What is Silica Gel?



All the types of desiccants have the amorphous nature, silica gel is also not different. Always we can see the packets of silica it is mentioned as "Do not eat". As we know it is an inactive chemical, it will not work with any other substances. However, consuming silica gel is not good for our health.
Silica gel can easily enter the respiratory system of Humans because of its amorphous structure. It can make a lot of effects. It can lead to silicosis, bronchitis, or cancer If we are inhaling crystalline silica dust for a long time. The dust might be lodged in the lungs and continuously irritates them, reducing lung capacities.
Researches show inhaling crystalline silica gel dust can reduce the immunity of the employees who are exposed to it for long years. The employees with exposure to crystalline silica shown 10 fold higher than others of lupus and other systemic autoimmune diseases. Crystalline silica particles will not dissolve in the body over clinically relevant periods.
Once the silica gel crystals entered into the lungs, inside macrophages and dendritic cells it can activate the NLRP3 inflammation, and thereby result in the processing of pro-interleukin 1 beta into its mature form. As interleukin-1 Is a highly pro-inflammatory cytokine in the immune system, chronic exposure to silica may thereby account for some of its health hazards.
This effect can create difficulties for people working with sandblasting equipment, products that contain powdered crystalline silica desiccant, and so on. Children, asthmatics of any age, allergy sufferers, and the elderly can be affected in much less time. Amorphous silica, such as fumed silica is not associated with the development of silicosis but may cause irreversible lung damage in some cases.
Silica gel is very familiar to all. It is a common substance not only in-between industrial people but also in common people. It is a desiccant. It can absorb moisture around 60 to 65 percentage of its maximum weight. Therefore it can be used to protect items which are being damaged due to moisture.
Contrary to its name, silica gel is really a dry solid that absorbs and holds water vapor. Silica Gel is normally found in the form of pearls or beads. These beads contains a porous structure material that allows the beads to freely absorb moisture from the surroundings.
Benefits of Silica Hydrogel: Synthetic amorphous silica hydrogel is ideally fitted to use as an adsorbent in refining edible oils, offering variety of environmental and price benefits. To attract polar impurities from the oil, the high water content trapped by the desiccant structure creates the ideal environment.
Contaminants like soaps, phospholipids and trace metals are drawn into the pores of the silica gel and adsorbed onto the silica surface which is populated with a high concentration of hydroxyl groups. The pore structure of the silica granules offers a high internal area to soak up the polar contaminants.
Each tiny particle of desiccants, typically 15 microns in size, is like a small sponge with a high adsorption capacity. For comparison, lets check typical properties of a bleaching clay-based natural silicate adsorbent and silica hydrogel.
Silica Hydrogel has a surface are m2/g 615 but clay based natural silicate has just 150. Pore volume also higher in silica gel as 1.31 mL/g and for clay based natural silicate it is 0.51 only. Average particle size of silica gel is in microns 17.5 and for silicate it is 21.1. Permeability is 0.11 for silica gel and 0.03 for clay based natural silicate.
Desiccants are used to avoid moisture damages. Cargo desiccants are nothing but the desiccants which are used to keep along with the cargo packs. Any good desiccant can be used, however some companies are using the specific cargo desiccants. In long time shipping, desiccants will help us to protect our cargo.
Silica gel can be used as a cargo desiccant. Many industries are transporting goods and cargoes by shipping. By transporting through shipping the chances to get damages due to container rain is high. Container rain is the moisture content developing due to the atmospheric temperature change during the travel.
To avoid these container rain, container desiccants can be used. These are known as shipping container desiccants, and are used to protect goods from moisture inside a shipping container. There are two types of container desiccants: gel and liquid water.
Silica gel desiccants are widely used as a cargo desiccant and the active ingredient for both categories such as gel and liquid is calcium chloride. The best way to protect your cargo is use a dehumidifier in your shipping container and container Insulation. Container insulation maintain the inside temperature warmer above the dew point, avoiding condensation from forming.
Cargo litters can use to absorb water content, but the most effective thing is cargo desiccants. Desiccants can absorb water content, so after a while they stop their absorption process. But one of the main advantages of silica gel is it is 100 % reusable.
To check the moisture absorbing ability of silica gel, just put a silica gel packet or a teaspoon of silica gel in a clean fabric bag, and tie up the opening of the bag. Make sure it is maximum tight so the silica granules cannot escape. keep this desiccant bags anywhere you want to absorb moisture to see the magic.
Silica Hydrogel Production and Properties: Silica gel is also known as aqua gel. Silica gel got that name because of its high moisture content. Silica gel contains 60 to 65 percentage of its weight. It is a combination of pure silicon dioxide and water. It is available as finely ground white powder or white clear crystals.
These products are generally called as synthetic amorphous silica gels. By reacting sodium silicate solution with an acid, we can produce silica hydrogel. sodium silicate solution is commonly known as water glass. It comprises a distribution of polymeric silicate anions with charge-balancing sodium cations.
Addition of a mineral acid destabilizes the silicate solution forcing the silicate polymers to form colloidal silica particles, known as a silica hydrosol (silica gel). The size of these silica hydrosol is typically 1.5 to 2.0 nm. However it depends on silica concentration, electrolyte level, amount of excess acid and temperature.
Silica gel is a known desiccant. It is widely using for industrial purposes. Colloidal silica particles are highly active. They continue to interact to form a solid close-packed structure with water, and immobilized within the matrix.
Desiccants have ability to absorb water contents. The rigid translucent silica hydrogel is broken into pieces and then washed to remove excess acid and salt by-product. Industries such as cargo and packaging have more advantages with silica gel. They can store their bulk quantity of cargoes along with the desiccants to avoid moisture damages.
Once the required pore structure has been developed, the particles are then milled and classified to give carefully controlled particle size distribution with excellent filtration properties and high purity. Desiccants should be stored in a closed circumstance.






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