Silver Nanopowder and Silver Nanowires Application Guide

Silver Nanoparticle application guide:
Common stirring to disperse the silver nanopowder is very difficult. At least more than 30 minutes with an ultrasonic disperse. Using pvp coated or a fatty acid coated is just in order to improve the dispensability of the silver powder. Generally based on customer requirements have been handled well in advance, and then customer can be used directly. Unmodified silver nanopowder’s dispersion, generally need to add some non-toxic surfactants, such as washing fruits and vegetables detergent. Before to disperse pvp-coated silver nanopowder, it is suggested to wetted with ethanol and then add water to stir, without affecting the customer process, add a few drops detergent mixing, the effect is also very good.

Silver Nanowires application guide:
Generally we maintain silver nanowires inventory in powder form. We could also maintain dispersed in ethanol or IPA. Just depends on the customer required. Shipments in solvents may require additional lead time. We can provide silver nanowires in different concentration according to customer request. The solvent include ethanol, isopropanol, diethylene glycol, water, terpineol and so on. And silver nanowires is very stable, not easy to be oxidized, could use it under the room temperature. But after open it, please sealed it up at soon as possible so that will not affect the powder quality when exposed to the air in long time.

Nano materials, nano iron, nano cobalt, nano aluminum,nano silver powder and other materials application

A nanometer is a unit of length, 1 nanometer is one hundred thousand of one meter, the equivalent of only 50 nanometers thousandth of a human hair. Scientific experiments confirmed that when the normal material is processed to the nanometer scale, there will be specific physical and chemical properties, its magnetic, optical, electrical, acoustic, thermal, mechanical and chemical characteristics will startling change. As originally conductive copper at a certain limit will not conductive nano; originally began conducting insulating nano silicon dioxide at a certain limit; all have become nano metal powder can absorb light of black powder. The emergence of nanomaterials greatly expand the scientific imagination, with the continuous development of science and technology, nanotechnology will enter the lives of ordinary people, penetrate into clothing, food, field shelter, and so on. Experts predict that nanotechnology, information technology and biotechnology will be the three pillars of social and economic development in the 21st century.

Impact on various fields since the nano-metal materials since its birth impressive, largely because they tend to “stunt”, with excellent performance, and performance when complexed with other materials out of the unique properties, which are widely used in metallurgy , machinery, chemicals, light industry, electronics, defense, nuclear technology, aerospace, etc., are briefly as follows:
1. catalyst material: conventional catalysts of iron, copper, nickel, palladium, platinum, etc. made of nanoparticles can greatly improve the catalytic effect. With metal nanoparticles carrying increasingly sophisticated technology and improve the stability of nano-powder metal catalyst industry will be one of the important applications of nano metal powder industry.

2. the electromagnetic functional materials: nano-iron, cobalt powder can be applied to enhance the power and improve the sound quality speaker appliances and other fields. Such as nano-iron can be used as permanent magnetic materials, can greatly improve the performance of tape and large-capacity hard and soft disk.

3. Stealth absorbing materials: nano-metal powder as absorbing materials, with bandwidth, good compatibility, low mass, thin and so on. It plays an important role in the infrared-rays detector, the infrared sensor, a millimeter wave invisible infrared invisible and visible light and so on.

4. the metal nano-lubricant additives: metal nano lubricant additives product has the following characteristics: (1) superior anti-wear performance, extend equipment life 2-3 times, saving lubricating oil with about 40 percent, greatly reducing equipment maintenance, parts the number of replacement; (2) energy efficiency significantly increase the fuel efficiency of 10 to 32%, increase engine power by 20%; (3) reducing the temperature of parts during operation, reduce mechanical noise, reduce vehicle exhaust and smoke pollution, effectively prevent the equipment, outdated or overloaded vehicles cause trembling, burning oil and other phenomena; (4) a very excellent thermal stability, both in the hot summer temperatures make the minimum required to maintain machinery and equipment and running smoothly, but also in the cold winter quickly start the engine, running easily; (5) has excellent oil solubility, increase the variety of performance lubricants, extending oil seals, rubber, plastic mats deformation, aging, embrittlement of time.

