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Hydrophilic Fumed Silica

Hydrophilic fumed silica refers to fumed silica nanoparticles that exhibit a strong attraction to water. Fumed silica, also known as pyrogenic silica, is a finely divided form of silicon dioxide (SiO2) produced by burning silicon tetrachloride or silicon compounds in a flame of hydrogen and oxygen. These nanoparticles have a remarkably high surface area and are characterized by their porous structure.

In contrast to hydrophobic fumed silica, which is treated to repel water, hydrophilic fumed silica retains its natural affinity for water. This means that the surface of the nanoparticles readily interacts with water molecules, promoting good dispersion and wetting properties in aqueous solutions.

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Applications

Rheology control: Hydrophilic fumed silica is commonly used as a rheology modifier in various formulations such as paints, coatings, adhesives, and sealants. It helps to adjust viscosity, improve stability, and control flow characteristics, thereby enhancing the performance of these products.

Thixotropic agent: In many formulations, hydrophilic fumed silica serves as a thixotropic agent, meaning it can transform from a gel-like consistency to a more fluid state when subjected to mechanical agitation. This property is valuable in applications such as printing inks, where it helps prevent sagging and dripping during application.

Pharmaceutical applications: Hydrophilic fumed silica finds use in pharmaceutical formulations as a suspension aid, binder, and disintegrant in tablets and capsules. It improves powder flow properties, enhances drug dispersion, and facilitates controlled release of active ingredients.

Personal care products: In cosmetics and personal care products, hydrophilic fumed silica is utilized as a thickening agent, suspending agent, and abrasive in toothpaste formulations, creams, lotions, and hair care products. It helps to achieve the desired texture, stability, and performance characteristics.

Food and beverage industry: Hydrophilic fumed silica is approved for use as a food additive and is employed in powdered products such as spices, flavorings, and powdered drinks to prevent caking and improve flowability. It also acts as a thickening agent in certain food formulations.

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