Characteristics of the Laser-Induced Breakdown Detection of Colloidal Nanoparticles for Determining Particle Size

Jung, Euo Chang; Cho, H.R.

doi:10.5772/34339

Cited by 2 publications

(3 citation statements)

References 38 publications

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“…20 The experimental setup for LIBD using a CCD camera was described in detail elsewhere. 21 The threshold energy to generate a breakdown (BD) event is lower for colloidal nanoparticles than for the background materials such as ultrapure water or 0.1 M NaClO 4 solutions. In the LIBD experiments, BD probability is defined as the ratio of the numbers of BD events to the numbers of incident laser pulses.…”

Section: Laser-induced Breakdown Detectionmentioning

confidence: 99%

Hydrolysis of trivalent plutonium and solubility of Pu(OH)₃(am) under electrolytic reducing conditions

et al. 2016

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The aim of this work is to determine the solubility product of plutonium hydroxide under reducing conditions and to ascertain the stability of Pu(OH) (am) in water. Hydrolysis of Pu(iii) and solubility of Pu(OH) (am) were investigated at a constant ionic strength of 0.1 M NaClO. Coulometric titration was adopted to adjust the pH of plutonium solutions, during which the electrolytic reducing conditions maintained the oxidation state of Pu(iii). Chemical speciation for dissolved plutonium was investigated using sensitive spectrophotometry coupled with a liquid waveguide capillary cell. The spectroscopic investigations indicated that dissolved Pu(iv), Pu(v), and Pu(vi) species were ignorable under these experimental conditions. The absorbance of Pu ions decreased due to hydrolysis of Pu(iii) but the absorbance of Pu(iii) hydrolysis species was not distinguishable. The formation constant for the first hydrolysis species (log β') determined in the present study is -6.62 ± 0.25. The non-crystalline structure of the plutonium precipitate was observed through X-ray diffraction. The solubility product of Pu(OH) (am), log K' is determined to be 15.23 ± 0.50. These results indicate a stronger tendency for the hydrolysis of Pu(iii) and higher stability (lower solubility) of Pu(OH) (am) compared to Am(iii).

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Section: Laser-induced Breakdown Detectionmentioning

confidence: 99%

Hydrolysis of trivalent plutonium and solubility of Pu(OH)₃(am) under electrolytic reducing conditions

et al. 2016

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“…The trace amounts of colloidal particles generated by Pu hydrolysis were monitored using an LIBD system; the details have been described elsewhere . A temperature-controlled cuvette holder (Peltier-type, Model No.…”

Section: Methodsmentioning

confidence: 99%

“…The trace amounts of colloidal particles generated by Pu hydrolysis were monitored using an LIBD system; the details have been described elsewhere. 29 pH Measurements. pH measurements using a pH electrode are affected by ionic strength, temperature, and background electrolyte property of sample solutions.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Thermodynamic Studies on the Hydrolysis of Trivalent Plutonium and Solubility of Pu(OH)₃(am)

Cho

Kim

et al. 2022

Inorg. Chem.

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The temperature-dependent reaction properties of actinide elements are of particular interest in the safety assessment of high-level radioactive waste (HLRW) disposal systems. In this study, the hydrolysis of Pu(III) and the solubility of Pu(OH)3(am) were investigated at various temperatures (10–40 °C) in 0.1 M NaClO4. A strong reducing condition for maintaining the oxidation state of Pu(III) while slowly increasing the pH of the solution was realized by electrolysis. The formation constants of the first hydrolysis species, log * β1 ′, and the solubility products of Pu(OH)3(am), log * K s,0 ′, at 10, 17, and 40 °C were experimentally determined using spectrophotometry, laser-induced breakdown detection, and radiometry. The enthalpy and entropy changes for these reactions were estimated using the van’t Hoff equation. The first hydrolysis of Pu(III) is endothermic (Δr H m ° = 34.10 ± 4.48 kJ mol–1), and the dissolution of Pu(OH)3(am) is exothermic (Δr H m ° = −294.29 ± 23.05 kJ mol–1) with negative entropy changes. These thermodynamic data will contribute to improving the reliability of the safety assessment of HLRW disposal facilities and understanding the geochemical behavior of Pu under reducing or anoxic aqueous conditions at elevated temperatures.

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Characteristics of the Laser-Induced Breakdown Detection of Colloidal Nanoparticles for Determining Particle Size

Cited by 2 publications

References 38 publications

Hydrolysis of trivalent plutonium and solubility of Pu(OH)₃(am) under electrolytic reducing conditions

Hydrolysis of trivalent plutonium and solubility of Pu(OH)₃(am) under electrolytic reducing conditions

Thermodynamic Studies on the Hydrolysis of Trivalent Plutonium and Solubility of Pu(OH)₃(am)

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Characteristics of the Laser-Induced Breakdown Detection of Colloidal Nanoparticles for Determining Particle Size

Cited by 2 publications

References 38 publications

Hydrolysis of trivalent plutonium and solubility of Pu(OH)3(am) under electrolytic reducing conditions

Hydrolysis of trivalent plutonium and solubility of Pu(OH)3(am) under electrolytic reducing conditions

Thermodynamic Studies on the Hydrolysis of Trivalent Plutonium and Solubility of Pu(OH)3(am)

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Product

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Hydrolysis of trivalent plutonium and solubility of Pu(OH)₃(am) under electrolytic reducing conditions

Hydrolysis of trivalent plutonium and solubility of Pu(OH)₃(am) under electrolytic reducing conditions

Thermodynamic Studies on the Hydrolysis of Trivalent Plutonium and Solubility of Pu(OH)₃(am)