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Surfer

Thermo Scientific Surfer arbeitet nach dem Prinzip der statisch-volumetrischen Gasadsorption (Physisorption und Chemisorption) unter kontrollierten Bedingungen (Temperatur, Druck) zur Charakterisierung der Mikrostruktur von porösen Festkörpern und Pulvern.

Die folgenden Eigenschaften können ermittelt werden:

Thermo Scientific Surfer ist die neueste Entwicklung auf dem Gebiet der Gasadsorption und beinhaltet einige unvergleichbare Vorteile und Eigenschaften:

Erhältlich in unterschiedlichen Ausbaustufen:

Ein neuer Gasdosage Algorithmus ermöglicht einen vollständig automatisches Geräte Setup mit den folgenden Vorgaben:

Die Ausheizstation

 

 

 
Die Software 

Neben der kompakten Gerätesoftware mit Auswertemöglichkeit und der bekannten Advanced Data Processing software ADP steht auch ein Auswertemodul für die NLDFT bereit:
 
ADP Software

Advanced data processing

Specific surface area

BET 2 parameters, BET full equation (3 parameters) with non linear regression function, Langmuir model, Dubinin-Radushkevich-Kaganer, Excess Surface Work (ESW) model, t-Plot, apha-S-Plot (Sing), MP-Plot (Mikhail-Brunauer-Bodor)

Standard isotherms for the calculation

Halsey, Fransil, Harkins-Jura, De Boer, Halenda, Lecloux, Hydroxylated silica, User defined standard

Mesopore size distribution

Barrett-Joyner-Halenda, Dollimore-Heal, Cranston-Inkley, Modelless method

Micropore size distributionwith potentials

Horvath-Kawazoe, Saito-Foley, Dubinin-Stoeckli
Available potential functions

Nitrogen – Graphite (@ 77K), Argon – Graphite (@ 77K, 87K), Carbon dioxide – Graphite (194K, 273K,298K), Argon – Zeolite (@ 87K, 77K), Nitrogen – Zeolite (@ 77K), User defined

Chemisorption

Subtraction procedure of isotherms for strong and weak chemisorptionBack extrapolation to zero pressure for metal surface and dispersion calculation Langmuir model at variable exponent

Available graphs

All calculations are applicable in graphic format. All graphs can be edited in almost all their components and exported in high resolution graphic file

Available reports

Three main reports are available: summary, standard and extended. Each report type can be manually edited by the user

NLDFT Software Module

Non Local Density Functional Theory

Main function

The solver will minimize the free energy functional  r)] with respect to (r), using the Non Local Density Functional Theory (NLDFT method in the smoothed density approximation) for the determination of micropore - mesopore size distribution The solver run on a Windows (XP) based OS machine as a standalone application

Available pore models Infinite slit and cylindrical shape
Pore size ranges

Set of pore sizes: 100 steps from 0.3 nm to 500 nm 20 steps range 0.3 nm to 1 nm , 40 steps range from 1 nm to 10 nm, 40 steps range from 10 nm to 500 nm

Parameters forintermolecular potentials

  • N2 – carbon at 77K based on a slit-pore model/ cylindrical pore model

  • N2 – silica at 77K based on a cylindrical pore model

  • Ar – silica/ carbon at 87K based on a cylindrical pore model

  • Ar – carbon at 87K based on a slit-pore model

  • CO2 – carbon at 273K based on a slit-pore model

Data display
  • Theoretical isotherm and calculated isotherm are overlaid in linear and logarithmic plot

  • Pore size distribution function in linear and logarithmic plot

Results export format
  • Direct graph printing

  • graph export in electronic format

  • copy the graph on the clipboard and paste on a document or spreadsheet

  • Data export in tabbed text file

Surfer Datenblatt