Quartz crystal microbalance as a device to measure the yield stress of colloidal suspensions

Botha, Johannes A.; Ding, Weixuan; Hunter, Timothy N.; Biggs, Simon; Mackay, Graham A.; Cowley, Robin; Woodbury, Simon E.; Harbottle, David

doi:10.1016/j.colsurfa.2018.03.005

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…4). Both F/n and /n increase as the suspension yield stress increases (low pH), consistent with our previous study, 1 although the measured QCM responses begin to decrease before the maximum yield stress (Fig. 4) is reached (pH 5.9).…”

Section: Resultssupporting

confidence: 91%

“…The colloidal probe approach and retract speed was kept constant at 150 nm/s and multiple force curves (> 10) were collected at several different locations on the gold-coated sensor to achieve a reasonable statistical average from each location on the sample.Yield stress: The pH-dependent yield stress of 16.2 vol% TiO2 suspensions were measured using a viscometer (Brookfield DV-II+ Pro Viscometer, UK) with a 4-blade vane of dimensions: H = 43.33 mm and D = 21.67 mm. A detailed explanation of the measurementsetup has been provided in our earlier publication 1. Briefly, the vane was lowered below the suspension interface to a constant height identified by a 'notch' on the geometry.…”

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confidence: 99%

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Resonance properties of quartz crystal microbalance immersed in high solid content suspensions

Botha

Hunter

Johannsmann

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The resonance properties, frequency and half-band-half-width, of a quartz crystal microbalance (QCM) immersed in concentrated suspensions of 16.2 vol% TiO2 are shown to be a function of pH. The overall QCM response is dependent on the complex interactions between the QCM sensor and overlying particle suspension. Atomic force microscopy confirms pH dependent interaction forces between the QCM sensor (gold-coated) and a TiO2 particle: a strong attraction is measured between pH 4-4.5, and the interaction becomes increasingly repulsive at all pH > 6.5. Yield stress measurements of the concentrated TiO2 suspensions also confirm the changing particle-particle interaction strength as the pH is adjusted from acidic to basic conditions. For the chosen system, the total potential energy of interaction (VT) between the sensor-suspension (Au-TiO2) is comparatively stronger than the particle-particle (TiO2-TiO2) interaction; hence the QCM responds to changes in VT sensor-suspension, as verified by the calculated interaction energy between two dissimilar surfaces (Hogg-Healy-Fuerstenau (HHF) theory), and not the suspension yield stress. Slight deviation between the measured QCM responses and the theoretical sphere-plate interaction strength is shown over a narrow pH range and likely corresponds to strengthening particle-particle interactions. Although the suspensions exhibit significant yield strengths, the QCM response can be suitably described by the sensorsuspension contact mechanics of inertial loading. Combined with our previous study 1 , the current study confirms that the suspension yield strength can only be measured when VT sensor-suspension is attractive and comparatively weaker than VT particle-particle.

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Section: Resultssupporting

confidence: 91%

mentioning

confidence: 99%

Resonance properties of quartz crystal microbalance immersed in high solid content suspensions

Botha

Hunter

Johannsmann

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Research has been limited to test materials, or it relies on collecting samples from storage containers [18,19,20]. Novel methods for rheological measurements that have been developed are focused on miniaturisation and small sample methods, such as quartz crystal microbalance, but these are still in early research stages [21].…”

Section: Introductionmentioning

confidence: 99%

Compact Viscometer Prototype for Remote In Situ Analysis of Sludge

Fried

Cheneler

Monk

et al. 2019

Sensors

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On the Sellafield site there are several legacy storage tanks and silos containing sludge of uncertain properties. While there are efforts to determine the chemical and radiological properties of the sludge, to clean out and decommission these vessels, the physical properties need to be ascertained as well. Shear behaviour, density and temperature are the key parameters to be understood before decommissioning activities commence. However, limited access, the congested nature of the tanks and presence of radioactive, hazardous substances severely limit sampling and usage of sophisticated characterisation devices within these tanks and therefore, these properties remain uncertain. This paper describes the development of a cheap, compact, and robust device to analyse the rheological properties of sludge, without the need to extract materials from the site in order to be analysed. Analysis of a sludge test material has been performed to create a suitable benchmark material for the rheological measurements with the prototype. Development of the device is being undertaken with commercial off the shelf (COTS) components and modern rapid prototyping techniques. Using these techniques, an initial prototype for measuring shear parameters of sludge has been developed, using a micro-controller for remote control and data gathering. The device is also compact enough to fit through a 75 mm opening, maximising deployment capabilities.

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Investigation on the pseudocapacitive charge storage mechanism of MnO2 in various electrolytes by electrochemical quartz crystal microbalance (EQCM)

Huang

Gao

et al. 2018

Ionics

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Quartz crystal microbalance as a device to measure the yield stress of colloidal suspensions

Cited by 6 publications

References 35 publications

Resonance properties of quartz crystal microbalance immersed in high solid content suspensions

Resonance properties of quartz crystal microbalance immersed in high solid content suspensions

Compact Viscometer Prototype for Remote In Situ Analysis of Sludge

Investigation on the pseudocapacitive charge storage mechanism of MnO2 in various electrolytes by electrochemical quartz crystal microbalance (EQCM)

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