论文标题
微流体原位测量泊松的水凝胶比率
Microfluidic In Situ Measurement of Poisson's Ratio of Hydrogels
论文作者
论文摘要
能够精确地表征软微粒的机械性能对于从对生物流体流动到软微型机器人的发展的多种情况至关重要。在这里，我们提供了一种简单的测量技术，可用于在存在周围液体的情况下泊松的软微米大小水凝胶的比率。这种方法依赖于在微流体通道内单轴压缩的矩形水凝胶板的两个正交方向的变形的测量。由于该方法的原位特征，不需要干燥样品，因此可以测量肿胀水凝胶的机械性能。使用这种方法，我们确定了由聚乙烯乙二醇（PEG）组成的水凝胶颗粒的比率和使用光刻技术制造的变化溶剂。结果表明，水凝胶可压缩性对溶剂分数和特征的依赖性。该方法易于实现，可以适应各种软和生物材料的测量。
Being able to precisely characterize the mechanical properties of soft microparticles is essential for numerous situations from the understanding of the flow of biological fluids to the development of soft micro-robots. Here we present a simple measurement technique for the Poisson's ratio of soft micron-sized hydrogels in the presence of a surrounding liquid. This methods relies on the measurement of the deformation in two orthogonal directions of a rectangular hydrogel slab compressed uni-axially inside a microfluidic channel. Due to the in situ character of the method, the sample does not need to be dried, allowing for the measurement of the mechanical properties of swollen hydrogels. Using this method we determine the Poisson's ratio of hydrogel particles composed of polyethylene glycol (PEG) and varying solvents fabricated using a lithography technique. The results demonstrate with high precision the dependence of the hydrogel compressibility on the solvent fraction and character. The method, easy to implement, can be adapted for the measurement of a variety of soft and biological materials.
