A Drop-on-Micropillars (DOM)-Based Acoustic Wave Viscometer for High Viscosity Liquid Measurement
A Drop-on-Micropillars (DOM)-Based Acoustic Wave Viscometer for High Viscosity Liquid Measurement
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DOI：
10.1109/jsen.2023.3309757
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发表时间：
2023-10
影响因子：
4.3
通讯作者：
Ilia Chiniforooshan Esfahani;Siqi Ji;Hongwei Sun
中科院分区：
文献类型：
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作者：
Ilia Chiniforooshan Esfahani;Siqi Ji;Hongwei Sun
高粘度测量对于食品制造、药物开发和生物医学诊断等应用至关重要。基于振动的粘度测量设备由于其便携性、成本效率和低样品消耗而变得越来越受欢迎。然而，在测量高粘度液体时，由于振动结构上的流体动力载荷增加，它们存在灵敏度低、阻尼和噪声水平高等缺点。在这项工作中，开发了一种新颖的微柱液滴（DOM）概念，通过利用非润湿状态（Cassie状态）微柱阵列上的液滴来提高用于高粘度测量的振动粘度计的灵敏度并降低阻尼。同时，微柱与声波基底（$\mu$PAW）——石英晶体谐振器（QCR）之间独特的谐振现象可以显着提高原有声波器件的灵敏度。 DOM概念是通过热纳米压印光刻（T-NIL）在QCR表面上制造聚甲基丙烯酸甲酯（PMMA）微柱来实现的，然后通过化学气相沉积（CVD）技术对柱表面进行改性以产生超疏水微柱表面。对于粘度范围为 3 至 91.4 cP 的去离子水和甘油水溶液，测量了器件的谐振频移和品质因数。结果表明，DOM装置可以实现高灵敏度粘性液体的测量，同时将品质因数（能量耗散）保持在可接受的水平内。
High viscosity measurement is critical for applications such as food manufacturing, drug development, and biomedical diagnostics. Vibration-based viscosity measurement devices have become increasingly popular due to their portability, cost efficiency, and low sample consumption. However, they suffered drawbacks such as low sensitivity and high damping and noise levels when measuring high-viscosity liquids due to the increased hydrodynamic loading on the vibrating structures. In this work, a novel drop-on-micropillar (DOM) concept is developed to improve the sensitivity and reduce the damping of the vibrational viscometers for high viscosity measurement by taking advantage of a liquid drop on a micropillar array under non-wetting state—Cassie state. In the meantime, the unique resonance phenomena between micropillars and acoustic wave substrate ( $\mu $ PAW)—quartz crystal resonator (QCR) can significantly improve the sensitivity of the original acoustic wave device. The DOM concept was realized by fabricating polymethyl methacrylate (PMMA) micropillars on a QCR surface by thermal nanoimprinting lithography (T-NIL), and the pillar surface was then modified through a chemical vapor deposition (CVD) technique to yield a superhydrophobic micropillar surface. The resonance frequency shift and quality factor of the devices were measured for deionized water and aqueous glycerol solution with viscosity ranging from 3 to 91.4 cP. The results show that the DOM device can achieve the measurement of viscous liquids at a high sensitivity while maintaining the quality factor (energy dissipation) within an acceptable level.