An instrument for precise measurement of viscoelastic properties of low viscosity dilute macromolecular solutions at frequencies from 20 to 500 kHz

Stokich, T. M.; Radtke, Douglas R.; White, Christopher C.; Schrag, John L.

doi:10.1122/1.550608

Cited by 34 publications

(21 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to obtain both amplitude and phase of a complex material, two independent measures of the sample's contribution are analysed: the shift in resonance frequency f r and a damping factor. The latter is generally derived via the broadening of the resonance curve Δf (Stokich et al 1994;Bergenholtz et al 1998b). The Q-factor…”

Section: Bulk Resonators and Immersed Rheometersmentioning

confidence: 99%

Bulk rheometry at high frequencies: a review of experimental approaches

et al. 2019

View full text Add to dashboard Cite

High-frequency rheology is a form of mechanical spectroscopy which provides access to fast dynamics in soft materials and hence can give valuable information about the local scale microstructure. It is particularly useful for systems where timetemperature superposition cannot be used, when there is a need to extend the frequency range beyond what is possible with conventional rotational devices. This review gives an overview of different approaches to high-frequency bulk rheometry, i.e. mechanical rheometers that can operate at acoustic (20 Hz-20 kHz) or ultrasound (> 20 kHz) frequencies. As with all rheometers, precise control and know-how of the kinematic conditions are of prime importance. The inherent effects of shear wave propagation that occur in oscillatory measurements will hence be addressed first, identifying the gap and surface loading limits. Different high-frequency techniques are then classified based on their mode of operation. They are reviewed critically, contrasting ease of operation with the dynamic frequency range obtained. A comparative overview of the different types of techniques in terms of their operating window aims to provide a practical guide for selecting the right approach for a given problem. The review ends with a more forward looking discussion of selected material classes for which the use of high-frequency rheometry has proven particularly valuable or holds promise for bringing physical insights.

show abstract

Section: Bulk Resonators and Immersed Rheometersmentioning

confidence: 99%

Bulk rheometry at high frequencies: a review of experimental approaches

et al. 2019

View full text Add to dashboard Cite

show abstract

“…When making the plate thick enough to support a resonance in the kHz range, its lateral dimensions are driven into the range of tens of centimeters. A more practical geometry is the torsional rod [20]. With torsional resonators, the frequency is set by the length of the rod.…”

Section: Resonators Operating In the Khz Rangementioning

confidence: 99%

Other Surface-Acoustic-Wave Based Instruments

Johannsmann

2014

The Quartz Crystal Microbalance in Soft Matter Research

View full text Add to dashboard Cite

There is a variety of sensing instruments making use of acoustic waves (often shear waves) near interfaces. Among the concepts shared between the QCM and these instruments are the mass sensitivity and the acoustic reflectivity as a central intermediate parameter. The kHz resonators measure viscoelastic parameters at frequencies more relevant to most applications than MHz frequencies. On the other hand, they are less sensitive. Smaller resonators operating at higher frequencies tend to have better mass-sensitivity. Shear-Wave ReflectometersThe shear-wave reflectometer dates from the time when acoustic sensing started. It has seen numerous developments and extensions since then. Figure 15

show abstract

“…12,13 They have mostly been used to determine the viscosity of complex media at high frequencies. 14,15,16,17 We describe the application of torsional resonators for measurements of film thickness and for the monitoring of biofouling. Details of the modeling are provided in Ref.…”

Section: Modelingmentioning

confidence: 99%

Use of Torsional Acoustic Resonators for Microweighing, Polymer Rheology, and Monitoring of Biofilm Formation

Bücking

Turshatov

et al. 2007

2007 IEEE International Frequency Control Symposium Joint With the 21st European Frequency and Time Forum

View full text Add to dashboard Cite

The work describes the use of readily available and economical quartz crystal torsional resonators for microweighing.The resonance behavior was probed by impedance analysis.Torsional resonators are straightforwardly adapted to the detection electronics usually employed for driving a quartz crystal microbalance. The analysis proceeds as with quartz crystal resonators.The measurement of the viscoelastic parameters of a silicone oil gave results consistent with the corresponding low-frequency data. Thickness determinations on a film formed from a polymer dispersion have confirmed that torsional resonators indeed function as microbalances when the sample is thin enough. Biofilm formation is easily monitored, as well.

show abstract

An instrument for precise measurement of viscoelastic properties of low viscosity dilute macromolecular solutions at frequencies from 20 to 500 kHz

Cited by 34 publications

References 18 publications

Bulk rheometry at high frequencies: a review of experimental approaches

Bulk rheometry at high frequencies: a review of experimental approaches

Other Surface-Acoustic-Wave Based Instruments

Use of Torsional Acoustic Resonators for Microweighing, Polymer Rheology, and Monitoring of Biofilm Formation

Contact Info

Product

Resources

About