Of all the oxide minerals in the Earth&#;s crust, silicon dioxide, or silica, is the most abundant. It is present in not only in combination with other oxide minerals but also in its isolated forms such as sand. The semi-precious mineral opal is a form of amorphous silica that has been prized for centuries.
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Besides being the most abundant mineral on the Earth, it is also very important to life on our planet. Diatoms, a type of phytoplankton forming the base of the ocean&#;s food chain, have skeletons composed of silica. Many plants use silica to stiffen stems for holding fruit and to form external needles for protection. The role of silica is less obvious in animals, but each one of us contains about half a gram of silica &#; without which our bones, hair, and teeth could not be formed.
Not only does silica play an important role in biology, it had played an important role in civilization. Flint is a form of silica that was used in ancient tools.The sand used in pottery is also a form of silica. Two-thousand year-old Roman cement contains amorphous silica from volcanic ash which helps give it high strength and durability. Present technology would be very different without the silica used to create the catalysts of our oil refineries, bind the molds for casting super-alloys, form modern glass and ceramics, and polish electronic materials.
Colloids are defined as a stable suspension of microscopic particles or molecules distributed throughout a second substance known as a dispersion medium. They differ from other types of suspensions in that the colloid is evenly dispersed throughout the suspension, and does not separate or settle. Colloids may be any combination of liquid, solid, and gaseous colloids and dispersion media.
Colloids are prevalent in a variety of common products and produced by various environmental and natural circumstances as well. They typically fall into one of the following categories:
Colloidal silica consists of silica molecules suspended in liquid, thereby forming a liquid sol. The process of creating colloidal silica is closely monitored to ensure that the silica molecules remain stable and separate within the liquid medium without collapsing into smaller component molecules or collecting into unstable silica gels. The liquid dispersion medium exhibits greater density than water and must be electrostatically treated for enhanced ionic stabilization.
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Colloidal silica is highly fluid with low viscosity. Uses for colloidal silica vary depending on the size of the silica particles in the solution and the modifiable pH, ionization, and surface charge.
Applications that use colloidal silica vary widely. It can be used to enhance or direct the movement of substances within various processes. For example, it is used in the paper manufacturing process to draw liquid from the finished paper quickly, thereby allowing the paper to dry faster while retaining its strengthening starch. Similarly, colloidal silica can be used to absorb moisture in industrial settings where moisture levels are high. Depending on the size of its constituent particles, colloidal silica may be used to enhance the movement of materials or to increase surface friction.
Colloidal silica is used in a broad range of industries and applications, including:
Applied Material Solutions is pleased to offer high-purity, customizable colloidal silica products that can be tailored to meet the specific needs of a variety of applications. Our proprietary manufacturing process produces a uniform distribution profile to ensure a low percentage of off-size particles and contaminants.
Our goal is to provide our partner companies with colloidal silica to match their specified requirements, while also offering controlled particle size distribution for consistent application performance.
Our products are available in a broad range of sizes, hydrophobicity levels, and surface areas. We are also pleased to offer products in winterized, food-grade, and technical-grade designs, to meet industry standards.
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