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EC number: 226-109-5 | CAS number: 5281-04-9
Nanomaterial aspect ratio / shape
Administrative data
- Endpoint:
- nanomaterial aspect ratio/shape
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2019
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with national standard methods with acceptable restrictions
Data source
Reference
- Reference Type:
- other: unpublished report
- Title:
- Unnamed
- Year:
- 2 019
- Report date:
- 2019
Materials and methods
- Principles of method if other than guideline:
- Image analysis: manual image analysis according to REACH criteria (NanoDefine ParticleSizer)
Guidelines from NanoDefine are applied:
Method selection according to Gaillard et al., Nanoscale Adv., 2019, 1, 781
TEM image evaluation according to Verleysen et al., Materials 2019, 12, 2274; doi:10.3390/ma12142274 - GLP compliance:
- no
- Type of method:
- transmission electron microscopy
- Details on methods and data evaluation:
- Sample Preparation
Dispersion in ethanol; transfer to carbon-coated TEM-grids.
Test material
- Reference substance name:
- Calcium 3-hydroxy-4-[(4-methyl-2-sulphonatophenyl)azo]-2-naphthoate
- EC Number:
- 226-109-5
- EC Name:
- Calcium 3-hydroxy-4-[(4-methyl-2-sulphonatophenyl)azo]-2-naphthoate
- Cas Number:
- 5281-04-9
- Molecular formula:
- C18H14N2O6S.Ca
- IUPAC Name:
- calcium 3-hydroxy-4-[(1E)-2-(4-methyl-2-sulfonatophenyl)diazen-1-yl]naphthalene-2-carboxylate
- Test material form:
- solid: nanoform
Constituent 1
Data gathering
- Instruments:
- FEI Osiris 200kV
- Calibration:
- no data
- Reproducibility:
- no data
Results and discussion
Shape description
- Key result
- Shape:
- other: plate
- Remarks on result:
- other: The material is assigned to the “platelet” shape category.
Aspect ratio
- Key result
- x Dimension:
- 1.8
- St. dev.:
- 1.2
- y Dimension:
- 1
- Remarks on result:
- other: median (D50)
Applicant's summary and conclusion
- Conclusions:
- - The particles have a median aspect ratio of 1,8:1.
- The shape is “plate”. The material is assigned to the “platelet” shape category.
- The median (D50) of the particle size is 68,4 nm. The material is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.
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