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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.