Supercooling and Enthalpy of Mixing of Aqueous Solutions of Tetrabutyl(or isopentyl)ammonium Chloride Subjected to Irradiation with Ultrasonic Waves
| Autor: | Masato Endou, Haruo Nakayama, Chihiro Hayashi |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Bulletin of the Chemical Society of Japan. 69:1187-1190 |
| ISSN: | 1348-0634 0009-2673 |
| DOI: | 10.1246/bcsj.69.1187 |
| Popis: | In order to observe more directly the structural organization of water molecules around a nonpolar molecule in an aqueous solution, the supercooling temperatures and enthalpies of mixing with various solvents were measured using two kinds of aqueous solutions (solutions I and II) of tetrabutyl(or isopentyl)ammonium chloride, which were subjected to different treatments. Solution I was made by melting a hydrate solid formed from the ammonium salts and water and by keeping its temperature only one degree Celsius higher than its dissolution temperature; solution II was made by irradiating solution I with ultrasonic waves (38 kHz) for 20 min at the same temperature as solution I. The supercooling temperatures of solution I were found to be about 10 degrees Celsius higher than those of solution II. The differences in the enthalpies of mixing between solution I and solution II in the same solvent, ΔHI − ΔHII, were found to be about 3 kJ per mole of (n-C4H9)4NCl for most of the solvents. It has been concluded th... |
| Databáze: | OpenAIRE |
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