Allochroic silica gel - Names and Identifiers
Allochroic silica gel - Physico-chemical Properties
| Molecular Formula | SiO2
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| Physical and Chemical Properties | Physical and chemical properties color-changing silica gel is a kind of drying moisture absorbent commonly used in laboratories, which can be used repeatedly after drying after moisture absorption. The commonly used color-changing silica gel is prepared by soaking silicic acid gel in CoCl2 solution and then drying and activating it. Because anhydrous CoCl2 is blue, hydrated CoCl2 · 6H2O is red. Therefore, according to the color change of color-changing silica gel, the degree of silica gel adsorption can be judged. |
| Use | Uses Silica gel is mainly used for gas drying or absorption, liquid dehydration and chromatographic analysis. It is also used as a catalyst or catalyst carrier. It is used as a sizing agent in the textile industry. Fine pore silica gel is mainly used for drying and purification of gas, dehydration and refining of organic products, and can also be used as a catalyst carrier. |
Allochroic silica gel - Introduction
Color changing silica gel is a silica gel containing a chemical indicator that changes Color in response to changes in humidity. Its properties are mainly determined by silica gel and chemical indicators.
The main use of Color changing silica gel is Humidity indicator. It is often used in packaging electronic products, medicines, food and other items to help detect whether the humidity inside the package meets the requirements. When the humidity is low, the silica gel appears blue or light yellow; When the humidity is high, it will become pink or dark yellow. This color change can remind people whether they need to take measures to protect items from moisture damage.
The method of preparing Color changing silica gel is to mix silica gel with an appropriate chemical indicator, and then react to generate Color changing silica gel particles by heating or other methods. Commonly used chemical indicators are cobalt chloride, Cadmium bromide, etc., their reaction with silica gel can lead to color changes.
Safety precautions are required when using and handling Color changing silica gel. First of all, Color changing silica gel is not edible and should be kept away from children and pets. Secondly, Color changing silica gel may release some chemicals, which may be harmful to human body under long-term exposure. Therefore, contact with eyes, skin and mouth should be avoided as much as possible. If you accidentally touch the skin, rinse immediately with water. At the same time, when handling Color changing silica gel, care should be taken not to mix it with food or medicine to prevent its contamination of items.
Last Update：2024-04-09 21:11:58