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Organic and metallic glasses: structure, dynamics and stability

Total activity: 22
Type of activity
Competitive project
Funding entity
MIN DE ECONOMIA Y COMPETITIVIDAD
Acronym
OMeGlaSS
Funding entity code
FIS2014-54734-P
Amount
157.300,00 €
Start date
2015-01-01
End date
2017-12-31
Abstract
This project joins two long-experience, complementary and scientifically contrasted research groups working within the framework of
glassy state on different materials with the aim of sharing knowledge and available equipment,
The glass transition is an unsolved problem which refers to the generic change in a many-body system from an equilibrium disordered
state to a non-equilibrium disordered state with physical properties close to the solid state. This change is not a transition in the
thermodynamic sense, but a kinetic phenomenon where the amorphous solid is dynamically arrested, i.e., does not have enough time to
relax on experimental timescales. Relaxation tries to drive the system to the true stable thermodynamic state, typically an ordered crystal,
on a time scale impractical on the available observation time, leaving the system trapped in a disordered yet solid unstable state. The
prototypical glass formers are molecular or atomic liquids supercooled beyond their crystallization transitions, where the decrease in
temperature (or increase in pressure) leads to an effective increase in density and enthalpy. The key to solving the glass transition
problem, with the immense spectral range 10^(-14) - 10^(6) s in the time domain, is ultimately the full understanding of the physics
governing the structural relaxation, its dynamic properties, the links between structural short-range order and dynamics and the influence
of low temperature secondary relaxation.
The aims of the research project are the fundamental understanding and predictions of the dynamic properties of a wide variety of glasses
(structural organic, SG, metallic, MG, and low-dimensional, LDG) by finding quantitative connections (relating relaxation properties,
intermolecular interactions and thermodynamic features) that control the process of the dynamic arrest emerging at the glass transition.
The project will also focus on the dynamics accounting for the freezing of internal molecular motions associated with the existence of
several molecular conformers as well as with the special disorder emerging by the reorientational jumps at different time scales of
molecules occupying non-equivalent environments (LDG). The knowledge of the glass dynamics is the key to predict the stability of the
glass (including the mechanical and chemical stability in the case of MG) on the long term.
A variety of preparation methods of glassy materials will strength the understanding of the amorphous state. In particular, thin-film (TFG)
glasses would enable us to deeply study the stability of glasses as well as to get insight into the influence of pressure in the
recrystallization and devitrification processes on so-obtained materials.
The project will also deepen on the links between the dynamics phenomena and structural features of the SGs, OGs, MGs and TFGs,
especially those concerning short-range order.
The influence of pressure in the dynamics of glasses will be one of the objectives. Pressure will be a key parameter to disentangle the two
competitive driving forces having critical influence on the crystallization and devitrification processes, i.e. kinetics (nucleation and growth)
and thermodynamics (chemical potential difference) for both bulk and thin-film glasses.
Scope
Adm. Estat
Plan
Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016
Call year
2015
Funcding program
Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia
Funding subprogram
Subprograma Estatal de Generación de Conocimiento
Funding call
Excelencia: Proyectos I+D
Grant institution
Gobierno De España. Ministerio De Economía Y Competitividad, Mineco

Participants

Scientific and technological production

1 to 22 of 22 results