Jorjadze Ivane, Pontani Lea-Laetitia, Brujic Jasna
Center for Soft Matter Research, Physics Department, New York University, 4 Washington Place, New York, New York 10003, USA.
Phys Rev Lett. 2013 Jan 25;110(4):048302. doi: 10.1103/PhysRevLett.110.048302. Epub 2013 Jan 23.
Using confocal microscopy, we measure the packing geometry and interdroplet forces as a function of the osmotic pressure in a 3D emulsion system. We assume a harmonic interaction potential over a wide range of volume fractions and attribute the observed nonlinear elastic response of the pressure with density to the first corrections to the scaling laws of the microstructure away from the critical point. The bulk modulus depends on the excess contacts created under compression, which leads to the correction exponent α=1.5. Microscopically, the nonlinearities manifest themselves as a narrowing of the distribution of the pressure per particle as a function of the global pressure.
使用共聚焦显微镜，我们测量了三维乳液系统中堆积几何结构和液滴间作用力随渗透压的变化。我们假设在较宽的体积分数范围内存在谐波相互作用势，并将观察到的压力随密度的非线性弹性响应归因于远离临界点时微观结构标度律的一阶修正。体积模量取决于压缩时产生的额外接触，这导致修正指数α = 1.5。从微观角度看，非线性表现为单个粒子压力分布随全局压力变窄。
