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.

Graphene-Corrine

Graphene! corrosion-resistant property of a human hair thick coating can up to 3000 hours.

The thickness of 100 thousand layer graphene equals to the diameter of one human hair. Well, how it would work if applied on coating?
On the “Nano Graphene modified anticorrosion coating technical report” held in Jiangsu a few days ago, a company brought out a thinnest graphene heavy-duty coating, whose corrosion-resistant property could be up to 3000 hours, which was three times than that of American heavy-duty coating.
It’s all known that to provent metal corrosion is an international problem.The common method of anti-corrosion is to paint the metal to prevent it from contacting with air and water. Such method can only make metal not be corrision in a short time and it requires regular maintenance and has certain limitations.

Graphene is the lightest, thinnest, highest strength, best electrical conductivity and thermal conductivity of nano-scale new materials and can enhance the performance of raw materials in many applications.
Graphene heavy anti-corrosion coating making use of good conductivity and sheet lap characteristics of Graphene, adds the modified graphene into the anti-corrosion coating system, forming a good conductive network with Zinc powder and to achieve a breakthrough that still have excellent cathodic protection and corrosion resistance under the condition of the low Zinc.

According to expert said that the combination of graphene and coating made amount of Zinc nano powder only 1/3 of the traditional corrosion-resistant coating and it dramatically reduced the pollution of Zinc vapor. At the same time, graphene heavy-duty coating is the known thinnest corrosion-resistant coating, which can meet the demand of lightweight coating.

When you buy  Nano Graphene Oxide and other carbon nanomaterials from Hongwu nanomaterial, you can be certain you’re getting the finest product at the best possible price.

Antibacterial Properties of Nano Zinc Oxide Powder

Antibacterial Properties of Nano Zinc Oxide Powder Among the many nano-material antibacterial agents, nano-zinc oxide has a strong inhibitory or killing effect on pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, and Salmonella, and nano-level zinc oxide is a new type of zinc source. With selective toxicity and good biocompatibility, it also has the characteristics of high biological activity, good immunomodulatory ability and high absorption rate, so it has been paid more and more attention by related researchers.

When the particle size is reduced to the nanometer level (20-30nm), the nanoparticle has a higher surface activity and a larger specific surface area, which increases the area of ​​contact and reaction with the bacteria, so the toxicity of the nano-zinc oxide to the bacteria shows To find out a certain particle size dependence, the researchers studied the inhibitory effects of six different sizes of zinc oxide particles on the growth of Staphylococcus aureus, and found that when the particle size of nano-zinc oxide is >100nm (concentration is 6mmol.L-1) ), there is no obvious growth inhibitory effect on Staphylococcus aureus, and when its particle size is less than 30nm, it not only inhibits the growth of the bacteria, but even has a lethal effect on it.

Antibacterial mechanism of nano-zinc oxide
At present, there are many research reports on the antibacterial or sterilization of nano-zinc oxide. The existing literature mainly summarizes its antibacterial or sterilization mechanism into three aspects:

1. Release of free Zn2+;
The metabolic balance of the metal ion ZN2+ is essential for the survival of bacteria. Studies have shown that nano-zinc oxide slowly releases ZN2+ in an aqueous medium, and ZN2+ can penetrate the cell membrane to enter the cell, and while destroying the cell membrane, it reacts with certain groups on the protein to destroy the structure and physiological activity of the bacteria. It enters the enzyme that destroys the electron transfer system in the bacteria and reacts with -SH to achieve the purpose of sterilization, and after killing the bacteria, ZN2+ can be freed from the cell and repeat the above process.

2. The interaction between nanoparticles and the surface of bacteria;
The antibacterial properties of metal oxides can also be attributed to the interaction between nanoparticles and the surface of bacteria, which in turn causes damage to the surface of bacteria.
Researchers studied the effect of nanometer zinc oxide on the growth of Escherichia coli. The results show that when the pH value is 7, the potential of nano-zinc oxide is +24mV. When the surface of Escherichia coli produces a large amount of amide due to the hydrolysis of lipopolysaccharide, the bacterial membrane is negatively charged, and it is produced between the oppositely charged nano-zinc oxide Electrostatic attraction leads to a close association between the two and damages the surface of the bacteria, which in turn leads to the rupture of the bacterial membrane and ultimately the death of the bacteria. When the nano-zinc oxide particles interact with Campylobacter jejuni, the nano-particles can also cause changes in the morphology of the bacteria and leakage of the contents, and induce an increase in the expression of oxidative stress genes in the organism. The above studies have shown that the antibacterial properties of nano-zinc oxide are closely related to the interaction between the particles and the surface of the bacteria.

