Posted on

Chinese Scientists Have Made Important Breakthroughs in The Field of Super-strong Carbon Nanotube Fibers

Carbon nanotubes are considered to be one of the strongest materials discovered by humans, with a Young’s modulus of over 1 TPa and a tensile strength of over 100 GPa (the specific strength is as high as 62.5 GPa/(g/cm3). ), more than 10 times stronger than T1000 carbon fiber. Theoretical calculations show that carbon nanotubes are currently the only material that has the potential to help us realize our dream of a space elevator.

How to maintain the excellent mechanical properties of a single carbon nanotube after assembling is the first problem that must be solved in the preparation of super strong fibers. However, the reported strength of carbon nanotube fibers is only 0.5–8.8 GPa, which is far lower than the theoretical strength of carbon nanotubes (>100 GPa). The main reason is that the carbon nanotubes that form fibers are short in length, and the units overlap each other by van der Waals force, which easily slips each other under the action of tension, and cannot fully utilize the inherent high strength of carbon nanotubes. In addition, structural defects and disordered orientations in carbon nanotubes will lead to the decrease of fiber strength. In contrast, ultra-long carbon nanotubes have lengths of centimeters or even decimeters and have perfect structures, consistent orientations, and mechanical properties close to the theoretical limit, which have great advantages in the preparation of ultra-strong fibers.

With the support of the national key R&D program “Nanotechnology”, Professor Wei Fei’s team of Tsinghua University and Professor Li Xide’s team have made a breakthrough in the field of super-strength carbon nanotube fibers. Preparation of ultralong carbon nanotube bundles for theoretical strength. By adopting the method of in-situ airflow focusing, the research team controllably prepared centimeter-scale continuous ultra-long carbon nanotube bundles with definite composition, perfect structure and parallel arrangement, ingeniously avoiding the above-mentioned limiting factors. By preparing ultralong carbon nanotube bundles containing different numbers of units, quantitatively analyzing the effects of their composition and structure on the mechanical properties of ultralong carbon nanotube bundles, a definite physical/mathematical model was established. A “synchronized relaxation” strategy is proposed to release the initial stress of carbon nanotubes in the tube bundle through nanomanipulation, so that it is in a narrow distribution range, and then the tensile strength of the carbon nanotube bundle can be increased to 80 GPa. The above is close to the tensile strength of a single carbon nanotube. The reported tensile strength of ultralong carbon nanotube bundles is superior to all other fiber materials found so far. This work reveals the bright prospect of ultra-long carbon nanotubes for the manufacture of super-strong fibers, and points out the direction and method for the development of new super-strong fibers.

 

As carbon nanotube suppliers, Hongwu Nanomaterial is providing several specs cnts as follows.

1.Single walled carbon nanotube,SWCNTs, D 2nm, L 1-2um, 91%;

2.Single walled carbon nanotube,SWCNTs, D 2nm, L 5-20um, 91%;

 

3.Multi walled carbon nanotube, MWCNTs, D 10-30nm, L 1-2um,99%;

4.Multi walled carbon nanotube, MWCNTs, D 10-30nm, L 5-20um,99%;

5.Multi walled carbon nanotube, MWCNTs, D 30-60nm, L 1-2um,99%;

6.Multi walled carbon nanotube, MWCNTs, D 30-60nm, L 5-20um,99%;

7.Multi walled carbon nanotube, MWCNTs, D 60-100nm, L 1-2um,99%;

8.Multi walled carbon nanotube, MWCNTs, D 60-100nm, L 5-20um,99%;

  1. functionized cnts(-COOH, -OH, -NH2, Ni plated, graphited)
Posted on

Some Functional Materials in Electronic Paste

Electronic paste is made by mixing functional materials with conductive binders or dispersants. It usually has a high concentration of solid particles dispersed in a stable liquid medium for easy coating, spraying, printing, and other operations in the manufacturing process of electronic devices. Its main applications are in printed electronics, solar cells, and nano electronic devices. The following are several main functional materials used for preparing electronic pastes:

 

  1. Metal powder: Metal powder is commonly used as a conductive material in electronic pastes, including silver powder, copper powder,silver copper powder, aluminum powder, etc. They have good conductivity and can be used to prepare conductive components and electrodes.

