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Measuring the porosity and compressibility of liquid-suspended porous particles using ultrasound

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Abstract

A key parameter describing the behavior of suspensions is the volume fraction ϕ of the solid particles that are dispersed in the liquid. Obtaining accurate values for ϕ becomes difficult for porous particles, because they can absorb some of the liquid. A prime example are the widely used cornstarch suspensions, for which ϕ usually is only estimated from the mass fraction of particles. Here we present a method to measure the effective porosity and compressibility of porous particles with ultrasound. We obtain the speed of sound in dilute cornstarch suspensions at multiple particle concentrations and with different solvent compressibilities. With the measured particle porosity of 0.31 we are able to calculate the volume fraction of the saturated particles reliably.

Graphical abstract: Measuring the porosity and compressibility of liquid-suspended porous particles using ultrasound

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Publication details

The article was received on 23 Jan 2017, accepted on 08 Apr 2017 and first published on 10 Apr 2017


Article type: Paper
DOI: 10.1039/C7SM00182G
Citation: Soft Matter, 2017, Advance Article
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    Measuring the porosity and compressibility of liquid-suspended porous particles using ultrasound

    E. Han, N. Van Ha and H. M. Jaeger, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00182G

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