Superheating and Homogeneous Melting Dynamics of Bulk Ice

Fanetti, Samuele; Falsini, Naomi; Bartolini, Paolo; Citroni, Mario; Lapini, Andrea; Taschin, A.; Bini, Roberto

doi:10.1021/acs.jpclett.9b01490

Cited by 13 publications

(22 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some of the IR absorption spectra are shown in Figure in the region of a combination band of water, bending plus H-bond libration (ν 2 + L ), which is used as a probe of the transition as it is always in scale and changes considerably upon crystallization. The same behavior is also observed in pure ice, where a shift of about 70 cm –1 is measured (from 2150 to 2220 cm –1 ) at ambient pressure …”

Section: Resultssupporting

confidence: 79%

Growth Dynamics of Crystalline Ar Hydrate

2020

Self Cite

View full text Add to dashboard Cite

The formation of a clathrate hydrate crystal is characterized by several steps, each of them distinguished by a different structural arrangement and temporal duration. A precise definition of these different forms is a challenging task, because the entirety of the formation dynamics spans over a time interval ranging from few nanoseconds to several days. Computational methods are powerful and essential to define the nucleation step, but they fail in providing a reliable picture of the long-range order establishment. On the other side, the experimental methods employed in the study of the growth dynamics usually monitor the hydrate growth at the interface with the fluid and thus are limited by the diffusion of the guest molecules through the newly formed hydrate phase. This problem is overcome here by the confinement of an argon hydrate sample in a sapphire anvil cell, allowing monitoring of the melting and crystallization of hydrates under moderate pressures by FTIR and Raman spectroscopies. This approach, besides providing a spectroscopic characterization of this hydrate, allowed the time windows characteristic of the formation of a macroscopic amorphous phase to be identified, possibly coincident with the so-called blob, and its rapid evolution toward the achievement of the local structure. Long-range ordering takes place on a longer time scale, most of it is realized in few hours but still evolving for weeks. No hints for supporting the so-called memory ef fect are gained through this study.

show abstract

Section: Resultssupporting

confidence: 79%

Growth Dynamics of Crystalline Ar Hydrate

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…A 2-mm IR pulse can superheat ice and partially melt it within 10 ns (36), and such partial melting was achieved with the current setup for a 100-mm-thick hexagonal ice (I h ) sample ( Fig. 1B) (35).…”

mentioning

confidence: 93%

Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure

Kim

Amann‐Winkel

Giovambattista

et al. 2020

Science

196

208

View full text Add to dashboard Cite

We prepared bulk samples of supercooled liquid water under pressure by isochoric heating of high-density amorphous ice to temperatures of 205 ± 10 kelvin, using an infrared femtosecond laser. Because the sample density is preserved during the ultrafast heating, we could estimate an initial internal pressure of 2.5 to 3.5 kilobar in the high-density liquid phase. After heating, the sample expanded rapidly, and we captured the resulting decompression process with femtosecond x-ray laser pulses at different pump-probe delay times. A discontinuous structural change occurred in which low-density liquid domains appeared and grew on time scales between 20 nanoseconds to 3 microseconds, whereas crystallization occurs on time scales of 3 to 50 microseconds. The dynamics of the two processes being separated by more than one order of magnitude provides support for a liquid-liquid transition in bulk supercooled water.

show abstract

“…[98] It is thus recommended to carefully analyze the specific conditions of the specific nanosystem under study, especially concerning the atomic structure of the interfaces of the nanosystem with its environment, to assess whether kinetic superheating or size-dependent thermodynamics govern the melting transformation. While complex systems such as ice might show a completely different behavior, [100] recent studies on homogeneous melting close to the limit of superheating might need to take special care to evaluate the respective contributions due to thermodynamics and kinetics to the observed shift of the transformation temperature. [101][102][103][104]…”

Section: Superheating or Melting-point Variation?mentioning

confidence: 99%

Structural Phase Transformations in Nanoscale Systems

Wilde

2021

Adv Eng Mater

View full text Add to dashboard Cite

As characteristic size scales of materials systems tend to progressively become shorter, size‐dependent materials’ behavior becomes increasingly important. Related to many aspects concerning stability, function, and performance are phase transformations that might be necessary to obtain a specific state or are necessary to avoid to retain a specific phase or state with desired properties. At dimensions in the range of tens nanometers or below, size effects affect structural phase transformations significantly. Opinions and models about the origin of the size‐dependence abound since several decades. However, more recent results allow analyzing the local atomic structure of the particle/matrix interfaces as well as local strain contributions in detail. In addition, size‐dependent measurements of excess thermodynamic potentials can be carried out and rate‐dependent analyses explore new regimes at significantly enhanced heating rates. These recent results serve to estimate the relative importance of kinetic and different thermodynamic contributions. Herein, the emphasis is on summarizing the recent progress that is made on the size effect and on the impact of the interfacial structure on the melting transformation of embedded nanoparticles. At the same time, these results serve to considerably enhance the understanding of the melting process in general.

show abstract

Superheating and Homogeneous Melting Dynamics of Bulk Ice

Cited by 13 publications

References 37 publications

Growth Dynamics of Crystalline Ar Hydrate

Growth Dynamics of Crystalline Ar Hydrate

Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure

Structural Phase Transformations in Nanoscale Systems

Contact Info

Product

Resources

About