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arXiv 1605.00599cond-mat.softphysics.flu-dyn
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球形凝胶中溶胀与干燥的动力学

Dynamics of swelling and drying in a spherical gel

Thibault Bertrand, Jorge Peixinho, Shomeek Mukhopadhyay, Christopher W. MacMinn

AI总结:

本文通过大变形孔隙力学模型与聚丙烯酰胺球体实验,研究了球形水凝胶溶胀与干燥的瞬态内部动力学,揭示了两种过程的本质差异及干燥断裂风险。

摘要:

溶胀是一种体积增长过程,其中多孔材料通过自发吸入额外的孔隙流体而膨胀。溶胀与其他增长过程的不同之处在于其本质上是孔隙力学的:孔隙结构的局部膨胀需要从材料其他部分抽取额外流体,或使流体从边界进入材料内部。本文研究了水凝胶球体的溶胀及其后续干燥过程。我们基于大变形孔隙力学和理想弹性体凝胶理论建立了一个动力学模型,并将该模型的预测结果与使用聚丙烯酰胺球体进行的一系列实验进行了比较。我们利用该模型和实验研究了溶胀与干燥过程中复杂的内部动力学,并强调了这些截然不同过程本质上的瞬态特性。尽管我们假设了球对称性,该模型仍能提供关于溶胀过程中形成然后消失的瞬态图案以及干燥过程中断裂风险的深入认识。

英文摘要:

Swelling is a volumetric-growth process in which a porous material expands by spontaneous imbibition of additional pore fluid. Swelling is distinct from other growth processes in that it is inherently poromechanical: Local expansion of the pore structure requires that additional fluid be drawn from elsewhere in the material, or into the material from across the boundaries. Here, we study the swelling and subsequent drying of a sphere of hydrogel. We develop a dynamic model based on large-deformation poromechanics and the theory of ideal elastomeric gels, and we compare the predictions of this model with a series of experiments performed with polyacrylamide spheres. We use the model and the experiments to study the complex internal dynamics of swelling and drying, and to highlight the fundamentally transient nature of these strikingly different processes. Although we assume spherical symmetry, the model also provides insight into the transient patterns that form and then vanish during swelling as well as the risk of fracture during drying.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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