Small calorimetric studies

One of the conclusions deduced from the thermochemical cycle 2 in Table V, for instance, is that in the course of the catalytic combustion of carbon monoxide at 30°C, the most reactive surface sites of gallium-doped nickel oxide are inhibited by the reaction product, carbon dioxide. This conclusion ought to be verified directly by the calorimetric study of the reaction. Small doses of the stoichiometric reaction mixture (CO + IO2) were therefore introduced successively in the calorimetric cell of a Calvet microcalorimeter containing a freshly prepared sample of gallium-doped... 

The RC1 is an automated laboratory batch/semi-batch reactor for calorimetric studies which has proven precision. The calorimetric principle used and the physical design of the system are sound. The application of the RC1 extends from process safety assessments including calorimetric measurements, to chemical research, to process development, and to optimization. The ability of the RC1 to generate accurate and reproducible data under simulated plant scale operating conditions may result in considerably reduced testing time and fewer small scale pilot plant runs. 

Admittedly, we are not surprised that the decomposition enthalpies of styrene and 2-vinylnaphthalene peroxides are close to each other, as are those of the isomeric isopropenyl species. There is a rather rehable constant enthalpy of formation difference between phenyl and naphthyl derivatives, and as a corollary, a near-equaUty of the enthalpies of formation of 1- and 2-naphthyl derivatives, cf. the combined calculational and calorimetric studies of M. V. Roux, M. Temprado, R. Notario, S. P. Verevkin, V. N. Emel yanenko, D. E. DeMasters and J. F. Liebman, Mol. Phys., 102, 1909 (2004) and references cited therein. It is perhaps more surprising that the a-methyl group on the unsaturated moiety (vinyl -> isopropenyl) causes such a small change. 

Il in, M.M., Anokhina, M.S., Semenova, M.G., Belyakova, L.E., Polikarpov, Yu.N. (2005). Calorimetric study of the interactions between small-molecule surfactants and sodium caseinate with reference to the surface activity of their binary mixtures. Food Hydrocolloids, 19, 441-453. 

Calorimetric studies have established several general features of protein denaturation.12 13 14 For small globular proteins, the denaturation process is well represented by a two-state process,... 

Thermoporometry. Thermoporometry is the calorimetric study of the liquid-solid transformation of a capillary condensate that saturates a porous material such as a membrane. The basic principle involved is the freezing (or melting) point depression as a result of the strong curvature of the liquid-solid interface present in small pores. The thermodynamic basis of this phenomenon has been described by Brun et al. [1973] who introduced thermoporometry as a new pore structure analysis technique. It is capable of characterizing the pore size and shape. Unlike many other methods, this technique gives the actual size of the cavities instead of the size of the openings [Eyraud. 1984]. 

These results lead to fundamental questions about the nature of the intermolecular forces responsible for the complexation of the ferrocene guests. As stated before, the rather large binding constant measured between 8 (before oxidation) and host 9 " means that coulombic attraction is responsible only for a relatively small fraction of the stability of the complexes between the calixarene and the cationic guests and 2. We have postulated that these complexation phenomena constitute another example of apolar binding as defined by Diederich[19]. We have recently started calorimetric studies to measure the enthalpic and entropic changes associated with these complexation process. 

Despite certain weaknesses in this calorimetric study (side-reaction corrections, small over-all temperature changes), the AHf° value derived by Mortimer is preferred to the combustion value, for which the corrections to allow for incomplete combustion were somewhat arbitrary. The selected value is... 

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