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Some common applications of nano cerium oxide materials

Nano ceria/cerium dioxide/CeO2/ceric oxide/Cerium(IV) oxide, is an inorganic compound that exists in the form of fine particles with dimensions typically ranging from 1 to 100nm. Cerium oxide nano material exhibits unique physical, chemical, and optical properties due to its nanoscale size, which differ significantly from those of bulk CeO2.

Some common applications of nano cerium oxide materials:
1.‌Fuel Cell Electrolyte‌: Nano ceria is utilized in fuel cells as an electrolyte, enhancing the efficiency and performance of these energy conversion devices.

2.UV Absorbent‌: Its ability to absorb UV radiation makes ceric oxide nanopowder an effective additive in sunscreens, cosmetics, and plastics to protect against UV damage.

3.‌Electronic Ceramics‌: Cerium oxide nano material used in the production of electronic ceramics used in various electronic devices to improve the density and smoothness of ceramic materials.

4. Polishing Material‌: In the manufacturing industry, cerium dioxide nano material serves as a high-performance polishing agent for optical components, semiconductors, and other precision surfaces, providing superior smoothness and finish.

5. Catalyst and Catalyst Carrier: Nano CeO2 is widely used as a catalyst or catalyst support in various chemical reactions due to its high surface area and excellent catalytic activity. It enhances the efficiency of processes like automotive exhaust treatment, where it helps in converting harmful pollutants into harmless compounds. In the field of environmental remediation, nano ceria can be used to remove pollutants from water and air, contributing to a cleaner and safer environment.

These applications highlight the versatility and importance of cerium dioxide nano material in various technological and industrial advancements.

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Silicon carbide-graphene composite structure heat dissipation material

With the increase in power density of semiconductor devices, “heat dissipation” has become the primary problem that hinders the performance and life of electronic devices. According to statistics, for every 10℃-15℃ increase in the temperature of electronic devices, their corresponding service life will be reduced by 50%. Therefore, it is particularly important to develop high-performance thermal interface materials for high-power density thermal management.

Recently, the functional carbon material team of the surface division of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, and its collaborators prepared a high-performance thermal interface material based on graphene paper. The preparation process of this material is as follows: first, nano-silicon dioxide particles (SiO2 NPs) are modified on the surface of graphene oxide (GO) by hydrolysis of tetraethyl orthosilicate (TEOS) in a weak alkaline environment; then, the obtained GO/SiO2 NPs are mixed with graphene powder, and a composite graphene film is prepared by filtration to achieve uniform distribution of nanoscale silicon source (SiO2 NPs) between graphene layers; finally, the composite graphene film is subjected to rapid heat treatment to in-situ convert the silicon source into silicon carbide nanowires to obtain graphene hybrid paper (GHP) with a silicon carbide-graphene composite structure.

Because the silicon carbide nanowires connected between graphene layers form a longitudinal heat conduction path, the longitudinal thermal conductivity of GHP (10.9W/mK) is 60% higher than that of graphene paper (GP, 6.8W/mK). In addition, under a compressive stress of 75psi, the longitudinal thermal conductivity of GHP in the compressed state is further increased to 17.6W/mK, which is higher than traditional graphene paper and most commercial thermal interface materials, including thermal conductive silicone pads, thermal conductive silicone grease and thermal conductive gel.

In the actual thermal interface performance evaluation experiment, the temperature drop of the system with GHP as the thermal interface material is as high as 18.3℃, which is more than twice the temperature drop of commercial thermal interface materials (8.9℃), and the heat dissipation efficiency is improved by 27.3%. The simulation software simulates the heat dissipation process, and the results show that GHP not only has a higher longitudinal thermal conductivity, but also has a lower contact thermal resistance than the mainstream commercial thermal pad. In addition, compared with silicone-based commercial thermal interface materials, GHP is completely composed of inorganic silicon carbide and graphene, and has better thermal stability and environmental adaptability. The relevant work has been published in ACS Nano (2019, DOI: 10.1021/acsnano.8b07337).

