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How much do you know about all kinds of glass in your life?

Fanyu 2018-08-07 11:33:01
In addition to tempered glass, there are many special glass materials that play an important role in our lives.

With the development of the modern information society, people's lives are inseparable from the optical fiber that transmits signals. At present, the optical fiber used is generally quartz glass fiber. The main method for producing the glass material is to melt high-purity quartz glass into a molten body in a high-temperature furnace, and then to extrude the melt into a hollow having a diameter of about 100 μm. The elongated filaments give the optical fibers. When light is incident on the glass fibers at a suitable angle, the light travels along the curved glass fibers, so it is called an optical fiber. In 1966, British-Chinese scientist Gao Wei theoretically proved the feasibility of using optical fiber as a medium to realize optical propagation signals. Today, optical fiber has become a widely used communication material.

Light-related glass also has photochromic glass. The photochromic glass changes from a colorless and transparent state to a dark color under sunlight or strong light; the discolored glass is placed in a dark place and becomes a colorless and transparent state again. The secret of its color change is the addition of silver bromide (or silver chloride) and traces of copper oxide to the glass. Silver bromide decomposes under strong light to produce silver atoms and bromine atoms (or chlorine atoms), while silver atoms can absorb visible light. When the silver atoms are produced to a certain amount, they are irradiated.glassMost of the visible light is not absorbed, and the glass is grayish black; the blackened glass is placed in the dark, and the silver atom and the bromine atom (or chlorine atom) combine to form bromine under the catalytic action of copper oxide. Silver (or silver chloride), the glass becomes colorless and transparent again. Photochromic glass is often used as a lens for color-changing glasses, and it can also be used to make windows that soften the sunlight entering the room during the summer. In recent years, there has also been a new type of color-changing glass, electrochromic glass, which can be stably and reversibly discolored under the action of an electric field. This glass can change color under human control. There are already glass curtain walls made of electrochromic glass in buildings.

There is also a glass that is essential in our lives, that is, borosilicate glass. Speaking of the name of this glass, you may not be familiar with it, but the utensils made with it are what we use every day, that is, the glass of water that people drink. Compared with ordinary glass, borosilicate glass has the advantages of high temperature resistance, low expansion ratio, high strength and high hardness. Therefore, a water cup made of borosilicate glass is not easily broken in the case of rapid cooling and rapid heating. Moreover, the main material for making the glass pot is also borosilicate glass.