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Cerium dioxide CeO2 anti-ultraviolet

Ceria (CeO2) has good anti-ultraviolet ability. The strength of CeO2’s anti-ultraviolet ability is related to its particle size: when the particle size is large, the anti-UV performance is mainly based on reflection and scattering, and it is effective for both medium-wave and long-wave ultraviolet rays, but the anti-ultraviolet ability is relatively weaker; when the particle size decreases, light can pass through the particle surface, and the reflection and scattering of long-wave ultraviolet rays are not obvious, and the small size effect and quantum size effect of the particles cause the absorption band to have a “blue shift” phenomenon, moving toward the short-wave direction, that is, the absorption of medium-wave ultraviolet rays is significantly enhanced, and the anti-UV ability is improved. Nano cerium dioxide has a small particle size with high activity. It can reflect and scatter ultraviolet rays, as well as absorb ultraviolet rays, so it has a stronger shielding properties against ultraviolet rays. When the nano sizes reach a certain small extend and are evenly and stably dispersed, nano ceric oxide has better ultraviolet shielding performance, increasing light quantum efficiency, absorption rate of ultraviolet rays, and can greatly improve visible light transmittance.

Compared with zinc oxide(ZnO) and titanium dioxide(TiO2), cerium dioxide has two advantages in anti-ultraviolet: first, its refractive index is lower than the other two, making the whiteness more natural; second, the UV light it absorbs is mainly through the transition of electronic energy levels, which will not cause photocatalysis, making it an ideal broad-spectrum inorganic ultraviolet shielding material.

Currently, nano cerium dioxide with excellent anti-ultraviolet performance is often used in the following fields:

Coatings: It can be considered to be added to the coating in combination with other materials. While playing an anti-ultraviolet effect, it can also improve aging resistance, mildew resistance, enhance the tensile strength and elongation at break.

Glass: Glass with the addition of cerium dioxidenanopowdercan not only enhance the shielding of glass against ultraviolet rays, but also improve the clear effect of glass.

Textiles: Textiles with the addition of nano cerium dioxide have significantly improved anti-ultraviolet performance, and the effect is still lasting after multiple washings.

Sunscreen products: Good transparency, good anti-ultraviolet effect and show more natural color.

The research on the anti-UV properties of nano cerium dioxide is still deepening, and its application is constantly improving. It is believed that in the future, the use of nano cerium dioxide will be more extensive and its advantages will be further utilized.

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Nano AZO powder，ZnO:Al2O3=99:1, 30nm, 99.9%

I. Outstanding Properties of nano AZO

  1. Excellent Electrical Conductivity: After aluminum doping, the crystal structure of AZO undergoes subtle changes, significantly increasing the electron mobility. This enables AZO to possess good electrical conductivity while maintaining a certain degree of transparency. Its resistivity can be as low as the order of 10⁻⁴Ω·cm, giving it a distinct advantage in the field of transparent conductive materials.
  2. High Transparency: In the visible light range, AZO nanoparticles have very low light absorption and scattering, achieving a light transmittance of over 85%. This property makes it an ideal choice for numerous applications that require transparency and electrical conductivity, such as transparent electrodes and display devices.
  3. Good Chemical Stability: Zinc oxide itself has certain chemical stability, and the doping of aluminum further enhances the chemical inertness of AZO. It can remain stable in various chemical environments, being resistant to oxidation and corrosion. This provides a strong guarantee for its application in various complex environments.
  4. Strong Ultraviolet Absorption Ability: AZO has a strong absorption effect on ultraviolet light, especially in the ultraviolet band of 200 – 400nm. This property gives it broad application prospects in fields such as sun protection and ultraviolet shielding, effectively protecting the human body and materials from ultraviolet damage.