3. The generation of ROS reactive oxygen free radicals.
Metal oxide particles generate ROS (such as hydrogen peroxide, hydroxyl radicals, oxygen anions and hydroperoxides) in cells are also an important toxicity mechanism. The ROS induced by nanoparticles has been generally considered to be a common form of particle induction. The induced ROS can cause a series of biological reactions, such as damage to the bacterial membrane, which can cause lysis or promote the aggregation of nanoparticles in the bacterial body. Eventually cause the bacteria to die.
Nano-zinc oxide particles have photocatalytic properties, which can produce optical toxicity and cause lethal effects on bacteria under the irradiation of visible light or ultraviolet rays.
The researchers selected Escherichia coli and Bacillus subtilis as the test bacteria, and studied the damage degree of nano-zinc oxide to the two bacteria under light and dark conditions, respectively. It was found that the photocatalytic activity of the light-induced particles caused bacterial membrane breakage and DNA damage. At the same time, it was observed by SEM that the cells were sunken or only degraded bacterial membrane remained due to the leakage of bacterial contents.

Nano-zinc oxide is being widely used in the fields of animal husbandry, textiles, medical treatment, cosmetics and food packaging. The antibacterial effect of nano-zinc oxide is mainly concentrated on bacteria, such as Staphylococcus aureus and Escherichia coli, and shows good in vitro antibacterial applications. Get more information form  https://www.hwnanomaterial.com/.

 

Nanomaterials have been used to produce different types of leather

Leather finishing is a very important operation in the manufacture of leather, in which a variety of different chemicals are used. The introduction of nano-materials in leather finishing has revolutionized the leather industry, and nanomaterials have been used to produce a variety of different types of leather to meet the diverse needs of consumers. The purpose of this study is to combine leather science and nanotechnology to achieve superior performance with superior characteristics. TiO2 nanoparticles are widely used in many fields, such as antibacterial agents, super-hydrophilic materials, water vapor permeable materials, solar cells, ultraviolet absorbers, catalytic materials, plastics, fibers, controlled release, pigments, thermal insulation materials, coating Layer adhesive, self-cleaning coating, scratch resistant anti-wear material, etc. The use of nanomaterials in leather finishing has a strong durability that helps the leather withstand the test of time.

 

(1) TiO2 nanoparticles show better adhesion after coating on leather. The improvement in adhesion is due to the fact that the TiO2 nanoparticles used in the finishing formulation promote the reactivity of the binder, other finishing aids and the leather matrix due to the greater specific surface area.

(2) Adhesion is also related to the interfacial force. The polar molecules of the binder are in closer contact with the nano-TiO2 particles, promoting interatomic and intermolecular forces, resulting in better adhesion, strength, and diffusivity.

(3) The very large specific surface area of the nano TiO2 particles contributes to the adsorption of other coating materials and can increase the reaction performance. And the nano-TiO2 particles can enter the gap between the leather fibers to have a strong interaction with the leather fibers to improve the adhesion performance.

(4) The use of TiO2 nanoparticles in the finishing formulation gives the leather better physical properties, good sensory properties (the coating gloss is medium with nano-TiO2, the leather gloss is higher without using TiO2 nanoparticles) and better Chemical properties. Nano-TiO2 provides better hiding performance, filling performance and bonding performance (the best nano-TiO2 dosage is 0.1~2 g/L).  Select nanoparticle companies from https://www.hwnanomaterial.com

Transparent Thermal Insulation Nano Materials

Nano thermal insulation coating can effectively block infrared and ultraviolet rays in sunlight. When sunlight penetrates the glass and enters the room, it can block more than 99% of ultraviolet rays and block more than 80% of infrared rays. Moreover, its heat insulation effect is very good, can make the indoor temperature difference 3-6˚C, can keep the indoor cool air.

Nano thermal insulation coating is also a very environmentally friendly material, mainly because the coating film does not contain benzene, ketone and other ingredients, nor does it contain other harmful substances. It is truly green and environmentally friendly and meets international environmental quality standards.

There are three transparent Thermal Insulation Nano Materials

1. CS0.33WO3 Cesium-doped tungsten oxide nanoparticles
CS0.33WO3 Cesium-doped tungsten oxide nanoparticles(Cesium tungsten bronze )transparent nano thermal insulation coating stands out from many transparent thermal insulation coatings due to its environmental friendliness and high thermal insulation characteristics, and currently has the best thermal insulation performance.

