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EC number: 285-349-9 | CAS number: 85085-18-3
Nanomaterial specific surface area
Some information in this page has been claimed confidential.
Administrative data
- Endpoint:
- nanomaterial specific surface area
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- April 2013
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Data source
Reference
- Reference Type:
- other company data
- Title:
- Unnamed
- Year:
- 2 013
Materials and methods
Test guideline
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- ISO 9277 Determination of the specific surface area of solids by gas adsorption - BET method
- Version / remarks:
- The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorb gas corresponding to a monomolecular layer on the surface. Physical adsorption results from relatively weak forces (van der Waals forces) between the adsorbate gasmolecules and the adsorbent surface area of the test powder. The determination is usually carried out at the temperature of liquid nitrogen.
The amount of gas adsorbed can be measured by a volumetric or continuous flow procedure - Deviations:
- not specified
- GLP compliance:
- yes
- Type of method:
- BET
- Details on methods and data evaluation:
- Equipment: Micromeritics Tristar II 3020 Porosimeter (with Nitrogen as Absorbate gas) with Micromeritics
SmartPrep. The analysis was performed according to SOP 099.02 Issue 1
Special Reagents - Glass Reference Material with a surface area of 7.7m2/g.
Reference material results were satisfactory
Instrument Parameters:
The samples were conditioned overnight (i.e. minimum of 16 hours) at 40°C, with a Nitrogen gas purge, cooled and then run on the porosimeter
A relative nitrogen pressure range of 0.05 – 0.30 P/Po was assessed, with a minimum of 3 points within this range used to obtain acceptable
correlation coefficients of > 0.9975
Test material
- Reference substance name:
- Silicate(2-), hexafluoro-, disodium, reaction products with lithium magnesium sodium silicate
- EC Number:
- 285-349-9
- EC Name:
- Silicate(2-), hexafluoro-, disodium, reaction products with lithium magnesium sodium silicate
- Cas Number:
- 85085-18-3
- Molecular formula:
- Na0.7[Mg5.3Li0.7Si8O20(OH)0.0F4.0]
- IUPAC Name:
- Synthetic fluorohectorite
- Test material form:
- solid: particulate/powder
- Details on test material:
- Batch Number: 09-2151-1 (Type 1)
Date Manufactured: Type 1 – 2nd June 2009
Constituent 1
Data gathering
- Instruments:
- Micromeritics Tristar II 3020 Porosimeter (with Nitrogen as Absorbate gas) with Micromeritics SmartPrep.
- Calibration:
- Glass Reference Material with a surface area of 7.7m2/g was used to calibrate the instrument
- Reproducibility:
- Within 10% of the certified value, which was deemed to be acceptable according to the SOP
Results and discussion
Specific surface area
- Key result
Applicant's summary and conclusion
- Conclusions:
- The surface area by nitrogen absorption of this substance is found to be around 418 m2/g
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