Ultrasonic backscattering method for in-situ characterisation of concentrated dispersions

Weser, Robert; Woeckel, S.; Wessely, Benno; Steinmann, Ulrike; Babick, Frank

doi:10.1016/j.powtec.2014.08.026

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…Another technique called electroacoustics allows zeta potential measurement in concentrated suspensions (29)(30)(31). In order to speed up the formulation optimisation and characterisation processes, in-situ and online analytical techniques have been reported recently (32)(33)(34).…”

Section: Milling (Bead Milling)mentioning

confidence: 99%

Optimisation and analysis of bead milling process for preparation of highly viscous, binder-free dispersions of carbon black pigment

Ali

Lin

2018

Progress in Organic Coatings

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Section: Milling (Bead Milling)mentioning

confidence: 99%

Optimisation and analysis of bead milling process for preparation of highly viscous, binder-free dispersions of carbon black pigment

Ali

Lin

2018

Progress in Organic Coatings

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“…In situ backscatter devices, which measure the echo response, also offer better application flexibility than instrumentation which incorporate separate transmitters and receivers, including electrical tomographic methods [4,5], gamma or x-ray densitometers [6,7], as well as ultrasonic transmission methods [8][9][10][11]. Both single-frequency and array-based echo techniques are now widely utilised to measure particle properties in relatively low-concentration environmental sediment transport studies [12][13][14][15], and similar methods are being investigated for a number of industrial fields [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Measurement and density normalisation of acoustic attenuation and backscattering constants of arbitrary suspensions within the Rayleigh scattering regime

et al. 2019

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The scattering and attenuation of megahertz frequency acoustic backscatter in liquid suspensions, is examined for a range of fine organic and inorganic particles in the Rayleigh regime, 10 -4 < ka < 10 0 (where k is the wavenumber and a the particle radius) which are widely industrially relevant, but with limited existing data. In particular, colloidal latex, mineral titania and barytes sediments, as well as larger glass powders were investigated. A manipulation of the backscatter voltage equation was used to directly measure the sediment attenuation constants, . Decoupling of the combined backscattering-transducer constant, allowing explicit measurement of the backscattering constant, ks, was achieved through calibration of the transducer constant, kt. Additionally, the methodology was streamlined via averaging between a number of intermediate concentrations to reduce data variability. This approach enabled the form function, f, and the corresponding total normalized scattering cross-sections, , to be determined for all species. While f and are available in the literature for large glass and sand, this methodology allowed extension for the colloidal organic and inorganic particles. Specific gravity normalisation of f collapsed all data onto a single distribution, with the exception of titania, due to scattering complexities associated withagglomeration. There was some additional variation in , with measured values of the fine particles up to of magnitude greater than the density-normalised prediction at low ka . Mechanisms accounting for these variations from theory are however analysed, and include viscous attenuation effects, the polydispersity of the particle type and increasing influence of the solvent attenuation.Additionally, thermoacoustic losses appeared to dominate the attenuation behaviour of the organic latex particles. This study demonstrates that particles close to the colloidal regime can be measured successfully with acoustic backscatter, and highlights the great potential of this technique to be applied for in situ or online monitoring purposes in such systems.

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“…Anhand dieses Empfangssignals soll die disperse Phase abhängig von der Schallfrequenz sowie der Konzentration und Größe der Füllstoffpartikel analysiert werden. [20,21]. Bei logarithmischer Skalierung der Standardabweichung kann der in Bild 6 gezeigte Verlauf abschnittsweise durch eine lineare Funktion approximiert werden:…”

Section: Ultraschall-methodenunclassified

P3.1 - Inline-Analyse der Dispergiergüte von Kunststoff- Compounds

Wöckel¹,

Arndt²,

Steinmann³

2015

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Ultrasonic backscattering method for in-situ characterisation of concentrated dispersions

Cited by 20 publications

References 18 publications

Optimisation and analysis of bead milling process for preparation of highly viscous, binder-free dispersions of carbon black pigment

Optimisation and analysis of bead milling process for preparation of highly viscous, binder-free dispersions of carbon black pigment

Measurement and density normalisation of acoustic attenuation and backscattering constants of arbitrary suspensions within the Rayleigh scattering regime

P3.1 - Inline-Analyse der Dispergiergüte von Kunststoff- Compounds

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