Glass has excellent transparency and can transmit natural light or artificial light sources. It is widely used in building windows, car windows and optical equipment.
Transmittance:Generally, the light transmittance of ordinary glass can reach more than 85%.
Adjust the light:After processing, it can be made into glass with different light transmittances, such as fogged glass or stained glass.
Hardness and durability
Glass is hard and resistant to scratches, but its brittleness makes it brittle. After strengthening treatment, impact resistance and safety can be improved.
Mohs hardness:Ordinary glass is about 5-6.
Corrosion resistance:Good resistance to acids and bases, except hydrofluoric acid.
Thermal stability
Glass can withstand temperature differences within a certain range, but rapid rise and fall in temperature may cause cracking. Special glass such as heat-resistant glass (such as borosilicate glass) can withstand extreme temperature environments.
High temperature resistance:Pyrex glass can withstand temperatures up to over 500°C.
Thermal expansion coefficient:The thermal expansion coefficient of ordinary glass is (8-10)×10-6/°C。
Sound insulation and thermal insulation properties
Glass can be processed to improve sound insulation and thermal insulation properties, such as insulated glass or laminated glass.
Insulated glass:Reduce heat conduction and noise transmission, suitable for high-energy-efficiency buildings.
Laminated glass:The inner glue layer can effectively block sound waves.
Optical properties
Glass can obtain special optical properties by adjusting its composition and processing methods, such as UV-resistant glass and low-emissivity glass.
UV protection:It can filter more than 99% of ultraviolet rays and protect indoor items.
Low-emissivity (Low-E) glass:Effectively reduce heat radiation transfer and improve building energy efficiency.
Processing diversity
Glass can be processed in a variety of ways according to needs to meet applications in different scenarios.
Tempered treatment:Improve impact resistance and safety.
Dyeing and coating:Achieve a combination of decoration and functionality, such as thermal insulation or anti-glare.
Engraving and cutting:Used for artistic design and personalized decoration.
functional materials
definition
Functional materials refer to materials that have specific physical, chemical or biological functions, can produce specific responses to external stimuli (such as light, heat, electricity, magnetism, pressure), and are used in sensing, energy conversion, energy storage, biomedicine, electronics and other fields.
Classification
Optoelectronic materials: Can absorb, emit or convert light energy, such as solar cell materials and LED fluorescent materials.
Piezoelectric materials: Generates electrical energy under mechanical pressure, or deforms after being energized, such as piezoelectric ceramics.
Thermoelectric materials: Temperature difference can be converted into electrical energy and used for power generation and temperature control.
shape memory alloy: Can be restored to its original shape after heating, such as NiTi alloy.
superconducting materials: It exhibits zero resistance characteristics at low temperature, such as YBCO ceramics.
Magnetic functional materials: Has special response to magnetic fields, such as magnetoresistive materials and magnetostrictive materials.
biofunctional materials: Compatible with living organisms and equipped with specific functions, such as drug-releasing materials and biosensors.
Application areas
Energy technology: solar panels, thermoelectric modules, lithium battery electrode materials
Transportation: shock-absorbing and shock-absorbing materials, shape memory alloy drivers
Features and Advantages
Active functionality rather than mere structural support
Multiple functions can be designed into one (such as photocatalysis + antibacterial)
Ability to interact physically or chemically with the outside world
Play a key role in emerging technologies such as smart wearables and bioelectronics
Representative materials and functions
Material
Function
application
Lead zirconium titanate (PZT)
Piezoelectric
Ultrasonic probes and sensors
Bismuth telluride (Bi₂Te₃)
Thermoelectric
Thermoelectric power generation
NdFeB
Strong magnetism
Motors, generators
zinc oxide nanowires
Photoelectric, piezoelectric
Nanogenerator, UV sensor
NiTi alloy
shape memory
Brackets, microactuators
Polymer materials
definition
Polymer materials are polymers composed of a large number of monomers connected by covalent bonds. They have high molecular weight and a variety of mechanical and chemical properties. They are widely used in industry, medical care, construction and daily life.
Classification
Classified by source：
Natural polymers: such as cellulose, natural rubber, and protein.
Synthetic polymers: such as polyethylene, polystyrene, and nylon.
Classification by nature：
Thermoplastics: can be softened and reshaped by heating, such as PVC and PE.
Thermosetting plastics: cannot be thermoplastic after curing, such as phenolic resin.
Elastomer: with high elastic deformation ability, such as synthetic rubber.
Structure and properties
Mainly chain structure, which may be linear, branched or cross-linked.
It has good formability, electrical insulation, corrosion resistance and light specific gravity.
Strength, heat resistance, flame retardancy, etc. can be improved through additives.