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Silicon Carbide Nanowires

The diameter of silicon carbide nanowires is generally less than 500nm, and the length can reach hundreds of μm, which has a higher aspect ratio than silicon carbide whiskers. Silicon carbide nanowires inherit the various mechanical properties of silicon carbide bulk materials and also have many properties unique to low-dimensional materials. Theoretically, the Young’s modulus of a single SiCNWs is about 610~660GPa; the bending strength can reach 53.4GPa, which is about twice that of SiC whiskers; the tensile strength exceeds 14GPa. In addition, since SiC itself is an indirect bandgap semiconductor material, the electron mobility is high. Moreover, due to its nano scale size, SiC nanowires have a small size effect and can be used as a luminescent material; at the same time, SiC-NWs also show quantum effects and can be used as a semiconductor catalytic material. Nano silicon carbide wires have application potential in the fields of field emission, reinforcement and toughening materials, supercapacitors, and electromagnetic wave absorption devices.

In the field of field emission, because nano SiC wires have excellent thermal conductivity, a band gap width greater than 2.3 eV, and excellent field emission performance, they can be used in integrated circuit chips, vacuum microelectronic devices, etc.

Silicon carbide nanowires have been used as catalyst materials. With the deepening of research, they are gradually being used in photochemical catalysis. There are experiments using silicon carbide nanowires to conduct catalytic rate experiments on acetaldehyde, and compare the time of acetaldehyde decomposition using ultraviolet rays. It proves that silicon carbide nanowires have good photocatalytic properties.

Since the surface of SiC nanowires can form a large area of double-layer structure, it has excellent electrochemical energy storage performance and has been used in supercapacitors.

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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.

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Application and Advantages of Nano ATO in Battery

Conductivity, transparency, stability and preparation make the nano ATO (Antimony Doped Tin Oxide) an important material in the battery field. ATO has a wide range of applications and significant advantages for battery.

Firstly, nano ATO can provide excellent conductive performance. In the battery application, the selection of conductive materials is very important to the current transmission and electrode reaction rate. The nano ATO is high -conductive and can effectively transmit the charge to the battery. Its low resistance characteristics and high electronic migration rates help improve the battery’s conductivity and discharge efficiency. This makes ATO widely used in various battery systems such as lithium -ion batteries, solar cells and fuel cells.

Secondly, nano ATO has good transparency. In some applications, such as transparent electronic devices and photovoltaic applications, the transparency of materials is crucial. The nano ATO has a high radiation rate, which makes it play an important role in transparent electrodes. It can be used for the transparent conductive layer and equipment such as transparent solar cells, touch screens, and LCD display. The high transparency of nano ATO enables light to better penetrate and maintain the transparency and visibility of the equipment.

Thirdly, nano ATO also shows good chemical and thermal stability, enabling it to work stably for a long time in the battery environment. It can tolerate high temperature, high humidity and chemical corrosion conditions, and maintain the electrical and transparency of the material. This makes ATO apply to various battery systems, including high -temperature batteries, humidity sensitive batteries and corrosion -resistant batteries.

In addition, nano ATO also has the advantage of good preparation. It can prepare film, powder and other forms through simple solutions, heat treatment, and film deposition, which is convenient for integration and application in the battery manufacturing process. The flexibility and controllability of this preparation make ATO a regulatable material in the battery, which can meet the needs of different battery applications.

In short, as a conductive transparent material, nano ATO has many application advantages in the battery field. Its excellent conductive performance, high transparency, chemical stability and preparation make it an important material in various battery systems. Its applications are expected to promote the further development of battery technology, bringing unlimited possibilities for renewable energy and portable electronic equipment.

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MgO Temperature Sensor: Principle, Application, and Development Prospects

In modern technology applications, temperature sensor plays the role in various fields. This article will introduce the importance of a common and important temperature sensor – magnesium oxide temperature sensor. We will discuss its work principles, application and prospect.

Working principle

Magnesium oxide temperature sensor is based on the thermoconductive properties of magnesium oxide. When the temperature changes, the conductivity of magnesium oxide will also change. The sensor contains a thin magnesium oxide resistance wire. When the temperature rises, the resistance value of the magnesium oxide resistance wire decreases; and when the temperature decreases, the resistance value increases. With this characteristic, the temperature change can be measured indirectly by measuring the resistance change of the magnesium oxide resistance wire.

