April 2020 – Silver Nanoparticles Antimicrobial,Copper Oxide Nanoparticles,Gold Nanopowder

April 30, 2020

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.

April 24, 2020April 30, 2020

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.

April 22, 2020

ATO nanopowder applied for anti-static fiber

Nano-inorganic powder modified fiber materials are gradually becoming an important development direction of fiber material modification. Compared with other types of anti-static fibers, nanoscale metal oxide anti-static fibers have many unique excellent properties, such as being unaffected by climate and use environment, and good stability; nanoscale metal oxides are not easy to get from fibers. Shedding, the distribution is relatively uniform; the fiber preparation process is simple; the fiber is used in a wide range, and it can be used in any occasion where anti-static is required. The new nano-scale transparent conductive powder is prepared for the transparency and excellent electrical conductivity of the product. It is favored by people. There are three main ways to use nano-ATO for anti-static treatment of chemical fiber:

1) Adding nano ATO powder directly during fiber spinning, the key is the compatibility of inorganic nano ATO with fiber material, and special dispersing aid needs to be added;

2) Adding nano ATO or its aqueous suspension during the dyeing process of raw materials (such as tops and polyester filaments) to complete the dyeing and functionalization in one step;

3) Adding a nano-sized ATO aqueous suspension to the dyeing or finishing process of the grey fabric.

Wang Dong and others of the State Key Laboratory of Fiber Modification of Donghua University used nano powder ATO powder as anti-static agent and polyethyleneimine (PEl) as dispersant to stably and uniformly disperse nano-ATO in deionized water. For the first time, the suspension was used as a preheating bath for the spinning process of polyacrylonitrile fibers to improve the anti-static property of PAN fibers. Due to the difference in concentration of nano-inorganic particles inside and outside the fiber and the presence of a large number of micropores inside the primary PAN fiber, the nano-ATO particles can diffuse, migrate into the fiber or adsorb to the surface layer of the fiber. When the PAN fiber is stretched, dried, and densified, The nano ATO can remain in the fiber and form a conductive channel for the partial contact of the nano ATO, imparting anti-static properties to the PAN fiber. The experimental results show that the volume resistivity of nano-ATO modified PAN fiber decreases by three orders of magnitude, has good anti-static properties, and basically maintains the original mechanical properties of the fiber. In addition, the National Ultrafine Powder Engineering Research Center is also conducting research on the application of nano-ATO in the preparation of anti-static fibers and other fields.

At present, the most important method to improve the electrostatic properties of polyester fabrics is to use an organic anti-static agent for anti-static finishing through a simple fabric finishing technique. However, since organic anti-static agents have a large dependence on environmental humidity and poor durability of anti-static effects, an anti-static agent having excellent and durable anti-static properties has been sought as a research and development hot spot. Wu Yue et al. Emi used nano ATO powder for anti-static treatment of polyester fabrics. The experimental results show that the surface resistance of polyester fabric treated with nano-ATO anti-static finishing agent is reduced from untreated >1012 Ω to <1010 Ω, washing 50 times. The anti-static effect is basically unchanged. Chen Xuexue et al. “The anti-static function of nano-scale ATO anti-static agent on polyester fabric was coated by coating method. The experimental results show that only when ATO particles are exposed on the surface of the film, it can exert anti-static performance; when ATO When the particles are partially immersed in the film and partially exposed in the form of the film surface, the anti-static property of the film is long. Ding Zhongfu et al. used nano-ATO powders with different cerium doping amount for the anti-static treatment of polyester knitted fabrics. Studies have shown that the doping amount of powder is one of the main factors affecting anti-static properties, and is doped at 4%-8% antimony. Within the range of the test, the more the doping amount, the better its anti-static property, but the color of the powder will also deepen, which will affect its use on light textiles.

Fiber functionalization is an important development trend of synthetic fibers. China is a large country in the production and consumption of chemical fiber. anti-static treatment of chemical fiber will be one of the important application markets for nano ATO powder.

April 10, 2020

Application of Nano Titanium Nitride in Electrochemistry

Nano titanium nitride can be dispersed in other materials to form a conductive network due to its small particle size and large specific surface area, which greatly improves the electrical conductivity of the composite. Therefore, nano titanium nitride is a material with broad application prospects. Among them, the application of nano titanium nitride TIN in electrochemistry is as follows:

1) Application in fuel cells

1 nano TiN as electrode catalyst carrier material

As a carrier material for the electrode of a fuel cell, nano titanium nitride TiN not only improves the electrooxidation ability of the anode to organic fuel such as methanol, but also improves the electroreduction catalytic performance of the cathode for oxygen, and synergistic effect with the platinum Pt. The corrosion resistance and long-term stability of the electrode are greatly enhanced, and the performance of the fuel cell is greatly improved.

Application of nano TiN in bipolar plate materials

The metal materials generally used as the plates include Ti, Al, and stainless steel, and the disadvantage of using the metal plates is that the corrosion resistance is relatively poor, which cannot meet the long-term stability of the fuel cell. TiN has high electrical conductivity, corrosion resistance, oxidation resistance and excellent mechanical properties. It is suitable for composite modification of metals such as Ti, Al and stainless steel to improve the corrosion resistance and electrical conductivity of bipolar plates.

2) Application in super-capacitors

Various nano structured TiN with excellent electronic conductivity and high specific surface area, such as nanotube arrays, nanowires, nanorods, and core-shell structures, can improve the capacitance performance and cycle stability of super-capacitors.

3) Application in lithium ion battery

As a carrier material for lithium-ion batteries, TiN not only improves the conductivity of the electrode, but also greatly increases the diffusion coefficient of lithium ions, thereby improving the capacity, rate and stability of the battery. It is widely displayed in lithium-ion batteries. Application prospects.