Authors:P. Llewellyn, N. Pellenq, Y. Grillet, F. Rouquerol, and J. Rouquerol
Water adsorption at temperatures of 286 and 296 K on silicalite-I, ZSM-5 (Si/Al=16), ZSM-48 (Si/Al=50) and AlPO4-5 is followed by gravimetry with a quasi-equilibrium continuous adsorptive introduction.
The results show that all of these samples are characterized by a continuous distribution of strongly energetic water adsorption
sites (from 60 to 120 kJ·mol−1) for which the adsorption is irreversible at the experimental temperature. This probably justifies the presence of hysteresis
on desorption at very low relative pressure values. Adsorption of water in these systems firstly occurs by site. This is then
followed by cluster formation and it is suggested that it is the ability of the adsorbent to build up these clusters within
the microporous structure which determines intracrystalline uptake. It is put forward that the zeolites, silicalite-I and
ZSM-5, do not accommodate cluster formation within its microporous network. However, an external flexible microporous structure,
containing Lewis sites, may be present for large crystals. This flexible secondary structure may then be able to opened (swelled)
at high relative pressures.
On the other hand, for the aluminophosphate AlPO4-5, it is believed that a change in the aluminium coordination on the formation of a crystal hydrate together with capillary
condensation results in a large step in the adsorption isotherm, which is itself preceded by a smaller step, revealing a brutal
densification of the adsorbed phase.
The kinetics of thermal decomposition of a series of uranyl nitrate complexes with N-alkylcaprolactams (alkyl=C2H5, C4H9, C6H13, C8H17, C10H21 or C12H25) was studied by means of non-isothermal gravimetry under a nitrogen atmosphere. From the TG-DTG curves, the kinetic parameters
relating to the loss of two molecules of coordinated ligand were obtained by employing two groups of methods: (I) a group
of conventional methods involving the Coast-Redfern, Freeman-Carroll, Horowitz-Metzger, Dharwadkar-Karkhanavala and Doyle
(modified by Zsakó) equations; (II) a new method were suggested by J. Máleket al.. The results obtained using two types of methods were compared, and it emerged that the results of method II were much more
meaningful and reasonable in this work. Additionally, the effects of the molecular structure of the ligands on the kinetic
data and models were studied and are discussed.
Authors:E. Fiani, L. Perier-Camby, G. Thomas, and M. Sanalan
Adsorption isotherms of n-butane on a granulated activated carbon were measured by two different but complementary experimental
methods: calorimetry and gravimetry. Adsorption heats were determined in different ways. For the system studied, the experimental
results prove that the adsorbent offers a homogeneous site distribution. Besides, there can be differences between the adsorption
heat values which might come from the way they are obtained (by calculation or direct measurements).
The amorphous content of different Desferal samples was quantified by recording its recrystallization using isothermal microcalorimetry in a static as well as in a flowing humid atmosphere. Furthermore water vapor sorption gravimetry was performed for the same purpose. These analytical methods result in a quantitative signal directly dependent on the content of the amorphous phase (recrystallization, water sorption equilibrium). Their sensitivity allows the detection of amorphous content below 1%. Methods are compared and advantages and disadvantages are discussed.
Jäntti published in 1970 a method to obtain equilibrium values at an early stage of gravimetric sorption measurements. In
former papers the authors criticised and extended that method. In the present work we discuss problems of its applicability
on practical measurements.
The interaction between samples of metallic zinc and water vapour was studied gravimetrically, both in the absence and in
the presence of oxygen. The experimental total mass gain vs. time curves exhibited two plateaus, whose heights increased with,
elevations both of relative humidity and of temperature. The amount of product retained on the surface after desorption was
also determined as a function of time. The product was identified as hydrated zinc oxide. In the runs conducted without oxygen,
the retained product curves displayed a time delay with respect to the total mass gain curves. In the presence of oxygen,
however, there was practically only one chronogravimetric curve. This behaviour is interpreted on the basis of a common mechanism
involving the formation of an intermediate precursor oxide, which is more readily formed in the presence of oxygen than in
its absence. A set of mathematical equations was derived, from which the rate constants for both processes were obtained.
The second step was ascribed to a further weak adsorption of water.
can be used to calculate the unknown torque T and to relate the other quantities in the equation to the actual instrument-constants. In this way, balance reading could be much faster and weighing errors due to faulty instrument and environmental influences can be smaller than those in equilibrium position. This enables the use of microbalances for the observation of fast chemical or thermal processes and to use it as fast checkweigher for control of sorting machines. In the present paper we present results from calculations of a simulation procedure.
We will review the application of acoustic wave mass sensors in chemical and biological sensing with focus on quartz crystal microbalance and surface acoustic wave devices. In chemical sensing, it is unlikely that a single sensor will display a selective and reversible response to a given analyte in a mixture. Alternative strategies such as use of sensor arrays and sampling devices will be discussed to improve performance. We will also discuss applications of quartz crystal microbalance as biosensor in the liquid phase.
Authors:E. Robens, D. Möhlmann, R. Staudt, Th. Gast, and M. Eger
European and American Missions to Mars will be focussed on the search for
life, and of water, as a precondition for the existence of complex organisms.
Besides the polar ice caps of carbon dioxide and water, in the upper few meters
of the Martian surface, water and ice bound to the soil surface, is expected.
Therefore we propose to investigate the storing capability of Martian soil
in situ. This planned quite new type of investigation makes use for the first
time of a balance at a celestial body outside Earth.