Registration Dossier
Registration Dossier
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EC number: 479-950-7 | CAS number: 31274-51-8
Nanomaterial specific surface area
Administrative data
- Endpoint:
- nanomaterial specific surface area
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Study with accepted scientific standards
Data source
Reference
- Reference Type:
- other company data
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: calculation
- Principles of method if other than guideline:
- The specific surface area of powders may be determined by the BET gas adsorption
method; however, this method works only with dry powders. For dispersions, where
the particles are suspended in a liquid medium, the gas adsorption method is not
feasible.Thus, for dispersions like Tinosorb A2B, it is standard to calculate the
specific surface area from particle size measurements, assuming spherical particle
shape. From TEM and SEM pictures of Tinosorb A2B it is evident that this
assumption is reasonable [2]. As the milling process is always the same procedure,
these pictures can be regarded as representative. - GLP compliance:
- no
- Type of method:
- other: calculation
Test material
- Test material form:
- solid: nanoform
Constituent 1
Results and discussion
Specific surface area
- Specific Surface Area:
- 50.8 m²/g
- Remarks on result:
- other: average from particle size distribution.
Any other information on results incl. tables
When using the BET method for determination of the specific surface area in dry
powders, an integral value over all particle sizes results, representing the average
over the size distribution of the particles in the dry powder. Because BET is not
appropriate for particle dispersions, the corresponding experiment for an aqueous
dispersion was presented here. We report results from using dynamic light scattering
data for the determination of the particle size distribution of a Tinosorb A2B batch
and transforming those into an average value of the specific surface area of the
particles.
Applicant's summary and conclusion
- Executive summary:
Asp, Tinosorb A2B = 50.8 m²/g (average from particle size distribution)
This value, derived from the average particle size distribution, is slightly higher than
the value obtained using the median d(0.5). As is known from mathematical
descriptions of distribution functions, the mean or average value for the distribution is
not always the same as the median value for the same distribution function.
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