Dubinin Report
The Dubinin method provides pore volume distributions for microporous materials by making use of an expression for the adsorption potential.
Field or Button | Description | ||
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Adsorptive [button] | Displays the Adsorptive Options window. The recommended adsorptives and their values are shown. Up to eight adsorptive and adsorbate property factor combinations may be specified. |
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Fitted Relative Pressure Range [group box] |
Enter the minimum and maximum limits for Radushkevich or Astakhov relative pressures included in the line fit. | ||
Pressures [button] | Use to select a pressure range for report calculations and points for exclusion from calculations. Calculation pressure range. Enter the minimum and maximum pressures to be used in the pressure table.To exclude a point from the calculations used to generate the report, select Exclude. Exclude All. Select to exclude all pressure points in the table. Include All. Select to include all pressure points in the table. |
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Report Type [group box] |
Select report types. If Astakhov is selected, either select Optimize exponent or enter an appropriate exponent value in the text box. | ||
Select Reports [group box] |
Select the reports to generate. Highlight the report, then click Edit to modify report options. | ||
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Dubinin Pore Volume Report Options
In the Dubinin Report Options window, highlight dV/dw Pore Volume in the Selected Reports list box, then click Edit.
This option plots differential pore volume as a function of pore width.
Field or Button | Description | ||
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Autoscale x-axis / Autoscale y-axis [check box] |
Select an option to have the x- and/or y-axes scaled automatically. Both axes begin at 0; the system uses the highest values collected during analysis as the ending points for axis ranges. Enable to enter beginning and ending values manually. |
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Overlay samples [selection] |
Use to overlay sample files on the plot. | ||
Plot curve / Plot points [selection] |
Select to plot points on the graph. |
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Dubinin Tabular Report Options
In the Dubinin Report Options window, highlight Dubinin Tabular Report in the Selected Reports list box, then click Edit. Column [n] indicates the column order and data contents for the report.
Log (po/p )^n. The value for [n] is the optimized exponent if Optimize exponent is selected on the Dubinin Report Options window. If not, then the value for [n] is the entered exponent value.
Dubinin Transformed Isotherm Plot Options
Highlight Transformed Isotherm in the Selected Reports list box in the Dubinin Report Options window, then click Edit.
The transformed Dubinin isotherm is the logarithm of quantity adsorbed as a function of the log of relative pressure raised to a power. Isotherms for which the Dubinin method is applicable produce straight lines when transformed in this way.
Field or Button | Description | ||
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Autoscale x-axis / Autoscale y-axis [check box] |
Select an option to have the x- and/or y-axes scaled automatically. Both axes begin at 0; the system uses the highest values collected during analysis as the ending points for axis ranges. Deselect to enter beginning and ending values manually. Autoscale x-axis. Shows the quantity of gas adsorbed at standard temperature and pressure. Autoscale y-axis. Shows the log of relative pressure. |
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Overlay samples [check box] |
Use to overlay sample files on the plot. | ||
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