 

  1. Oxide powder: Oxide powder is commonly used as a dielectric or semiconductor material in electronic paste. For example, ZnO(HW-Z713)powder, TiO2(HW-T681,T685,T689)powder, lithium niobate powder can be used to prepare insulation layers or semiconductor materials for electronic components.

 

  1. Semiconductor nanoparticles: It isa type of material with special electrical and optical properties, often used for specific functional applications in electronic pastes. For example, indium tin oxide (ITOHW-V751) nanoparticles are widely used in the preparation of transparent conductive films.

 

  1. Carbonnano materials powders: Carbon based materials such as graphene powder （HW-C963, C966, C968) and carbon nanotubes have excellent conductivity and mechanical properties, and can be used to prepare high-performance electronic devices.

 

  1. Functional additives: In addition to the main functional materials mentioned above, auxiliary functional additives like surfactants, antioxidantsand rheological modifiers are often added to electronic paste to improve their performance and stability.

Hwnanomaterial supply the materials mentioned above, with reliable and stable product quality and excellent price. Welcome to contact us for further info.

 

Posted on

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.

Posted on

Nano materials in concrete

Application of nanotechnology in concrete

Concrete is the basic building material and widely used in a variety of buildings and structures. Since the 21st century, concrete engineering is upsizing, the engineering environment becomes complicated, and the ever-expanding application fields, people have put forward higher requirements for concrete materials. Nanotechnology can improve the performance of concrete and greatly expand the application.

Nanomaterials can effectively improve the performance of concrete

1. Nano silica/SiO2
Nano SiO2 powder is a superfine powder with silicon or silicone chloride hydrolyzed to form hydroxyl groups on the surface. In the field of cement concrete, nano silica can increase the strength and durability of concrete due to its strong pozzolanic activity, micro-aggregate filling effect and nucleation.

2. Carbon nanotubes
The carbon nanotubes are tubular, light in weight, and the hexagonal structure is perfectly connected, which is a good high-strength fiber material. The proper amount of carbon nanotube powder into the cement can effectively improve the pore structure and microcracks of the material, and play a bridging role, thereby improving the mechanical properties of the cement substrate. get details about carbon nanotubes price from https://www.hwnanomaterial.com/.

3. Nano calcium carbonate
Nano CaCO3 is a low-activity mineral micropowder material with a cost of about one-tenth that of nano-SiO2. After being doped with nano calcium carbonate powder, under the combined action of micro-aggregate effect and crystal nucleus effect, the bulk density is increased, which helps to improve the flexural and compressive strength. The nucleation of nano-calcium carbonate can refine the crystal form, improve the interface structure and improve the durability of concrete.

4. Nano carbon fiber
Nano-carbon fiber is a novel nano-carbon material which is formed by the rolling of a layered graphite sheet. Compared with carbon nanotubes, it has a relatively low cost and has a great advantage in production. Study found that the addition of nano-carbon fiber not only makes the concrete have excellent pressure-sensitive properties, but also improves its mechanical properties.

Nanotechnology expands the application of concrete
1. Concrete that absorbs electromagnetic waves
2. Purifying air concrete
3. Antibacterial concrete
4. Automatic humidity control concrete
5. Ecological concrete
6. Smart concrete

High-performance, high-functionalized concrete as a high-tech in the field of building materials provides a new opportunity for the development of traditional building materials. The development of traditional concrete materials is entering the track of technological innovation. Among them, nanomaterials and nanotechnology will play an increasingly important role in improving the durability and functionality of concrete.

Posted on

Carbon Nanotubes

HW Carbon Nanotubes available in single, multi walled, COOH an OH fuctioned Functionalized CNts, different diameter, length, and purity you can choose. Widely used in many fields by customers around the world.

 

The carbon nanotubes can be filled with metal, oxide and other substances, so that carbon nanotubes can be used as a mold, first with metal and other substances filled with carbon nanotubes, then carbon layer corrodes, a fine nanoscale conductor wires or a new one-dimensional material has been created , can applied in the future molecular electronic devices or nanoelectronic devices. Some of the carbon nanotube itself can also be used as nano-scale conductor wire. Therefore, the use of carbon nanotubes or related technology to prepare micro wires can be placed on a silicon chip to produce more complex circuits.

