Silica, Silicate, and Aluminosilicate Glasses

Mahadevan, Thiruvilla S.; Du, Jincheng

doi:10.1002/9781118939079.ch7

Cited by 1 publication

(1 citation statement)

References 197 publications

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“…[Focusing on a reference frame defined solely by the large particles enhances the angular correlation, although other choices, SI Appendix , Figs. S5 and S6 , do give similar results ( 31 ).] Thus, ρ ( θ , ϕ , r ) is a four-point correlation function since the density at a given point in space is calculated with respect to three particles ( 21 , 22 ) and hence can be expected to give significant insight into the relationship between structure and dynamics [Note that to calculate the density distribution ρ ( θ , ϕ , r ), we do not differentiate whether the 4 th particle is large or small].…”

Section: Resultssupporting

confidence: 55%

Intermediate-range order governs dynamics in dense colloidal liquids

Singh

Zhang

Sood

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The conventional wisdom is that liquids are completely disordered and lack nontrivial structure beyond nearest-neighbor distances. Recent observations have upended this view and demonstrated that the microstructure in liquids is surprisingly rich and plays a critical role in numerous physical, biological, and industrial processes. However, approaches to uncover this structure are either system-specific or yield results that are not physically intuitive. Here, through single-particle resolved three-dimensional confocal microscope imaging and the use of a recently introduced four-point correlation function, we show that bidisperse colloidal liquids have a highly nontrivial structure comprising alternating layers with icosahedral and dodecahedral order, which extends well beyond nearest-neighbor distances and grows with supercooling. By quantifying the dynamics of the system on the particle level, we establish that it is this intermediate-range order, and not the short-range order, which has a one-to-one correlation with dynamical heterogeneities, a property directly related to the relaxation dynamics of glassy liquids. Our experimental findings provide a direct and much sought-after link between the structure and dynamics of liquids and pave the way for probing the consequences of this intermediate-range order in other liquid state processes.

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Section: Resultssupporting

confidence: 55%