Quasi-liquid layers

Figure 4.10. Kuroda s model explaining the repeated Habitus change of snow crystals [23]. Shaded areas are crystals dotted areas are QLLs (quasi-liquid layers).

A MECHANISM FOR PHOTOCHEMICAL REACTIONS IN THE QUASI-LIQUID LAYER OF SNOW CRYSTALS IN POLAR REGIONS... 

Figure 2 shows the thickness of the lubricating layer, / , as a function of distance along the dynamic contact zone. The upstream boundary value of h is the depth of the quasi-liquid layer based on the ice surface temperature." The quasi-liquid layer serves as the lubricant over the first 0.1% of the contact zone. The upper curve represents the frictional melting term (first term on the rhs of Eq (5)). The effects of adding squeeze flow and heat conduction into the ice are shown by the two intermediate curves. The lowest curve combines all factors, and shows... 

Under conditions typical of competitive speedskating, frictional melting, squeeze flow and heat conduction into the ice all play an important role in determining skate blade lubrication. Pressure-induced freezing point depression and the quasi-liquid layer are accounted for in the model, but they play only a minor role in determining the kinetic ice friction coefficient. 

Figure 3.4.2.13c, finally, shows a situation that is in-between the two previous cases. In general, one may expect the Hquid to be neither fully ordered nor fully disordered. The partial order in such a quasi-liquid layer leads to small contributions to rods with in-plane momentum transfer the smaller the in-plane momentum transfer, the larger is the contribution. Thus, here the Hquid is also expected to have the strongest contribution to the specular rod. By measuring a set of rods with different in-plane momentum transfers, one can thus unravel the stracture of the crystal (dominant at large momentum transfer) from the liquid (most important at the specular rod) and arrive at a complete stmcture determination of the interface... 

Figure 17.4 Schematic illustrations of ice crystal surfaces a bare surface (a) and a surface covered with a quasi-liquid layer (QLL) formed by surface melting (b). At temperature T lower than the critical temperature...

Dynamic Behavior of a Quasi-Liquid Layer on the Ice Surface... 

Quasi-liquid layers on ice crystal surfeces are made up of two different phases. Proc. Natl. Acad. Sci. U.S.A., 109, 1052-1055. 

Neshyba, S., Nugent, E., Roeselova, M., and Jungwirth, P. (2009) Molecular dynamics study of ice-vapor interactions via the quasi liquid layer. J. Phys. Chem. C, 113, 4597-4604. 

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