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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

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)

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other: unpublished study report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:
Tetramethyl 2,2'-[1,4-phenylenebis[imino(1-acetyl-2-oxoethane-1,2-diyl)azo]]bisterephthalate
EC Number:
271-176-6
EC Name:
Tetramethyl 2,2'-[1,4-phenylenebis[imino(1-acetyl-2-oxoethane-1,2-diyl)azo]]bisterephthalate
Cas Number:
68516-73-4
Molecular formula:
C34H32N6O12
IUPAC Name:
tetramethyl 2,2'-{1,4-phenylenebis[imino(1,3-dioxobutane-2,1-diyl)diazene-2,1-diyl]}diterephthalate
Test material form:
solid: nanoform

Data gathering

Instruments:
Thermo-Fisher Talos 200kV

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:
3
St. dev.:
2.2
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 99%. The median (D50) of the particle size is 34.2 nm.

Applicant's summary and conclusion

Conclusions:
- The particles have a median aspect ratio of 3,0:1.
- The material is assigned to the “spheroidal” shape category. The shape is “spherical”.
- The number-based concentration of particles with sizes below 100 nm (smallest feret diameter) is 99%. The median (D50) of the particle size is 34.2 nm.
The material is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.