| Texto completo | |
| Autor(es): |
Gupta, Prabhat K.
;
Cassar, Daniel R.
;
Zanotto, Edgar D.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Chemical Physics; v. 145, n. 21 DEC 21 2016. |
| Citações Web of Science: | 13 |
| Resumo | |
The temperature at which the classical critical nucleus size is equal to the average size of the cooperatively rearranging regions (CRR) in a supercooled liquid has been referred to as a ``cross-over{''} temperature. We show, for the first time, using published nucleation rate, viscosity, and thermophysical data, that the cross-over temperature for the lithium disilicate melt is significantly larger than the temperature of the kinetic spinodal and is equal or close to the temperature corresponding to the maximum in the experimentally observed nucleation rates. We suggest that the abnormal decrease in nucleation rates below the cross-over temperature is most likely because, in this regime, the CRR size controls the critical nucleus size and the nucleation rate. This finding links, for the first time, measured nucleation kinetics to the dynamic heterogeneities in a supercooled liquid. Published by AIP Publishing. (AU) | |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 15/01848-9 - Cristalização próxima a TG de vidros líquidos super-resfriados |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |