Silica glass Chemical Properties

Melting point:

1610 °C(lit.)

Boiling point:

>100 °C(lit.)

Density 

2.6 g/mL at 25 °C(lit.)

refractive index 

n20/D 1.544(lit.)

storage temp. 

no restrictions.

form 

tablets (~0.5 g each)

Water Solubility 

Insoluble in water.

Exposure limits

NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3

InChI

InChI=1S/O2Si.H2O/c1-3-2;/h;1H2

InChIKey

LRCFXGAMWKDGLA-UHFFFAOYSA-N

SMILES

[Si](=O)=O.O

EPA Substance Registry System

Silica, hydrate (10279-57-9)

Safety Information

Hazard Codes 

Xn

Risk Statements 

48/20

Safety Statements 

22

WGK Germany 

3

RTECS 

VV7340000

F 

3

HS Code 

2811 22 00

Toxicity

LD50 orally in Rabbit: > 10000 mg/kg LD50 dermal Rabbit > 5000 mg/kg

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Silica glass Usage And Synthesis

Structure

Silica glass is a continuous network of corner-sharing SiO4 tetrahedra where each oxygen bridges two tetrahedra (i.e. only Q4 speciation). However, a more complex system might contain 75% Q3 (tetrahedra with one free non-bridging oxygen) and 25% Q2 (two non-bridging oxygens). For silica glasses, the first diffraction peak, Q1, has been associated with intermediate-range ordering with a periodicity of 2π/Q1 ~ 6 Å. This ordering beyond the first few nearest neighbour tetrahedra arises from the boundaries between successions of cages comprising a 3-D covalent network structure. Therefore, the position and shape of the first sharp diffraction peak Q1 can provide information on different-sized ring distributions within the material. The second diffraction peak at position Q2 has been linked to chemical or extended range ordering with a periodicity of 2π/Q2 ~ 3 Å, and the local Si–O–Si and O–Si–O bond-angle distributions can persist to distances as large as > 5 Å.

Uses

Typical properties: S.A.250m^2/gSilicon oxide is used as a catalyst support material having a high surface area. It acts as a medium to which catalyst is affixed. Several metals such as platinum, rhodium, ruthenium, silver, copper, nickel, iron, manganese, cobalt, tungsten and gold are supported over silicon dioxide and used as a catalyst in synthetic chemistry for various applications. For example, silica-supported gold catalysts is used for carbon monoxide oxidation by a solution-based technique.

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