Adsorptive Properties

Adsorptive properties provide the adsorptive (analysis gas) characteristics for the analysis.

Adsorptive Properties
Selections Description
Adsorptive [drop‑down box] Name of the adsorptive gas whose properties are being defined.

Estimate mass flow constant and thermal conductivity [group box]

Select if a gas blend will be used for the estimated Relative Thermal Conductivity and Mass Flow Constant. Select the gases to be used in the blend.

Gas blend. [check box] Select to specify a preblended mixture of a chemically insert gas and a chemically active gas. The blend's Mass Flow Constant and Relative Thermal Conductivity are automatically calculated from those for the two gases in the blend.

Fluid properties [button] Use to import parameters from a Fluid Properties (.FPI) file. Changing fluid properties should only be necessary if an adsorptive is to be used for which no adsorptive properties are provided. Contact Micromeritics Scientific Services if new fluid properties are required.
Hard-sphere diameter [text box]

Estimate of the molecular size used in calculating the thermal transpiration correction.

Mass flow constant [text box] Scaling factor for the Mass Flow Controller measured flow rate. Applicable only for the gas used in the flow prep tasks. The default is preset for gases provided with the application.
Mnemonic [text box] Enter the mnemonic name for the adsorptive.
Molecular cross-sectional area [text box] The area that a single adsorbed molecule occupies on the surface of the sample. It is used in surface area calculations.
Molecular weight [text box] The molecular mass is used for the weight % column of the isotherm tabular report and the pressure composition isotherm plot.
Relative thermal conductivity[text box]

Enter the thermal conductivity relative to Air.

Vapor [check box]

Select if vapor is going to be used and enter the vapor defaults.

High-resolution fluid properties. Use to import parameters from a Fluid Properties (.FPI) file. Changing fluid properties should only be necessary if an adsorptive is to be used for which no adsorptive properties are provided. Contact Micromeritics Scientific Services if new fluid properties are required.

Antoine equation. Enter the Antoine constants.

  • A, B, C. Enter the Antoine constants used in the vapor TCD calibration.
  • Min/Max temperature. Enter the temperature range where the constants are valid.
  For fields and buttons not listed in this table, see Common Fields and Buttons.