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arXiv 0905.1775cond-mat.soft
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物理凝胶中剪切载荷与结构老化的相互作用

Interplay between shear loading and structural aging in a physical gel

O. Ronsin, C. Caroli, T. Baumberger

摘要:

我们表明,明胶凝胶的机械松弛的老化表现出相同的缩放现象的聚合物和胶体玻璃。此外,已知明胶表现出对数结构老化(硬化)。我们发现压力加速了这一过程。然而,这种影响绝对不能简化为相对于自然老化的单纯年龄变化。我们认为,这是可解释的弹性辅助小学(线圈$\to$螺旋)的本地事件,其动态逐渐放缓,随着年龄的增长几何挫折。

英文摘要:

We show that the aging of the mechanical relaxation of a gelatin gel exhibits the same scaling phenomenology as polymer and colloidal glasses. Besides, gelatin is known to exhibit logarithmic structural aging (stiffening). We find that stress accelerates this process. However, this effect is definitely irreducible to a mere age shift with respect to natural aging. We suggest that it is interpretable in terms of elastically-aided elementary (coil$\to$helix) local events whose dynamics gradually slows down as aging increases geometric frustration.

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