A feedback mechanism between crystals and bubbles in a RuO2-bearing melt

Pereira, Luiz; Nuernberg, Rafael Bianchini; Podda, Olivier; Machado, Norma Maria Pereira; Laplace, Annabelle; Pigeonneau, Franck; Kueppers, Ulrich; Hess, Kai‐Uwe; Dingwell, Donald B.

doi:10.1016/j.jnoncrysol.2022.121456

Cited by 5 publications

(7 citation statements)

References 23 publications

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“…Experimental studies and observations of natural products suggest that Fe-Ti-bearing nanolite formation can moreover favor gas-melt coupling by (i) fostering bubble nucleation [47][48][49]65,110,111 and (ii) inhibiting gas bubble motion, coalescence and eventually outgassing due to the formation of aggregates and to an increase in viscosity 21,32,103 . The likelihood of these processes is also supported by studies performed on microlites: it is well known [165][166][167][168] that Fe-Ti-oxides are unrivaled in their ability to facilitate bubble nucleation 65 .…”

Section: Resultsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

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An increasing number of studies are being presented demonstrating that volcanic glasses can be heterogeneous at the nanoscale. These nano-heterogeneities can develop both during viscosity measurements in the laboratory and during magma eruptions. Our multifaceted study identifies here total transition metal oxide content as a crucial compositional factor governing the tendency of basalt melts and glasses towards nanolitization: at both anhydrous and hydrous conditions, an undercooled trachybasalt melt from Mt. Etna readily develops nanocrystals whose formation also hampers viscosity measurements, while a similar but FeO- and TiO2-poorer basalt melt from Stromboli proves far more stable at similar conditions. We therefore outline a procedure to reliably derive pure liquid viscosity without the effect of nanocrystals, additionally discussing how subtle compositional differences may contribute to the different eruptive styles of Mt. Etna and Stromboli.

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Section: Resultsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

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“…Apart from these evidences, it is also important to mentioned that in Pereira et al 1 , we measured the contact angle between air bubbles and RuO 2 crystals immersed in a borosilicate melt. This contact angle is one of the largest found in literature along with magnetite 3 , 51 .…”

Section: Discussionmentioning

confidence: 94%

“…The presence of crystalline solids suspended in melts affects many properties of silicate systems, such as electrical conductivity, dynamics of bubbles, onset of viscoelasticity, and apparent suspension viscosity 1 – 9 . Partially crystallised silicates with moderate-to-high crystal volume fractions ( ) can exhibit apparent viscosities many orders of magnitude higher than that of the pure liquid phase 10 – 14 .…”

Section: Introductionmentioning

confidence: 99%

Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles

Pereira

Vasseur

Wadsworth

et al. 2022

Sci Rep

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We study the rheology of silicate melts containing platinum-group element (PGE) particles. They exhibit a shear-thinning behaviour, an intense aggregation tendency, and an anomalously high apparent viscosity in the low shear rate limit, even at very low particle volume fraction. Using a compilation of published experimental data, we analyse these effects in three steps. Firstly, we observe that the viscosities of these suspensions are much higher than those of natural silicate crystal-bearing melts for low shear rate regimes. Secondly, we demonstrate that the viscosities at low shear rate limit cannot be estimated by classical rheological models but rather may be understood as the result of particle aggregation, trapping dead fluid, and thereby increasing the effective particle volume fraction. Finally, we scale the critical shear rates for shear-thinning using a Peclet number analysis—invoking a competition between random thermal particle motion and hydrodynamic shearing motion—and, using an empirical extension, we additionally account for the particle–particle interaction energetics. We propose a framework in which the rheology of this family of particle-bearing melts can be predicted, and demonstrate that at low Peclet numbers, PGE-bearing particle aggregation is driven by interparticle forces and Brownian motion.

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“…By comparing a simplified laboratory-scale system in which borosilicate melt contains ruthenium(IV) oxide crystals (approx. 2.0 vol.%) with the equivalent system without crystals, it has been noticed that RuO 2 crystals change the dynamics of bubbles [ 25 , 26 ]. Different from other oxides coming from the nuclear waste, RuO 2 when added to the borosilicate glass matrix during the immobilization procedure, is present as suspended crystals due to its sparing solubility in this type of melt [ 27 ].…”

Section: Similar Processes In Industrial and Natural Systemsmentioning

confidence: 99%

The physics of dancing peanuts in beer

et al. 2023

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In Argentina, some people add peanuts to their beer. Once immersed, the peanuts initially sink part way down into the beer before bubbles nucleate and grow on the peanut surfaces and remain attached. The peanuts move up and down within the beer glass in many repeating cycles. In this work, we propose a physical description of this dancing peanuts spectacle. We break down the problem into component physical phenomena, providing empirical constraint of each: (i) heterogeneous bubble nucleation occurs on peanut surfaces and this is energetically preferential to nucleation on the beer glass surfaces; (ii) peanuts enshrouded in attached bubbles are positively buoyant in beer above a critical attached gas volume; (iii) at the beer top surface, bubbles detach and pop, facilitated by peanut rotations and rearrangements; (iv) peanuts containing fewer bubbles are then negatively buoyant in beer and sink; and (v) the process repeats so long as the beer remains sufficiently supersaturated in the gas phase for continued nucleation. We used laboratory experiments and calculations to support this description, including constraint of the densities and wetting properties of the beer–gas–peanut system. We draw analogies between this peanut dance cyclicity and industrial and natural processes of wide interest, ultimately concluding that this bar-side phenomenon can be a vehicle for understanding more complex, applied systems of general interest and utility.

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A feedback mechanism between crystals and bubbles in a RuO2-bearing melt

Cited by 5 publications

References 23 publications

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles

The physics of dancing peanuts in beer

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