During freezing, the contact angle affects the heterogeneous nucleation. It is available to calculate the free energy barrier of heterogeneous ice nucleation by contact angle. So, how to measure the contact angle between substrate interference and hydrogel?
Youchuan Ma
The work of formation of a heterogeneous nucleus is related to the work of W(hom) by the relation:
W(het) = f (angle contact) Whom,
since the coefficient f (angle contact), depending on the angle contact, can vary from 1 to 0, the work Whet decreases from its maximum value, that is, the value of Whom at angle contact = 180° (with complete non- wetting of the surface of the new phase) to zero at angle contact=0° (with perfect wetting). consequently, with good wetting of the surface of the new phase, the appearance of this new phase can occur even at very low supersaturations.
However, your ultraviscous solution/hydrogel system does not fit this theory. An ultraviscous solution is not a hard surface. Most likely, the process of swelling of the ultraviscous solution at a low rate will be observed. Otherwise, the main thing will be not the contact angle, but the diffusion of the solvent.
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