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Silica gel is irritating to the respiratory tract and may cause irritation of the digestive tract. Dust from the beads may cause irritation to the skin and eyes, so precautions should be taken. [33] Crystalline silica dust can cause silicosis, but synthetic amorphous silica gel is indurated, so it does not cause
Microcrystalline silica consists of minute quartz crystals bonded together with amorphous silica. Examples include flint and chert . Amorphous silica consists of kieselgur ( diatomite ), from the skeletons of diatoms , and vitreous silica, produced by heating and then rapid cooling of crystalline silica.
The three main classes of amorphous silica are pyrogenic silica, precipitated silica and silica gel. Among them, precipitated silica has the greatest commercial significance. In 1999, more than one million tons were produced, half of it is used in tires and shoe soles. [1] Like pyrogenic silica, precipitated silica is essentially not ...
Cationic polymers are among the main functional components of hair gel. The positive charges in the polymers causes them to stretch, making the gel more viscous.Hair gels resist natural protein conformations and allow hair to be styled and textured, because the stretched-out polymer takes up more space than a coiled polymer and thus resists the flow of solvent molecules around it.
The first part of the process is to create the colloid precursor which consists of the silica nanoparticles and the solvent. The initial silica nanoparticles are in an amorphous crystalline phase and the solvent is composed of trimethylsilyl chloride (TMCS) and ethyl alcohol. To synthesize hydrophobic nanostructured silica using this method ...
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The first crystalline silicic acid was prepared from the phyllosilicate natrosilite (Na 2 Si 2 O 5) in 1924. More than 15 crystalline acids are known and comprise at least six modifications of H 2 Si 2 O 5. Some acids can adsorb and intercalate organic molecules, and therefore are interesting alternatives to silica. [10]
The silicate wall of the pores is amorphous. Mesoporous silicates, such as MCM-41 and SBA-15 (the most common mesoporous silicates), are porous silicates with huge surface areas (normally ≥1000 m 2 /g), large pore sizes (2 nm ≤ size ≤ 20 nm) and ordered arrays of cylindrical mesopores with very regular pore morphology. The large surface ...