Registration Dossier

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other: unpublished study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Principles of method if other than guideline:
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:
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

Constituent 1
Chemical structure
Reference substance name:
6,15-dihydroanthrazine-5,9,14,18-tetrone
EC Number:
201-375-5
EC Name:
6,15-dihydroanthrazine-5,9,14,18-tetrone
Cas Number:
81-77-6
Molecular formula:
C28H14N2O4
IUPAC Name:
2,17-diazaheptacyclo[16.12.0.0^{3,16}.0^{4,13}.0^{6,11}.0^{19,28}.0^{21,26}]triaconta-1(30),3,6(11),7,9,13,15,18,21(26),22,24,28-dodecaene-5,12,20,27-tetrone
Test material form:
solid: nanoform

Data gathering

Instruments:
TEM: Philips CM120 120kV
Calibration:
no data
Reproducibility:
no data

Results and discussion

Shape description
Key result
Shape:
rod
Remarks on result:
other: The material is assigned to the “elongated” shape category.
Remarks:
The rods seem to be rigid.
Aspect ratio
Key result
x Dimension:
3
St. dev.:
1.7
y Dimension:
1
Remarks on result:
other: median (D50)

Applicant's summary and conclusion

Conclusions:
The particles have a median aspect ratio of 3:1.
The shape is “rod”.
The material is assigned to the “elongated” shape category. The rods seem to be rigid.