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POROCheck Software for Dynamic Pore Size Determination 

  
Chromatographical Analysis under Real Conditions

The stand-alone, easy-to-use, porosimetry software POROCheck uses standard chromatographic equipment to investigate porous structures without relying on specialized and high-priced instruments or requiring toxic substances. The software runs on any Win32 operating system and makes pasting results into own reports really easy (using the Windows clipboard intelligently). Both graphical and numerical results and data tables can be copied to any Windows application.

     P/N

PoroCheck software for pore size analysis

400-9001

PoroCheck software and pullulan standards kit

400-9005

PoroCheck software and poly(styrene) standards kit

400-9002

PoroCheck starter kit aqueous (PoroCheck, column, Pullulan standards)

400-9004

PoroCheck starter kit organic (PoroCheck, column, PS standards)

400-9003

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Experimental Principle: 

PSS PoroCheck uses recognition of porous structures by diffusion of test molecules of different size into the pores under the normal operating conditions of the porous material (not in a vacuum). This means that PoroCheck can also measure fragile samples and investigate materials in various states (dry, swollen, partially adsorbed).

Chromatographic porosimetry relates sample retention to pore size using the chromatographic separation theory developed by Cassasa and Gorbunov.  The analysis requires a conventional LC instrument.  Running an LC instrument is straight-forward to most users who would not require additional training as would be the case with a gas adsorption or Hg intrusion device.

All results are retrieved from a table relating molecular size to chromatographic retention. The pore size distribution is calculated based on a flexible chain model assuming fixed pore boundaries. Cylinder and slit models are available to describe the pore structure.

Detailed analysis of pore accessibility yields a multitude of analytical results, which can be derived from the pore size distribution. Results can be presented in many ways (differential or cumulative representation, volume or surface distribution).

PoroCheck is the first and only software which calculates error margins for 50 
and 95% accuracy.



Click picture for close up view

Results
results Pore size distribution

Numerical and Graphic 

PSS PoroCheck retrieves many results from the detailed analysis of the pore size distribution (PSD). PoroCheck also estimates the potential errors based on an in-depth statistical analysis of the experimental raw data. It is the only pore analysis software which has this capability. 

Pore size results
    * complete pore size distribution (surface and volume based)
    * average pore diameter
    * width of the pore size distribution
    * reduced PSD width
    * optimum molecular size range 

Pore volume/surface results
    * pore volume
    * specific surface area 

Molecular parameters
    * optimum guest molecule size
    * optimum guest molecule molar mass
    * highest guest molecule selectivity
    * optimum molar mass range 

PoroCheck Advantages
    * easy to learn and run

    * uses existing instrumentation
    * immediate return on investment
    * measures porous materials in their native state
    * also good for fragile samples or in swollen state
    * includes dynamics of pore accessability
    * wide dinamic range of pore size range (5Å to over  6.000 Å)
    * only measures accessible pores, no bottleneck pores
    * multitude of numerical and graphical results
    * fast and accurate results
    * no need for special equipment
    * no toxic or expensive chemicals
    * minimal operational cost  
PoroCheck Applicability
    * chromatography media

    * drug delivery systems
    * ion-exchange resins
    * catalysts and catalyst supports
    * ceramics
    * nano-materials
    * molecular recognition
    * adsorbents
    * solid-state synthesis supports (Merrifield etc)
    * high-throughput screening carriers
    * bio-reactors 

Bibliography
  1. A.A. Gorbunov, L. Y. Solovyova, and V.A. Pasechnik, J.Chromatogr., 448, 307 (1988)
  2.  A.A. Gorbunov, A.M. Skvortsov, Polymer, 32, 3001 (1991)
  3.  E.F. Casassa, J. Polym. Sci., Part B, 5, 773 (1967)
  4.  E.F.Casassa, Macromolecules, 9, 182 (1976)
Implementation and application:
  1. C. Dauwe, S. Marme, GIT Laboratory Journal, 3, page 106 (2002) (english)
  2. C. Dauwe, P. Kilz, CLB, 52, page 60 (2001) (german). 

POROCheck features and benefits in comparison to Nitrogen Adsorption and Mercury Intrusion Methods

Criteria PSS POROCheck™ N2 Adsorption Hg Intrusion
Time requirement 1 to 4 hours 1 day >2 hours
Sample preparation low to medium medium low
Training time low medium medium
Investment cost low high medium
maintenance cost low high medium
startup and operation cost low high medium
Analysis of open pores all pores (in vacuum) all open pores (high pressure)
Type of experiment dynamic static static
Pore types open, accessible open and closed open incl. bottlenecks
Pore size range 5 to > 6 000 Å 4 to 400 Å 35 to 3 000 000 Å

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