Particle tracking microrheology of complex fluids
Particle tracking microrheology of complex fluids
复制标题
DOI：
10.1103/physrevlett.79.3282
复制
发表时间：
1997-10-27
影响因子：
8.6
通讯作者：
Kuo, SC
中科院分区：
文献类型：
--
作者：
Mason, TG;Ganesan, K;Kuo, SC
提出了一种测量复杂流体线粘弹性剪切模量的新方法。使用光电二极管检测从热激发的胶体探针球散射的激光，我们跟踪其轨迹，并使用依赖于频率的斯托克斯-爱因斯坦方程提取的模量。聚环氧乙烷在水中获得的光谱与机械和使用扩散波光谱学发现的光谱非常一致。由于只需要微小的样品体积，这种方法非常适合高纯度的生物材料，因为我们用浓缩的DNA溶液证明。
We present a new method for measuring the linear viscoelastic shear moduli of complex fluids. Using photodiode detection of laser light scattered from a thermally excited colloidal probe sphere, we track its trajectory and extract the moduli using a frequency-dependent Stokes-Einstein equation. Spectra obtained for polyethylene oxide in water are in excellent agreement with those found mechanically and using diffusing wave spectroscopy. Since only minute sample volumes are required, this method is well suited for biomaterials of high purity, as we demonstrate with a concentrated DNA solution.