 

Hydrogen is considered as the clean energy of the future by many people .Hydrogen itself, however, for it’s low density it’s not convenient to compressed into a liquid storage. Carbon nanotubes’ lightweight and hollow structure make it a good reservoir of hydrogen, the density is even higher than the density of liquid or solid hydrogen. Proper heating, hydrogen can be slowly released.

 

The properties of carbon nanotubes can be used to fabricate many composite materials with excellent properties, such as excellent mechanical properties, good electrical conductivity, corrosion resistance and shielding of radio waves with carbon nanotubes materials. Carbon nanotube composites using cement as matrix has high strength, good impact resistance, anti-static, wear-resistant, high stability properties, difficult to impact on the environment.Carbon nanotubes reinforced ceramic composite materials with high strength, good impact resistance.

 

  • Carbon nanotubes also provide physicists with the finest capillaries to study the capillary mechanism, providing the chemist with the finest nanotube reaction tubes. The tiny particles on carbon nanotubes can influence the electric current shaking frequency of the carbon nanotubes. Based on this, in 1999, Brazil and the United States scientists invented a nanoscale of 10-17kg accuracy, able to weigh the quality of a single virus. Then the German scientists developed a single atom can be measured in the ” Nano-scale. “

 

 

Posted on

CNT reinforced matrix, multi-scale hybrid composites carbon nanotubes

Carbon nanotubes (CNT) has a very excellent strength and stiffness. The advantages of carbon nanotubes can be applied to an attractive prospect in the field of macro-engineering. However, numerous studies have found that since the CNT determines its size only as a non-continuous fibers in a matrix, and the effects of poor load transfer between the CNT and the substrate. Thus, a new way of CNT applications have been proposed, namely by the CNT, the traditional continuous fiber and matrix composition of multi-scale hybrid composites to effectively utilize CNT excellent mechanical properties. This material is known as CNT enhanced multi-scale matrix hybrid composites.
CNT reinforced matrix, multi-scale hybrid laminates made of composite materials, both excellent fiber dominated mechanical properties, but also good mechanical properties of the dominant matrix that is suitable for inter-layer load and shock load environments more frequent, such as aviation Spacecraft special environment in which the load; and the application of this composite material in some large holes in the laminate structure, help to improve the strength and fatigue life of the surrounding holes, thereby enhancing the structure and security of the connection. Therefore, the carbon fiber / CNT enhanced multi-scale hybrid composite matrix has become the new frontier in the field of materials research hot spot.

CNT reinforced matrix, multi-scale hybrid composites
Mixing CNT in the matrix can be increased difference in mechanical properties between the fracture toughness, stiffness and strength, balanced matrix continuous fiber reinforced matrix and reinforcing fibers. Improve the mechanical properties of the matrix control, making composite materials fracture toughness; interlaminar shear strength and mechanical properties perpendicular to the inner surface of the continuous fiber direction are greatly improved. However, due to the size of the characteristics of CNT, CNT reinforced so that the mechanical properties of the composite material far less than people expected better.
Many nature biocomposite also belongs to multiscale hybrid composites, such as animal bones, its composition contains a macro component, microscopic and nanoscopic components composition, elements of these different scales ingredients makes bones with high toughness and high stiffness. Inspired corresponding synthetic multiscale composites (with Nano reinforcing phase) have been proposed, there is a multi-scale component so that it has excellent physical and mechanical properties.

