论文标题
使用高速统计粒子微流变学测量稀聚合物溶液的粘弹性行为
Measuring the viscoelastic behavior of dilute polymer solutions using high-speed statistical particle microrheology
论文作者
论文摘要
聚合物溶液的粘弹性通常是使用振荡剪切流变计测量的，但是，这种方法的准确性受设备的振荡频率的限制，并且由于稀聚合物溶液的松弛时间很短，因此需要在非常高的频率下进行测量。已经提出了微流行病来克服这一技术挑战。然而，用于解决微流变中粒子位移统计的设备很昂贵。在这项工作中，我们使用传统的荧光显微镜与高速加强摄像机结合的传统荧光显微镜测量了甲壳溶液的粘弹性行为。统计粒子跟踪用于分析分散颗粒的均方位移。据报道，在0.063-0.5％之间的甲基溶液中，据报道，放松时间为0.76-9.00毫秒和粘弹性模量，G'11.34至3.39之间。
The viscoelastic behavior of polymer solutions is commonly measured using oscillating shear rheometry, however, the accuracy of such methods is limited by the oscillating frequency of the equipment and since the relaxation time of the dilute polymer solutions is short, this requires measurement at very high frequencies. Microrheology has been proposed to overcome this technical challenge. Yet the equipment for resolving the statistics of particle displacements in microrheology is expensive. In this work, we measured the viscoelastic behavior of Methocel solutions at various concentrations using a conventional epi-fluorescence microscope coupled to a high-speed intensified camera. Statistical Particle Tracking is used in analyzing the mean-squared displacement of the dispersive particles. Relaxation times ranging from 0.76 - 9.00 ms and viscoelastic moduli, G' between 11.34 and 3.39 are reported for Methocel solutions of concentrations between 0.063 - 0.5%
