HEИндивидуална стипендия2023–2024

RELAX · Revealing the Hidden Mechanism of Room Temperature Relaxation in Glasses

„Хоризонт Европа“ — Действия „Мария Склодовска-Кюри“

Период: 2023-01-01 → 2024-12-31
Финансиране от ЕС: 230 774 €
Участници: 1
Схема: HORIZON-TMA-MSCA-PF-EF

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Накратко на български

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Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Revealing the Hidden Mechanism of Room Temperature Relaxation in Glasses

Does the church glass flow like a liquid at room temperature? This is not just an urban legend but a serious scientific question. Modern glass science believes that although the structure of glass is very similar to that of a supercooled liquid, it is in a deeply dynamics-arrested state at low temperatures (such as room temperature), which makes its properties more like those of a solid than a liquid. However, the latest observation results, showing abnormally occurred relaxation behavior of both oxide glasses and metallic glasses at very low temperatures, have cast doubles on the well-established consensus. In the RELAX project, we aimed at investigating this irregular relaxation process in glasses and to decipher the underlying atomic-scale structural mechanisms. Specifically, the relaxation parameters, including relaxation time τ and Kohlrausch exponent β, were firstly be derived from fitting of the enthalpy or volume changes within low-temperature relaxation. Then, the relaxation behaviors depicted by different macroscopic state parameters (excess enthalpy vs. volume) or measured at different temperatures were compared to explore underlying decorrelation or crossover features of these relaxation modes. Finally, leveraging advanced experimental and modelling techniques, we strived to decode the atomic-scale details of structure reorganization behind such low-temperature relaxation. We focused on uncovering these mechanisms in mixed-alkali bioactive (MAB) glasses and metal-organic framework (MOF) glasses, two families of materials with distinct structural and compositional features. MAB glasses, with their bioactive properties, are critical for applications in bone regeneration and drug delivery. MOF glasses, which combine inorganic nodes with organic linkers, have potential in energy storage and catalysis. By studying how these glasses undergo relaxation at low-temperature, the project sought to correlate their structural rearrangement with relaxation behaviors. This understanding is key to improving the stability, reliability, and performance of these glasses in practical applications, particularly in medical devices, energy storage systems, and other advanced technologies.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Glassmakers have known since ancient times that rapid cooling of a viscous liquid makes it stop flowing and transition into a solid glass state. Glasses are not in thermodynamic equilibrium and consequently their properties change over time as the structure relaxes toward a lower energy state. At room temperature (RT), the glass state is believed to be frozen and remain almost forever (>10^10 years). However, recent stain measurements on aluminosilicate glasses have shown that the dynamics are not fully arrested at RT. That is, RT relaxation occurs and leads to changes in glass volume and enthalpy, thus challenging the current consensus on glass relaxation.In this project, we will decipher the linkage between structure and RT relaxation in selected glasses with different types of chemical bonding. The aim is to reveal the hidden structural mechanism behind RT relaxation. To this end, we will first elucidate the composition dependence of RT relaxation modes and subject the glasses to varying degree of relaxation to identify the crossover temperature of relaxation modes. Then the structural evolution associated with relaxation will be tracked and the corresponding atomic configurations will be constructed. Finally, we will perform rigidity and energy landscape analyses to reveal the connection between glass network topology and propensity toward RT relaxation.The project builds on complementary expertise of the fellow applicant (structure characterization, atomistic simulations) and supervisor (relaxation, glass science). Together with the research and training environment provided by the host organization (Aalborg University, Denmark), this will ensure the achievement of this timely and innovative project as well as the dissemination and exploitation of the expected results. The research outputs will deepen our understanding of glass relaxation. The fellow applicant will emerge from the project with new skills, and the capability to launch his own research group.

Оригинален текст от CORDIS (на английски).

Участници

AALBORG UNIVERSITET · AalborgКоординаторДания