Some features of metastable zone width of various systems determined by polythermal method
Artykuł w czasopiśmie
MNiSW
35
Lista A
| Status: | |
| Autorzy: | Sangwal Keshra |
| Rok wydania: | 2011 |
| Wersja dokumentu: | Drukowana |
| Język: | angielski |
| Numer czasopisma: | 2 |
| Wolumen/Tom: | 13 |
| Strony: | 489 - 501 |
| Impact Factor: | 3,842 |
| Web of Science® Times Cited: | 36 |
| Scopus® Cytowania: | 43 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| The experimental data on the metastable zone width, as determined by the maximum supercooling ?Tmax using the conventional polythermal method, of the following six compounds: keto-1,2,3,4-tetrahydro-6-methylcarbazole (KTMC), L(+)-ascorbic acid (LAA), 3-nitro-1,2,4-triazol-5-one (NTO), potassium tetraborate tetrahydrate (KTB), 1,3-dipalmitoyl-2-oleoylglycerol (POP), and tripalmitoylglycerol (PPP) published in the literature are analyzed using the relations: ln(?Tmax/T0) = ? + ßlnR (K. Sangwal, Cryst. Res. Technol., 2009, 44, 231) and (T0/?Tmax)2 = F(1 - ZlnR) (K. Sangwal, Cryst. Growth Des., 2009, 9, 942). Here ?, ß, F and Z are constants, and T0 is the saturation temperature of a solute–solvent system. It was found that: (1) for all solute–solvent systems the values of -? and ln(F1/2) depend on saturation temperature T0 by an Arrhenius-type equation with an activation energy Esat, (2) the activation energy Esat for different solute–solvent systems does not show any well-defined relationship with their corresponding enthalpy of dissolution ?Hs, and (3) the parameters ß and Z are relatively insensitive to changes in saturation temperature T0. Analysis of the results suggests that: (1) the absence of intimate relationship between Esat and ?Hs for a system is a consequence of the nature of the processes involved; the value of ?Hs is associated with solute–solvent interactions, whereas the value of Esat is connected with the diffusion of species involved in the formation of three-dimensional nuclei, and (2) the values of ß and Z for a solute–solvent system are determined by the nature of species diffusing in the solution during its cooling. |
