Kinetic studies of nucleation and growth of palladium nanoparticles

Wojnicki, Marek; Fitzner, K.; Luty–Błocho, Magdalena

doi:10.1016/j.jcis.2015.11.066

Cited by 35 publications

(21 citation statements)

References 36 publications

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“…The basic solution of Pd(II) ions was 0.1127 M of [PdCl 4 ] 2¯ . The stock solution was prepared by dissolving of 14.8846 g Pd (pure 99.99; Mennica Państwowa, Poland) in an aqua regia (mixture of concentrated hydrochloric and nitric acid in volume ratio 3:1, POCH; Gliwice, Poland) repeated evaporation to dryness and dilution in deionized water repeated twice (Wojnicki et al 2016 ).…”

Section: Methodsmentioning

confidence: 99%

“…For this purpose, we used kinetic data given in our previous work. Based on that previous study (Wojnicki et al 2016 ), the optimal resistance time t 0 and total flow rate (i.e., 6.0 ml/min) in the microreactor were established (see Supplementary materials) from the obtained sigmoidal curves related to slow nucleation and fast autocatalytic growth. Constant temperature for nanoparticle synthesis in the flow was also selected (40 °C).…”

Section: Methodsmentioning

confidence: 99%

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Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

2018

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The synthesis of palladium nanoparticles and conditions of their deposition on active carbon fibers in the microreactor was described. All processes related with metal ion reduction, nucleation, and autocatalytic growth of particles as well as their deposition were carried out in the microreactor in only one cycle. Synthesis of palladium nanoparticles was carried out under different conditions, i.e., changing the initial concentration of metal ions and the reductant, at 40 °C. Depending on the conditions imposed, the nanoparticles of different size (hydrodynamic radius change from 12 to 37 nm) and shape (spherical, cube, pyramid) were obtained. It was also shown that flow conditions allow for much more efficient Pd deposition on active carbon fibers than the process carried out in the batch. It was observed that for concentrations of Pd(II) ions higher than 0.2 mM, the degree of fiber surface coverage increased significantly in comparison with the batch process.Electronic supplementary materialThe online version of this article (10.1007/s11051-018-4337-9) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

2018

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“…Based on the model of Finke-Watzky [38][39][40][41], we are able to analyze the kinetics and mechanism of the reaction. From obtained kinetic curves, it is possible to determine nucleation and growth rate constants [16,37,42], thus obtaining an insight into the rate of separate steps.…”

Section: Nanoparticles Synthesis and The Proposed Mechanism Of Their mentioning

confidence: 99%

Linking the Gold Nanoparticles Formation Kinetics with Their Morphology

Luty–Błocho

Wojnicki

Grzonka

et al. 2018

Int J of Chemical Kinetics

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In this paper, we show that using different concentrations of reagents, it is possible to produce gold nanoparticles with different morphology (size, shape). The color of obtained colloidal gold change from pink, violet to blue, and it corresponds to the shape change. The pink color corresponds to spherical nanoparticles and the blue one to a star shape. The mixture of those two types of nanoparticles result in a violet tone. It was also shown that kinetics of nucleation and growth process is controlled by the reaction on the gold atoms surface, i.e., comproportionation of Au(III) and Au(0) to Au(I), which can be inhibited by varying precursor and reductant concentration.

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“…III-rd stage, describing autocatalytic growth, is typical for noble metals nanoparticles formation [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ]:

where k 1,obs , k 2,obs , k 3,obs denote the observed rate constants in Equations (5)–(7).…”

Section: Resultsmentioning

confidence: 99%

On the Rate of Interaction of Sodium Borohydride with Platinum (IV) Chloride Complexes in Alkaline Media

2021

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In this work, sodium borohydride was used as a strong reductant of traces of platinum complex ions. The investigations of the kinetics of redox reaction between platinum(IV) chloride complex ions and sodium borohydride were carried out. For the first time, the kinetic experiments were carried out in a basic medium (pH~13), which prevents NaBH4 from decomposition and suppresses the release of hydrogen to the environment. The rate constants of Pt(IV) reduction to Pt(II) ions under different temperatures and concentrations of chloride ions conditions were determined. In alkaline solution (pH~13), the values of enthalpy and entropy of activation are 29.6 kJ/mol and –131 J/mol K. It was also found that oxygen dissolved in the solution strongly affects kinetics of the reduction process. Using collected results, the reduction mechanism was suggested. For the first time, the appearance of diborane as an intermediate product during Pt(IV) ions reduction was suggested. Moreover, the influence of oxygen present in the reacting solution on the rate of reduction reaction was also shown.

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Kinetic studies of nucleation and growth of palladium nanoparticles

Cited by 35 publications

References 36 publications

Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

Linking the Gold Nanoparticles Formation Kinetics with Their Morphology

On the Rate of Interaction of Sodium Borohydride with Platinum (IV) Chloride Complexes in Alkaline Media

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