Viscometer using drag force measurements

Noël, M. H.; Semin, Benoît; Hulin, Jean-Pierre; Auradou, Harold

doi:10.1063/1.3556445

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…Depending on whether pressure or a given flow rate is imposed for measurement, microviscometers are generally categorized into two groups [13]. In the first group, the flow rate of the liquid is controlled by an external pressure gradient source such as a syringe pump [13,[33][34][35][36]. Inversely, in the second group, similar to capillary driven flow-based microviscometers, viscosity is obtained by measuring the velocity of the meniscus of the liquid in the microchannel [13,19,28,37].…”

Section: Introductionmentioning

confidence: 99%

Capillary-based micro-optofluidic viscometer

Bamshad

Nikfarjam

Sabour

2018

Meas. Sci. Technol.

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In this study, a capillary-based micro-optofluidic viscometer, which is capable of measuring dynamic viscosity in a range of 0.5 mPa s-50 mPa s with only a small volume of liquid (26 µl) in just a few seconds (less than 15 s for most of the samples used) with an acceptable accuracy (99.56%), has been designed, fabricated, and tested. This device consists of two different parts, namely a poly(methyl methacrylate) (PMMA) microfluidic chip and an electro-optical detection system. The viscometer determines viscosity by measuring the time that the liquid travels between two specific points of a rectangular microchannel. The microchannel has been micro-milled on a PMMA substrate, which has been bonded to another PMMA sheet. The fluid flow inside the microfluidic chip has been created by the capillary driven flow; hence, there is no need for any external devices to generate fluid flow. The resolution of this microviscometer is approximately 0.001 mPa s. An ADC circuit has been added to the electro-optical detection system, which is an optically-activated stopwatch circuit, to enhance accuracy, sensitivity, resolution, and to make this viscosity measurement device applicable and efficient for a wide range of applications. This integrated microviscometer automatically notices entry of liquid and completion of the experiment, and finally gives the result. In this study, only Newtonian fluids were tested via this microviscometer, but this device is also capable of measuring non-Newtonian liquids. This portable microviscometer has applications in different fields such as point-of-care diagnosis, chemical and food industries, pharmaceutical industries, research laboratories, etc.

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Section: Introductionmentioning

confidence: 99%

Capillary-based micro-optofluidic viscometer

Bamshad

Nikfarjam

Sabour

2018

Meas. Sci. Technol.

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“…25,26 Based on the method to apply the flow in a microchannel, these viscometers can be generally categorized into two groups, depending on whether a given pressure or a given flow rate is imposed during the measurement. In many microfluidic-based viscometers, 19,[25][26][27][28] the flow rate is controlled using a syringe pump; however, this method requires a relatively large amount of liquid (e.g., >20 μL) to achieve a stable flow. 18,19 Conversely, capillary-pressure-driven flow has been used to measure liquid viscosity by measuring the velocity of a meniscus filling in a microchannel.…”

Section: Introductionmentioning

confidence: 99%

Viscosity measurement based on the tapping-induced free vibration of sessile droplets using MEMS-based piezoresistive cantilevers

et al. 2015

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We report a simple technique to measure the free vibration of microlitre-sized droplets using an array of thirteen MEMS-based piezoresistive cantilevers and demonstrate its application for the measurement of viscosity. Because the damping of the free vibration of a liquid droplet is known to be affected by the viscosity of the liquid, measuring the vibration of a droplet allows the viscosity to be estimated from a dilute sample volume. However, conventional methods to measure the droplet vibration require sophisticated apparatuses, which hinder the development of a portable viscometer. Here, we show that MEMS-based piezoresistive cantilevers can be an excellent tool to measure the vibration of a sessile droplet due to the high sensitivity and simplicity of the readout scheme. Using the cantilever array, we analyse the normal force distribution on the contact area of a sessile droplet in the static state and during the vibration. Next, we show that the viscosity (from ~1-30 mPa s) can be estimated within an error of less than 10% from the attenuation rate of the cantilever output during the tapping-induced vibration of small droplets (~2.4 μL). In addition to the advantage of the small sample volume, the proposed viscometer has simple operation and readout schemes, which are desirable for many applications, including point-of-care testing and drug development.

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“…8,16 The viscosity range accessible with these viscometers is 1 × 10 −3 −1 × 10 2 Pa•s. 7,13,15,17 In addition, traditional viscometers often have complicated setups and are expensive. Therefore, a low-cost and simple viscometer setup that requires only small sample volumes is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

“…These various viscometry methods have in common that they contain the liquid they are measuring. As a result, the sample volumes required for measurements range from a few nanoliters to several milliliters. , The viscosity range accessible with these viscometers is 1 × 10 –3 –1 × 10 2 Pa·s. ,,, In addition, traditional viscometers often have complicated setups and are expensive. Therefore, a low-cost and simple viscometer setup that requires only small sample volumes is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Viscosity-Dependent Janus Particle Chain Dynamics

Ren

Kretzschmar

2013

Langmuir

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Iron oxide (Fe3O4) Janus particles assemble into staggered chains parallel to the field lines in an ac electric field. Subsequent application of an external magnetic field leads to contraction of the staggered chains into double chains. The relation between the viscosity of the surrounding solution and the contraction rate of the iron oxide Janus particle chains is studied. Further, the influence of particle size and chain length (i.e., number of particles in chain) on the contraction rate is investigated. The base material for the Janus structure is silica (SiO2) with particle sizes of 1, 2, and 4 μm, and the cap material is Fe3O4. Addition of increasing amounts of glycerol to the aqueous system reveals that the contraction dynamics strongly correlate with the viscosity of the solution. The average chain contraction rate for each particle size can be fitted in the low viscosity range from 1 to 30 mPa·s with a power function of the form A/μ(0.9) - B/μ, in which the coefficients A and B are particle size, electric field, and magnetic-field-dependent constants. Using this function, the viscosity of an unknown solution can be determined, thereby pointing to the potential application of these Janus particle chain assemblies as in situ microviscometers.

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Viscometer using drag force measurements

Cited by 13 publications

References 15 publications

Capillary-based micro-optofluidic viscometer

Capillary-based micro-optofluidic viscometer

Viscosity measurement based on the tapping-induced free vibration of sessile droplets using MEMS-based piezoresistive cantilevers

Viscosity-Dependent Janus Particle Chain Dynamics

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