On the nanobubbles interfacial properties and future applications in flotation

Calgaroto, Selma; Wilberg, K.Q.; Rubio, J.

doi:10.1016/j.mineng.2014.02.002

Cited by 224 publications

(141 citation statements)

References 52 publications

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“…10, 14, 15 Consistent with previous reports, 7, 14 our zeta potential results confirmed that nanobubbles are negatively charged. Following reconstitution with rhIL-1ra the magnitude and sign of the zeta potentials in this system were dependent on the net charge on rhIL-1ra molecules, as controlled by altering buffer pH.…”

Section: Discussionsupporting

confidence: 92%

Particle Formation and Aggregation of a Therapeutic Protein in Nanobubble Suspensions

Snell

Zhou

Carpenter

et al. 2016

Journal of Pharmaceutical Sciences

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The generation of nanobubbles following reconstitution of lyophilized trehalose formulations has recently been reported.1 Here, we characterize particle formation and aggregation of recombinant human interleukin-1 receptor antagonist (rhIL-1ra) in reconstituted formulations of lyophilized trehalose. Particle characterization methods including resonant mass measurement and nanoparticle tracking analysis were used to count and size particles generated upon reconstitution of lyophilized trehalose formulations. In addition, accelerated degradation studies were conducted to monitor rhIL-1ra aggregation in solutions containing various concentrations of suspended nanobubbles. Reconstitution of lyophilized trehalose formulations with solutions containing rhIL-1ra reduced nanobubble concentrations and generated negatively buoyant particles attributed to aggregated rhIL-1ra. Furthermore, levels of rhIL-1ra aggregation following incubation in aqueous solution correlated with concentrations of suspended nanobubbles. The results of this study suggest nanobubbles may be a contributor to protein aggregation and particle formation in reconstituted, lyophilized therapeutic protein formulations.

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Section: Discussionsupporting

confidence: 92%

Particle Formation and Aggregation of a Therapeutic Protein in Nanobubble Suspensions

Snell

Zhou

Carpenter

et al. 2016

Journal of Pharmaceutical Sciences

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“…Previous research studies have proven that NBs Decreasing bubble size and increasing apparent particle size are the two basic approaches to improving fine and ultrafine mineral flotation [3]. Previous research studies have proven that NBs generated in the process of HC play roles in both of these two approaches, which are also convinced to be the main contributors for HC-enhanced flotation [26,27]. However, how do NBs affect the bubble average size and particle apparent size in the case of HCPS and HCPP?…”

Section: Shear Yield Stress Measurementsmentioning

confidence: 99%

“…Minerals 2018, 8, x FOR PEER REVIEW 6 of 10 generated in the process of HC play roles in both of these two approaches, which are also convinced to be the main contributors for HC-enhanced flotation [26,27]. However, how do NBs affect the bubble average size and particle apparent size in the case of HCPS and HCPP?…”

Section: Nbs Properties and Their Influence On Flotation Bubble Size mentioning

confidence: 99%

“…It is clear that NBs with an average size around 200-300 nm have been produced in the HC process. Using the same technique, Calgaroto [26] discovered that NBs with a size distribution ranging from 100 nm to 800 nm are produced by depressurizing air-saturated water solutions at a high flow velocity. Furthermore, with the increase of NaOl concentration, the average bubble size decreases and the average count rate increases.…”

Section: Nbs Properties and Their Influence On Flotation Bubble Size mentioning

confidence: 99%

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Different Flotation Performance of Ultrafine Scheelite under Two Hydrodynamic Cavitation Modes

Zhou

Shi

et al. 2018

Minerals

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Abstract:In industrial practice, hydrodynamic cavitation (HC) is commonly triggered by jetting either reagent solution or pulp. Although both methods can enhance mineral flotation, are their roles the same? There are few research studies in the field, which severely limits our understanding on mineral flotation combined with HC. Therefore, in this study, the flotation of ultrafine scheelite with HC pretreatments of reagent solution and pulp (abbreviated to be HCPS and HCPP, respectively) was studied and compared through flotation tests, zeta potential analysis, microscope tests, and shear yield stress measurements. The results of flotation tests show that both HCPS and HCPP can enhance the final flotation performance, but in general, HCPP leads to greater improvements on the final flotation recovery. The presence of (hydrophobized) scheelite particles brings extra gas nuclei for the cavitation-flotation system, suggesting that more NBs may be produced in the case of HCPP compared with HCPS. These tiny bubbles remarkably reduce the size distribution of bubbles in the flotation system, thus increasing the particle-bubbles collision probability. Increase in particle aggregation may be another reason why flotation with HCPP results in a higher flotation recovery. The adherence of NBs on hydrophobized particles decreases the (absolute) surface charge of the solids, resulting in a smaller repulsive force among particles and more significant particle aggregation, which is confirmed by the microscope tests and shear yield stress measurements.

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“…Bolhas de oxigênio possuem um ponto de carga zero (PCZ) em pH entre 2 e 4 (Brandon e Kelsall, 1985;Li e Somasundaran, 1991;Yang et al, 2001;Elmahdy et al, 2008;Calgaroto et al, 2014). Analisando a carga superficial da bolha de oxigênio na faixa de pH de 2 até 11 tem-se as seguintes afirmações: em pH ácido abaixo do pH do ponto do PCZ a carga superficial da bolha será positiva e acima do pH do PCZ a carga superficial será negativa.…”

Section: Bolhas De Oxigêniounclassified

Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

HACHA¹

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Eletroflotação de partículas finas de hematita em célula modificada de Partridge Smith usandoRhodococcus opacus como biorreagente This work aims to evaluate the electroflotation of hematite fine particles in a modified Partridge Smith cell using Rhodococcus opacus. A hematite sample with grade 96% was used in this study; additionally, three granulometric fractions were selected: -53+38; -38+20 and -20 micrometers. The variables studied were pH, reagent concentration and current density. Zeta potential measurements and analysis by infrared spectroscopy were carried out to assess the interaction before and after reagents interaction. In order to gain a better understanding of the bubble diameter influence in the process, measurements of the diameter of hydrogen and oxygen bubbles were done. The average bubble diameter (d 32 ) was found in the range of 40 to 60 micrometers for the hydrogen bubbles and of 50 to 70 micrometers for the oxygen bubbles. Finally, electrocoagulation assays the hematite with R. opacus and sodium oleate were carried out. The reduction in particle size favored the floatability of hematite; this fact can be related to the bubble size generated in the process and the ability of R. opacus to form floccules through the interaction of Van der Waals. On the other hand, the increase of reagent concentration (R. opacus and sodium oleate) favored the floatability of hematite. Suitable pH values for hematite flotation were found around 6 and 7 for R. opacus and sodium oleate, respectively. Maximum hematite floatability with R. opacus using hydrogen bubbles was around 80% and around 65% with oxygen bubbles. Sodium oleate presented a better performance reaching a maximum floatability of approximately 98% for hydrogen bubbles and around 90% for oxygen bubbles. The characteristics of the bacterial surface and the bubble size were determinant factors in the hematite floatability. Therefore, the electroflotation process using R. opacus as collector is a potential technology regarding environmental issues found with the synthetic reagents.

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On the nanobubbles interfacial properties and future applications in flotation

Cited by 224 publications

References 52 publications

Particle Formation and Aggregation of a Therapeutic Protein in Nanobubble Suspensions

Particle Formation and Aggregation of a Therapeutic Protein in Nanobubble Suspensions

Different Flotation Performance of Ultrafine Scheelite under Two Hydrodynamic Cavitation Modes

Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

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