t-Plot Report
The t-Plot calculation allows quantitative analysis of the area and total volume ascribed to micropores. Matrix area (the area external to micropores) is directly determined and often proves to be a valuable way of characterizing complex mixed materials.
Field or Button | Description | ||
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Fitted thickness range [text box] | Enter the minimum and maximum thicknesses (in angstroms or nanometers) to include in the thickness curve. Go to Options > Units to specify default units. | ||
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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Selected Reports [group box] |
Tabular Report. Use to have a tabular report of data generated. t-Plot. Use to have a graphical representation of data generated.
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Surface area correction factor [text box] | Enter the value to correct for surface areas that are not smooth. This brings the values for BET surface area and micropore surface area into accordance. For most samples, the default value of 1.000 is adequate. | ||
Surface Area [group box] |
Select the surface area value used for thickness calculations. BET is the most commonly used option. | ||
Thickness Curve [group box] |
Select the thickness curve, then click Edit to modify the values in the equation for the selected curve. The Frenkel-Halsey-Hill thickness curve can be applied using the Halsey option. Kruk-Jaroniec-Sayari / Halsey / Harkins and Jura / Broekhoff-de Boer / Carbon Black STSA. Select the thickness curve option, then click Edit. Modify the equation for the selected curve as needed. Reference. Select Reference, then click Edit to define a t-curve by entering both the relative pressure and thickness values. One predefined curve is shipped with the analysis program and is found in the Reference directory.
To import values from an existing thickness curve (.THK file), click Open, then select the file containing the values. The table to be imported must have a .TXT or .THK file extension and have a two-column format with the relative pressures in the first column and the thickness values in the second column. Columns must be separated by a space or a tab. |
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t-Plot [check box] |
Use to have a graphical representation of data generated. Autoscale x-axis. The x-axis field shows the statistical thickness of the adsorbed film. Autoscale y-axis. The y-axis field shows the quantity of gas adsorbed. Overlay samples. Use to overlay sample files on the t-plot. |
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