Viscosity coefficients of microfluids-Newtonian and non-Newtonian-were explored through the rotational motion of a particle trapped by optical tweezers in a microflute. Unlike conventional methods based on viscometers, our microfluidic system employs samples of less than 30 µl to complete a measurement. Viscosity coefficients of ethanol and fetal bovine serum, as typical examples of Newtonian and non-Newtonian fluids, were obtained experimentally, and found to be in excellent agreement with theoretical predictions. Additionally, a practical application to a DNA solution with incremental ethidium bromide content was employed and the results are consistent with clinical data, indicating that our system provides a potentially important complementary tool for use in such biological and medical applications.

中文翻译：

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用动态光镊系统测量微流体的微观粘度

通过光学镊子在微槽中捕获的粒子的旋转运动来探索微流体（牛顿和非牛顿）的粘度系数。与基于粘度计的传统方法不同，我们的微流体系统使用小于 30 µl 的样品来完成测量。作为牛顿流体和非牛顿流体的典型例子，乙醇和胎牛血清的粘度系数是通过实验获得的，发现与理论预测非常吻合。此外，还对具有增量溴化乙锭含量的 DNA 溶液进行了实际应用，结果与临床数据一致，表明我们的系统为此类生物和医学应用提供了潜在的重要补充工具。