To make fumed SiO2 hydrophobic, the surface of the particles is modified with organic compounds. These compounds
create a hydrophobic coating on the silica surface, preventing water from wetting the particles.
This hydrophobicity makes the fumed SiO2 suitable for various applications where water repellency is desired.
SiO2, or silicon dioxide, is typically considered hydrophilic, meaning it has an affinity for water and can easily mix with or
dissolve in water. However, it is possible to modify the surface of SiO2 to make it hydrophobic, meaning it repels water.
One common method to make SiO2 hydrophobic is by coating its surface with a hydrophobic material. This can be achieved
by using various surface modification techniques such as chemical vapor deposition, plasma treatment, or self-assembled
monolayers. These methods can introduce hydrophobic functional groups onto the SiO2 surface, reducing its interaction with
water molecules.
Another approach to make SiO2 hydrophobic is by creating a hierarchical structure on its surface. This can be done by etching
or texturing the SiO2 surface to create micro or nanostructures. These structures can trap air pockets, reducing the contact
area between water and the SiO2 surface, resulting in a hydrophobic effect.
Overall, while SiO2 is naturally hydrophilic, it is possible to modify its surface to make it hydrophobic through various techniques
and coatings.
Anticorrosion Pigments, Inkjet Receptive Coating, Matting Agent
