Surface Area Software Products

DataMaster™ Software for Gas Adsorption Analyzers

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Micromeritics introduces DataMaster™, an offline Windows™-based software package, that can be used to generate classical or micropore data reductions with data collected from Micromeritics’ gas adsorption analyzers. Data reduction can be performed on computers other than the one controlling the instruments, in a remote office or other location, using data stored on a disk or network.

DataMaster performs data reduction from data obtained on the following Micromeritics Instruments:

• ASAP 2000
• ASAP 2000 Micropore
• ASAP 2020
• ASAP 2010
• ASAP 2400
• ASAP 2420
• Gemini Series with the StarDriver program
• TriStar 3000

MULTIPLE SAMPLE/GRAPH OVERLAYS
DataMaster facilitates comparing and analyzing data from different instruments. You can overlay graphs if you wish to compare graphically either the results for multiple samples or multiple types of graphs from the same sample.

HARDWARE AND SOFTWARE REQUIREMENTS

• 486DX/33 or higher computer with four megabytes of main memory and 20 megabytes of free disk space
• Windows Version 3.1x or Windows 95
• DOS Version 5.0 or later (not required for Windows 95)
• Graphics monitor (640 x 480)

REPORTS AND PLOTS AVAILABLE
DataMaster provides great flexibility in choosing reduction constants that best fit a particular application. The following data reductions are included:

• Isotherm
• BET Surface Area
• Langmuir Multipoint Surface Area
• BJH Adsorption/Desorption pore volume distribution
• t-Plot total micropore volume
• MP Method pore volume distribution
• Dubinin-Ashtakov
• Dubinin-Radushkevich,
• Horvath-Kawazoe
  

DFT^® Plus Data Reduction Package (NLDFT)

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DFT (Density Functional Theory / NLDFT) describes the gas adsorption process at the fluid-solid interface. It provides a method by which the total experimental isotherm can be utilized to determine both microporosity and mesoporosity as a continuous distribution of pore volume with respect to pore size. Conventional data reduction methods apply to particular regions of the isotherm and require transitions to other methods when moving between these regions. Since DFT (NLDFT) provides a continuous distribution, there is a smooth transition between regions and all data are used.

Micromeritics' DFT Plus software for Windows™ calculates pore volume, surface energy, and surface area distribution from the adsorption isotherms determined by Micromeritics' physisorption instruments. The calculations are based on a series of model isotherms for single pore sizes of a given geometry (shape) and provide a more accurate method of characterizing a porous material from adsorption data. By applying non-negative least squares fitting as the deconvolution technique, DFT Plus determines the most appropriate subset of model isotherms which, when summed, best fits the experimental isotherm. Models are generated by both statistical thermodynamics using DFT (NLDFT), and classical theories such as the Kelvin equation with various thickness curves. The separate Models Library included with DFT Plus can be easily updated as new models become available.

To use DFT Plus, simply specify a data file to be processed; then select one of four standard regularization coefficients for the desired degree of smoothing or enter one of your own. Then select an appropriate pore model for the sample data file being processed. Results are presented in both graphic and tabular form either to a monitor or a printer, or exported as an ASCII file.

For more information on the development of DFT, follow this link -
A Brief History of Density Functional Theory Applied to Extracting Information from the Physical Adsorption Isotherm   Link to DFT Bibliography