An acoustic characterization of polymethyl methacrylate and three epoxy formulations

Sutherland, Herbert J.; Lingle, R.

doi:10.1063/1.1660868

Cited by 41 publications

(8 citation statements)

References 6 publications

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“…Note that in the case of PMMA we have used representative average values based on Refs. [47][48][49][50][51][52]. Material parameters at 25 • C for water and 10-µm-diameter polystyrene tracer particles are listed in Table II.…”

Section: Geometry and Materialsmentioning

confidence: 99%

Whole-System Ultrasound Resonances as the Basis for Acoustophoresis in All-Polymer Microfluidic Devices

Moiseyenko

Bruus

2019

Phys. Rev. Applied

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Using a previously well-tested numerical model, we demonstrate theoretically that good acoustophoresis can be obtained in a microchannel embedded in an acoustically soft, all-polymer chip, by excitation of whole-system ultrasound resonances. In contrast to conventional techniques based on a standing bulk acoustic wave inside a liquid-filled microchannel embedded in an elastic, acoustically hard material, such as glass or silicon, the proposed whole-system resonance does not need a high acoustic contrast between the liquid and surrounding solid. Instead, it relies on the very high acoustic contrast between the solid and the surrounding air. In microchannels of usual dimensions, we demonstrate the existence of whole-system resonances in an all-polymer device, which support acoustophoresis of a quality fully comparable to that of a conventional hard-walled system. Our results open up for using cheap and easily processable polymers in a controlled manner to design and fabricate microfluidic devices for single-use acoustophoresis. arXiv:1809.05087v1 [physics.flu-dyn]

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Section: Geometry and Materialsmentioning

confidence: 99%

Whole-System Ultrasound Resonances as the Basis for Acoustophoresis in All-Polymer Microfluidic Devices

Moiseyenko

Bruus

2019

Phys. Rev. Applied

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“…In general no standard parameters are employed to describe the material properties using ultrasound. For example several authors just use sound velocity and attenuation24 to describe the elastic modulus whereas others prefer the longitudinal modulus, real part of the complex Poisson's ratio,44–46 phase and group velocities,47, 48 relaxation times,49, 50 attenuation per wavelength,51, 52 real and imaginary part of the complex modulus53–56 and tan δ [tan δ is defined as the ratio of the energy dissipated per cycle to the maximum potential energy stored during a cycle] 57. It is interesting to note from the publishing years that up to the present day this wide distribution concerning the choice of acoustic parameters employed still exists.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic properties of polystyrene‐based composites

Oral

Güzel

Ahmetli

2012

J of Applied Polymer Sci

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In this study, first the pure polystyrenes (PS) with different molecular weights (350 Â 10 3 and 500 Â 10 3 ) have been modified by the chemical modification with succinic anhydride (SA), maleic anhydride (MA), and phthalic anhydride (PhA) and then the polystyrene based composites (CPS) prepared by addition of modified polystyrenes (MPS) into pure PS (with the molecular weight of 230 Â 10 3 ) in weight % ratios of 90 : 10, 80 : 20, and 70 : 30. Ultrasonic measurements were performed on PS/MPS blends of different weight percent of MPSs by use of pulse echo method with 5-MHz frequency at room temperature. Elastic properties namely; longitudinal modulus (L), Young's modulus (E), bulk modulus (K) and shear modulus (G), Poisson's ratio (l), and acoustic impedance (Z) were calculated from the ultrasonic velocities values measured and densities values obtained experimentally. Atomic force microscopy (AFM) has been used for determining the microstructure of composites. The variations of these parameters with increasing MPSs weight percentage content in PS/MPS from 10 to 30 have been discussed.

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“…Then, coarse fitting of the p pmma i is performed in the range 500 Hz < f i < 1 MHz with ∆f = 2 kHz stepping, taking the initial values to be the average values of Refs. [30][31][32][33][34][35][36]. Lastly, a final fitting of p pmma i is done in the the range 3.5 MHz < f i < 5 MHz combined with previous range using steps of ∆f = 10 kHz.…”

Section: The Ueis Fitting Proceduresmentioning

confidence: 99%

Determination of the complex-valued elastic moduli of polymers by electrical impedance spectroscopy for ultrasound applications

Bodé¹,

Lickert²,

Augustsson³

et al. 2022

Preprint

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A method is presented for the determination of complex-valued compression and shear elastic moduli of polymers for ultrasound applications. The resulting values, which are scarcely reported in the literature, are found with uncertainties typically around 1% (real part) and 6% (imaginary part). The method involves a setup consisting of a cm-radius, mm-thick polymer ring glued concentrically to a disk-shaped piezoelectric transducer. The ultrasound electrical impedance spectrum of the transducer is computed numerically and fitted to measured values as an inverse problem in a wide frequency range, typically from 500 Hz to 5 MHz, both on and off resonance. The method was validated experimentally by ultrasonic through-transmission around 1.9 MHz. Experimentally, the method is arguably simple and low cost, and it is not limited to specific geometries and crystal symmetries. Moreover, by involving off-resonance frequencies, it allows for determining the imaginary parts of the elastic moduli, equivalent to attenuation coefficients. Finally, the method has no obvious frequency limitations before severe attenuation sets in above 100 MHz.

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An acoustic characterization of polymethyl methacrylate and three epoxy formulations

Cited by 41 publications

References 6 publications

Whole-System Ultrasound Resonances as the Basis for Acoustophoresis in All-Polymer Microfluidic Devices

Whole-System Ultrasound Resonances as the Basis for Acoustophoresis in All-Polymer Microfluidic Devices

Ultrasonic properties of polystyrene‐based composites

Determination of the complex-valued elastic moduli of polymers by electrical impedance spectroscopy for ultrasound applications

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