Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 14, Issue 49, Pages 10999-11007Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.3c02470
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This study investigates the dynamics of the transition from high-density amorphous ice (HDA) to low-density amorphous ice (LDA) using X-ray photon correlation spectroscopy (XPCS). The results reveal non-isotropic and heterogeneous dynamics in the amorphous ice and are consistent with a scenario of static LDA islands floating within a diffusive matrix of high-density liquid water.
Unraveling the mechanism of water's glass transition and the interconnection between amorphous ices and liquid water plays an important role in our overall understanding of water. X-ray photon correlation spectroscopy (XPCS) experiments were conducted to study the dynamics and the complex interplay between the hypothesized glass transition in high-density amorphous ice (HDA) and the subsequent transition to low-density amorphous ice (LDA). Our XPCS experiments demonstrate that a heterodyne signal appears in the correlation function. Such a signal is known to originate from the interplay of a static component and a dynamic component. Quantitative analysis was performed on this heterodyne signal to extract the intrinsic dynamics of amorphous ice during the HDA-LDA transition. An angular dependence indicates non-isotropic, heterogeneous dynamics in the sample. Using the Stokes-Einstein relation to extract diffusion coefficients, the data are consistent with the scenario of static LDA islands floating within a diffusive matrix of high-density liquid water.
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