When certain highly concentrated gels, such as silicic acid, are allowed to stand entirely undisturbed for an extended period, they uniquely undergo a structural phenomenon where they visibly shrink a

Question

When certain highly concentrated gels, such as silicic acid, are allowed to stand entirely undisturbed for an extended period, they uniquely undergo a structural phenomenon where they visibly shrink and spontaneously exude very small quantities of their trapped liquid continuous medium. What is the precise scientific terminology for this specific physical behavior?

Prashant Kotian · Accepted Answer

Correct answer: C. The spontaneous exudation or macroscopic liberation of the trapped liquid medium from a static gel structure upon standing is specifically defined in colloid chemistry as syneresis or the "weeping" of gels. This phenomenon represents the physical and thermodynamic reverse of gel swelling.

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