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Diss Factsheets

Physical & Chemical properties

Nanomaterial Zeta potential

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Administrative data

Endpoint:
nanomaterial Zeta potential
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2021
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2021
Report date:
2021

Materials and methods

Test guideline
Qualifier:
no guideline available
Principles of method if other than guideline:
SOP QC ZetaSILs, 22. Sep. 2015: "Standardized Method for the Measurement of Zeta Potential of Synthetic Amorphous Silica and Silicates"
GLP compliance:
not specified
Type of method:
vibration potential

Test material

Constituent 1
Chemical structure
Reference substance name:
Zeolite, cuboidal, crystalline, synthetic, non-fibrous
EC Number:
930-915-9
Cas Number:
1318-02-1
Molecular formula:
M2/nO • Al2O3 • ySiO2 • wH2O (n is the valency of the cation M, predominantly Na, y can range from 0.64 to 8.8, and w is the number of water molecules (general formula) Na: 1.34 - 24.02%, Al: 2.20 - 39.51%, Si: 15.52 - 68.64% (general composition); additionally, depending on the water quality: Ca, Mg and K might be present below 6%
IUPAC Name:
Zeolite, cuboidal, crystalline, synthetic, non-fibrous
Test material form:
solid: particulate/powder
Remarks:
no surface treatment
Specific details on test material used for the study:
Name: Zeocros CG180 (P Zeolite)
Code No.: not stated
Appearance: White Powder
Composition: Zeolite, crystalline alumosilicate
CAS No.: 1318-02-1
EINECS No.: 215-283-8
Molecular Formula: -
Molecular Weight: -
Purity: 100%
Homogeneity: homogeneous material
Production Date: 16.11.2020
Expiry Date: not stated
Storage: Room Temperature: (20 ± 5°C)

Data gathering

Instruments:
Analytical Instrument Laser Diffraction: Bettersizer S3 Plus
Specification: S3 Plus
Serial number: A7874
Software: Bettersize Laser Particle Size Analysis System V 8.01
Producer: Dandong Bettersize Instruments Ltd.

Analytical Instrument Helium Pycnometry
Specification: 3P densi 100
Serial number: 303-200814002
Producer: 3P Instruments

Analytical Instrument Electroacoustic Spectrometry
Specification: DT 1202
Serial number: 350
Producer: Dispersion Technology, New York, USA

Calibration:
Density was determined via use of a thermostatic Helium pycnometer. An empty sample cell was calibrated with reference materials (in this case a steel sphere) with regards to its volume. The cell was loaded with the dried sample material and the volume of sample was determined by expanding a specific amount of Helium from the loaded sample cell into a manifold volume, thus allowing for the determination of occupied volume within the sample cell.
Reproducibility:
The zeta potential of Zeocros CG180 was determined via measuring the Colloidal Vibration Current of a dispersion containing the test item.
In order to achieve standardised conditions pre-treatment was requested. The pre-treatment procedure includes a dispersing step, ultra-sonication and centrifugation of the dispersion were not needed. The CVI was measured on the supernatant directly after centrifugation.
The results showed good reproducibility and were in the expected range for these materials.

Results and discussion

Zeta potential
Key result
Zeta potential:
-49.9 - -49.8 mV
St. dev.:
0.047 mV
pH:
11.1

Any other information on results incl. tables

The CVI measurement was repeated two times with the following result:


Colloidal Vibration Current mean value [mV(s/g)1/2]: 2771905 (SD 4187)

Applicant's summary and conclusion

Conclusions:
The calculated Zeta potential mean value was -49.9 mv (SD: 0.047).
Executive summary:

The zeta potential of the test item Zeocros CG180 in water was determined by measuring the Colloidal Vibration Current (CVI) of a dispersion of the test material.
The pre-treatment of the test item includes the production of a 10 wt.-% dispersion with a lab stirrer. Ultra-sonication and centrifugation was not needed.
The needed parameter particle size distribution of dispersion and density of raw material were measured by laser diffraction and He-Density method.