| Título: | Dielectric study of plasticization and antiplasticization effects in Cretaceous samples from Eastern and Western Venezuela |
| Autores: |
Suárez,N Aldana,M Costanzo-Alvarez,V Sequera,M |
| Fecha: | 2006-05-01 |
| Publicador: | Revista mexicana de física |
| Fuente: |
Ver documento |
| Tipo: | journal article |
| Tema: |
Structural relaxation TSDC plasticization antiplasticization |
| Descripción: | In this work we have studied plasticization and antiplasticization effects using the thermal stimulated depolarization current (TSDC) technique in rocks samples from Cretaceous strata located in North-Eastern (group A) and South-Western (group B) Venezuela . Drying and rehydration treatments show that the dielectric relaxation peaks of both groups are associated with the physisorbed moisture trapped at different sites in the material. In the samples from group A, drying treatments shift the peaks to higher temperatures. Rehydration treatments move the peaks towards lower temperatures and increase the intensity of the peaks. This could be explained in terms of water molecules acting as a plasticizer, that hint the molecular reorientation by increasing the free volume. Concerning the temperature shifting of the peaks the opposite behavior is observed in samples from group B. This antiplasticization effect could be explained in terms of dynamic interactions and restrictions between the sorbed water molecules and the complex polarizable entities of the material. |
| Idioma: | Inglés |
1 | 6 Fracturas maxilofaciales y factores asociados en derechohabientes del IMSS Campeche, México: Análisis retrospectivo 1994-1999 por Medina-Solis,Cario Eduardo,Córdova-González,José Luis,Casanova-Rosado,Alejandro José,Zazueta-Hernández,Maria Alejandra |
2 | 7 Factores de riesgo de mortalidad en el hijo de madre toxémica por Gómez-Gómez,Manuel,Danglot-Banck,Cecilia,García-de la Torre,Guadalupe Silvia,Antonio-Ocampo,Abdiel,Fajardo-Gutiérrez,Arturo,Sánchez-García,Maria Luisa,Ahumada-Ramírez,Elias |
3 Cerámicas mexicanas para cicatrización de piel por Piña-Barba,María Cristina,Tejeda-Cruz,Adriana,Regalado-Hernández,Miguel Ángel,Arenas-Reyes,María Isabel,Martín-Mandujano,Salvador,Montalvo,César | 8 I. De la enseñanza tutoral al aprendizaje a distancia por Cravioto,Alejandro |
4 Seguimiento de egresados de un diplomado en enseñanza de la Medicina por Ponce de León-Castañeda,Ma. Eugenia,Ruíz-Alcocer,Ma. del Carmen,Lozano-Sánchez,J. Rogelio | 9 II. La vocación científica: compromisos con el cambio permanente y la educación continua por Kretschmer,Roberto |
5 Primer estudio de teledermatología en México: Una nueva herramienta de salud pública por Lepe,Verónica,Moneada,Benjamín,Castanedo-Cázares,Juan Pablo,Martínez-Rodríguez,Alejandra,Mercado-Ceja,Sergio M,Gordillo-Moscoso,Antonio | 10 |