In order to let users understand the company's formaldehyde odor control products intuitively: formaldehyde odor decomposition catalyst, do a tindal phenomenon experiment.

丁达尔现象实验：

Dindal phenomenon experiment:

材料：1支激光笔；1杯透明水；1杯公司产品

Materials: 1 laser pen, 1 cup of transparent water, 1 cup of company products

方法：用激光笔分别垂直照射两只装有不同液体的杯子，其中装有甲醛异味分解催化剂的杯子会出现一个光柱！

Methods: irradiate two cups with different liquid vertically with laser pen, and a light column will appear in the cup with formaldehyde odor decomposition catalyst!

一、什么是达尔现象？

1、 What is the Dahl phenomenon?

答：当一束光线透过胶体，从垂直入射光方向可以观察到胶体里出现的一条光亮的“通路”，这种现象叫丁达尔现象，也叫丁达尔效应（Tyndall effect）；

A: when a beam of light passes through the colloid, a bright "path" can be observed in the colloid from the direction perpendicular to the incident light. This phenomenon is called Tyndall effect;

英国物理学家约翰·丁达尔(John Tyndall 1820～1893年) ，1869年发现和研究了胶体中的上述现象。这条光亮的“通路”是由于胶体粒子对光线散射形成的。 [2]丁达尔效应是区分胶体和溶液的一种常用物理方法。

John Tyndall (1820-1893), a British physicist, first discovered and studied the above phenomena in colloids in 1869. This bright "path" is due to the scattering of light by colloidal particles. [2] Dingdal effect is a common physical method to distinguish colloid from solution.

二、为什么装有催化剂的杯子中有光柱？

2、 Why is there a light column in the cup with catalyst?

答：因为溶液中有固体的小颗粒。小颗粒对光产生散射，才能看见光柱。这些说明咱们试剂中有一种物质。

A: because there are small solid particles in the solution. Small particles scatter light to see the light column. These indicate that there is a substance in our reagent.

产生原因：

Causes:

在光的传播过程中，光线照射到粒子时，如果粒子大于入射光波长很多倍，则发生光的反射；如果粒子小于入射光波长，则发生光的散射，这时观察到的是光波环绕微粒而向其四周放射的光，称为散射光或乳光。丁达尔效应就是光的散射现象或称乳光现象。由于真溶液粒子半径一般不超过1 nm，胶体粒子介于溶液中溶质粒子和浊液粒子之间，其半径在1~100 nm。小于可见光波长（400 nm～700 nm），因此，当可见光透过胶体时会产生明显的散射作用。而对于真溶液，虽然分子或离子更小，但因散射光的强度随散射粒子体积的减小而明显减弱，因此，真溶液对光的散射作用很微弱。此外，散射光的强度还随分散体系中粒子浓度增大而增强。

In the process of light propagation, when the light hits the particles, if the particles are many times larger than the wavelength of the incident light, light reflection will occur; if the particles are smaller than the wavelength of the incident light, light scattering will occur. At this time, the light that the light waves radiate around the particles is observed, which is called scattered light or milk light. Tindal effect is the scattering phenomenon of light or milk light phenomenon. As the radius of the particles in the real solution is generally less than 1 nm, the colloidal particles are between the solute particles and the cloud particles in the solution, and the radius is 1-100 nm. It is smaller than the wavelength of visible light (400 nm ~ 700 nm). Therefore, when visible light passes through colloid, it will produce obvious scattering effect. For the real solution, although the molecule or ion is smaller, the intensity of the scattering light is obviously weakened with the decrease of the volume of the scattering particles, so the scattering effect of the real solution on the light is very weak. In addition, the intensity of scattering light also increases with the increase of particle concentration in the dispersion system.

光柱越亮，说明溶液中含小颗粒固体越多，浓度越高，治理效果越好。

The brighter the light column is, the more solid particles are contained in the solution, the higher the concentration is, and the better the treatment effect is.

三、杯子中的固体是什么？

3、 What is the solid in the cup?

答：是用食品添加剂做成类似石头粉末状的物质，可以溶解在水中。因此也是无害的。从而说明公司产品无害，无二次污染。

A: it is made of food additives like stone powder, which can be dissolved in water. Therefore, it is non-toxic and harmless. So that the company's products are non-toxic and harmless, no secondary pollution.

四、杯子中小颗粒固体的用途？

4、 What is the use of small particle solids in cups?

催化分解甲醛成为水和二氧化碳。

Catalytic decomposition of formaldehyde into water and carbon dioxide.

五、小颗粒固体为什么会分解甲醛？

5、 Why does small particle solid decompose formaldehyde?

答：小颗粒固体在正负电荷之间。

A: small solid particles are between positive and negative charges.

特点：光照后，固体颗粒一端带正电，一端带负电。带正电那端氧化分解甲醛，把甲醛分解成水和二氧化碳。

Features: after illumination, one end of solid particles is positively charged and the other is negatively charged. The positive end oxidizes and decomposes formaldehyde into water and carbon dioxide.

备注：

Remarks:

1. 氧化剂得电子被还原

1. The electron of oxidant is reduced

2. 还原剂失电子被氧化

2. The reductant loses electrons and is oxidized

3. 甲醛是一种还原剂，失去电子时被氧化成碳水化合物。

3. Formaldehyde is a reducing agent, which is oxidized to carbohydrates when electrons are lost.

4. 电子，是带负电的亚原子粒子，带负电。

4. Electrons are negatively charged subatomic particles.

5. 同种电荷相互排斥，异种电荷相互吸引

5. The same charge repels each other and the different charges attract each other

氧化、还原二者是同一个过程。

Oxidation and reduction are the same process.