Being a reliable analysis method for the determination of caloric effects, power compensated differential scanning calorimetry (DSC) was applied to determine the heat of reaction of hydrothermal carbonization (HTC
Authors:Sergio I. Martínez-Monteagudo, Marleny D. A. Saldaña, and John J. Kennelly
to its complexity. As the oxidation proceeds, several reactions occur simultaneously at different rates. These reactions release heat that can be measured using differential scanning calorimetry (DSC). Recording the heat released from a particular
Authors:Christelle Herman, Tom Leyssens, Valérie Vermylen, Véronique Halloin, and Benoît Haut
with metastable forms [ 2 ].
Differential Scanning Calorimetry (DSC) is commonly used to evaluate most of the thermal properties of solid states, such as melting temperatures and enthalpies or specific heat capacities [ 3 ]. Whilst recent
This personal review focuses on two aspects. First, glass transition dynamics and hence also calorimetry is connected to dynamic
heterogeneity. This results in an interplay of the corresponding dynamic length scales and length scales from structural heterogeneities
in polymeric samples. Second, the complexity of the dynamic glass transition itself results in different effects of this interplay
for different experimental observables. Hence the comparison of results from calorimetry with other relaxation methods gives
important clues to an understanding of the complex glass transition phenomenon.
October 2–5, 2005 Congress Center ACADEMIA
Star Lesn, Slovak Republic
Editor: Peter Šimon
Slovak Group of Thermal Analysis and Calorimetry Slovak Society of Chemistry
Faculty of Technology and Food Technology, Slovak University of Technology
Slovak Silicate Society
Authors:Hengzhong Zhang, Pinming Zhang, and Zheng Fang
The mathematical-physical equation concerning the process of calorimetry of electrode reactions was deduced, and the corresponding
solutions were obtained respectively for the period of the electrochemical polarization and that of the natural cooling. The
calorimetry of the anodic oxidation of ferrocyanide to ferricyanide under linear sweep-current polarization was carried out,
the obtained apparent enthalpy change of the electrode reaction agreed well with that obtained by the calorimetry with constant
currents. The developed calorimetry with linear sweep-current and the data processing method are applicable for quick determination
of apparent enthalpy changes of electrode reactions.
Reading and co-workers introduced a new technique a few years ago called Modulated Differential Scanning Calorimetry or MDSC.
Here the first part of a theoretical analysis for this technique is given. A simple mathematical model for modulated differential
scanning calorimetry in the form of an ordinary differential equation is derived. The model is analysed to find the effect
of a kinetic event in the form of a chemical reaction. Some possible sources of error are discussed. A more sophisticated
version of the model allowing for spatial variation in a calorimeter is developed and it is seen how it can be reduced to
the earlier model. Some preliminary work on a phase change is also presented.
This article is a review of some of the results we have obtained by studying various kinds of emulsions using techniques from
the simplest one, a home-made differential thermal analysis to elaborated ones such as differential scanning calorimetry commercial
devices. These techniques were used not only to determine energetic values but also essentially to show and quantify physical
chemical phenomena such as undercooling, freezing, melting, mass transfer between droplets and solid formation involved in
Semi-batch reactors are widely spread in the fine chemicals and specialties industry. The reason is that, compared to the
pure batch operation, the feed of at least one of the reactants provides an additional way of controlling the reaction course,
which represents a safety factor and increases the constancy of the product quality. Process temperature and feed rate can
be optimized to satisfy safety constraints, i.e. cooling capacity and allowable accumulation. An economically better way of
operating a semi-batch reactor is to adapt the feed rate to the allowed accumulation of reactants. An experimental method
based on calorimetry will be presented and illustrated by an example.