Beating call for the idols on stage, cheering for the partners on the field, many of them swinging brightlyFluorescent barI don't know. Fluorescent rods, why flash in the dark night
What's in the fluorescent rod? What's the reaction
The fluorescent stickShining principlesLike other sources of light, it is also a source of light that releases photons when individual atoms are activated. But unlike a light bulb, a light bulb uses heat to stimulate atoms, while a fluorescent rod glows insideChemical substancesIt happenedChemical reactionsAbout。
There are three main types of chemicals in fluorescent rods: peroxides, ester compounds and fluorescent dyes. It is the presence of these substances that provides the basis for fluorescent rods to glow. The fluorescent rod glows on the basis that peroxides and ester compounds react chemically, and the energy released in this reaction is passed to fluorescent. In light dye molecules, the fluorescent rod that we see is the fluorescent dye that releases energy in visible light (from high energy to more stable low energy), where chemistry can be converted to light。
Fluorescent rods are a rod containing two liquid compounds, ester compounds - phenyllicate and fluorescent dye - dye solution. Before it was activated, the two solutions were installed in two separate tubes. In the middle of them is a small glass bottle containing hydrogen peroxide solution known as the “activator”。
How do you activate the fluorescent rod to make it glow
We bend it all the time, and the fluorescent rod lights up. What's the principle? The outermost layer of the fluorescent rod is a plastic tube with peroxide in the glass tube. When the fluorescent rod bends, the glass pipe inside is broken, the two solutions are mixed, the chemical material meets and the energy released during the chemical reaction is transmitted to the fluorescent dye, and the fluorescent rod begins to glow. The whole reaction process of lighting is as follows:
Hydrogen peroxide oxidizes phenylpropylate to form a compound called phenol and unstable peroxyate。
2 peroxylate decomposition, resulting in more phenols and cyclic peroxide compounds。
3. Ring peroxioxin compounds are dissolved to form carbon dioxide。
4. Decomposition releases energy to dye。
5. The electron leap in dye atoms to higher energy levels and then back to where they were, releasing energy in light. In addition, the fluorescent rods that we see are very colourful, and these different colours of light, because the fluorescent dyes are different, so we can see that they are colorful。
Depending on the compounds used in the fluorescent rods, the chemical luminescences vary in duration, ranging from minutes to hours. If its solution is heated, the fluorescent rod will give rise to greater light, but for a short period of time. If you want the fluorescent rod to darken, you just have to cool it。
Is fluorescent rods harmful to humans
The fluorescent rods are mainly plastic packaging, and the chemical liquids in the fluorescent rods are surrounded by plastic, do not come into direct contact with the human body and therefore do not cause harm to the human body. And the light from the fluorescent rod is not the light from the dyes that is triggered by radiation, but the non-radiation light from the dyes that is triggered by chemical reactions and does not harm the human body。
But today, some people are trying to catch up with fashion by breaking their fluorescent rods and coating liquids on the skin surface, which can cause some damage to the human body, which could be even greater in the case of more vulnerable children. So it's safer to have it all in your hand。
This is a scientific clearance conducted by teachers at the secondary level of the pilot school attached to the haiti school for the further training of teachers in beijing city。
(cop china-scientific principles are well understood)
