TIP APPEARANCE ON TOP HYDROGEL BALL SEGMENT DURING ITS FREEZING
https://doi.org/10.26583/vestnik.2024.307
EDN: FGDXFE
Abstract
It is known that when a drop of water sitting on a cooled horizontal flat substrate freezes, a sharp conical tip appears on the top of this drop. The process of freezing of hydrogel ball segments pre-saturated with water was studied. The segments were placed on a horizontal cooling flat surface. The surface was cooled by the Peltier element. The sharp conical tips appearance on the tops of hydrogel ball segments was recorded for the first time. They are similar to the tips appearing on the frozen water drops. It was established by direct video visualization that upward solidification fronts are observed during the freezing of hydrogel ball segments. These fronts curvature and volumetric expansion of water in hydrogel nano-pores are the reasons of tips appearance during freezing. It was also found that the material of these tips after freezing is ice. At the same time, no traces of polyacrylamide were found in the tips.
About the Authors
V. A. Dekhtyar
Russian Federal Nuclear Center – All-Russia Scientific research Institute of Experimental Physics
Russian Federation
Russian Federation
A. E. Dubinov
Российский федеральный ядерный центр – Всероссийский научно-исследовательский институт экспериментальной физики;
Саровский физико-технический институт – филиал Национального исследовательского ядерного университета «Московский инженерно-физический институт»
Russian Federation
Russian Federation
Russian Federal Nuclear Center – All-Russia Scientific research Institute of Experimental Physics;
Sarov Physical Technical Institute – the branch of National Research Nuclear University «Moscow Engineering Physics Institute»
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Review
For citations:
Dekhtyar V.A., Dubinov A.E. TIP APPEARANCE ON TOP HYDROGEL BALL SEGMENT DURING ITS FREEZING. Vestnik natsional'nogo issledovatel'skogo yadernogo universiteta "MIFI". 2024;13(2):61-65. (In Russ.) https://doi.org/10.26583/vestnik.2024.307. EDN: FGDXFE
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