A procedure for calibrating the temperature scale of a DSC is described. A different calibration trend was obtained using the transition points of organic compounds compared to that found using the melting points of highly pure metals. The crystal-crystal transitions of three ammonium salts were studied by this method; ammonium dihydrogen phosphate and ammonium sulphate were found to be suitabl...

Nano silica sulfuric acid as a solid acid, was described to be an effective catalyst for one-pot three-component reaction of kojic acid, aryl aldehydes and indoles for the preparation of 2-substituted aryl (indolyl) kojic acid derivatives. The catalyst was prepared by combination of chlorosulfonic acid to nano silica gel. The size of nanoparticles were observed with SEM.All prepared compounds w...

Different crystal phase with a same chemical structure, polymorphous, is a specific physical characteristic which determine the end usage of pigments especially in high performance ones. Diketopyrrolopyrrole DPP derivatives, as one of the innovative in heterocyclic pigments, follow this pattern. Synthesis of pigment red 254 in selected crystal phase using ionic liquids was achieved without any ...

We present a thermodynamic model which explains the presence of negative slope in melt curve, as observed systems diverse alkali metals and molecular hydrogen at high pressure. assume that components system can be one two well defined states - associated with low energy, other volume. The exhibits number measurable features are also these therefore expected to all Clapeyron-slope systems: first...

The interface method is a well established approach for predicting melting points of materials using interatomic potentials. However, applying the tedious and involves significant human intervention. whole procedure several successive tasks: estimate rough point, set up structure, run molecular dynamic calculations analyze data. Loop are necessary if predicted point different from estimated one...