Registration Dossier
Registration Dossier
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EC number: 214-161-1 | CAS number: 1103-39-5
Nanomaterial aspect ratio / shape
Administrative data
- Endpoint:
- nanomaterial aspect ratio/shape
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2022
- 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:
- study report
- Title:
- Unnamed
- Year:
- 2 022
- Report date:
- 2022
Materials and methods
- Principles of method if other than guideline:
- Nanoform compliance with REACH dossier ((EU) 2018/1881), French nano registration and Belgium nano registration (if mono-substance).
TEM particle size of primary particles and aggregates. Prepare sample in duplicate. Measure around 150 primary particles and several aggregates most representative of the TEM pictures. - GLP compliance:
- no
- Type of method:
- transmission electron microscopy
- Details on methods and data evaluation:
- The pigment was dispersed in ethanol, 140 measurements were taken.
Test material
- Reference substance name:
- Calcium bis[2-[(2-hydroxynaphthyl)azo]naphthalenesulphonate]
- EC Number:
- 214-161-1
- EC Name:
- Calcium bis[2-[(2-hydroxynaphthyl)azo]naphthalenesulphonate]
- Cas Number:
- 1103-39-5
- Molecular formula:
- C20H14N2O4S.1/2Ca
- IUPAC Name:
- calcium bis{2-[(2-hydroxy-1-naphthyl)diazenyl]naphthalene-1-sulfonate}
- Reference substance name:
- Resin acids and Rosin acids, calcium salts
- EC Number:
- 232-694-8
- EC Name:
- Resin acids and Rosin acids, calcium salts
- Cas Number:
- 9007-13-0
- Molecular formula:
- not applicable
- IUPAC Name:
- Resin acids and Rosin acids, calcium salts
- Reference substance name:
- Reference substance 001
- Cas Number:
- 73612-32-5
- Molecular formula:
- C40H26CaN4O8S2
- Details on test material:
- Batch CHILJ709
Constituent 1
additive 1
additive 2
Data gathering
- Instruments:
- no data
Results and discussion
Shape descriptionopen allclose all
- Key result
- Shape:
- rod
- Percentage:
- 32 %
- Remarks on result:
- other: elongated shape category
- Key result
- Shape:
- spherical
- Percentage:
- 68 %
- Remarks on result:
- other: spheroidal shape category
- Remarks:
- (spherical, cubic,polyhedral)
Aspect ratioopen allclose all
- Key result
- x Dimension:
- 3.8
- y Dimension:
- 1
- Remarks on result:
- other: average aspect ratio of elongated shape category
- Key result
- x Dimension:
- 2.1
- y Dimension:
- 1
- Remarks on result:
- other: average aspect ratio of spheroidal shape category
Any other information on results incl. tables
The results represented the primary particles.
The particles with sizes below 100 nm are in the range of 98-100%. The median (D50) of the particle size is ca. 34 nm.
Applicant's summary and conclusion
- Conclusions:
- The primary particles of spheroidal shape category have an average aspect ratio of 2.1:1
The primary particles of elongated shape category have an average aspect ratio of 3.8:1
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