Ostwald Ripening in Metallic Nanoparticles: Stochastic Kinetics

Gentry, Stuart T.; Kendra, Shane F.; Bezpalko, Mark W.

doi:10.1021/jp2009786

Cited by 82 publications

(72 citation statements)

References 26 publications

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“…[35] The latter suggests a dynamic process of atom exchange between nanoclusters, and is usually considered for the discussion of catalyst growth and sintering. Ostwald ripening demonstrates the behavior of catalyst deactivation reported in the current work with four Ni/HBEA samples, in which larger Ni clusters grow further at the expense of the smaller ones which eventually shrink and disappear.…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

Importance of Size and Distribution of Ni Nanoparticles for the Hydrodeoxygenation of Microalgae Oil

Song

Zhao

Lercher

2013

Chemistry A European J

137

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Improved synthetic approaches for preparing small-sized Ni nanoparticles (d=3 nm) supported on HBEA zeolite have been explored and compared with the traditional impregnation method. The formation of surface nickel silicate/aluminate involved in the two precipitation processes are inferred to lead to the stronger interaction between the metal and the support. The lower Brønsted acid concentrations of these two Ni/HBEA catalysts compared with the parent zeolite caused by the partial exchange of Brønsted acid sites by Ni(2+) cations do not influence the hydrodeoxygenation rates, but alter the product selectivity. Higher initial rates and higher stability have been achieved with these optimized catalysts for the hydrodeoxygenation of stearic acid and microalgae oil. Small metal particles facilitate high initial catalytic activity in the fresh sample and size uniformity ensures high catalyst stability.

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Section: Wwwchemeurjorgmentioning

confidence: 99%

Importance of Size and Distribution of Ni Nanoparticles for the Hydrodeoxygenation of Microalgae Oil

Song

Zhao

Lercher

2013

Chemistry A European J

137

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“…Strategically, the formation of Ag nanoplates can be prepared using a kinetically controlled process, in which the atoms would form plate‐like seeds through random hexagonal close packing with the inclusion of stacking faults, followed by their growth into nanoplates . Since the first report on the synthesis of Ag nanoplates using a photo‐induced reaction by Mirkin and coworkers, great efforts have been devoted to the development of methods that are based on photochemical reduction, thermal decomposition, electrochemical reduction, ultrasound‐assisted reduction, seed‐mediated growth, galvanic replacement, and Ostwald ripening . Most of them involved the use of citrate as a capping agent.…”

Section: Introductionmentioning

confidence: 99%

The Role of Etching in the Formation of Ag Nanoplates with Straight, Curved and Wavy Edges and Comparison of Their SERS Properties

Yang

Zhong

Zhang

et al. 2013

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We investigate the role of etching in the formation of Ag nanoplates with different morphologies. By examining the reduction of AgNO3 with poly(vinyl pyrrolidone) in an aqueous solution under a hydrothermal condition, we confirm that etching plays an essential role in promoting the growth of Ag triangular nanoplates with straight edges at the expense of multiple twinned particles via Ostwald ripening. Once all the multiple twinned particles are gone, etching will continue at the corners of nanoplates, leading to the formation of enneahedral nanoplates with curved edges. When the nanoplates with straight edges are transferred into ethanol and subjected to a solvothermal treatment, we obtain nanoplates with wavy edges and sharp corners due to etching on the edges. A comparison study indicates that, at the same particle concentration, Ag nanoplates with wavy edges embraces a SERS enhancement factor at least 6 and 13 times stronger than those with straight and curved edges, respectively. The results from finite difference time domain calculations support our experimental observation that the sharp features on nanoplates with wavy edges are the most active sites for SERS.

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“…However, the diameter of the AuNP almost doubles, which is consistent with an Ostwald ripening process (ESI †). 36 TEM-based electron diffraction and X-ray photoelectron spectroscopy (XPS) confirm that the nature of the NP remains unchanged, even after prolonged heating. Thus, characteristic of Cu(0) 0.20 nm d(111) lattice spacing (Fig.…”

mentioning

confidence: 93%

High thermal stability of block copolymer-capped Au and Cu nanoparticles

et al. 2014

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Producing solution-based metal nanoparticles that do not agglomerate at elevated temperatures remains challenging. We show that thermally stable Au and Cu nanoparticles can be prepared using polystyrene-poly(4-vinylpyridine) diblock copolymers as capping agents. These materials remain stable when their solutions are subjected to prolonged heating up to 160 °C for more than 48 h. These conditions are sufficient for applications in most wet chemical processes and reactions.

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Ostwald Ripening in Metallic Nanoparticles: Stochastic Kinetics

Cited by 82 publications

References 26 publications

Importance of Size and Distribution of Ni Nanoparticles for the Hydrodeoxygenation of Microalgae Oil

Importance of Size and Distribution of Ni Nanoparticles for the Hydrodeoxygenation of Microalgae Oil

The Role of Etching in the Formation of Ag Nanoplates with Straight, Curved and Wavy Edges and Comparison of Their SERS Properties

High thermal stability of block copolymer-capped Au and Cu nanoparticles

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