2. ITO nanoparticles
Nano-ITO (In2O3-SnO2) has excellent visible light transmittance and infrared blocking characteristics, and is an ideal transparent thermal insulation material. Since indium metal is a scarce metal, it is a strategic resource, and indium raw materials are expensive. Therefore, in the development of transparent heat-insulating ITO nanoparticles coating materials, it is necessary to strengthen process research to reduce the amount of indium used on the premise of ensuring the transparent heat-insulating effect, thereby reducing production costs.

3. Nano ATO
Nano-ATO antimony-doped tin oxide coating is a kind of transparent thermal insulation coating material with good light transmittance and thermal insulation performance. Nano antimony tin oxide (ATO)  has good visible light transmittance and infrared barrier properties, and is an ideal thermal insulation material. The method of adding nano ATO powder antimony to the coating to make a transparent thermal insulation coating can effectively solve the thermal insulation problem of glass. Compared with similar products, it has the advantages of simple process and low cost, and has extremely high application value and broad application.

Get more  tansparent thermal insulation Nano materials  from www.hwnanomaterial.com quickly!

Nano silver wire is used for transparent conductive film

Characteristics of nano silver wire:

1. Silver nano wire has high specific surface area, electrical conductivity and thermal conductivity.
2. Nano silver wire has surface plasmon effect: Surface plasmon refers to the electron density wave propagating along the metal surface generated by the interaction between freely vibrating electrons and photons that exist on the metal surface.
3. Silver is a good conductor of electricity, with low resistivity and high conductivity. Applying nano-silver wires to the conductive layer will draw out the collected current, which can reduce energy loss compared with TCO semiconductors.
4. If nano silver wires with a particle size smaller than the incident wavelength of visible light are used, the silver wires can be arranged very densely, and this technology can increase the current collecting area of ​​the silver electrode of the solar cell. It does not block the transmission of light, and at the same time, it can fully absorb light energy by taking advantage of the characteristics of light diffraction.

For transparent conductive film applications:
Due to its nanostructure size effect, nano silver wire has the characteristics of good conductivity, excellent light transmittance, flexibility and wide source of raw materials. The flexible TCF prepared with nano silver wires has the advantages of high transparency, low square resistance, good flexibility, low price, simple process, etc., and is considered to be the next generation of new materials in the field of flexible transparent conductive films.
After years of development, the preparation methods of nano silver wire flexible transparent conductive film mainly include spraying method, spin coating method, Meyer rod coating method and screen printing method. According to different manufacturing methods, the addition amount is different.
AgNWs flexible TCF is favored by the optoelectronic industry due to its excellent optical properties, electrical conductivity and flexibility, and is a new direction for industrial development.
In addition to the excellent conductivity of silver, nano-silver wires also have excellent light transmittance and flexibility due to the nano-level size effect, which provides the possibility to realize flexible, bendable LED displays, touch screens, etc., and A lot of research has applied it to thin-film solar cells. In addition, due to the large aspect ratio effect of silver nanowires, it also has outstanding advantages in applications such as conductive adhesives and thermally conductive adhesives.

The length of the nano silver wire produced by our Hongwu Nanomaterials Company is generally greater than 20 microns, and other lengths can also be customized. If you are interested in this, welcome to consult us.

Related products: metal nanowiresilver  nanopowder

Nano Au for Biomedical Applications

The biomedical field is a brand-new research field formed by integrating the methods and theories of medicine, biology and other related disciplines. Its research contents include bio-medicine, clinical applied chemistry, cytology and immunology, etc. With the rapid development of technology, many cutting-edge research and inventions in hot areas have played an important role in the field of bio-medicine, such as digital holography, virtual reality, and nanotechnology. It can be said that bio-medicine is an important area related to human beings. Studies have shown that surface-modified nano-gold particles can play a very important role in cell imaging, drug carriers, and many other aspects, its performance is closely related to the structure of nano-gold composition, morphology, size and size. More attention is paid to the appearance of gold nano structures such as rods and spheres.

 

Nanomaterials are materials in which at least one dimension in the three-dimensional space is in the nanoscale range or consists of them as basic units. Nano gold is a kind of nano material and is a gold nano particle with a diameter of 1-100nm. Nano-gold particles play an important role in molecular detection, photo-thermal therapy, tumor diagnosis, and green catalysis. In the following, I will give a detailed review of the field of bio-medicine.

