论文标题
旋转弹性珠：同时测量剪切模量和软材料界面能的途径
Spinning elastic beads: a route for simultaneous measurements of shear modulus and interfacial energy of soft materials
论文作者
论文摘要
在理论上，数值和实验上使用毫米大小的聚丙烯酰胺水凝胶颗粒在较密集的背景流体中以高角度速度旋转的软弹性珠的大变形进行了研究。我们确定了离心力与恢复弹性和表面力之间竞争的珠子的平衡形状。将珠子视为新的幽门，直到大变形，我们表明它们的弹性模量和表面能量常数可以同时从它们的平衡形状中推导。同样，我们的结果为无形聚合物凝胶的表面能量和表面张力重合的情况提供了进一步的支持。
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 surface energy constant can be simultaneously deduced from their equilibrium shape. Also, our results provide further support to the scenario in which surface energy and surface tension coincide for amorphous polymer gels.