5. anti, sterilization materials: nano silver Escherichia coli, Staphylococcus aureus and other dozens of pathogenic micro-organisms have a strong inhibitory and killing effect. As a new anti-infective products, this nano-silver antimicrobial powder is different from all of the current anti-infective with broad-spectrum, a variety of performance without resistance, without pH impact. Nano nickel, silver fungus, anti-corrosion coatings can also be used in the protection of cultural relics.

6. efficient combustion: Adding nano-iron, nickel, aluminum powder to the solid fuel rocket propellant can greatly improve the combustion heat and combustion efficiency of the fuel and improve combustion stability. Studies have shown that the solid rocket fuel was added to the 0.5% nano-aluminum or nickel powder, can increase by 10% -25% combustion efficiency, combustion speed number of times.

7. electrostatic shielding materials: the addition of nano metal particles in chemical products can solve their static problems and improve safety. Join in plexiglass or other organic synthetic nano-metal powder materials, can achieve electrostatic shielding, may also improve light transmission. Nano is expected to have greater prospects for development of metal in household appliances, electronic shielding and other industries.

8, the medical material: from the current research point of view, medical imaging, drug delivery, cell staining, cell separation, disinfection and sterilization in the future have to use nano-metal.

Nano Silica Coating, Nano Titanium Dioxide Coating

Part of the bus use a transparent glass wall insulating glass coating, which is composed of nanoscale semiconductor material that allows interior cool. Such coatings and high-tech sound, that what constitutes nano-coating paint it? In general, the nano-coating must meet two conditions: First, the coating has at least one phase of the particle size range of 1-100 nanometers in diameter, and secondly, to make the presence of nano-coatings have significantly improved the performance or with new features.

Nano-silica coating: silica architectural coatings non-hierarchical, thixotropic, anti-sagging, good construction performance, and to a large extent improved the stain resistance, excellent self-cleaning properties and adhesion.Capable of forming a network structure of nano silica coating when dry, the coating can improve the degree of finish and aging vehicles, ships and vessels.

Nano-titanium dioxide coating: titanium dioxide paint architectural coatings can improve weatherproofing to a new level.The use of nano-titanium dioxide photocatalytic oxidation technology made the atmosphere purification paint, air purification effect of NO is good, but can also degrade other atmospheric pollutants such as halogenated hydrocarbons, sulfur compounds, aldehydes, polycyclic aromatic hydrocarbons .Nano-titanium dioxide photocatalytic composite application process is simple and low cost.

Nano calcium titanate coating: calcium titanate is an excellent filler and a white filler, with cheap, abundant resources, good color, high-grade characteristics.Research shows that nano calcium carbonate-filled paint, its flexibility, hardness, leveling and gloss have a more substantial increase.

Silver nano-titanium dioxide coating:Titanium dioxide under ultraviolet light is weak antibacterial effect is weak, you can indicate precious metal deposition to be modified in order to improve the photocatalytic bactericidal activity, and has excellent bactericidal properties of silver itself, will combine the two, makes titanium dioxide antibacterial performance pole greatly improved.By thermal deposition on the surface of titanium dioxide load a certain amount of silver can improve the photocatalytic antibacterial properties of the particles

 

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Silver nanowires is considered as very promising candidates in flexible electronic

Silver nanowires has been attracting more and more attention because of their intriguing electrical, thermal, and optical properties.Silver has the highest electrical conductivity among all the metals, by virtue of which Ag NWs are considered as very promising candidates in flexible electronics. Ag NWs thin film used as transparent electrode showed equal merit or better than that as compared with sputter-coated ITO in solar cells.

Ag NWs suspension can be directly and uniformly coated onto PET at room temperature without and hydrophilic or hydrophobnic pre-treatment of PET or coating materials, and no surfactants are required. However, the solvents are found to be very important to the uniformity of films. We have dispersed Ag NWs in distilled water, surfactants aqueous, ethylene glycol, methanol, and isopropanol. After 1h sonication, all of these suspentions agglomerated in 5 h. On the other hand, Ag NWs show much better dispersibility, and are easier to re dispersion in methanol and isopropyl alcohol than in aqueous solution.

Using nail polish, NW thin film have not caught up with ITO yet, this proposed fabrication method is simple and easy to be scaled up for large films, which is one of the key issues for applying this technology to commercial applications.

