Description
what is silica?
Silica is another name for silicon oxides – the most prevalent type being SiO2. It can be found in nature in crystalline form (as quartz sand), and it is the most abundant component of the earth’s crust. Amorphous silica, on the other hand, is industrially manufactured in a variety of forms – including silica gels, precipitated silica, fumed silica, and colloidal silica.
What does “colloidal” mean?
A colloid is a stable dispersion of particles – particles that are small enough that gravity doesn’t cause them to settle, but large enough not to pass through a membrane and allow other molecules and ions to pass freely. Particle sizes range from about 1 to 100 nm.
what is silica?
How does colloidal silica differ from fumed, fused, or precipitated silica?
Colloidal silica varies from other types of silica in several significant ways. The most noticeable difference is that it’s in liquid form, as opposed to powder. In addition, it has the widest ranging surface area, and its aggregate size can be as small as the actual size of the primary particle.
What is nano silica?
Within the construction industry aqueous dispersions of colloidal silica are also referred to as nano silica and used for example in geotechnical, shotcrete and other concrete applications. The term nano silica can also have a wider definition and include other types of silica in powder form.
what is silica?
What’s the difference between sodium silicate (water glass) and colloidal silica?
Colloidal silica consists of dense, amorphous particles of SiO2.The building blocks of these particles are randomly-distributed [SiO4]-tetrahedra. This random distribution is what makes amorphous silica different from crystalline silica – ordered on a molecular level. Sodium silicates are alkaline solutions with pH ranges of 12-13, compared to 9-11 for colloidal silica. Sodium silicates are also composed of silicate monomers, as opposed to colloidal silica composed of polymeric silicates.The composition of sodium silicates have a SiO2/Na2O ratio of approximately 3.4, whereas colloidal silica generally has a SiO2/Na2O ratio greater than 50. Finally, the viscosity of sodium silicates is much higher – closer to that of a syrup, while colloidal silicas have viscosities close to that of water.
Where can colloidal silica be used?
Collodial silica can be used in numerous applications and it enhances functionality in an ever-growing number of products. To give a couple of examples our products enhances the performance of waterborne coatings by delivering anti-soling properties as well as provides increased durability and strength in cementing operations. Choosing the right colloidal silica can be a challenge. Subtle differences in particle morphology, particle size, and ionic species can make all the difference.
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