The cryoTune is a compact and cost effective cryostatic accessory designed to provide precise temperature control (±0.004 K) at temperatures in the range 83 – 135 K. The cryoTune is ideally suited to enable 3P micro 300 and other physisorption analyzers to generate fast and IUPAC-recommended micropore analyses using argon (Ar) gas at 87 K and liquid nitrogen as the cryogen.
With this compact and deceptively simple accessory, modern gas sorption analyzers can be used to generate isotherms:
It is now well established (see the latest IUPAC recommendations /1/) that argon molecules provide distinct advantages over nitrogen molecules for gas sorption analyses, including the following:
There has been a long-felt need in the art for the means to enable Ar @87 K experiments without having to resort to using compressor-based cryostats (which can be very expensive) or liquid argon cryogen (which can also be relatively expensive or even unavailable in some regions). The cryoTune fills this need by providing a compact accessory which is easily adaptable to modern gas sorption analyzers. With the cryoTune users can easily perform IUPAC-recommended argon sorption analyses at 87.3K using liquid nitrogen (instead of liquid argon) as the cryogen.
/1/ IUPAC recommendation: M. Thommes, K. Kaneko, A.V. Neimark, J.P. Olivier, F. Rodriguez Reinoso, J. Rouquerol and K.S.W Sing, Pure Appl. Chem. 87 (9-10), 1051-1069 (2015); pdf-Download
/2/ D. Klank, PARTICLE WORLD 19, “Why do we measure surfaces and pores with argon and krypton gas adsorption much more often in future?” p. 26 – 29
/3/ ISO 9277:2010: Determination of the specific surface area of solids by gas adsorption – BET method
/4/ Fröba et al., Partikelwelt 17, “Die Charakterisierung von porösen Hybrid- und Funktionsmaterialien im Rahmen der „Energieproblematik”” p. 17 ff. [available only in German]
/5/ D. Klank, C. Reichenbach, Chem. Ing. Tech., 2019, 91 (7), 934 – 935, https://doi.org/10.1002/cite.201970071 [available only in German]
/6/ D. Klank, C. Reichenbach, C. Lüttmann, Laborpraxis, August 2019, 30 – 32, https://www.laborpraxis.vogel.de/ist-die-bet-methode-zu-oberflaechlich-a-852355/ [available only in German]
/7/ C. Reichenbach, D. Klank, Chem. Ing. Tech. 2019, 91 (11), 1504–1505, https://doi.org/10.1002/cite.201971101 [available only in German]