Low temperature solution-deposited Ag NWs networks embedded in ITO-NP matrices demontrate significant improvement in surface morphology, mechanical adhesion, and flexibility while maintaining the sheet resistance and transmittance values necessary to replace conventional sputtered ITO thin films.

 

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Nanometer silver powder is added in the flake silver powder on the influence of conductive colloid volume resistivity

Nanometer silver powder is added in the flake silver powder on the influence of conductive colloid volume resistivity

1. With high density and high integration of the rapid development of the miniaturization of electronic components, miniaturization and the printed circuit board, conductive adhesives because the process is simple, easy operation, high line resolution and less environmental pollution and other advantages become Alternative tin solder, an ideal choice for conductive connection. Conductive paste made of conductive filler, gum base, diluents, tougheners and other additives, wherein the conductive filler of the volume resistivity of the conductive adhesive plays an important role.

2. In practice, a good contact with the conductive filler in order to form a conductive path, in order to achieve this, people try to add a flake, needle or fibrous conductive filler. However, under a transmission electron microscopy revealed: complete conductive gel particles and particle contact and a continuous linear conductive paths there are actually very few particles more than a small gap, this part of the particle is to “tunneling” to obtain a conductive a. Order by “tunneling” to get better conductivity, the distance between the particles must be less than 10 nm, we therefore had to add nano silver in silver flake ideas and research.

3. The results, at a 5% mix of nano silver powder, nanometer silver powder evenly dispersed between silver flake play a very good connection, and improve the conductivity of silver; and the addition of 10% nanometer silver powder mixed powder, many nano-silver reunited increase body resistance between silver.

4. Adding different content of nano-silver powder into flake silver made into conductive adhesive formulated after conducting were studied. Nano silver powder were added at 5% and 10% added to the silver flake, and made of different conductive plastic silver content measured volume resistivity. The results obtained by experimental comparison: 5% nano silver powder mixing ratio of 10% of the mixed powder dubbed nano-silver conductive paste low volume resistivity, good conductivity. The possible reasons are: flow through when approaching a threshold, silver flake still not well connected, adding a small amount of nano powders can help build a conductive network to reduce the volume resistivity; once form a connection, the nano silver particles will increase between the contact resistance.

5. Add different proportions of nano silver in silver flake will change the conductivity thus obtained conductive paste, nanometer silver powder is added generally increases the volume resistivity of the conductive adhesive. However, near the “cross-flow threshold”, the amount of nano-silver is added to form a conductive path; it can reduce the volume resistivity of the conductive adhesive. This study shows that when nano-silver increased amount of 5%, the volume resistivity decreased obviously, silver content of 75% volume resistivity as low as 1.6 × 10-4Ω • cm.

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Nitrogen-doped graphene showed a high electrocatalytic activity

Because graphene is no bandgap, making its conductivity is not the same as a conventional semiconductor completely controlled, and the graphene surface smooth and inert, is not conducive to the composite and other materials, thus impeding the application of graphene.

Hetero atom doping is another effective method for graphene biosensor to improve performance, in which the nitrogen atom in the regulation of carbon-doped material electronic properties play an important role. Scientists graphene nitrogen plasma treatment to prepare nitrogen-doped graphene, this nitrogen-doped graphene reduction of H2O2 showed a high electrocatalytic activity, and to achieve a rapid GOx of direct electron transfer. Nitrogen-doped graphene bandgap can open and adjust the conductivity type, change the electronic structure of graphene to improve the free carrier density graphene to improve conductivity and stability of graphene, in addition, graphene carbon network Introduced nitrogen atom lattice structure, can increase the graphene surface adsorption active sites of the metal particles, thereby enhancing the interaction between the metal particles and graphene.

The role of nitrogen-doped graphene can be introduced in a carbon grid nitrogen-containing functional groups, these functional groups can become active adsorption of metal particles, thereby enhancing the interaction between the metal and the graphene, they can make graphene performance greatly improved, resulting in wide range of applications. Especially as the use of lithium ion batteries, lithium-air battery and supercapacitor electrode materials and fuel cell oxygen reduction catalysts and other new energy materials. In the lithium-ion batteries by doping nitrogen in graphene can throw maintain a high irreversible capacity, etc. at a high charge and discharge rate.

