| Adsorptive | Boiling point T / K | ρLiquid / g cm-3 | Critical diameter of atom/molecule / nm /3/ | am for BET surface from ρLiquid *4 / nm2 | p0 / kPa | Non-ideality factor Fni of the adsorptive *3 |
Ar | 87 | 1.39 | 0.34 | 0.143 | 101 | 4.27·10-5 |
Kr | 120 | 2.41 | 0.36 | 0.163 | 101 | 3.83·10-5 |
Xe | 165 | 2.94 | 0.41 | 0.192 | 101 | 3.71·10-5 |
SF6 | 209 | 1.91 | 0.67 | 0.276 | 101 | 3.87·10-5 |
CH4 | 112 | 0.42 | 0.40 | 0.174 | 101 | 4.26·10-5 |
Ethane | 184 | 0.54 | 0.44 | 0.223 | 101 | 3.86·10-5 |
Propane | 231 | 0.58 | 0.49 | 0.275 | 101 | 3.93·10-5 |
n-Butane | 273 | 0.60 | 0.49 | 0.322 | 101 | 4.05·10-5 |
| O2 | 90 | 1.14 | 0.28 | 0.141 | 101 | 4.09·10-5 |
N2 | 77 | 0.81 | 0.30 | 0.162 | 101 | 5.21·10-5 |
| CO2 | 195*1 | 1.26 | 0.28 | 0.164*2 | 188*2 | 2.09·10-5 |
| Ethene | 196 | 0.58 | 0.39 | 0.203 | 101 | 3.71·10-5 |
| CO | 82 | 0.94 | 0.37 | 0.147 | 101 | 5.11·10-5 |
| NH3 | 240 | 0.70 | 0.29 | 0.128 | 101 | 4.17·10-5 |
| iso-Butane | 261 | 0.59 | 0.51 | 0.325 | 101 | 1.71·10-5 |
3P Instruments
cryoTune series
Gas Sorption Analyser
- Temperature Range 77 K – 323 K
- Easy-to-use software
- Up to 3 devices can be controlled at once
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Technical Specs
- Temperature range 77 K – 323 K
- Temperature stability ± 0,004 K (standard deviation)
- Easy-to-use software for data acquisition, display, analysis and archiving
- Up to three cryoTune devices can be controlled by the software via a single USB port
- The universal cryoTune can be used with any commercial gas sorption device that accepts external temperature control for sorption measurements
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Absorptives
*1…sublimation point
*2…p0 and ρLiquid of the undercooled liquid
*3…mean value from van der Waals- und Bethelot equations
*4…calculated according to:
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Applications
CO2 Absorption Study
Porous Materials
Micropore Absorption
Surface & Pore Structure
Ultra-micropores
Adsoptives
Micropores
Isotherms
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Techniques
Gas Adsorption
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Models
Although a cryoTune can work as stand-alone without a PC, it is delivered with software that can display and record the real time temperature. The cryoTune series consists of three versions, which can be purchased individually or as a package. All models are connected to a measuring station of your sorption device. If you have a multi-station device in use, it is possible to connect several cryoTunes.
The cryoTune 77 is an option for sorption experiments at 77.35 – 78 K with a temperature control accuracy of better than 0.004 K for realizing temperature-stable, isothermal measurements with nitrogen and other gases. Particularly useful for krypton, argon or methane when saturation vapor pressure cannot be measured during measurement and accordingly cannot be corrected. The cryoTune 77 significantly increases measurement accuracy and reproducibility of measurements close to 77 K, due to the exact temperature control no p0 correction is necessary.
The cryoTune 87 covers the temperature range 82 – 135 K, making the cryoTune 87 the standard option for Ar 87 K measurements for surface and pore analysis recommended in ISO 9277 and IUPAC recommendation of 2015.
The cryoTune 195 is the cryoTune version for isotherm measurements in the range of 180 – 323 K. This allows CO2 measurements in particular, but also measurements of other adsorptives such as ethane or propane at their boiling temperatures. For such measurements you neither need a refrigeration thermostat, nor a dry ice refrigeration mixture nor a double-walled additional Dewar. Among others, the cryoTune 195 enables the following CO2 measurement possibilities:
- CO2 adsorption at 273 K
- CO2 adsorption at 195 K up to a relative pressure of ca. p/p0= 0.5 (the entire micropore filling including the BET range can be detected, e.g. for ultra-micropores, where N2 at 77 K is not applicable)
- Measurement of isotherm sets at different temperatures for thermodynamic evaluations, e.g. in the ranges around 273 K or 195 K or over the entire temperature range
The cryoTune 120 completes the cryoTune series and enables long-term measurements especially in the range 115 K (boiling temperature of krypton) over 165 K (boiling temperature of xenon) up to 230 K. The combination cryoTune 87 and 120 thus allows the use of three noble gases at their boiling temperature: Argon 87 K, Krypton 120 K and Xenon 165 K, as well as a multitude of other measurement possibilities with Ar, O2, methane, ethane or propane.
