In order to let users understand the company's formaldehyde odor control products intuitively: formaldehyde odor decomposition catalyst, do a tindal phenomenon experiment.
Dindal phenomenon experiment:
Materials: 1 laser pen, 1 cup of transparent water, 1 cup of company products
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!
1、 What is the Dahl phenomenon?
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年首先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。 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.  Dingdal effect is a common physical method to distinguish colloid from solution.
2、 Why is there a light column in the cup with catalyst?
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.
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.
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.
3、 What is the solid in the cup?
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.
4、 What is the use of small particle solids in cups?
Catalytic decomposition of formaldehyde into water and carbon dioxide.
5、 Why does small particle solid decompose formaldehyde?
A: small solid particles are between positive and negative charges.
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.
1. The electron of oxidant is reduced
2. The reductant loses electrons and is oxidized
3. Formaldehyde is a reducing agent, which is oxidized to carbohydrates when electrons are lost.
4. Electrons are negatively charged subatomic particles.
5. The same charge repels each other and the different charges attract each other
Oxidation and reduction are the same process.