Page 283 - Gas Adsorption Equilibria

5. Oscillometry 269

measurements of binary sorptive gas mixtures with non-isomeric components
in a swelling sorbent material without the need to analyze the gas phase in
sorption equilibrium, i. e. without needing a gas chromatograph or a mass
spectrometer. As we have been prepared to start measurements of this type
early in 2002 at IFT, University of Siegen, we are sorry to say that we have
not been able to actually realize them due to the lack of man power and time.

Figure 5.16. Scheme of an instrument for manometric-gravimetric-oscillometric measurements
of binary coadsorption equilibria in swelling materials (polymers, resins etc.)
without sorptive gas analysis by GC or MS.

Finally we want to advise the reader interested in oscillometric
measurements of masses to consider design and experiments with a training
instrument operating either at ambient air conditions or being included in a
glass or plexiglass cover allowing really to observe rotational oscillations of
*)
the pendulum. Photographs of such an instrument used in our laboratories
during 1996-98 are given in Figures 5.17, 5.18 below.

The training instrument allows one to study effects of changes in sizes and
masses of the disk and the wire of the pendulum. Results of these experiments
often can be described by few dimensionless numbers characterizing the
pendulum and provide a good starting point for proper design of a pendulum
for scientific or industrial measurements [5.2, 5.7].

*)
As a first step, studying the famous clock “Atmos”, manufactured by Jaeger-LeCoultre,
Geneva, Switzerland, is highly recommended.