CNT properties:
Carbon nanotubes are significantly better than traditional materials in mamy aspect. Treacy and Wong et al found that single-walled and multi-walled carbon nanotubes axial Young’s modulus of up 1TP or more (up to 4.15TPa), and a tensile strength of 100 ~ 200GPa. Yu et al study demonstrated nanotubes having good ductility, in up to 12 percent prior to tensile failure. Vigolo carbon nanotubes and other woven fibers, which have very good flexibility, fracture does not occur it a knot. Carbon nanotubes also have a strong current carrying capacity and thermal conductivity.
CNT matrix composites
The presence of CNT matrix composite material of carbon nanotubes increases the matrix micro crack propagation resistance, thanks to the bridging mechanism of carbon nanotubes. Gojny found that an epoxy resin with 0.5% by weight of amino-functionalized double-walled carbon nanotubes can improve the fracture toughness of 43%. Yu et al epoxy joined the multi-walled carbon nanotubes 1% and 3% by weight, improves the fracture toughness of 29% and 62%; at 8.67MPa and stress amplitude 11.56MPa of 0.5% by weight of multi-walled carbon nanotube / epoxy composites bending fatigue life is 10.5 times the fatigue life of the epoxy resin and 9.3 times. Zhou and other studies of four kinds of weight content (0.1%, 0.2%, 0.3% and 0.4%), multi-walled carbon nanotubes to enhance the mechanical properties of epoxy composites Epon862, the results showed that 0.4% multi-walled carbon nanotube composites Young’s modulus maximum strength and fracture toughness of the strongest 0.3%, indicating that it will not increase the mechanical properties and CNT content and continue to improve. Fiedler other studies confirmed amino-functionalized CNT to epoxy resins open fracture toughness (KIC) has significantly enhanced the effect of the epoxy resin, 0.3% by volume content of amino functional DWCNTs so open fracture toughness increased by 45%. Cadek and other studies show that multi-walled carbon nanotube reinforced polymer composites not only have good mechanical properties and good dispersion in the matrix. Zou and other studies of the epoxy-functionalized MWNTs reinforced epoxy composite, which can effectively improve the tensile strength and tensile modulus. Breton and other surrounding MWCNT reinforced epoxy composite mechanical properties a study and found that the weight content of CNT composites 6% less than the tensile strength of the tensile strength of the CNT content of 3%. However, the CNT load transfer between the substrate and the CNT Central African continuous fibers and the matrix effect is not good, CNT composites reinforced stretch, compress limited mechanical properties of stiffness and strength.

Posted on

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.

 

Related articles: http://www.hwnanomaterial.com/Condutive-Multi-Walled-MWCNTs-Carbon-Nanotubes_p98.html

Posted on

About Carbon Nanotube for Surgery Wound Healing

Carbon nanotubes have many unique properties – they are so many things almost perfect material. They are not only 50 times stronger than steel, they are also lighter by a very substantial. You know, scientists have discovered that a very interesting; carbon nanotubes, graphene coating, the introduction of certain enzymes in the blood to break their bonds, is the blood of animals and humans.

Now then, not long ago, we are talking about this in our Internet style think tank, and I came up with a new innovation, idea, and potential invention in the bioscience and life sciences industry sector. A carbon nanotube patch or carbon nano-tube stitches for Post Surgery wound healing.

You see, Carbon Nano Tubes are decayed by enzymes in blood, and that includes members of the human species or other Earth species with blood, so it is perfect for veterinarians or hospital surgeons. How would this work you ask? Well let me explain it to you;

Since blood causes carbon nano tubes to decay, over a two or three day – as the wound healed the carbon nanotubes would dissolve. Since carbon is part of the human body, and much of any animal species on this planet is carbon based, it wouldn’t hurt anything. In fact, if you coated the carbon nanotube stitches with some sort of antibiotic, you could also solve that problem. Please consider all this.

The carbon nanotube stitches would be shaped like a spring, and you would place a device over the wound pressing the flesh together, and trying to align the skin. Next you would turn on the device, and it would spin this spring forward along the wound, as the front of the spring makes a path for the rest of the spring as it would whirl and twirl itself along and close up the wound.

Lance Winslow is the Founder of the Online Think Tank, a diverse group of achievers, experts, innovators, entrepreneurs, thinkers, futurists, academics, dreamers, leaders, and general all around brilliant minds. Lance Winslow hopes you’ve enjoyed today’s discussion and topic.

Related reading: Single-walled Carbon Nanotubes Silver Nanoparticles Antimicrobial

Posted on

Carbon Nanotubes For Solar Energy Systems

With the high demand of each priority list of alternative sources of energy, in every state of the engineer working with the hope to save the solar energy can provide the enterprises and individuals more gentle. Solar energy technology, and one of the most spectacular improvement is the introduction of carbon nanotubes (hollow tubes of carbon atoms) is a new solar power system. Carbon Nanotubes are not a recent discovery, they proposed a few years ago, they are their own strength promotion. People realize that they can be used in aircraft construction, lighter and stronger cars, buildings, and even soft ball. However, the fact that the new solar energy, carbon nanotube has launched in the solar system the system stored energy level increased in 100 times more common photovoltaic solar cells.

