Catalan researcher at the Group of Biophysics and Molecular Physics at the University of Silesia in Katowice. My research is based on the study of the properties of vapour deposited glasses, aimed to the development of glass technology and its application in several important industries, such pharmaceutical or electronics. Previously, I obtained my PhD at the Group of Nanomaterials and Microsystems (GNaM) of Universitat Autònoma de Barcelona.
AREAS OF WORK
Physical Vapour Deposition
Why is the change of the Johari–Goldstein β-relaxation time by densification in ultrastable glass minor?
Ultrastable glasses (USG) formed by vapor deposition are considerably denser. The onset temperature of devitrification, Ton, is significantly higher than Ton or Tg of ordinary glass (OG) formed by cooling, which implies an increase of the structural α-relaxation time by many orders of magnitude in USG compared to that in OG at the same temperature. However, for a special type Read more about Why is the change of the Johari–Goldstein β-relaxation time by densification in ultrastable glass minor?[…]
Secondary relaxations persistent in the glassy state after structural arrest are especially relevant for the properties of the glass. A major thrust in research in dynamics of glass-forming liquids is to identify what secondary relaxations exhibit a connection to the structural relaxation and are hence more relevant. Via the Coupling Model, secondary relaxations having such connection have Read more about Distinguishing different classes of secondary relaxations from vapour deposited ultrastable glasses[…]
Emergence of a substrate-temperature-dependent dielectric process in a prototypical vapor deposited hole-transport glass
Since the discovery of ultrastability, vapor deposition has emerged as a relevant tool to further understand the nature of glasses. By this route, the density and average orientation of glasses can be tuned by selecting the proper deposition conditions. Dielectric spectroscopy, on the other hand, is a basic technique to study the properties of glasses Read more about Emergence of a substrate-temperature-dependent dielectric process in a prototypical vapor deposited hole-transport glass[…]
Secondary relaxations are fundamental for their impact in the properties of glasses and for their inseparable connection to the structural relaxation. Understanding their density dependence and aging behavior is key to fully address the nature of glasses. Ultrastable glasses establish a new benchmark to study the characteristics of secondary relaxations, since their enthalpy and density Read more about Secondary relaxation in ultrastable etoricoxib: evidence of correlation with structural relaxation[…]
Recently Fakhraai and coworkers measured surface diffusion in ultrastable glass produced by vapor deposition, ordinary glass with and without physical aging, and ultrathin films of the same molecular glass-former, N,N′-bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD). Diffusion on the surfaces of all these glasses is greatly enhanced compared with the bulk diffusion similar to that previously found by others, but remarkably Read more about Why is surface diffusion the same in ultrastable, ordinary, aged, and ultrathin molecular glasses?[…]
At present, we are witnessing a renewed interest in the properties of densified glasses prepared by isobaric cooling of a liquid at elevated pressure. As high-pressure densification emerges as a promising approach in the development of glasses with customized features, understanding and controlling their unique properties represent a contemporary scientific and technological goal. The results Read more about The dielectric signature of glass density[…]
The role of thermodynamic stability in the characteristics of the devitrification front of vapour-deposited glasses of toluene
Physical vapour deposition (PVD) has settled in as an alternative method to prepare glasses with significantly enhanced properties, providing new insights into the understanding of glass transition. One of the striking properties of some PVD glasses is their transformation into liquid via a heterogeneous mechanism that initiates at surfaces/interfaces. Here, we use membrane-based fast-scanning nanocalorimetry (104 K s−1) Read more about The role of thermodynamic stability in the characteristics of the devitrification front of vapour-deposited glasses of toluene[…]
Vapour deposited ultrastable glasses have gained much attention since its discovery in 2007 by the group of Mark Ediger. By physical vapour deposition, at proper deposition conditions, it is possible to obtain, in just few minutes, glasses with a thermodynamic stability that rivals the stability of glasses naturally aged for millions of years, i.e. ambers. Read more about Ultrastable glasses portray similar behaviour to ordinary glasses at high pressure[…]
Up to this moment, the dynamics of glasses have been measured in a very short temperature range, limited by their time-scale. At low temperatures, the dynamics of glasses are too slow to be measured and at too high temperatures, the glass relax into the equilibrium supercooled state before being possible to extract any information by Read more about Relaxation dynamics of glasses along a wide stability and temperature range[…]