 

  1. Application in bio-moleculardetection and identification

The emergence of nano gold immunolabeling technology in 1971 made it possible to see the great potential of nano gold as an immunological marker. After decades of continuous development, the immunolabeling technology using nanogold as a marker has basically matured. Has become one of the four major immunolabeling technologies. With the advancement of science and technology, people have a deeper understanding of the physicochemical properties of Gold nanoparticles dispersion , thus further expanding the biometric detection technology using nano gold as a marker. At present, nanogold is mainly used in biological detection to detect nucleic acids and proteins. Based on its unique surface plasmon resonance effect, catalytic properties, and high-density properties and other physicochemical properties, nano gold has unparalleled advantages in other areas of biological detection, and it has great potential for early diagnosis of tumors.

 

  1. Application in cell imaging and photothermotherapy

The strong scattering of nano gold particles was first used by researchers in the field of nano gold cell imaging and is still the most commonly used nano gold cell imaging method. As long as the diameter of the nano gold particles is greater than 20nm, it can be easily observed in a dark field scattering microscope. Compared with common fluorescent groups, nano gold particles can stably scatter light for a long time without being bleached. At the same time, due to the surface plasmon resonance effect of the nano-gold particles, the molecular electromagnetic field signal will be enhanced if it is within the nano gold surface or within 10 nm from the nano gold surface. Through the extraction of these enhanced electromagnetic field signals, Can be applied to bio-imaging technology. Because nano gold’s two-photon luminescence imaging technology has a much higher signal-to-noise ratio than dark-field microscopy, it has a very high potential for intracellular imaging. In addition, nano-gold particles can produce high thermal behavior by absorbing near-infrared light, a feature that makes it play a significant role in photothermal therapy in medicine.

 

  1. Application in drug delivery and controlled release

The specific surface area of ​​nano gold is relatively large, and its surface is easily modified. The drug can easily bind to the nano gold surface after chemical bonds and non-chemical bonds, thereby forming a nano gold drug-loading system. The drug-loading system formed by nano gold has the characteristics of increasing drug solubility, increasing cytotoxicity, and increasing drug stability. Currently, nano gold has been widely used in various fields of bio-medicine as a carrier for various types of drugs. The use of nano gold as a drug carrier can both protect the drug, increase the activity of the drug, reduce the amount of the drug used, and reduce the medical cost.

Related Tags: Nano gold colloid  Nano Gold dispersion

Carbon nanotubes are used in batteries

Lithium iron phosphate power cell is the most potential lithium-ion power battery for electric vehicles in the market, which has the advantages of good safety, long cycle life, and high energy density. However, lithium iron phosphate has poor electrical conductivity and conductive agent must be added to improve its conductivity. Most commonly used conductive agents are carbon black and graphite, which is cheap. However, in the process of multiple charging and discharging, the expansion and contraction of graphite materials reduces the contact between graphite particles, increases the gap, and even separates from the collector fluid and no longer participates in the electrode reaction. Therefore, the choice of conductive agent has an important role in improving battery performance.
At present, carbon nanotubes(CNTs) have gained wide attention in the application of conductive agents due to their excellent physical and chemical properties. The conductive mechanism of carbon nanotubes is that because they belong to one-dimensional nanomaterials, the length-diameter ratio is relatively large, which is good for the formation of conductive networks, and can improve the bonding between active materials and their collective flow, also it play the role as a physical adhesive. At the same time, it has excellent mechanical properties and chemical inertia, and it also has good thermal conductivity. It can improve the specific capacity and cycle life of the battery and improve the high temperature performance. It is an ideal new type of conductive material for lithium ion batteries.
In the experiment, multi-wall carbon nanotubes were applied to the positive and negative poles of lithium iron phosphate batteries respectively, and different tired batteries were prepared. The conventional performance and doubling rate were tested, and they were compared with the cores prepared by ordinary conductive carbon black. The test results show that, The electric core of high-conductive multi-wall carbon nanotubes added to the carburetor nanotubes has better conventional performance and double discharge performance than the conventional core, and the double discharge effect of both positive and negative poles is the best, followed by the addition of negative poles. The addition of MWCNTs to the negative electrode also shows the same situation. After the negative electrode capacity increases, it can embed more lithium ions when charging, which is conducive to the increase of discharge capacity, and because multi-walled carbon nanotubes have better electronic transport capabilities. In addition, more continuous conductive networks are formed in the click, which reduces the number of active substance particles encouraged. Also, the positive pole is added. The carbon nanotube, in high purity, is easy to disperse, has a low resistivity and can reach a resistivity of 650 μΩ. M, which is very suitable for battery use.
Multi-wall carbon nanotubes for lithium iron phosphate batteries
The addition of carbon nanotubes also has an important influence on the electrochemical performance of lead acid battery negative plates. After adding CNT, it can increase the amount of liquid absorption of the electrode, improve the transmission performance of the electrolyte in holes, and also improve the negative electrode conductivity, enhance the charging and discharging ability, improve the morphology and utilization rate of the active material, and slow down the salt of the negative electrode. In partial charge state, the rapid discharge cycle life of the plate can be extended. The negative electrode is added to the CNT battery prepared by 0.5 % CNT. When the SBAS0101 is rapidly charged and discharged under 50 % charge state, the battery discharge termination voltage is increased and the cycle life is extended.

