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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 Zeta potential
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report date:
2017

Materials and methods

Principles of method if other than guideline:
The isoelectric point (IEP) or point of zero zeta potential (PZC) was automatically determined using the Zeta Sizer nano ZSP with a Multi Purpose Titrator MPT2 (Malvern Instruments Ltd, Malvern, UK). The pH condition of the sample was altered by using the auto-titrator and the sample was circulated into the disposable capillary cell situated in the Zetasizer Nano for the zeta potential measurements to be made. The data was processed in a plot of the zeta potential of a sample measured as a function of pH.
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Silver
EC Number:
231-131-3
EC Name:
Silver
Cas Number:
7440-22-4
Molecular formula:
Ag
IUPAC Name:
Silver
Test material form:
solid: nanoform, surface-treated
Remarks:
paste of nanomaterial
Details on test material:
Spherical particles
Particle size distribution (primary particles; number-based): Min = 11 nm, D25 = 25 nm, D50 = 34 nm, D75 = 48 nm, Max = 161 nm
Volume specific surface area: 150 m2/cm3
Zeta potential: -23.3 mV

Data gathering

Instruments:
Multi Purpose Titrator MPT2 (Malvern Instruments Ltd, Malvern, UK)

Results and discussion

Zeta potential
Zeta potential:
-23.3 mV
St. dev.:
6.3 mV
Medium:
water
Remarks on result:
other: the zetapotential was only measured in the sample diluted in the proportion of 1:1000 with demineralised water
Isoelectric point
Isoelectric Point:
< 1
Medium:
water
Remarks on result:
other: The IEP was determined by diluting a sample in the proportion of 1:5000 with demineralised water.

Applicant's summary and conclusion

Conclusions:
The zetapotential of nanosilver Sample 2 is -23,3 mV and the IEP is lower than pH 1.