Aerospace and automotive: lightweight structural components, composite materials
Nanomaterials
Nanomaterials refer to materials with special physical and chemical properties at the nanometer scale (1 to 100 nanometers). Due to their unique size, nanomaterials exhibit properties different from traditional materials, such as higher strength, conductivity, catalytic activity and optical properties, and therefore have broad application prospects in various fields.
Classification of nanomaterials
nanoparticles: Including metal nanoparticles (such as gold, silver), semiconductor nanoparticles (such as quantum dots) and magnetic nanoparticles, etc.
Nanofilm: The film thickness is at the nanometer level and is commonly used in electronic components and surface coatings.
Nanowires and Nanotubes: For example, carbon nanotubes and nanowires are used in energy and electronic equipment due to their high strength and conductivity.
Nanocomposites: It is composed of a mixture of different nanomaterials and has the characteristics of various materials. It is widely used in biomedicine and environmentally friendly materials.
Applications of Nanomaterials
The special properties of nanomaterials enable them to be widely used in various fields. For example:
electronic technology: Using nanomaterials to create smaller, faster electronic components.
medicine: Nanomaterials can be used for drug delivery, cancer treatment and bioimaging to improve medical technology.
energy: Application of nanomaterials in solar cells, fuel cells and lithium batteries to improve energy efficiency.
environmental protection: Nanomaterials are used for water treatment, air purification and harmful substance removal to improve environmental quality.
self-healing materials
The main mechanism of self-healing materials
microencapsulation technology: The repairing agent is encapsulated in microcapsules. When the material is damaged, the microcapsules burst and release the repairing agent to repair themselves.
dynamic bonding technology: Use chemical bonds that can be formed and broken dynamically (such as hydrogen bonds or covalent bonds), and when damaged, these bonds will reconnect to complete the repair.
polymer network technology: These materials contain special polymer networks that allow the molecules in the material to move and rearrange when damage occurs, filling in the damaged areas.
shape memory material: A material with shape memory that, when damaged or deformed, can return to its original shape under specific temperatures or conditions.
Application of self-healing materials
electronic device: Cases for wearable devices, cell phones and other electronics to reduce daily wear and tear.
buildings and infrastructure: Self-healing cement and concrete can fill cracks on their own, extending the life of the building and reducing maintenance costs.
aerospace and automotive: Used in spacecraft and car body materials, self-healing technology can improve safety and durability.
medical equipment: Self-healing polymers are used in biomedical devices and implants to extend device life and reduce the need for surgical replacement.
Advantages and challenges of self-healing materials
Advantages: Extend material life, reduce maintenance costs, save resources, and reduce waste.
challenge: At present, the production cost of self-healing materials is high, and the repair efficiency and performance stability need to be further improved, especially in applications in extreme environments.
future development
With advances in nanotechnology, materials science and chemistry, self-healing materials will further improve repair efficiency, durability and application range. It may become one of the important technologies for sustainable development in the future and be widely used in various fields.
graphene
Properties of graphene
High conductivity: Graphene has extremely high electron mobility, which is superior to silicon, making it an ideal semiconductor material.
Excellent thermal conductivity: The thermal conductivity of graphene exceeds that of ordinary metals, making it very suitable for use as a heat dissipation material.
High strength and flexibility: Graphene is 100 times stronger than steel and has excellent flexibility.
Thin and translucent: The thickness is only one atomic layer, and the optical transmittance reaches over 97%.
Applications of graphene
Electronics and Semiconductors: Graphene can be used to create ultra-fast transistors and circuits, improving the efficiency of electronic devices.
energy storage: Graphene enhances energy storage and charge and discharge speeds in batteries and supercapacitors.
medical field: Used in biosensors and medical diagnostic equipment to improve accuracy.
new materials: Graphene enhances the strength and durability of composite materials and is used in aerospace and other fields.
Graphene Challenge
Although graphene has great potential, production costs are high and large-scale preparation technology is still under development. The environmental impact and biocompatibility of graphene also require further study.
in conclusion
Graphene is regarded as an important candidate for future materials. As technology advances, it will bring revolutionary changes in various fields.
super hydrophobic material
What are superhydrophobic materials?
A superhydrophobic material is a material whose surface is extremely hydrophobic (i.e., repels water). The contact angle of water droplets on its surface usually exceeds 150°, which means that water droplets will form a bead shape on the surface of the material without spreading, thereby achieving self-cleaning and waterproof effects.
Characteristics of superhydrophobic materials
Self-cleaning: When water drops slide off, they will take away surface dirt and keep the surface clean.
Waterproof: Extremely high hydrophobicity prevents water from penetrating or adhering to the surface of the material.
Anti-corrosion: Can effectively resist the corrosive effects of moisture and chemical substances.
Ice resistance: It is not easy to accumulate water in low-temperature environments to avoid freezing and affecting material performance.
