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When making contact with an undercooled target, a drop freezes. The colderthe target is, the more rapid the freezing is supposed to be. In this research,we explore the impact of droplets on cold granular material. As theundercooling degree increases, the bulk freezing of the droplet is delayed byat least an order of magnitude. The postponement of the overall solidificationis accompanied by substantial changes in dynamics, including thespreading-retraction process, satellite drop generation, and cratering in thetarget. The solidification of the wetted pores in the granular target primarilycauses these effects. Owing to the small size of pores, solidification there issufficiently fast to match the characteristic timescales of the impact dynamicsat moderate undercooling degrees. As a result, the hydrophilic impact appears`hydrophobic', and the dimension of the solidified droplet shrinks. A monolayerof cold grains on a surface can reproduce these consequences. Our researchpresents a potential approach to regulate solidified morphology for subfreezingdrop impacts. It additionally sheds light on the impact scenario of strongcoupling between the dynamics and solidification.

Cold granular targets slow the bulk freezing of an impacting droplet