Application

Industrial automation: MgO temperature sensor iswidely used in industrial automation to monitor and control the temperature of various industrial processes. For example, in industries such as chemical industry, electric power, and steel, temperature sensors can be used to monitor temperature changes in reactors, boilers, furnaces, and pipelines to ensure safe operation and improve production efficiency.
Environmental monitoring: Magnesium oxide temperature sensor can also be used in the field of environmental monitoring. For example, in atmospheric science research, measuring temperature changes in the atmosphere is critical to understanding climate change and weather forecasting. Magnesium oxide temperature sensor can be used in conjunction with other sensors to provide accurate weather data.
Medical applications: Temperature sensors also play an important rolein medical equipment. Magnesium oxide temperature sensor can be used to monitor body temperature and iswidely used in thermometers, medical imaging equipment, and laboratory instruments.

Development Prospect

The application of magnesium oxide temperature sensor in modern technology is constantly expanding and has shown development prospects in the following areas:

Application in high temperature environment: Magnesium oxide temperature sensor has good high temperature stability and corrosion resistance, which enables it to work stably in high temperature environment. With the increasing demand for high temperature monitoring in the industrial field, the application of magnesium oxide temperature sensors in high temperature conditions will be further expanded.
Accuracy and sensitivity improvement: With the continuous improvement of the process and the development of technology, the accuracy and sensitivity of the magnesium oxide temperature sensor will be further improved. This will make it more useful in more sophisticated applications, such as aerospace and scientific research.
Diversified packaging and integration: Integrating the magnesium oxide temperature sensor with other sensors and chips can realize multi-functional monitoring and intelligent control. Combining it with wireless communication technology can realize wireless monitoring and remote data transmission, further expanding the application field and convenience.

Magnesium oxide temperature sensor, as an important temperature measurement tool, has a wide range of application fields and development prospects. With the continuous advancement of science and technology, magnesium oxide temperature sensor will continue to develop in high-temperature environments, accuracy and sensitivity improvements, and diversified packaging and integration, providing more accurate, reliable and intelligent temperature monitoring solutions for all walks of life.

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About Stealth Materials and Related Nano Materials

Stealth materials, also known as absorbing materials, refer to a type of electromagnetic material that can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into heat energy, and consume it. They are widely used in military, aerospace, and security fields to reduce the detectability of targets in equipment such as electromagnetic wave detectors, radar systems, and infrared sensors.

 

The principle of stealth materials mainly includes two aspects:

 

Absorption: Stealth materials have the characteristic of highly absorbing electromagnetic waves, which can absorb most or specific wavelengths of light within the spectral range, thereby reducing reflection and scattering. This absorption characteristic can be achieved through appropriate material selection and design, such as using composite materials with absorbing agents or absorbing coatings.

 

Scattering: Stealth materials can change the propagation path of electromagnetic waves by causing them to scatter or refract in different directions, thereby reducing the echo signal of the target. This principle can be achieved through the design of nanostructures, microstructures, or multi-layer materials to alter the interaction between electromagnetic waves and materials.

 

The common nano powder used for stealth applications include iron oxide, nano silver, and so on. They have excellent absorption and scattering characteristics, effectively weaken or shield the reflection and echo signals of electromagnetic waves, and improve the stealth performance of targets. The following are some common applications of nano powders in stealth technology:

 

  1. Iron oxide nano powder: Iron oxide nano powder has excellent wave absorption performance, can absorb and scatter electromagnetic waves, and achieve stealth effect within a certain range.

 

  1. Carbon nanotubes: Carbon nanotubes have high conductivity and good absorption properties, which can absorb and dissipate electromagnetic waves over a wide frequency range. They are used to prepare composite materials with good stealth properties.

 

  1. Graphene: As a two-dimensional material with a single layer of carbon atoms, graphene has excellent electron transfer and absorption properties and can be used to prepare efficient invisible coatings or composite materials.

 

  1. Silver nanoparticles: Silver nanoparticles exhibit excellent absorption performance in the visible light range, capable of absorbing, scattering, or reflecting electromagnetic waves, achieving stealth effects.

 

The above-mentioned nano raw materials are all supplied by Hongwu Nano. Welcome to contact us for further information if you are interested in.