| |
Operation
Superior engineering delivers years of trouble-free surface area analysis and pore size measurement. All process control features are self-contained, enabling the instrument to function independently without operator intervention or external computer support.
Critical Components
 |
High sensitivity pressure transducer |
|
High resolution 16-bit A/D converter |
|
Robust dewar elevator |
|
Filter gaskets to prevent vacuum system contamination by powdered samples |
|
Reliable solenoid valves and leak-free (10-9 cc/sec) dosing manifold |
|
Precision coolant level control |
Sample Preparation
Each NOVA offers up to four built-in, microprocessor-controlled degassing stations with independent flow rate selection for each station. Sample preparation may be performed under vacuum or flow conditions with temperature selection from ambient to 450°C.
Results
 |
Single- and multi-point B.E.T. surface area with Y-intercept, "C" constant, slope and correlation coefficient. |
|
Adsorption and desorption isotherms. |
|
B.J.H. pore size distribution calculated from the adsorption or desorption isotherm. |
|
Total pore volume. |
|
Sample density. |
Results with NOVAWin 2 software
|
Isotherms: |
User-selectable number of data points at any desired target pressures |
|
BET Surface Area: |
Single point, multi-point, slope, intercept, "C" constant, correlation coefficient, tabular and graphic format |
|
Langmuir Surface Area: |
Multi-point, slope, intercept, correlation coefficient, tabular and graphic format |
|
BJH Pore Size Distribution: |
Volume, area, adsorption, desorption, cumulative, derivative (linear and logarithmic), interpolated, tabular and graphic format |
|
Dollimore-Heal Pore Size Distribution |
Volume, area, adsorption, desorption, cumulative, derivative Distribution (linear and logarithmic), tabular and graphic format |
|
Dubinin-Radushkevich
Micro Pore Area: |
Slope, intercept, correlation coefficient, average pore size, micropore volume, average adsorption energy, tabular and graphic format |
|
Total Pore Volume: |
At user-selectable P/P0 |
|
Average Pore Size: |
Radius, diameter |
|
Statistical Thickness: |
de Boer, Halsey or Carbon Black models |
|
t-Method: |
Micropore area, mesopore area, micropore volume, correlation coefficient, tabular and graphic format |
|
Non-local Density Functional Theory methods (NLDFT)- |
Large library of "kernels" for nitrogen, argon and carbon dioxide adsorbates, in different pore geometries such as cylinders,
slits and spheres, at different temperatues from 77K to 273K. |
|
Other Pore Size Models: |
MP, Horvath-Kawazoe (HK), Dubinia-Astakhov (DA), Saito-Foley (SF), tabular and graphic format. |
|
GCMC Method: |
CO2 - carbon at 273K based on a slit-pore model |
|
Fractal Dimensions: |
Neimark-Kiselev (NK), Frenkel-Halsey-Hill (FHH) |
|
