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 – 125 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 in Pure. Appl. Chem. 87 (2015) 1051)) 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-Empfehlung: 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]