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Surface Area Analyzers

Nova Gas Sorption Analyzer- Operation

Simple operation and fast analysis

Operation
Superior engineering delivers years of trouble-free surface area analysis and pore size measurement. All process control features are self-contained, enabling the instrument to function independently without operator intervention or external computer support.

Critical Components

tri_top.gif (143 bytes)High sensitivity pressure transducer
tri_top.gif (143 bytes)High resolution 16-bit or 24-bits A/D converter
tri_top.gif (143 bytes)Robust dewar elevator
tri_top.gif (143 bytes)Filter gaskets to prevent vacuum system contamination by powdered samples
tri_top.gif (143 bytes)Reliable solenoid valves and leak-free (10-9 cc/sec) dosing manifold
tri_top.gif (143 bytes)Precision coolant level control
Sample Preparation
Each NOVA offers up to four built-in, microprocessor-controlled degassing stations with independent flow rate selection for each station. Depending on the model, sample preparation may be performed under vacuum or flow conditions with temperature selection or programmable profile setting from ambient to 450°C.

Results

box-s.GIF (53 bytes)Single- and multi-point B.E.T. surface area with Y-intercept, "C" constant, slope and correlation coefficient.

box-s.GIF (53 bytes)Adsorption and desorption isotherms.

box-s.GIF (53 bytes)B.J.H. pore size distribution calculated from the adsorption or desorption isotherm.

box-s.GIF (53 bytes)Total pore volume.

box-s.GIF (53 bytes)Sample density.

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Results with NOVAWin™ or TouchWin software

tri.GIF (143 bytes)Isotherms: User-selectable number of data points at any desired target pressures
tri.GIF (143 bytes)BET Surface Area: Single point, multi-point, slope, intercept, "C" constant, correlation coefficient, tabular and graphic format
tri.GIF (143 bytes)Langmuir Surface Area: Multi-point, slope, intercept, correlation coefficient, tabular and graphic format
tri.GIF (143 bytes)BJH Pore Size Distribution: Volume, area, adsorption, desorption, cumulative, derivative (linear and logarithmic), interpolated, tabular and graphic format
tri.GIF (143 bytes)Dollimore-Heal Pore Size Distribution Volume, area, adsorption, desorption, cumulative, derivative Distribution (linear and logarithmic), tabular and graphic format
tri.GIF (143 bytes)Dubinin-Radushkevich
Micro Pore Area:
Slope, intercept, correlation coefficient, average pore size, micropore volume, average adsorption energy, tabular and graphic format
tri.GIF (143 bytes)Total Pore Volume: At user-selectable P/P0
tri.GIF (143 bytes)Average Pore Size: Radius, diameter
tri.GIF (143 bytes)Statistical Thickness: de Boer, Halsey or Carbon Black models
tri.GIF (143 bytes)t-Method: Micropore area, mesopore area, micropore volume, correlation coefficient, tabular and graphic format
tri.GIF (143 bytes)Quenched-solid and Non-local Density Functional Theory methods (QSDFT and NLDFT):

Large library of "kernels" for nitrogen, argon and carbon dioxide adsorbates, in different pore geometries such as cylinders, slits and spheres, at different temperatues from 77K to 273K.

tri.GIF (143 bytes)Other Pore Size Models: MP, Horvath-Kawazoe (HK), Dubinia-Astakhov (DA), Saito-Foley (SF), tabular and graphic format.
tri.GIF (143 bytes)GCMC Method: CO2 - carbon at 273K based on a slit-pore model
tri.GIF (143 bytes)Fractal Dimensions: Neimark-Kiselev (NK), Frenkel-Halsey-Hill (FHH)