Nitrogen-doped graphene has a high oxygen reduction activity under alkaline conditions. In alkaline fuel cell test found in a wide voltage range of the steady-state catalytic current nitrogen doped graphene electrode is 5 times that of conventional electrodes and a more long-term stability.

In addition, the electrode material can also be used graphene ultracapacitors and other nitrogen doping.

 

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Graphene “King of the material” will Shake the World

Graphene is a single layer of carbon atoms in a two-dimensional structure of the material, it is not only the world’s strongest, hardest, thinnest substance, and because it is aware of the material resistivity minimum, the highest thermal conductivity and, therefore, Ideally electrode and the semiconductor material is considered to lead to revolutionary modern electronic technology and information technology.

Graphene is harder than diamond, with a hundred times of tougher than the best steel in the world so that scientists want to use it for preparing coveted “space elevator” super tough cable. 2020, graphene global market capitalization $ 149 million. Graphene’s future depends on our ability to provide high-end basic materials.

How will the “King Materials” subvert the world

Most people’s experience of using pencil writing on paper is that traces of graphite layers peeled off, when stripped to the minimum limit is only one carbon atom thick single layer of graphite, which is graphene. Surprisingly, this seemingly ordinary matter, because by two University of Manchester scientists Andre Geim and Konstantin Novoselov shared the discovery after the 2010 Nobel Prize in Physics, Since then, it seems that it opens a world of new materials, “Alibaba” door.

“It is the thinnest, the largest stenght of the mechanical material discovered in nature, which can be infinitely stretched, bent to a large angle is not broken, you can also resist very high pressures.” Nobel Laureate Professor Heim said to the reporters.

Graphene is harder than diamond, with a hundred times of tougher than the best steel in the world so scientists want to use it for preparing coveted “space elevator” super tough cable. It stabilizes the lattice structure of the carbon atoms has excellent electrical conductivity, excellent light transmission and a relatively high mechanical strength.

What will be the future development trend of graphene

Many people worry that the year will be like graphene nanomaterials first appeared as yet what the product, the concept of speculation on the fly, reducing the industry credibility; and fear as the photovoltaic industry, as many companies rush optimistic until excess production.

The Chinese Academy of Sciences, and Prof. Dr. Liu Zhongfan Molecular Engineering, Peking University chemistry in an interview with Science and Technology Daily reporter interview that “Graphene is not a very low threshold for the industry! Not everyone can enter, it is technically demanding.” We can say that this is a potential infinite but high-risk industries.

He said: “The current people talk about the future of graphene is still at relatively vague concept, its future development trend, there are three expectations, and with reference to describe the three: the first one is expected silicon, leaving the silicon chip, there is no , while the body of the information society is the chip; the second is a carbon fiber dominate the market in a particular field, such as Toray carbon fiber monopoly for defense; third is plastic, has a hundred years of development history, in people’s lives essential. so, for us, the development of minimum standards graphene is a carbon fiber, in the end, such as plastic, silicon is the highest standard, but this possibility is not known how much. ”

Winning future high-end research

Liu Zhongfan told reporters, “There is no future with graphene, graphene can depend on what made this material, we can provide the base material for high-end. Draw an analogy, you first need to make clothes of high quality cloth we strive to make the best cloth carbon fibers label, graphene material in the future there will be a label, if the former can do 10 years, then, the latter can do for 30 years. What need to do ideal thing is to do like the carbon fiber in Japan technically do dominate the global market. ”

Liu Zhongfan stressed that no carbon fiber graphene wide range of applications, if able to grasp the key graphene, I believe the future is ours. Everyone no doubt that the application of graphene in the future will develop more rapidly, then when who made high-end applications for graphene materials, who is the boss!

Is graphene’s Spring coming?

Held in Qingdao “2015 China International graphene Innovation Conference” drop curtain on the occasion, President of the European graphene flagship program of the Executive Committee, Professor Andrea Ferrari of Cambridge University Graphene Research Center founder and director of the Science and Technology Daily reporter interviewed told when excitedly said that the development in China found that graphene is very fast, last year, only to see a lot of production of graphene material, and this year actually saw related products, such as science and technology development, and manufacturing ene Wang graphene intelligent physiotherapy care waist and fever clothes.

As some experts put it, “graphene spring came not over, and the interpretation of its industrialization is still too early, but the ambience of the spring has come,” can be described as graphene from the outset, along with the question, doubt, combat, and grow, and it’s a skill like pregnant “black gold” will eventually glowing.