II. Wide Applications of Nano AZO

  1. Solar Cell Field: As a transparent conductive electrode material, Nano AZO can efficiently collect and transport photo – generated carriers, improving the photoelectric conversion efficiency of solar cells. Its good electrical conductivity and high transparency help reduce the internal resistance loss of the battery, enabling more light energy to be converted into electrical energy. Currently, many research teams are committed to optimizing the application of AZO in solar cells to promote the widespread use of solar energy, a clean energy source.
  2. Display Technology Field: In display devices such as liquid crystal displays (LCDs), organic light – emitting diode displays (OLEDs), and touchscreens, AZO is widely used in the preparation of transparent conductive films. It can not only achieve clear and bright image display but also improve the touch sensitivity of the screen, bringing users a more smooth interactive experience. With the continuous development of display technology, the performance requirements for AZO materials are getting higher and higher, and related research and innovation are also ongoing.
  3. Building Energy – Saving Field: Adding AZO nanoparticles to building glass or coatings can prepare intelligent building materials with functions such as heat insulation, thermal insulation, and ultraviolet protection. This material can effectively block the heat and ultraviolet rays in solar radiation from entering the room, reducing the air – conditioning energy consumption of buildings and providing a more comfortable and healthy indoor environment. In an era of advocating energy conservation and emission reduction, the application prospects of AZO in the construction field are very broad.
  4. Other Fields: In addition to the above – mentioned main application fields, AZO also shows great application potential in sensors, catalyst carriers, antibacterial materials, etc. For example, the gas – sensitive sensor based on AZO has high sensitivity and fast response characteristics to various harmful gases and can be used for gas detection in environmental monitoring and industrial production. As a catalyst carrier, AZO can improve the activity and stability of the catalyst, playing an important role in fields such as chemical synthesis and environmental protection.
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The application of nano-titanium oxide in textiles

Nano-TiO2 has attracted much attention due to the advantages of cheap and non -toxic, small particle size, large surface area, high catalytic activity, good absorption performance, strong absorption of ultraviolet capacity, large surface activity, and good stability. At present, TIO2 mainly has the advantages of anti -ultraviolet, antibacterial, anti -static, anti -static, anti -aging, and self -cleaning.

1. Anti -ultraviolet rays

Nano -TiO2 is widely used as anti -ultraviolet absorbers to synthetic fiber fabrics such as polyester, natural fiber cotton fabrics and composite materials. There are experiments to use nano -TiO2 to organize polyester fabrics. The fabric has a good anti -ultraviolet absorption performance, has a good washing resistance, and has a small impact on the rigidity, breathability and strength of the fabric.

2. Antibacterial performance

TIO2 is widely used in textiles as a new type of inorganic antibacterial agent. Its antibacterial performance is widely speined, durable, and safe, and its optical chemical stability is excellent, non -toxic and cheap.

The nano -level TIO2 particles have strong antibacterial properties under the light, and with the increase of antibacterial concentration and light time, the antibacterial rate is increased, and the antibacterial effect is significantly strengthened. It is feasible to treat the nano -TiO2 on the fabric with the soaking method, and the processed fabric has obvious antibacteriality, but the adhesive and dispersant need to be added to improve the combination of TIO2 and fabric. After adding adhesives and dispersing agents, the antibacteriality of the fabric has good water -resistant performance.

3.Anti -static performance

Plants’ anti -static electricity consolidation is to quickly transmit and consume the charge through the conductive of the material, so as to achieve the effect of anticidering. At present, the nano -materials in textiles are mainly TIO2, Zno, graphene, etc.

4. Extraction performance

Add nano TiO2 to chemical fibers, and chemical fibers can be gone. At present, TIO2 is mainly used in polyester fibers as a elimination agent, and has extremely high opaque. The chemical properties are stable, the heat resistance is good, and it is easy to disperse in the original liquid and fiber. It does not affect the strength of the fiber and after the fiber is processed after the light.

5.Anti -aging performance

Many chemical fiber textiles will cause degradation of molecular chain under ultraviolet rays, generating a large amount of free radicals, which greatly affects the color and strength of the textiles. Studies have shown the effects of golden stone nano -titanium dioxide and other effects on the aging performance of high -density polyethylene (HDPE)/wood fiber composite materials. Test results: Nano -titanium dioxide can play a significant anti -aging effect on composite materials.

