The material in question is not "fused" silica and can be characterized as amorphous. Unlike fused silica, which is made at very high temperatures exceeding 1000°C to densify and crystallize it, the material is based on the Stober process and does not undergo temperatures greater than 150°C. This amorphous versus crystalline distinction could account for the difference in refractive index.
904376
Silica
monodisperse, non-porous, 20 μm
Synonym(s):
Monodisperse silicon dioxide, Non-porous silica, Non-porous silicon dioxide, Silica, Silicon dioxide
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All Photos(2)
About This Item
Linear Formula:
SiO2
CAS Number:
Molecular Weight:
60.08
MDL number:
UNSPSC Code:
41123003
NACRES:
NA.23
Pricing and availability is not currently available.
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form
powder
bp
2230 °C (lit.)
mp
>1600 °C (lit.)
SMILES string
O=[Si]=O
InChI
1S/O2Si/c1-3-2
InChI key
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
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Application
Monodisperse nonporous silica nanoparticles find application in drug delivery and molecular imaging[1][2] whereas micron sized particles are used in liquid chromatography[3]. We offer highly monodisperse (coefficient of variance <10%) nonporous silica in size varying from 150 nm to 50 μm. The high monodispersity of our particles makes them suitable for aforementioned applications.
Storage Class Code
11 - Combustible Solids
WGK
nwg
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
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Could you please confirm if 904376-2G is made of fused silica? It was found that the refractive index of the microspheres is lower than the expected value for fused silica by about 0.023. For instance, at 1100nm, the measured refractive index is 1.426, while the value for fused silica is expected to be 1.449. If it is indeed fused silica, is there a reason why the refractive index is lower than the expected value?
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