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Diss Factsheets

Physical & Chemical properties

Nanomaterial specific surface area

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Administrative data

Endpoint:
nanomaterial specific surface area
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
ISO 9277 Determination of the specific surface area of solids by gas adsorption - BET method
Version / remarks:
2010
GLP compliance:
yes (incl. QA statement)
Remarks:
(Landesamt für Umw elt-, Wasserw irtschaft und Gew erbeaufsicht, Rheinland-Pfalz)
Type of method:
BET

Test material

Constituent 1
Chemical structure
Reference substance name:
Silicic acid, aluminum magnesium sodium salt
EC Number:
234-919-5
EC Name:
Silicic acid, aluminum magnesium sodium salt
Cas Number:
12040-43-6
Molecular formula:
Na(0.017-1.739)Mg(0.008-0.823)Al(0.002-0.2473)SiO(2.018-3.837)
IUPAC Name:
aluminium(3+) magnesium(2+) sodium tris(oxosilanebis(olate))
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder

Data gathering

Instruments:
Quantachrome Poremaster 60-GT
Quantachrome Autosorb-3

Results and discussion

Specific surface area
Key result
Specific Surface Area:
57.9 m²/g

Any other information on results incl. tables

Measured BET surface area: 57.9 m²/g.

It must be notified thet the empirically determined specific surfce area, according to George W. Sears, jr., is ten times higher than the surface determined via BET analysis.

Expert judgement:

The difference between the BET surface area (57.9 m²/g) and the specific surface area (588.6 m²/g) by titration is caused by interaction of the sodium hydroxide with aluminium ions in the substance. This phenomen was unexprected and will require a different set-up of the titration which should include a metal analysis, e.g. solved aluminium.

Applicant's summary and conclusion

Conclusions:
Specific surface area = 57.9 m²/g