Sonoluminescence of Uranyl Ions in Aqueous Solutions

Pflieger, Rachel; Cousin, Virginie; Barré, Nicole; Moisy, Philippe; Nikitenko, Sergey I.

doi:10.1002/chem.201102150

Cited by 18 publications

(18 citation statements)

References 23 publications

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“…The photons and the "hot" particles produced inside the bubble enable exciting the nonvolatile species in solutions, thus increasing their chemical reactivity. For example, power ultrasound enables the excitation of lanthanide ions [51,52] and uranyl UO 2 2+ ions [53] in aqueous acidic solutions. The mechanism of excitation involves two stages: sonophotoluminescence (excitation with photons emitted by collapsing bubble) dominates in diluted solutions, and collisional excitation with "hot" particles would add its contribution at higher metal ions concentration.…”

Section: Activating Molecules Ions and Solids With Acoustic Cavitationmentioning

confidence: 99%

Plasma Formation during Acoustic Cavitation: Toward a New Paradigm for Sonochemistry

Nikitenko

2014

Advances in Physical Chemistry

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The most recent spectroscopic studies of single bubble (SBSL) and multibubble (MBSL) sonoluminescence reveal that the origin of extreme intrabubble conditions is related to nonequilibrium plasma formed inside the collapsing bubbles. Analysis of the relative populations of OH(A 2 Σ + ) vibrational states observed during MBSL in water saturated with noble gases shows that in the presence of argon at low ultrasonic frequency weakly excited plasma is formed. At high-frequency ultrasound the plasma inside the collapsing bubbles exhibits Treanor behavior typical for strong vibrational excitation. Plasma formation during SBSL was observed in concentrated H 2 SO 4 preequilibrated with Ar. The light emission spectra exhibit the lines from excited Ar atoms and ionized oxygen O 2 + . Formation of O 2 + species is inconsistent with any thermal process. Furthermore, the SBSL spectra in H 2 SO 4 show emission lines from Xe + , Kr + , and Ar + in full agreement with plasma hypothesis. The photons and the "hot" particles generated by cavitation bubbles enable the excitation of nonvolatile species in solutions increasing their chemical reactivity. Secondary sonochemical products may arise from chemically active species that are formed inside the bubble but then diffuse into the liquid phase and react with solution precursors to form a variety of products.

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Section: Activating Molecules Ions and Solids With Acoustic Cavitationmentioning

confidence: 99%

Plasma Formation during Acoustic Cavitation: Toward a New Paradigm for Sonochemistry

Nikitenko

2014

Advances in Physical Chemistry

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“…High-power ultrasound offers the opportunity to generate in situ redox species with controlled kinetics and therefore suggests the possible application of ultrasound in actinide chemistry. 27 The aim of the present work is to evaluate the influence of ultrasound on the redox behavior of Pu(IV) and Pu(III) in aqueous nitric solutions. Mainly, the studies dealt with the dissolution of oxides [20][21][22] and the valency control of actinide ions in aqueous solutions.…”

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Sonochemical redox reactions of Pu(iii) and Pu(iv) in aqueous nitric solutions

et al. 2015

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The behavior of Pu(iv) and Pu(iii) was investigated in aqueous nitric solutions under ultrasound irradiation (Ar, 20 kHz). In the absence of anti-nitrous reagents, ultrasound has no effect on Pu(iv), while Pu(iii) can be rapidly oxidized to Pu(iv) due to the autocatalytic formation of HNO(2) induced by HNO(3) sonolysis. In the presence of anti-nitrous reagents (sulfamic acid or hydrazinium nitrate), Pu(iv) can be sonochemically reduced to Pu(iii). The reduction follows a first order reaction law and leads to a steady state where Pu(iv) and Pu(iii) coexist in solution. The reduction process is attributed to the sonochemical generation of H(2)O(2) in solution. The kinetics attributed to the reduction of Pu(iv) are however higher than those related to the formation of H(2)O(2) which, after several hypotheses, is explained by the sonochemical erosion of the titanium-based sonotrode. Titanium particles thereby generated can be solubilized under ultrasound and generate Ti(iii) as an intermediate species, a strong reducing agent able to react with Pu(iv).

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“…Moreover, these emission lines can be observed only at 203 kHz which also exhibits the most intense sonoluminescence from sonicated water in the studied range of frequencies. Reproduced with permission from 6 . Besides, the mass spectrometer measures a decrease by 40% in H 2 formation rate during the sonolysis of HClO 4 solutions when UO 2 2+ concentration is increased from 50 to 100 mM.…”

Section: Representative Resultsmentioning

confidence: 99%

“…These catalytic reactions allow control of actinide oxidation states in nitric acid medium without addition of any side chemicals. On the other hand, the products of solvent sonolysis lead to quenching of the sonoluminescence of uranyl 6 and lanthanide 27 ions. Complexation with strong ligands, like phosphate or citrate ions, enhances manifold sonoluminescence of these cations due to reduction of intra-and inner-molecular quenching.…”

Section: Discussionmentioning

confidence: 99%

“…The photons and the "hot" particles produced inside the bubble enable to excite the non-volatile species in solutions thus increasing their chemical reactivity. For example, the mechanism of ultrabright sonoluminescence of uranyl ions in acidic solutions is influenced by uranium concentration: photons absorption/re-emission in diluted solutions, and excitation via collisions with "hot" particles contributes at higher uranyl concentration 6 . Chemical species produced by cavitation bubbles can be used for the synthesis of metallic nanoparticles without any templates or capping agents.…”

Section: Introductionmentioning

confidence: 99%

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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

Pflieger

Chave

Virot

et al. 2014

JoVE

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The chemical and physical effects of ultrasound arise not from a direct interaction of molecules with sound waves, but rather from the acoustic cavitation: the nucleation, growth, and implosive collapse of microbubbles in liquids submitted to power ultrasound. The violent implosion of bubbles leads to the formation of chemically reactive species and to the emission of light, named sonoluminescence. In this manuscript, we describe the techniques allowing study of extreme intrabubble conditions and chemical reactivity of acoustic cavitation in solutions. The analysis of sonoluminescence spectra of water sparged with noble gases provides evidence for nonequilibrium plasma formation. The photons and the "hot" particles generated by cavitation bubbles enable to excite the non-volatile species in solutions increasing their chemical reactivity. For example the mechanism of ultrabright sonoluminescence of uranyl ions in acidic solutions varies with uranium concentration: sonophotoluminescence dominates in diluted solutions, and collisional excitation contributes at higher uranium concentration. Secondary sonochemical products may arise from chemically active species that are formed inside the bubble, but then diffuse into the liquid phase and react with solution precursors to form a variety of products. For instance, the sonochemical reduction of Pt(IV) in pure water provides an innovative synthetic route for monodispersed nanoparticles of metallic platinum without any templates or capping agents. Many studies reveal the advantages of ultrasound to activate the divided solids. In general, the mechanical effects of ultrasound strongly contribute in heterogeneous systems in addition to chemical effects. In particular, the sonolysis of PuO 2 powder in pure water yields stable colloids of plutonium due to both effects. Video LinkThe video component of this article can be found at

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Sonoluminescence of Uranyl Ions in Aqueous Solutions

Cited by 18 publications

References 23 publications

Plasma Formation during Acoustic Cavitation: Toward a New Paradigm for Sonochemistry

Plasma Formation during Acoustic Cavitation: Toward a New Paradigm for Sonochemistry

Sonochemical redox reactions of Pu(iii) and Pu(iv) in aqueous nitric solutions

Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

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