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... To Particle Characterisation

CryoSync

Enabling Cost-Effective IUPAC-Recommended Argon Sorption Analyses at 87.3 K


The CryoSync is a deceptively simple device entirely developed by Quantachrome Instruments
(patent pending). This amazingly powerful and affordable cryocooling accessory allows users of Autosorb iQ analyzers and other suitable gas sorption instruments to fulfil the IUPAC recommendations to analyse microporous material using argon rather than nitrogen gas.

Benefits

  • Highly precise isothermal analyses without the need to compensate for Po changes or for dedicated Po measurements
  • Significant cost savings in locations where liquid Argon is expensive or even not available
  • Enables heats of adsorption measurements
  • Fewer accessories needed – no LAr dewars or temperature sensors
  • Suitable for extended micropore analyses

Features

  • Performs analyses at liquid argon temperature (87.3 K) using liquid nitrogen (77.4 K)
  • Temperature stability as precise as ± 0.005 K (std. dev.)
  • Analysis duration greater than 50 hours without optional refill
  • Wide temperature range (82-100 K)

Autosorb iQ model with CryoSync Accessory

Autosorb iQ model with CryoSync Accessory

IUPAC Recommendation

Argon, unlike nitrogen, has no quadrupole moment. Therefore, its molecules do not tend to orient or pack themselves in special ways in response to interactions with polar surface sites (ions, functional groups, etc.). This means that argon isotherms are sensitive only to surface physical and pore structural features, and not its surface chemistry.

At 87.3 K (liquid argon temperature), experimental conditions are ideal for obtaining full adsorption/desorption isotherms that can be more directly and unambiguously correlated with surface and pore structural features.

IUPAC Technical Report 2015

Published in Pure and Applied Chemistry Volume 87, Issue 9-10 - Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution
“The choice of adsorptive is crucial in the characterisation of porous materials. Nitrogen at 77 K has been widely used, but the interpretation of the isotherm data is not always straightforward. For various reasons, argon adsorption at 87 K is considered to be more reliable and is now recommended – particularly for micropore size analysis”

 


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CryoSync

CryoSync Cryocooling Accessory

For more information contact us.