Related Tags:Transparent Silver Colloid  Colloidal Gold

Conductive and antistatic nanomaterials commonly used in the textile and chemical fiber industry

The development of nanotechnology and nanomaterials provides new ways and ideas for the development of anti-static products. The special conductivity, electromagnetic properties, super-absorb ability and wide band of nanomaterials have created new conditions for the research and development of conductive absorbing fabrics. Due to the electrostatic effect, chemical fiber clothing and chemical fiber carpets have a discharge effect when rubbed, and at the same time, it is easy to adsorb dust, which brings a lot of inconvenience to the user; some operating platforms, cabin welding and other first-line work sites are prone to sparks due to static electricity, causing an explosion. . From the perspective of safety, it is an important task to improve the quality of chemical fiber products and solve the problem of static electricity.

If connected to the resin with nano-powders with semiconducting properties ( such as nano-TIO2, nano-ZNO and nano-FE2O3) , the resin will have electrostatic shielding performance, which greatly reduces the electrostatic effect and greatly improves the safety factor.

The anti-static master batch prepared by dispersing the multi-walled carbon nanotubes in the self-made anti-static carrier PR-86 can produce an anti-static PP fiber with excellent performance. The presence of multi-walled carbon nanotubes enhances the degree of polarization of the microfiber phase and the antistatic effect of the antistatic master batch. The antistatic properties of polypropylene fibers and the antistatic fibers made from polypropylene blends can also be improved by using carbon nanotubes.

The use of nanotechnology to develop conductive adhesives and conductive coatings, surface treatment of the fabric, or the addition of nano-metal powder during the spinning process to make the fibers conductive. For example, in the antistatic agent for polyester–Nano-doped tin dioxide (ATO) finishing agent, a reasonable stable dispersing agent is selected to make the particles mono-disperse, and the anti-static finishing agent is used to treat the polyester fabric, and the surface resistance of the fabric is The unprocessed >1012 Ω level is reduced to the order of <1010 Ω, washing 50 times, the antistatic effect is basically unchanged.

The conductive fibers with good performance include black conductive fibers with carbon black as conductive material and white conductive fibers with white powder materials such as nano SNO2, nano ZNO and nano TIO2 as conductive materials. The white-tone conductive fiber is mainly used for making protective clothing, overalls and decorative conductive materials. Its color is better than that of black conductive fibers, and its application range is wider.

Related Tags:Nano silver colloid  Silver nanoparticles dispersion

purple tungsten anode material

WO2.72’s purple finely divided crystalline powder, which is a purple tungsten oxide that can be used in negative electrode materials, which can help lithium-ion batteries achieve ultra-fast charging, so that high-power density battery devices can be constructed to achieve smaller and lighter Device.

Purple tungsten oxide has a very high chemical activity and enhances electron conductivity. The material has a small internal resistance and excellent Li ion diffusibility. In particular, it has excellent discharge characteristics in a low-temperature environment, and has a rate characteristic equal to or higher than that of a double-layer capacitor (EDLC) discharge even at -40 °C. Previously, the rate characteristics of Li ion secondary batteries and Li ion capacitors at low temperatures have been an unsolved problem.

A battery with a new material is characterized by a power density and an energy density that can be increased to two to three times that of a double layer capacitor. Energy density is also improved compared to lithium ion capacitors designed to increase the energy density of EDLC. In the field of capacitors, Li-ion secondary batteries are not suitable for high-output applications due to insufficient output power and development difficulties, and the development of such batteries will make it possible to use batteries in high-output power applications.

It is said that the new battery materials are very likely to be officially put into commercial use, which may further expand the demand for tungsten oxide. The application advantages of lithium batteries using new materials are quite obvious, ranging from automobiles, micro/mild hybrid trains, elevators, uninterruptible power supply UPS to high-current power supplies.

Related Tags:Colloidal Silver  Antibacterial nano silver dispersion