93 research outputs found
Thermal analysis of some alfa-Amino Acids using simultaneous TG-DSC apparatus. The use of dynamic thermogravimetry to study the chemical kinetics of solid state decomposition.
Excess molar isobaric heat capacities and excess molar enthalpies for water-DMSO mixtures at 25 °C.
Study of the proton transfer processes of nitrophenols to nitrobenzoic acids and to benzoic acid in water-dimethylsulfoxide mixtures compared with the same process in the gaseous phase.
A study of the proton transfer processes from the nitrophenols to nitrobenzoic acids in water-DMSO mixtures compared with the processes in the gaseous phase is presented. By means of two thermodynamic cycles which refer to a gaseous initial thermodynamic state, it has been possible to calculate the "external" interactions of the cited processes. The internal hydrogen bond plays a very important role, in the gas and in the liquid phase, for the ortho isomers. In the para derivatives the resonance effect prevails in the solvation of the phenols over the whole morel fraction, while in the meta derivatives the inductive effect influences the solvation of the phenols only in water-rich solutions
A study of the proton transfer of the nitro-substituted benzoic acids in water-dimethylsulfoxide mixtures compared with the same process in the gaseous phase.
A study of the proton transfer process from nitro-substituted benzoic acids to benzoic acid in H2O-DMSO mixtures compared with the same process in the gaseous phase is presented. A thermodynamic cycle allows calculation of a transfer process in solvent X which refers to a gaseous initial state, i.e. dDPi g->x. These thermodynamic quantities have been assumed as a measure of "external" solute-solvent interactions. It may be noted that in solution the resonance effect appears in the ortho-anion, while in the gaseous phase the resonance is effective for the para-compound. A comparison with the chloroisomers shows that the proton transfer process is easier for the nitro-isomers in the gas phase while the contrary is true in solution
Thermodynamics of the second proton dissociation processes of nine alfa-amino acids and third ionization processes of glutamic acid, aspartic acid and tyrosine.
Termodinamica dei dipeptidi. Influenza delle forze idrofobiche delle catene laterali sui processi di dissociazione di alcune serie di dipeptidi.
Trento, 10 - 11 settembre 2001
Thermal analysis of dipeptides. Part III. Decomposition processes of a series of dipeptides having a-alanine as first common term. Influence of the components
Statistical study of the influence of the hydroxyl groups in position 3 and 4 on the ionization process of 3,4-dihydroxybenzoic acid.
Statistical study of the influence of the Nitro groups on the ionization and solvation processes of disubstituted benzoic derivatives.
BUTTON CELLS BASED ON THE LI/BI2O3 COUPLE
Lithium button cells (1.5V) with thermally treated Bi2O3 cathodes (additive free), mainly of 11.4*3.4 mm standard size (100 mAh), have been constructed. They are characterized by high volumetric energy densities even at high discharge rate. The cell behaviour is also satisfactory after 1 year's storage, at low temperature (-10 °C) and under 500 μA pulses. Comparison with analogous Li cells (Li/FeS2 and Li/Pb2Bi2O5) or aqueous cells (Zn/HgO and Zn/Ag2O) confirms the usefulness of this system as a power source for microelectronic devices. This was also substantiated by field tests
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