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Physical & Chemical properties

Nanomaterial porosity

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Administrative data

Endpoint:
nanomaterial porosity
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
other: Mercury Porosimetry (DIN 66133)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: True Density by He-Pycnometrie (DIN 66137-2)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: BET surface area (DIN ISO 9277)
Deviations:
no
GLP compliance:
yes
Type of method:
BET
Remarks:
DIN ISO 9277
Details on methods and data evaluation:
Pore analysis by mercury porosimetry is performed with a PORENIASTER GOGT. The method is based on the Washburn-Equation, which describes the relationship between pore diameter and applied pressure for a non-wetting liquid like mercury.
Using the POREIVIASTER 60 GT, filling of the penetrometers before analysis is performed in horizontal position: due to this fact a hydrostatic mercury pressure on the sample is also avoided as a non—detected pore filling. The resulting intrusion curves will be plotted over pressure, resp. pore diameter. Because the measurement starts at low pressures, large pores will be filled first and therefore - in standard cases — pore size decreases from left to right side of the chart.

Test material

Constituent 1
Chemical structure
Reference substance name:
Silicic acid, aluminum magnesium sodium salt
EC Number:
234-919-5
EC Name:
Silicic acid, aluminum magnesium sodium salt
Cas Number:
12040-43-6
Molecular formula:
Na(0.017-1.739)Mg(0.008-0.823)Al(0.002-0.2473)SiO(2.018-3.837)
IUPAC Name:
Aluminium (3+) magnesium (2+) sodium oxosilanediolate
Test material form:
solid: particulate/powder

Data gathering

Instruments:
Pore analysis by mercury porosimetry is performed with a Quantachrome POREMASTER 60GT.
True Density: ULTRAPYC 1200eT was used for gas pycnometry.
BET surface area: QUANTACHROME AUTOSORB-3, with nitrogen, at 77 K

Results and discussion

Porosity (fraction of void space in the material)
Key result
Mean:
73.2 %
Specific pore volume
Key result
Mean:
1.267 cm³/g
Modal pore diameter
Key result
Mean:
0.3 other: µm

Any other information on results incl. tables

From the Normalized Volume curve one could see, that there is a more or less continuous intrusion from approx. 200 µm down to approx. 0,01 µm.The first part in the range between 200 µm and 0,4 µm we would interpret as filling of inter-particle-void. Below 0,4 µm the intrusion curves becomes much more steep. This range we would see as pore filling.

He-Density

Total-

Intrusion-

Volume

Inter-Particle-

Void

Pore-Volume

Most frequent pore diamter (Mode)

Porosity

Particle

Density

[g/cm3]

[ cnfYg]

[ cnfYg]

[ cm3/g]

[\im]

[%]

[g/cm3]

2.151

2.945

1.673

1.267

0.30

73.2

0.577

Remarks to the table:

     The most frequent pore diameter represents the peak maximum of the poresize distribution curve

      Porosity = PoreVolume / (PoreVolume + 1/He-Density) x 100%

      Particle-Density = 1 / (PoreVolume + 1 /He-Density)

Result for BET surface area: multipoint-BET: 57,9 m2/g

Applicant's summary and conclusion

Conclusions:
Test item shows a porosity of 73.2% with 0.3 µm as most frequent pore diameter and a specific pore volume of 1.267 cm³/g.