Simultaneous measurement of rheological properties in a microfluidic rheometer
Simultaneous measurement of rheological properties in a microfluidic rheometer
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DOI：
10.1063/5.0006060
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发表时间：
2020-05-01
影响因子：
4.6
通讯作者：
Del Giudice, Francesco
中科院分区：
文献类型：
--
作者：
Del Giudice, Francesco
微流变学被认为是一种潜在的替代传统流变学的方法，用于表征粘弹性相对较低的粘弹性溶液的流变性。然而，到目前为止推出的微流控平台都不能用于在同一装置中测量多种流变性。在这项工作中，我提出了第一个微流控平台，称为“Mu-流变仪”，它允许同时测量零剪切粘度Eta(0)和最长剪切松弛时间Lambda。这是通过将Del Giudice等人提出的原始“流量控制”平台改造成“压降控制”微流控装置实现的，该平台由Del Giudice等人提出，题为“单芯片流变学：通过微通道流动中的颗粒迁移测量粘弹性液体的松弛时间”(Lab Chip 15,783-792(2015))，方法是用加压泵取代注射泵。新的装置已经通过测量一些聚氧乙烷溶液在甘油水25wt.%和纯水中的Eta(0)和Lambda进行了测试。通过与传统旋转流变仪的直接比较，证实了它的有效性。
Microfluidic rheometry is considered to be a potential alternative to conventional rheometry for the rheological characterization of viscoelastic solutions having relatively low viscoelastic properties. None of the microfluidic platforms introduced so far, however, can be used for the measurements of multiple rheological properties in the same device. In this work, I present the first microfluidic platform, named the "mu -rheometer," which allows for the simultaneous measurement of zero-shear viscosity eta (0) and longest shear relaxation time lambda. This is achieved by transforming the original "flow rate controlled" platform presented by Del Giudice et al., "Rheometry-on-a-chip: Measuring the relaxation time of a viscoelastic liquid through particle migration in microchannel flows," Lab Chip 15, 783-792 (2015) into a "pressure drop controlled" microfluidic device, by replacing a syringe pump with a pressure pump. The novel device has been tested by measuring both eta (0) and lambda for a number of polyethylene oxide solutions in glycerol-water 25 wt. % and pure water, respectively. Its effectiveness has been corroborated by means of a direct comparison with a conventional rotational rheometer.