18649

Silicon dioxide

acid washed

• Sinonimo/i: Cristobalite, Quartz, Sand, Silica
• Formula condensata: SiO₂
• Numero CAS: 60676-86-0
• Peso molecolare: 60.08
• Numero MDL: MFCD00011232
• Codice UNSPSC: 12352303
• ID PubChem: 57647755
• NACRES: SB.52

Proprietà

• Forma fisica: solid
• Livello qualitativo: 100
• Qualità: acid washed
• Impurezze: ≤0.01% in acid soluble iron (Fe); ≤0.5% soluble in HCl
• Perdita: ≤0.5% loss on ignition, 800 °C
• Indice di rifrazione: n20/D 1.544 (lit.)
• Punto di fusione: 1610 °C (lit.)
• Densità: 2.6 g/mL at 25 °C (lit.)
• Anioni in tracce: chloride (Cl^-): ≤100 mg/kg
• Stringa SMILE: O=[Si]=O
• InChI: 1S/O2Si/c1-3-2; VYPSYNLAJGMNEJ-UHFFFAOYSA-N

Descrizione

Descrizione generale

Silicon dioxide (SiO₂) exists in three crystalline forms, namely quartz, tridymite and cristobalite. It reacts with hydrofluoric acid to form silicon tetrafluoride (SiF₄) and water. Silicates are formed on reacting SiO₂ with alkali melts. SiO₂ is the main component in glass, brick and concrete and also forms the insulator in silicon devices. The alteration of the surface of SiO₂ with (3-aminopropyl)triethoxysilane (APTES) for binding lactate dehydrogenase (LDH) to form an amino layer has been reported. The silicon-silicon dioxide structure has been investigated at liquid nitrogen temperature by electron spin resonance spectra.

Applicazioni

Silicon dioxide may be used to produce silicon by electrochemical reduction in the presence of calcium chloride (CaCl₂) electrolyte. It may also be used to prepare FeCl₃/SiO₂, a supported reagent for the oxidative coupling reactions.

Informazioni sulla sicurezza

• Codice della classe di stoccaggio: 11 - Combustible Solids
• Classe di pericolosità dell'acqua (WGK): nwg
• Punto d’infiammabilità (°F): Not applicable
• Punto d’infiammabilità (°C): Not applicable
• Dispositivi di protezione individuale: Eyeshields, Gloves, type N95 (US)