Colloidal Silica - A Versatile Problem Solver, Product Article

Binder Applications

LUDOX® colloidal silica forms strong ionic and hydrogen bonds with granular and fibrous material.  These bonds are thermally stable and chemically inert making them especially useful for:

• Investment Casting Slurries
• Vacuum Formed Refractories
• Specialty Coatings
• Catalysts
• Insulation Board

Surface Modification Application

The silica particles in LUDOX® adhere well to many surfaces via ionic and hydrogen bonding.  Once applied to a surface the silica particles provide an increased coefficient of friction that is useful for:

• Paper & cardboard
• Flooring
• Polishing Slurries
• Industrial and architectural coatings

Flocculant Applications

LUDOX® colloidal silica is available in grades with anionic sol charge as well as cationic sol charge.  When added to solutions  LUDOX® particles bond ionically with particles of the opposite charge and fall out of suspension.  This makes LUDOX® an excellent flocculant for:

• Paper retention and drainage
• Beverage fining (beer and wine)
• Insulation board

The characteristics of LUDOX® Colloidal Silica and it's usefulness as a binder and surface modifier are further highlighted in the short video below.
 

Today, LUDOX® colloidal silica is used in applications ranging from a high temperature binder for the production of aerospace parts to a fining agent used to produce beer and wine. LUDOX® functions in commercial applications in three major ways; as a binder, surface modifier, and flocculant.LUDOX® colloidal silica forms strong ionic and hydrogen bonds with granular and fibrous material. These bonds are thermally stable and chemically inert making them especially useful for:The silica particles in LUDOX® adhere well to many surfaces via ionic and hydrogen bonding. Once applied to a surface the silica particles provide an increased coefficient of friction that is useful for:LUDOX® colloidal silica is available in grades with anionic sol charge as well as cationic sol charge. When added to solutions LUDOX® particles bond ionically with particles of the opposite charge and fall out of suspension. This makes LUDOX® an excellent flocculant for:The characteristics of LUDOX® Colloidal Silica and it's usefulness as a binder and surface modifier are further highlighted in the short video below.

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As foam bubbles collect and merge at the surface interface, the bubble walls begin to thin and break. Defoamers help accelerate the process, breaking all the bubbles, including the smaller ones. Typically, defoamers have surface-active properties and are insoluble in the foaming medium.

Link to Hebei Silicon Research Electronic Materials Co., L

Defoamers work by entering the bubble wall (lamella) in a process known as “bridging of the film.” During this process, the lamella is bridged by a defoamer droplet or hydrophobic particle such as silica. Once the defoamer enters the lamella, it creates a lens that will start to spread, causing the bubble wall to thin. The thickness of the lens also thins as it spreads, and movements in the medium alter its shape.

Stresses occur until the lens breaks, rupturing the lamella. The resulting lens has significantly less elasticity compared to the surfactant lens, which before application, stabilized the lamella. The destabilization caused by the film facilitates the rupture of the lamella. Defoamers destroy existing foam with the same mechanisms employed by antifoams.

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