Carbonaro Alessandro, Chagua-Encarnacion Kennedy-Nexon, Charles Carole-Ann, Phou Ty, Ligoure Christian, Mora Serge, Truzzolillo Domenico
Laboratoire Charles Coulomb, Université de Montpellier and CNRS, F-34095 Montpellier, France.
Laboratoire de Mécanique et Génie Civil, Université de Montpellier and CNRS, F-34090 Montpellier, France.
Soft Matter. 2020 Sep 23;16(36):8412-8421. doi: 10.1039/d0sm01024c.
Large deformations of soft elastic beads spinning at high angular velocity in a denser background fluid are investigated theoretically, numerically, and experimentally using millimeter-size polyacrylamide hydrogel particles introduced in a spinning drop tensiometer. We determine the equilibrium shapes of the beads from the competition between the centrifugal force and the restoring elastic and surface forces. Considering the beads as neo-Hookean up to large deformations, we show that their elastic modulus and interfacial energy constant can be simultaneously deduced from their equilibrium shape. Also, our results provide further support to the scenario in which interfacial energy and interfacial tension coincide for amorphous polymer gels.
利用引入旋转滴张力仪中的毫米级聚丙烯酰胺水凝胶颗粒，从理论、数值和实验三方面研究了在密度更大的背景流体中高速旋转的软弹性珠粒的大变形情况。我们根据离心力与弹性恢复力和表面力之间的竞争关系来确定珠粒的平衡形状。考虑到珠粒在大变形情况下仍为新胡克体，我们表明可以从其平衡形状同时推导出它们的弹性模量和界面能常数。此外，我们的结果进一步支持了非晶态聚合物凝胶的界面能与界面张力一致的观点。
