Staff directory Javier Rodríguez-Viejo

Publications

2023

• Emergence of equilibrated liquid regions within the glass

  Vila-Costa, A; Gonzalez-Silveira, M; Rodriguez-Tinoco, C; Rodriguez-Lopez, M; Rodriguez-Viejo, J Nature Physics; 19 (1): 114 - +. 2023. 10.1038/s41567-022-01791-w.

  ---

2022

• Ultrastable glasses: new perspectives for an old problem

  Rodriguez-Tinoco C., Gonzalez-Silveira M., Ramos M.A., Rodriguez-Viejo J. Rivista del Nuovo Cimento; 45 (5): 325 - 406. 2022. 10.1007/s40766-022-00029-y. IF: 3.000

  Ultrastable glasses (mostly prepared from the vapor phase under optimized deposition conditions) represent a unique class of materials with low enthalpies and high kinetic stabilities. These highly stable and dense glasses show unique physicochemical properties, such as high thermal stability, improved mechanical properties or anomalous transitions into the supercooled liquid, offering unprecedented opportunities to understand many aspects of the glassy state. Their improved properties with respect to liquid-cooled glasses also open new prospects to their use in applications where liquid-cooled glasses failed or where not considered as usable materials. In this review article we summarize the state of the art of vapor-deposited (and other) ultrastable glasses with a focus on the mechanism of equilibration, the transformation to the liquid state and the low temperature properties. The review contains information on organic, metallic, polymeric and chalcogenide glasses and an updated list with relevant properties of all materials known today to form a stable glass. © 2022, The Author(s).

  View abstract

  ---

2021

• A generalized approach for evaluating the mechanical properties of polymer nanocomposites reinforced with spherical fillers

  Martinez-Garcia J.C., Serraïma-Ferrer A., Lopeandía-Fernández A., Lattuada M., Sapkota J., Rodríguez-Viejo J. Nanomaterials; 11 (4, 830) 2021. 10.3390/nano11040830. IF: 5.076

  In this work, the effective mechanical reinforcement of polymeric nanocomposites containing spherical particle fillers is predicted based on a generalized analytical three-phase-series-parallel model, considering the concepts of percolation and the interfacial glassy region. While the concept of percolation is solely taken as a contribution of the filler-network, we herein show that the glassy interphase between filler and matrix, which is often in the nanometers range, is also to be considered while interpreting enhanced mechanical properties of particulate filled polymeric nanocomposites. To demonstrate the relevance of the proposed generalized equation, we have fitted several experimental results which show a good agreement with theoretical predictions. Thus, the approach presented here can be valuable to elucidate new possible conceptual routes for the creation of new materials with fundamental technological applications and can open a new research avenue for future studies. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

  View abstract

  ---