6. Self -cleaning performance

Nano -TiO2 is stimulated by ultraviolet rays, with strong photocatalytic performance and can oxidize and degrade dirt. Researchers have found that the special interface formed by TIO2 nano -particle sprayed on the material can make the surface of the material present the extraordinary double sparse (hydrophobic and oil). Various textile fabrics processed showed excellent water and oil -refusted. The original physical and chemical properties of fibers such as fiber strength, affinity of dyes, and breath-ability of the fiber have no effect.

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Performance, Application and Development of Nano Nickel-Titanium Memory Alloy Powder

It is common for people to have memory, but it is amazing that metals also have memory! Why shape memory have “memory”?

 

First understand the memory principle and memory characteristics of shape memory alloys

The metal that has been processed into a certain shape at high temperature is rapidly cooled down, plastically deformed into another shape in the low-temperature phase state, and then heated to the high-temperature phase, that is, the temperature that can become a stable state, and the phenomenon of recovering to the shape before low-temperature plastic deformation through martensitic reverse phase transformation is called Shape Memory Effect. Metals with this effect are usually alloys composed of two or more metal elements, so they are called shape memory alloys. The shape memory effect is caused by martensitic phase transformation. The high-temperature phase and low-temperature phase involved in the martensitic phase transformation are called the parent phase and martensitic phase respectively. The driving force for shape recovery is the difference in free energy between the parent phase and the martensitic phase at the heating temperature.

 

Compared with other alloys, Shape Memory Alloys have excellent shape memory effect, excellent superelasticity, good damping properties, wear resistance and corrosion resistance. The elasticity of ordinary metal materials generally does not exceed 0.15%, while that of shape memory alloys is 20% or higher, so Shape Memory Alloys are also called superelastic alloys.

 

Powder parameters of nano nickel-titanium alloys produced by Hongwu Nano

Nano Nickel-Titanium Shape Memory Alloy, Nickel Titanium Alloy Nano Powders, particle size 70nm, ratio Ni:Ti=5:5, black solid powder, spherical morphology.

 

Characteristics of nano nickel-titanium alloys

As a new functional material integrating perception and drive, nano Nickel-Titanium Shape Memory Alloy is an important member of the intelligent material structure and has important theoretical and applied research value. Titanium-Nickel Shape Memory Alloy is a functional material with high strength, corrosion resistance, good biocompatibility, non-toxicity and medical application prospects. After deformation in the low-temperature phase, it only needs a slight temperature of 20 ~300℃ to restore the shape memorized by the parent phase. Its expansion rate is above 20%, fatigue life is up to 107 times, and damping characteristics are 10 times higher than ordinary springs. It has properties that ordinary metals cannot imagine. Data show that among the existing memory alloys, only Ni-Ti alloy can meet the requirements of chemical and biological reliability at the same time, and it is the only memory alloy currently used in medicine.

 

Application of nano Nickel-Titanium alloy

Because of its unique shape memory effect, biocompatibility, superelasticity and excellent wear resistance, it has been widely used in clinical and medical equipment, and has been widely used in stomatology, orthopedics, orthopedics, ENT, human body pipelines, minimally invasive interventional devices, artificial organs and tissues, coagulation filters, artificial hearts, correction wires, spinal orthopedic rods, patellar concentrators, etc.

 

As one of the key basic materials for intelligent materials, Shape Memory Alloy materials can be called ideal materials across the 21st century. Because it has special properties such as automatic action function and superelasticity, energy saving, and thermal sensitivity, it has not only attracted widespread attention from the industry, but now many domestic units and colleges and universities have applied nano nickel-titanium memory alloys to relevant fields and have achieved certain application results. China has been at the forefront of the world on Ni-Ti alloy in many aspects of medical applications.