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Diss Factsheets

Administrative data

Endpoint:
nanomaterial Zeta potential
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study, no GLP compliance

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report date:
2011

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: Internal method for zeta potential "ACP 16022011"
Principles of method if other than guideline:
Zeta potential is a characteristic of the repulsive forces between particles. It is determined by measuring the speed of motion of a particle subjected to an electric fiels.
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
other: zetameter apparatus
Details on methods and data evaluation:
In general, a particle is negatively charged. A fixed positive ion layer surrounds it (the particle moves with this layer). Outside the particle, in the diffusion layer, the potential varies to achieve neutrality in the bulk solution. Zeta potential is the potential difference between the borders of the diffuse layer.
Zeta potential is a characteristic of the repulsive forces between particles. It is determined by measuring the speed of motion of a particle subjected to an electric fiels.

Test material

Constituent 1
Chemical structure
Reference substance name:
Tangled Multi-Walled Carbon Nanotubes
EC Number:
701-160-0
Cas Number:
7782-42-5
Molecular formula:
Hollow tubular carbon, 1-dimensional nano structures with hexagonal arrangement of carbon atoms
IUPAC Name:
Tangled Multi-Walled Carbon Nanotubes
Constituent 2
Reference substance name:
GRAPHISTRENGTH C100
IUPAC Name:
GRAPHISTRENGTH C100
Test material form:
solid: nanoform

Data gathering

Instruments:
The zetameter apparatus, from CAD Instrumentation Company, is equipped with a laser and a video camera. An electric field s applied between two electrodes separated by a distance of 11.5 cm in the horizontal quartz cell. The filling of the cell is done by a 50 ml syringe fitted with a 3 -way valve.
Prior to the introduction on the measurement cell, the CNT's suspension us sieved at 45µm.

Results and discussion

Zeta potentialopen allclose all
Zeta potential:
ca. -44.99 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 1
Zeta potential:
ca. -42.62 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 2
Zeta potential:
ca. -44.59 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 3
Zeta potential:
ca. -36.74 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 4
Zeta potential:
ca. -41.49 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 5
Zeta potential:
ca. -44.78 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 6
Zeta potential:
ca. -46.61 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 7
Zeta potential:
ca. -49.18 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 8
Zeta potential:
ca. -47.07 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 9
Zeta potential:
ca. -40.93 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 10
Zeta potential:
ca. -41.63 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: Trial 11
Key result
Zeta potential:
ca. -43.69 mV
St. dev.:
3.46 mV
Medium:
NaCl solution at 1g/L, sieved at 45µm and at 21.3°C
Remarks on result:
other: average

Any other information on results incl. tables

Eleven measurements have been performed, resulting in a mean value of -43.69 mV with a standard deviation of 3.46 mV.

pH was 6.5 -7 during the experiement.

Applicant's summary and conclusion

Conclusions:
Zeta potential of CNTs particles in suspension in NaCl solution at 1 g/l and sieved at 45µm is -44 mV at 21.3°C
Executive summary:

The zeta potential of carbon nanotubes powder was determined using internal methodACP 16022011. This test shows that the test item has a zeta potential of -44 mV at 21.3°C.