"Click New Materials" Materials Around Us PPT Courseware 3

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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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For more information about the PPT courseware "Substances Around Us Click New Materials", please click the Substances Around Us ppt Click New Materials ppt tag.

"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...

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Update Time: 2024-10-03

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume one industry PPT template

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