in dilute aqueous solution [ 1 ]. My remit here in this brief contribution is to give an overview of the picture now emerging of the thermodynamics of such interactions, with an attempt to understand the fundamental molecular basis for the phenomena
Reducing dimensions of the combustion chamber with simultaneous growth of mean effective pressure definitely influences thermodynamics of combustion process as well as it puts into consideration the thermal load of the engine components.
Thermodynamics attracts especial attention because it is considered to govern all the processes in the Universe. Grate efforts were made to justify fundamental nature of basic thermodynamic concepts and to manage
Authors:Banjong Boonchom and Chanaiporn Danvirutai
The binary manganese and calcium dihydrogen phosphate monohydrate Mn0.5Ca0.5(H2PO4)2 · H2O was synthesized by a rapid and simple co-precipitation method using phosphoric acid, manganese metal, and calcium carbonate
at ambient temperature. Thermal transformation shows complex processes and the final decomposed product was the binary manganese
calcium cyclotetraphosphate MnCaP4O12. The activation energies of some decomposed steps were calculated by Kissinger method. Activated complex theory has been
applied to each step of the reactions and the thermodynamic functions are calculated. These values for transformation stages
showed that they are non-spontaneous processes without the introduction of heat. The differences of physical and chemical
properties of the synthesized compound and its decomposed product are compared with M(H2PO4)2 · H2O and M2P4O12 (M = Mn and Ca), which indicate the effects of the presence of Ca ions in substitution of Mn ions and confirm the formation
of solid solution.
chemistry and biophysics, pharmacology, biomedical technology and so forth. In particular the study of the solubility of nonelectrolytes in liquids has been of immense value for the development of the general discipline of mixture thermodynamics. For
The relationship between cavity thermodynamics in water and air-water surface tension is investigated in the present study.
The effective hard sphere diameter of water molecules over a large temperature range is estimated from the experimental air-water
surface tension, and cavity thermodynamics is calculated by means of classic scaled particle theory. The work of cavity creation
proves to be a decreasing function of temperature and the cavity entropy change is a positive, practically constant, quantity,
regardless of the cavity diameter, in marked contrast with well established theoretical and computer simulation results. This
finding suggests that the relationship between cavity thermodynamics and surface tension is not a simple matter in the case
Authors:A. Marini, V. Berbenni, G. Bruni, R. Riccardi, and M. Villa
The thermodynamics of β-cyclodextrin dehydration is investigated, by parallel DSC/TG experiments, on both fully and partially
hydrated samples. The apparent dehydration enthalpies per mole of water are impossibly high and this fact suggests that another
phenomenon, in addition to the rupture of the β-cyclodextrin/H2O hydrogen bonds, contributes to the peak area. All the experimental evidence agrees with an ‘interaction model’ which assumes
that deydration is accompanied by a slow and reversible rearrangement of the β-cyclodextrin structure.
Theoretical possibilities of determining energetic and thermodynamic characteristics of chemical entities in gaseous and condensed
(solid and liquid) phases are briefly reviewed. The considerations include quantum chemistry methods which enable evaluation
of energetic quantities and statistical thermodynamics dependencies necessary for determining other thermodynamic characteristics.
The possible applications of these methods are also discussed in brief.