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EC number: 253-256-2 | CAS number: 36888-99-0
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:
- other: unpublished study report
- Title:
- Unnamed
- Year:
- 2 022
- Report date:
- 2022
Materials and methods
- Principles of method if other than guideline:
- Method selection according to Gaillard et al., Nanoscale Adv., 2019, 1, 781
- GLP compliance:
- no
- Type of method:
- transmission electron microscopy
- Details on methods and data evaluation:
- TEM image evaluation according to Verleysen et al., Materials 2019, 12, 2274; doi:10.3390/ma12142274
Sample preparation: Dispersion in ethanol; transfer to carbon-coated TEM-grids.
Test material
- Reference substance name:
- 5,5'-(1H-isoindole-1,3(2H)-diylidene)dibarbituric acid
- EC Number:
- 253-256-2
- EC Name:
- 5,5'-(1H-isoindole-1,3(2H)-diylidene)dibarbituric acid
- Cas Number:
- 36888-99-0
- Molecular formula:
- C16H9N5O6
- IUPAC Name:
- 5,5'-(1H-isoindole-1,3(2H)-diylidene)dipyrimidine-2,4,6(1H,3H,5H)-trione
- Test material form:
- solid: nanoform, no surface treatment
- Details on test material:
- Name of test substance: Pigment Yellow 139
Expiry date: 20 Jul 2030
Chemical name: 5,5'-(1H-isoindole-1,3(2H)-diylidene)dibarbituric acid
Physical state/appearance: Solid/orange
Storage conditions: Room temperature
Batch 200012P040
TEM: D50 = 55.8 nm (D10 = 24.6 and D90 = 195.2)
Aspect ratio: 1.9 : 1
shape: spherical
TEM: 19m2/g
Supplier: Sun Chemical Colors & Effects GmbH
Constituent 1
Data gathering
- Instruments:
- TEM: Thermo-Fisher Osiris 200 kV
Results and discussion
Shape description
- Key result
- Shape:
- spherical
- Remarks on result:
- other: The material is assigned to the “spheroidal” shape category
Aspect ratio
- Key result
- x Dimension:
- 1.9
- y Dimension:
- 1
- Remarks on result:
- other: median (D50)
Any other information on results incl. tables
The number-based concentration of particles with sizes below 100 nm (smallest feret diameter) is ~62%. The median (D50) of the particle size is 55.8 nm.
The material is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.
Applicant's summary and conclusion
- Conclusions:
- The particles have a median aspect ratio of 1.9:1.
The shape is “spherical”.The material is assigned to the “spheroidal” shape category.
The number-based concentration of particles with sizes below 100 nm (smallest feret diameter) is ~62%. The median (D50) of the particle size is 55.8 nm.
The material is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.
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