispersion silver powders
3. High conductivity reduction silver powders
4. Bright silver powders
5. Flake silver powders
6. Coarse silver powders

Application of Conductive Silver Pastes

1.The application in the electronics industry

For a variety of touch screen, film shape, electronic toys, computer keyboard, remote control and other electronic products, to play a part in conductive, thermal, shielding and so on.

2.Application in Solar Energy Industry

Solar conductive paste is one of the most important materials of solar energy, solar cells in addition to the most important material other than silicon, and solar energy conversion efficiency is closely related. (The solar cell back electrode and the front electrode are used silver paste)

Solar cell requirements for the slurry:
Forming a good ohmic contact, low contact resistance
Good wire conductivity
Strong adhesion strength
High aspect ratio
Wide sintering process window
Good chemical stability
There are suitable for large-scale production process
Low price
Solderability, solderability

Because of good performance of ultrafine silver powders used in conductive silver pastes, it’s a good choice in solar energy conductive pastes.

June 9, 2017

Silver nanopowder for antibacterial

Antibacterial mechanism of nano silver powder

Nano-silver particles can enter inside the micro-organisms, interrupt RNA replication to stop it’s reproduction , meanwhile it attached to the microbial cell wall, the impact of microbial organisms transmission finally cause the cell’s rupture and death.

Advantage of nano silver powder in antibacterial application

1) Disinfection and sterilization effect is good, lasting and have no drug resistance problem.

2) small amount at ppm level nano-silver antimicrobial products means lower cost.

3) without shortcoming of allergies and excessive deposition as traditional silver salt antibacterial agent do.

4) non-toxic to human safety, environmentally friendly.

Speak of nano silver powder, it’s like a far away high-technology topic, but speaking of specific, detailed antibacterial applications, we know nano silver particle can be part of our daily life.

Food

No doubt people consume food every day, and silver nano particle could take pat in our daily life in the way of antibacterial food container. Since nano silver have an inhibitory effect on the common food contamination bacteria (Gram-positive bacteria, Gram-negative bacteria, yeast, mold, etc.), it is applied to produce antibacterial food containers: nano silver food crisper, nano silver plastic wrap, antibacterial ceramic tableware, antibacterial refrigerator

Clothing

Nano silver’s antibacterial works as well as on fabrics, try search nano silver antibacterial socks on your online purchasing platforms, there surly comes out lot of results. In fact, some researchers does experiments and proves that nano silver particle function more than merely antibacterial part, also fabrics’’ anti-static and far infrared performance is also improved by nano silver finishing.

Living

Nano silver is also widely used in building materials: Nano silver antibacterial coatings, nano-silver antibacterial paint, etc., they are coated on the surface of the plate can kill the surface attached bacteria, and the antibacterial effect is lasting.

Medicine

No doubt that antibacterial work is more critical when it comes to the matter of health. And yes nowadays nano silver particle is maturely applied into medicines. For example: nano silver antibacterial dressings, nano silver antibacterial gel, nano silver antibacterial catheter, nano silver antibacterial equipment, nano silver bone cement, etc. I cannot list them all.