Ideally glassy hydrogen-bonded networks

Phillips, J. C.

doi:10.1103/physrevb.73.024210

Cited by 35 publications

(82 citation statements)

References 71 publications

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“…Trehalose, composed of two Dglucose rings is bisymmetric compared to sucrose which is characterized by the asymmetry of the constituent glucose and fructose rings. This binary symmetry in the glucose units led Phillips (38) to propose a "tandem sandwich" structure for trehalose. In this structure, strongly bound pairs of glucose rings are alternated with weakly bound pairs resulting in a stable and flexible arrangement.…”

Section: Variation Of Activation Energy Through the Glass Transition mentioning

confidence: 98%

Implications of Global and Local Mobility in Amorphous Sucrose and Trehalose as Determined by Differential Scanning Calorimetry

et al. 2009

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Trehalose, having a lower free volume in the glassy state due to a more tightly packed molecular structure, is characterized by larger activation energies of alpha-relaxation and experiences a greater effect of temperature on the reduction in the activation energy barrier for viscous flow. The pronounced increase in cooperative motions in sucrose upon annealing at temperatures below (T(g) -50) suggest that even a small excursion in temperature could result in a significant increase in mobility.

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Section: Variation Of Activation Energy Through the Glass Transition mentioning

confidence: 98%

Implications of Global and Local Mobility in Amorphous Sucrose and Trehalose as Determined by Differential Scanning Calorimetry

et al. 2009

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“…First observed by Kohlrausch around the time of development of Maxwell relaxation theory [40], the physical origin of SER has been widely discussed [34,41,42]. It is believed that SER is as a result of cooperativity of molecular relaxation emerging in the viscous regime.…”

Section: Relationship To Maxwell Relaxation Theorymentioning

confidence: 99%

Collective modes and thermodynamics of the liquid state

2015

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Strongly interacting, dynamically disordered and with no small parameter, liquids took a theoretical status between gases and solids, with the historical tradition of hydrodynamic description as the starting point. We review different approaches to liquids as well as recent experimental and theoretical work, and propose that liquids do not need classifying in terms of their proximity to gases and solids or any categorizing for that matter. Instead, they are a unique system in their own class with a notably mixed dynamical state in contrast to pure dynamical states of solids and gases. We start with explaining how the first-principles approach to liquids is an intractable, exponentially complex problem of coupled non-linear oscillators with bifurcations. This is followed by a reduction of the problem based on liquid relaxation time τ representing non-perturbative treatment of strong interactions. On the basis of τ , solid-like high-frequency modes are predicted and we review related recent experiments. We demonstrate how the propagation of these modes can be derived by generalizing either hydrodynamic or elasticity equations. We comment on the historical trend to approach liquids using hydrodynamics and compare it to an alternative solid-like approach. We subsequently discuss how collective modes evolve with temperature and how this evolution affects liquid energy and heat capacity as well as other properties such as fast sound. Here, our emphasis is on understanding experimental data in real, rather than model, liquids. Highlighting the dominant role of solid-like high-frequency modes for liquid energy and heat capacity, we review a wide range of liquids: subcritical low-viscous liquids, supercritical state with two different dynamical and thermodynamic regimes separated by the Frenkel line, highly-viscous liquids in the glass transformation range and liquid-glass transition. We subsequently discuss the fairly recent area of liquid-liquid phase transitions, the area where the solid-like properties of liquids have become further apparent. We then discuss gas-like and solid-like approaches to quantum liquids and theoretical issues that are similar to the classical case. Finally, we summarize the emergent view of liquids as a unique system in a mixed dynamical state, and list several areas where interesting insights may appear and continue the extraordinary liquid story.

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“…An overall view of the literature results provides numerous hints toward a better understanding of amorphous/glassy states, 1,2 and of their role in many technologically relevant processes, for example, in pharmaceutics. 3 It is also worth mentioning that physical properties of amorphous carbohydrates (either in the anhydrous or in the low-moisture state) have been always of great interest.…”

Section: Introductionmentioning

confidence: 98%