Upper bound of fragility from spatial fluctuations of shear modulus and boson peak in glasses

Novikov, V. N.

doi:10.1103/physreve.106.024611

Cited by 8 publications

(2 citation statements)

References 71 publications

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“…These values are close to those of most polymers, some small organic molecules with abundant aromatic groups, and inorganic glass formers with strong ionic interactions 41,42 . Yet, these values markedly deviate from those of traditional silicate glass-formers, water, and small organic molecules with strong hydrogen bonding interactions 41,[43][44][45] . This disparity can be ascribed to the synergy of hydrogen bonds, aromatic interactions, and hydrophobic effects 3,46 .…”

Section: Resultsmentioning

confidence: 75%

Cyclic Peptide High-Entropy Noncovalent Glass

Yan,

Yuan,

Fan

et al. 2023

Preprint

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The design and exploration of stable noncovalent glass based on biomolecules are paramount for the sustainable development of human society. Cyclic peptides (CPs) with remarkable structural rigidity and decent resistance to enzymatic degradation can serve as promising glass formers. However, the potent crystallization tendency hinders their potential in glass construction. Herein, we engineered a series of CP glasses with tunable glass transition behaviors by modulating the conformational complexity of CP clusters. The increasing conformational entropy of the supercooled liquid of CPs compared to their crystalline counterparts is fundamental to the formation of CP noncovalent glass. By incorporating multicomponent CPs, the formation of high-entropy CP (HECP) glass is facilitated, which in turn inhibits the crystallization and decomposition of individual CPs. This process ultimately enhances the stability of CP noncovalent glass. Such HECP glass exhibits enhanced mechanical properties compared to individual CP glass due to the promoted connectivity within the glass network. These findings offer a promising paradigm for designing and developing stable noncovalent glass based on naturally derived biomolecules and advancing their application in pharmaceutical formulations and smart materials.

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Section: Resultsmentioning

confidence: 75%

Cyclic Peptide High-Entropy Noncovalent Glass

Yan,

Yuan,

Fan

et al. 2023

Preprint

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“…5 . It is noted that this upper bound fragility value of 70 is predicted only for silicate glasses with a ring structure; glasses with other structural types, such as molecular materials and polymers, may have much higher fragility values, with an upper limit predicted to be 180 34 .…”

Section: Resultsmentioning

confidence: 99%

Revealing the relationship between liquid fragility and medium-range order in silicate glasses

et al. 2023

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Despite decades of studies, the nature of the glass transition remains elusive. In particular, the sharpness of the dynamical arrest of a melt at the glass transition is captured by its fragility. Here, we reveal that fragility is governed by the medium-range order structure. Based on neutron-diffraction data for a series of aluminosilicate glasses, we propose a measurable structural parameter that features a strong inverse correlation with fragility, namely, the average medium-range distance (MRD). We use in-situ high-temperature neutron-scattering data to discuss the physical origin of this correlation. We argue that glasses exhibiting low MRD values present an excess of small network rings. Such rings are unstable and deform more readily with changes in temperature, which tends to increase fragility. These results reveal that the sharpness of the dynamical arrest experienced by a silicate glass at the glass transition is surprisingly encoded into the stability of rings in its network.

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