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"Click New Materials" Materials Around Us PPT Courseware 3
1. Nanomaterials
Nano is a unit of length
1nm=10-9m
Nanomaterial scale: 1~100 nanometers
1. Features
When the particles of a material are as small as nanometers, the properties of the material change significantly.
2. Application
Industry, agriculture, energy, environmental protection, medical care, national security, etc.
2. Semiconductor materials
Semiconductor lighting decorative ceiling
Semiconductor lighting is a new generation of electric light source after incandescent lamps and fluorescent lamps. It is extremely safe and poses no danger of physical contact. It can also be cleaned with water. It is very energy-saving. Since there are no ultraviolet and infrared rays in the spectrum, there is no high It is a new type of green lighting source that uses heat and has a long service life.
Semiconductor traffic lights
The street lamp adopts a separate design of LED and power module for easy maintenance and repair in the future. Optimized heat dissipation management technology effectively minimizes the light decay of lamps. The lamp has dustproof and waterproof protection level IP66.
3. Superconducting materials
1. Features
When the temperature drops to a certain level, the resistance of the material becomes zero, which is called a superconductor.
2. Application of superconducting materials:
(1) Utilizing the zero-resistance characteristics of superconductors to achieve long-distance high-power transmission can transport high currents without loss.
(2) There are many types of superconducting materials and they are widely used. like:
4. Hidden materials
1. Features
It can absorb most of the electromagnetic waves emitted by radar and reflect very little back.
2. Application
On important military targets or weapons such as aircraft and tanks
practice
1. In order to save energy, many gymnasiums use diode lighting. The main material of diodes ( )
A. Nanomaterials B. Insulators
C. Conductor D. Semiconductor
2. Which of the following examples is correct ( )
A. Any substance is a superconducting material
B. Superconductor is an ideal conductor, but it cannot be manufactured.
C. Only mercury is a superconductor
D. Superconducting material is a material with zero resistance at very low temperatures.
3. Invisible material refers to ( )
A. Invisible materials
B.Inaudible material
C. Materials that cannot be felt
D. Materials that cannot be detected by radar
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"Click New Materials" Materials Around Us PPT Courseware 2:
"Click New Materials" Materials Around Us PPT Courseware 2 Teaching Objectives 1. Preliminarily understand some characteristics and applications of nanomaterials, semiconductor materials, superconducting materials, and invisible materials. 2. Experience the process of collecting information such as surfing the Internet, going to the library, conducting social surveys, etc.
"Click New Materials" Materials around us PPT courseware:
"Click New Materials" Materials Around Us PPT Courseware Learning Objectives 1. Understand some characteristics, applications and development prospects of nanomaterials, semiconductor materials, superconducting materials, invisible materials, etc. 2. Understand the impact of new materials on human life and social development The impact of core examination...