Applications of superhydrophobic materials
building materials: Used for windows, exterior walls, etc. to achieve self-cleaning and waterproof effects.
electronic equipment: Used to protect electronic components from water and increase the durability of equipment.
textile: Used in waterproof clothing and outdoor gear to increase comfort and functionality.
medical equipment: Prevent blood or other liquids from adhering and keep the instrument clean.
Challenges of superhydrophobic materials
Although superhydrophobic materials have broad application prospects, their durability, manufacturing cost, and environmental friendliness still need to be improved. Achieving long-term stable hydrophobic effect and large-scale production are current research focuses.
Photocatalyst
What is a photocatalyst?
PhotocatalystIt is a material that produces a catalytic reaction under light. The most common photocatalyst material is titanium dioxide (TiO₂). When the photocatalyst is exposed to ultraviolet or visible light, the surface will generate strong oxidizing power, which can effectively decompose organic matter, bacteria and viruses, achieving air purification, deodorization and antibacterial effects.
The principle of photocatalyst
When a photocatalyst is exposed to light (usually ultraviolet light), the electrons on its surface are excited and combine with moisture in the air to produce free radicals. These free radicals have strong oxidizing capabilities and can decompose pollutants in the air or kill bacteria.
Application of photocatalyst
Air purification:Photocatalysts can be used in air filters or coated on walls to decompose harmful substances in the air, such as formaldehyde and benzene.
Antibacterial and deodorizing:Photocatalyst coating can be applied to toilets, kitchens, trash cans and other areas to effectively suppress odors and sterilize.
Water treatment:Photocatalysts can be used in sewage treatment to remove organic pollutants in water and improve water quality.
Self-cleaning coating:Coating photocatalyst on building exterior walls can achieve a self-cleaning effect and reduce dirt accumulation.
Advantages and challenges of photocatalysts
The advantage of photocatalyst is that it is environmentally friendly and durable. It can achieve purification function without additional chemicals, and it only needs a light source to function continuously. However, since most photocatalysts require ultraviolet light to activate, when used indoors, it is usually necessary to cooperate with ultraviolet light or enhance their activity under visible light to improve the use effect.
aluminum honeycomb
Structure and properties
Aluminum honeycomb panels are composed of upper and lower aluminum alloy panels and an internal honeycomb structure. They are lightweight and high-strength.
High intensity:The honeycomb structure provides excellent compression and bending resistance.
Lightweight:Lighter than traditional solid materials, suitable for applications where weight reduction is required.
Corrosion resistance:The aluminum alloy material itself has good weather resistance and anti-rust properties.
Sound and heat insulation:The internal honeycomb structure effectively reduces noise and heat conduction.
Environmentally friendly and recyclable:100% aluminum is recyclable and meets the requirements of sustainable development.
Application areas
Architectural decoration:Exterior walls, ceilings, partition walls, etc., to improve the beauty and durability of buildings.
Aerospace:Aircraft interior structures, floors and bulkheads reduce weight and enhance structural strength.
Transportation:High-speed rail, subway, automobile interior and body panels to improve fuel efficiency and safety.
Furniture manufacturing:High-end office desks, display racks, door panels, etc., taking into account both beauty and practicality.
Installation method:Mechanical locks, adhesives or welding can be used to fix them, depending on the application requirements.
Daily cleaning:Use a neutral detergent and a soft cloth to wipe. Avoid using acidic or alkaline detergents.
Regular inspection:Check the fixing parts and edge seals to ensure stability and durability.
magnetic materials
Classification
Paramagnetic materials: It has a weak attraction to an external magnetic field, and its magnetic susceptibility is positive but very small, such as aluminum and magnesium.
Diamagnetic material: Produces repulsive force against an external magnetic field and has negative magnetic susceptibility, such as copper, gold, and graphite.
Ferromagnetic material: Can be strongly magnetized and maintain magnetism for a long time, such as iron, cobalt, and nickel.
Ferrimagnetic materials (Ferrimagnetic): The internal magnetic moments are not completely canceled and still have total magnetism, such as ferrite.
Antiferromagnetic materials (Antiferromagnetic): The magnetic moments of adjacent atoms are in opposite directions and cancel the total magnetism, such as manganese oxide.
Origin of magnetism
Magnetism comes from the spin and orbital motion of electrons. When most electrons spin in the same direction, the material exhibits macroscopic magnetism. Interatomic interactions and structural arrangements also affect magnetic behavior.
Hysteresis and magnetization curve
Ferromagnetic and ferrimagnetic materials often exhibit hysteresis, which means they retain some of their magnetism after the external magnetic field is removed. The hysteresis loop shows the process of magnetization and demagnetization of the material. The key parameters include residual magnetism (Remanence) and coercivity (Coercivity).
application
Core materials of motors and transformers (silicon steel, ferrite)
Storage media (hard disk, tape)
Permanent magnet materials (neodymium iron boron, alnico)
Sensing elements (Hall sensors, magnetoresistive elements)
Medical imaging (MRI uses superconducting magnets)
