Liu J, Koenderink G H, Kasza K E, Mackintosh F C, Weitz D A
Department of Physics & SEAS, Harvard University, Cambridge, MA 02138, USA.
Phys Rev Lett. 2007 May 11;98(19):198304. doi: 10.1103/PhysRevLett.98.198304. Epub 2007 May 10.
We image semiflexible polymer networks under shear at the micrometer scale. By tracking embedded probe particles, we determine the local strain field, and directly measure its uniformity, or degree of affineness, on scales of 2-100 microm. The degree of nonaffine strain depends upon the polymer length and cross-link density, consistent with theoretical predictions. We also find a direct correspondence between the uniformity of the microscale strain and the nonlinear elasticity of the networks in the bulk.
我们在微米尺度下对剪切作用下的半柔性聚合物网络进行成像。通过追踪嵌入的探针粒子，我们确定了局部应变场，并在2 - 100微米的尺度上直接测量其均匀性或仿射度。非仿射应变程度取决于聚合物长度和交联密度，这与理论预测一致。我们还发现微观尺度应变的均匀性与网络整体的非线性弹性之间存在直接对应关系。
