Thermic detectors are seldom used in analytical laboratories, in spite of their advantageous properties. Their theoretical
basis provides simple relations and useful equations for the design and construction of thermic liquid analyzers. In this
paper a home-made detector system was used for the continuous determination of hydrochloric acid. The results were in accordance
with the theoretical considerations.
Authors:Taís Vanessa Gabbay Alves, Eraldo José Madureira Tavares, Fauze Ahmad Aouada, Charles Alberto Brito Negrão, Marcos Enê Chaves Oliveira, Anivaldo Pereira Duarte Júnior, Carlos Emmerson Ferreira da Costa, José Otávio Carréra Silva Júnior, and Roseane Maria Ribeiro Costa
degradation of polymers takes place through mechanical distortion, cracking, fissures, and so forth [ 8 ].
The hydrogels events of mass loss generally result from the water loss and/or solvents and posteriorly from their thermic or oxidative
Authors:Tuong Van Le Doan, Petr Stavárek, and Claude de Bellefon
A methodology that may be applied to help in the choice of a continuous reactor is proposed. In this methodology, the chemistry is first described through the use of eight simple criteria (rate, thermicity, deactivation, solubility, conversion, selectivity, viscosity, and catalyst). Then, each reactor type is also analyzed from their capability to answer each of these criteria. A final score is presented using “spider diagrams.” Lower surfaces indicate the best reactor choice. The methodology is exemplified with a model substrate nitrobenzene and a target pharmaceutical intermediate, N-methyl-4-nitrobenzenemethanesulphonamide, and for three different continuous reactors, i.e., stirred tank, fixed bed, and an advanced microstructured reactor. Comparison with the traditional batch reactor is also provided.
small number of publications are collected in this Special Chapter of the
J. Therm. Anal. Cal. All these publications of the Special Chapter are related
to scientific areas, which are presented and discussed at our International
Conferences on Pharmacy and Applied Physical Chemistry. Of course, the publications
collected here are only some typical highlights compared with the scientific
program of the PhandTA 8, Monte Verit, 2004 with 50 oral contributions
and 25 poster presentations. A rather complete overview of the scientific
program was presented in J. Therm. Anal. Cal., 57, 1999. The latter volume
represents a considerable part of the contributions given at the PhandTA 3,
held in 1997 at the Centro Stefano Fanscini at Monte Verit, Ascona,
Switzerland. The scientific program is the essential part of our Conferences,
however, the conference site at Monte Verit is by its history, by
the site on top of a hill situated in a wonderful park, overlooking Ascona
and the Lago Maggiore a rather ideal place for the conferences of our anticipated
quality. The PhandTA conferences were three times held at Monte Verit.
The next one, the PhandTA 9 will be held on September 10 to 13, 2006 at the
“Institut fr Pharmazeutische Technology und Biopharmazie”,
University of Dsseldorf, Germany. The 10th
anniversary, namely the PhandTA 10, will be held from Sunday 21st
to Wednesday 24th of October, 2007.
This anniversary meeting will also express our activities over a period of
15 years since the foundation of the European Society for Applied Physical
Chemistry in 1992.
With both of these Conferences we plan to create
a Special Chapter in the JTAC.
I extend on behave of the members
of the board of eurostar-science an invitation to the members of our society
and to our scientific friends to participate in the two forthcoming PhandTA’s.
Additionally, all possible participants should consider a publication of the
presented scientific work in cooperation with the members of the board and
the editors of this journal.
Cordially, Erwin E. Marti President
of the European Society for Applied Physical Chemistry
Authors:Nicolina Pop, Gabriela Vlase, T. Vlase, N. Doca, A. Mogoş, and A. Ioiţescu
By kinetics of decomposition of solids in both isothermal and non-isothermal conditions, the compensation effect (CE) is rather
The topic of this work is to suggest an activation mechanism which leads to the dependences similar with CE.
The solid is assimilated to a system of the harmonic oscillator with a Bose-Einstein energy distribution.
Considering an activation process due to a vibrational energy transfer from a homogeneous and isotropic field of thermic oscillators
to the solid-state oscillator, the thermodynamic functions are in the relationship
where ΔH* and ΔS* are the activation functions and Tis is the isokinetic temperature.
Taking into account the definitions of H and S by means of the partition function, the isokinetic temperature is assimilated with the characteristic temperature
An important consequence, a correlation between the isokinetic temperature and the spectroscopic wavenumber of the activated
bond, is illustrated by a number of decomposition reactions under non-isothermal conditions.
Authors:B. Liu, P. Thomas, A. Ray, R. Williams, and S. Donne
The thermal decomposition of electrolytic
manganese dioxide (EMD), in an inert atmosphere, and the effect of chemical
reduction on EMD, using 2-propanol under reflux (82C), was investigated
by differential scanning calorimetry (DSC). This study is an extension of
a study investigating the thermal decomposition of EMD and reduced EMD by
TG-MS (J. Therm. Anal. Cal., 80 (2005)625)). The DSC characterisation was
carried out up to 600C encompassing the water loss region up to 390C
and the first thermal reduction step. Water removal was observed in two distinct
endothermic peaks (which were not deconvolved in the TG-MS) associated with
the removal of bound water. For the lower degrees of chemical reduction, thermal
reduction resulted in the formation of Mn2O3;
for higher degrees of chemical reduction, the thermal reduction resulted in
Mn3O4 at 600C. In the DSC
the thermal reduction of the EMD and chemically reduced specimen was observed
to be endothermic. The reduced specimens, however, also showed an exothermic