This finding is credited, for the most part, to a group of MIT chemical engineers. Through their research, they found that by using carbon nanotubes, solar energy can be super concentrated. Their studies showed that the nanotubes could form antennas that are capable of capturing and focusing light energy more effectively thus allowing smaller and more powerful solar arrays.

According to a recent study released in the Journal of Nature Materials by Michael Strano, Associate Professor of Chemical Engineering at MIT and the associated research team, the carbon nanotube antenna, or as they call it the “solar funnel”, might also be useful for other applications that require concentrated light. Among these applications, they specifically made mention of night vision goggles and telescopes.

At the most basic level, the way this process works; solar panels generate electricity by converting photons (packets of light energy) into an electric current. The nanotube boosts the number of photons that can be captured and then transforms this increased level of light into energy that can be funneled into the solar storage cell.

What the MIT team accomplished was the construction a special antenna consisting of fibrous ropes, only 10 micrometers (millionths of a meter) long and 4 micrometers thick. Each fibrous rope contained about 30 million carbon nanotubes. These ropes or micro fibers were made up of two layers of nanotubes with different electrical properties or bandgaps*. The inner layer of the antenna contained nanotubes with a smaller bandgap than the outer layer. This is important because excitons flow from high energy to low energy or, in this specific case, from the outer layer to the inner layer where they can exist in a lower, yet still excited, energy state.

So, what does all of this mean? Well, when light energy strikes the antenna, all of the excitons flow to the center of the fiber where they are concentrated and stored. Better methods of energy storage translate to improved efficiency and improved efficiency means more economical energy resources. As solar power becomes more economical more people will migrate to solar panel installation and solar powered homes and businesses.

The electrons can exist at different energy levels of any material existence.When the excitation energy of the electron is more a photon hits the surface in the material level, to be specific, particular material. The interaction between the excited electrons and holes left called excitons. The band gap of the difference between the electron and hole energy levels of labeled.

Related reading: nano powders nano particles

 

 

Posted on

Carbon Nanotube Will Light Up Your Garage

In the car of the future will not be made of steel or aluminum, and even there are so many high-tech plastic Laden. Originally, CNTs Oil Dispersion, when it comes to steel, 50 times of carbon nanotubes are lighter and stronger. Interestingly, they also for power generation, which means it will change as the object, it illuminates not to use too much energy easily. Well, let us be on carbon nanotubes body future conversation.

Although it is not scheduled for discussion at the “Strategies in Light 2013” symposium it appears to me that many of the top automotive innovators are missing some of the future competition in material science. Right now, many cars are being outfitted with LED headlights, and I’m sure you’ve seen how bright they are, or how bright the taillights are when they light up as you’re driving. Some of the younger generation now, put LED lights on the bottom of their cars which looks very cool, merely for affect.

Still, imagine your car is in a parking lot and you can’t find it. Rather than hitting the car alarm and listening for that chirp, chirp – you can have your car light up the parking lot, and even glow-in-the-dark. This might also be good in your garage. You will not need to replace that light bulb on your Geenie garage door opener when it goes out. All you need to do is hit the alarm disarm button, and the car itself, that is to say the car body will light up your garage for you. Best of all, it will hardly take anything away from your battery, as far as energy is concerned.

Some might say; that’s crazy – but that’s only because they do not understand all the characteristics of these new materials. In fact, the hood over your engine, or your trunk may go opaque while driving, but when you hit a button it becomes transparent so you can see in. In fact, the whole body of the vehicle can be created that way as well. Border crossings for trucks may require that trailers in the future are built of carbon nanotube not only so the trucks get better fuel mileage, but also so that border patrol inspections become very easy to conduct.

If you want to discuss all of this in a higher level, you can contact us think-tank, or shoot me an email. As our car carbon nanotube and cross-country truck will be a reality over the next 5 to 10 years. This will improve fuel mileage, and allow us to many other benefits including I just discussed today. I beg you to consider it.