Characterizing the rheological behavior of oil-based liquids: microacoustic sensors versus rotational viscometers

Kuntner, J.; Stangl, G.; Jakoby, Bernhard

doi:10.1109/jsen.2005.851010

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…As a result, the AMBR microviscometer is a versatile platform that can be used with any bacterial strain. Other methods to measure viscosity at small volumes include viscosity sensitive dyes, microacoustic sensors, cantilevers, and depolarization fluorescence spectroscopy. − However, in contrast to the reported AMBR microviscometer here, these systems typically require larger volumes, chemical or physical labeling, and/or expensive or complex equipment. The individual AMBR viscometers are encapsulated in microfluidic water-in-oil (w/o) nanoliter droplets, and AST may be performed with an initial bacterial count of 50, or fewer, cells per droplet.…”

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confidence: 99%

Asynchronous Magnetic Bead Rotation Microviscometer for Rapid, Sensitive, and Label-Free Studies of Bacterial Growth and Drug Sensitivity

et al. 2012

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The long turnaround time in antimicrobial susceptibility testing (AST) endangers patients and encourages the administration of wide spectrum antibiotics, thus resulting in alarming increases of multi-drug resistant pathogens. A method for faster detection of bacterial proliferation presents one avenue towards addressing this global concern. We report on a label-free asynchronous magnetic bead rotation (AMBR) based viscometry method that rapidly detects bacterial growth and determines drug sensitivity by measuring changes in the suspension’s viscosity. With this platform, we observed the growth of a uropathogenic Escherichia coli isolate, with an initial concentration of 50 cells per drop, within 20 minutes; in addition, we determined the gentamicin minimum inhibitory concentration (MIC) of the E. coli isolate within 100 minutes. We thus demonstrated a label-free, micro-viscometer platform that can measure bacterial growth and drug susceptibility more rapidly, with lower initial bacterial counts than existing commercial systems, and potentially with any microbial strains.

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confidence: 99%

Asynchronous Magnetic Bead Rotation Microviscometer for Rapid, Sensitive, and Label-Free Studies of Bacterial Growth and Drug Sensitivity

et al. 2012

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“…Therefore, automatic analyzers for continuous measurement of kinematic viscosity and fluid density with high metrological characteristics cannot be built on their basis. In addition, the accuracy of measurement is significantly affected by pressure [24] and non-Newtonian behavior of the tested fluid [25], as well as the influence of external vibrations.…”

Section: Methodsmentioning

confidence: 99%

Developing and Investigating the Analyzers of Kinematic Viscosity and Density of Petroleum Products on Throttle Bridge Transducers

et al. 2021

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Measuring the viscosity and density of petroleum products is important for their proper production, transportation and application. Viscosity and density are the main parameters determining the composition and structure of petroleum products. Therefore, in the industry, to control the quality of petroleum products during various technological processes, automatic and non-automatic devices are used for their measurement. The accuracy of measuring the viscosity and density of petroleum products is an important factor. The authors analyzed different methods of measuring the viscosity and density of petroleum products and synthesized three versions of throttle bridge transducers. These versions implement differential measurement methods and have different numbers of laminar and turbulent throttles. The authors obtained new equations of static conversion functions by channels of measuring the kinematic viscosity and density of petroleum products of the proposed throttle bridge transducers. The authors developed a block diagram and designed measuring equipment to study experimentally the static characteristics of the throttle bridge transducers. The authors determined that the maximal relative deviations of the results of experimental studies from numerical calculations of a static conversion factor by channels of kinematic viscosity and density were 5.88% and 8.76%, respectively. The authors developed two versions of automatic devices for measuring the kinematic viscosity and density of petroleum products based on the proposed throttle bridge transducers. The first version is an automatic analyzer with tracking astatic balancing. The second version is an automatic analyzer with deployment balancing. The authors developed constructions of both versions of automatic analyzers and obtained the results of experimental measuring of the kinematic viscosity and density of petroleum products in different ranges.

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“…A crucial parameter characterizing the flow of viscous liquids is the viscosity (more precisely the ''shear viscosity'') of a liquid, which can be defined in terms of a simple experimental arrangement, where the liquid under test is sheared between two laterally moving plates (see Fig. 1, see also (Kuntner, Stangl, Jakoby, 2005)). The viscosity is then defined as the ratio between the applied shear stress (maintaining the movement) and the resulting gradient of the flow velocity v (i.e.…”

Section: Rheology In a Nutshellmentioning

confidence: 99%

Condition monitoring of viscous liquids using microsensors

Jakoby

Reichel

Riesch

et al. 2009

Elektrotech. Inftech.

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Vibrating microsensors offer possibilities for the monitoring of viscous substances in industrial processes online. In this contribution we review our recent work on suitable sensing technologies and the associated impact in terms of the probed rheological domains. Furthermore, selected applications, i.e. the sensing of engine oil and the monitoring of zeolite synthesis aboard the ISS are described.

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Characterizing the rheological behavior of oil-based liquids: microacoustic sensors versus rotational viscometers

Cited by 12 publications

References 15 publications

Asynchronous Magnetic Bead Rotation Microviscometer for Rapid, Sensitive, and Label-Free Studies of Bacterial Growth and Drug Sensitivity

Asynchronous Magnetic Bead Rotation Microviscometer for Rapid, Sensitive, and Label-Free Studies of Bacterial Growth and Drug Sensitivity

Developing and Investigating the Analyzers of Kinematic Viscosity and Density of Petroleum Products on Throttle Bridge Transducers

Condition monitoring of viscous liquids using microsensors

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