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EC number: 215-222-5
CAS number: 1314-13-2
As study was conducted by the MCA in
Cambridge, 2011 to determine the porosity of the NMs. A Micromeritics
TriStar II (3020) was used for the collection of nitrogen adsorption /
desorption isotherm data up to a saturation pressure of approximately
0.995 P/P0. The analysis was typically conducted to measure 45
adsorption relative pressure points and 23 desorption relative pressure
points. Samples were outgassed overnight in vacuum at 300 °C using a
Micromeritics VacPrep apparatus prior to analysis. In order to indicate
any possible microporous nature of the materials additional relative
pressure data were also collected at pressures lower than the usual
starting point for analyses using this instrument. These were in the
approximate range 0.005 to 0.01 P/P0. Whilst the data reduction methods
available are unsuitable for application to the micropore range the
characteristic shape of the adsorption isotherm at these low partial
pressures would provide a good indication of the presence of micropores
in the sample material. The sample tube dead space was measured for each
analysis using helium (CP grade) thus providing warm and cold freespace
values. Samples requiring only BET surface area analysis were analysed
using the same equipment with the application of the same freespace
measurement technique. BET surface area was calculated using partial
pressures in the nominal range 0.07 to 0.25.
The pore size distribution is
presented as pore size by volume and area from the adsorption isotherm
using the BJH method. The pore size distribution data presented in the
BJH reports is applied to a maximum of 1000 Å. The total pore volume of
the materials is calculated from the volume of nitrogen adsorbed at the
maximum relative pressure obtained on the adsorption branch of the
isotherm. The porosity was determined to be 0.041538 cm3/g for NM-110,
0.071347 cm3/g for NM-111, 0.158354 cm3/g for NM-112 and 0.013820 cm3/g
for NM-113 respectively.
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