Carbon Nanotubes and Conductive Polymer Composites Reinforced composites

Use of carbon nanotubes with good conductivity properties, it can be used as a cathode or instead of the conductive polymer material as a conductive medium to produce high energy miniature batteries. These high energy miniature batteries will not only small, high energy, and life is very long, is used as a portable computer’s power supply and automotive electronic ignition best choice.

If pressed into sheets and carbon nanotubes as a capacitor plate, it can be made into high-energy capacitor. The small amount of carbon nanotubes added to other materials, but also can significantly improve the conductive material, for example, adding a certain amount of carbon nanotubes in the polymer material, polymer material can make the resistivity decreases three orders of magnitude.

Carbon nanotube reinforced composite material using the properties of carbon nanotubes that can produce a lot of excellent properties of the composite material. Such as carbon nanotubes reinforced plastic material excellent mechanical properties, electrical conductivity, corrosion resistance, shielding radio waves. Make use of cement matrix carbon nanotube composites has good impact resistance, anti-static, anti-wear, high stability, easy to impact on the environment. Carbon nanotubes and metal combine to form a metal matrix composite. Such materials have high strength, high modulus, high temperature, thermal expansion coefficient and strong thermal resistance performance.

 

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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 (SNW, silvernano wire) 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:
1.the production process is simple and good rate.
2.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.
3.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.
4.besides excellent electrical conductivity than silver, because of the nanoscale size effect, silver nanowires also have excellent transparency and resistance to flex.
5.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.

Interesting Copper nanoparticles

Copper nanoparticle synthesis has been gaining attention due to its availability. However, factors such as agglomeration and rapid oxidation have made it a difficult research area. Pure copper nanoparticles were prepared in the presence of a chitosan stabilizer through chemical means. The purity of the nanoparticles was authenticated using different characterization techniques, including ultraviolet visible spectroscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and field emission scanning electron microscopy. The antibacterial as well as antifungal activity of the nanoparticles were investigated using several microorganisms of interest, including methicillin-resistant Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, Salmonella choleraesuis, and Candida albicans. The effect of a chitosan medium on growth of the microorganism was studied, and this was found to influence growth rate. The size of the copper nanoparticles obtained was in the range of 2–350 nm, depending on the concentration of the chitosan stabilizer.
Copper nanoparticles are very interesting, not only because they show unique nanoscale phenomena like plasmonic absorption and high surface to volume ratio, but also due to useful properties like antibacterial and fungicidal activity. Copper nanoparticles and metal oxide nanoparticles of copper have widespread commercial presence, especially as fungicides. Copper fungicides are extremely effective against certain species of fungi that are common agricultural pathogens. Copper nanoparticles show good to great antimicrobial property against many pathogenic microbes and also used as a commercial antimicrobial agent. Liquid copper dispersions are used as an antimicrobial spray or to prepare antimicrobial surfaces. Other copper nanoparticle applications include conductive ink, chemical sensors, bio sensors etc. Some of these applications may be difficult for you to reproduce at home.
In acidic conditions, copper metal (Cu) in the anode (copper rod attached to the positive wire of the power supply) oxidizes (loses electrons) to form copper ions (Cu+2). These copper ions are released to the solution and will slowly travel towards the cathode (copper rod attached to the negative wire of the power supply). At the cathode, these copper ions will gain electrons and reduces back to copper metal, leaving a metal deposit on the cathode side. This is the main concept behind, electrodeposition.
However, our system is bit different. We have ascorbic acid; a reducing agent (chemical that can donate electrons to induce reduction) in our solution. Also we heat up the solution to spice things up. Now, for the copper ions that are traveling across the solutions, the journey would not be as easy. This is because, copper ions present the ideal opportunity for ascorbic acid molecules to give off their electrons and reduce the copper ions to copper metal. Therefore, in our system copper particles will be formed well before copper ions reach to the cathode.
Ascorbic acid, will not only function as a reducing agent but also as a capping agent. This means that when small copper particles are formed, ascorbic acid molecules will cap or surround the particle making it difficult for similar copper particles to come near to each other. This prevents the uncontrolled growth of the particles to micron sized dimensions.

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