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Sodium silicate solutions can also be used as a spin-on adhesive layer to bond glass to glass [21] or a silicon dioxide–covered silicon wafer to one another. [22] Sodium silicate glass-to-glass bonding has the advantage that it is a low-temperature bonding technique, as opposed to fusion bonding. [21]
An aqueous solution of sodium silicate is acidified to produce a gelatinous precipitate that is washed, then dehydrated to produce colorless silica gel. [6] When a visible indication of the moisture content of the silica gel is required, ammonium tetrachlorocobaltate(II) (NH 4) 2 [CoCl 4] or cobalt(II) chloride CoCl 2 is added. [6]
Sodium silicide (NaSi, Na 4 Si 4) is a binary inorganic compound consisting of sodium and silicon. It is a solid black or grey crystalline material. [1] Sodium silicide reacts readily with water yielding gaseous hydrogen and aqueous sodium silicate in an exothermic reaction (~175 kJ·mol −1): [2] 2 NaSi + 5 H 2 O → 5 H 2 + Na 2 Si 2 O 5
Sodium metasilicate is the chemical substance with formula Na 2 SiO 3, which is the main component of commercial sodium silicate solutions. It is an ionic compound consisting of sodium cations Na + and the polymeric metasilicate anions [– SiO 2− 3 –] n.
It is a hydrated sodium and aluminium silicate with the formula Na 2 Al 2 Si 3 O 10 ·2H 2 O. [4] The type locality is Hohentwiel, Hegau, Germany. [3] It was named natrolite by Martin Heinrich Klaproth in 1803. [3] The name is derived from natron (νατρών), the Greek word for soda, in reference to the sodium content, and lithos (λίθος ...
The subunits of colloidal silica particles are typically in the range of 1 to 5 nm. Whether or not these subunits are joined depends on the conditions of polymerization. Initial acidification of a water-glass (sodium silicate) solution yields Si(OH) 4. If the pH is reduced below 7 or if salt is added, then the units tend to fuse together in chains.
15 Best Low-Sodium Canned Soups, According to Dietitians
Sodium silicate fibres may be used for subsequent production of silica fibres, which is better than producing the latter from a melt containing SiO 2 or by acid-leaching of glass fibres. The silica fibres are useful for producing wet webs, filter linings and reinforcing the material.
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