Influence of Particle Size Distribution on Lifetime and Thermal Stability of Ostwald Ripening of Supported Particles

Hu, Sulei; Li, Wei‐Xue

doi:10.1002/cctc.201800331

Cited by 30 publications

(36 citation statements)

References 71 publications

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“…However, deterioration of catalytic performance via thermal agglomeration under typical operating conditions or during regeneration remains a key problem that has received much attention both for reasons of fundamental significance and practical importance [16][17][18][19][20][21]. It is a leading cause of the degradation of industrial catalysts used for large-scale synthesis of commodity chemicals as well as energy and environmental catalytic applications that operate at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability

et al. 2019

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The thermal sintering under oxidative conditions of Rh nanoparticles supported on oxides characterized by very different oxygen storage capacities (OSC) and labilities was studied at 750 and 850 °C. Under sintering conditions, significant particle growth occurred for Rh/γ-Al2O3 (up to 120% at 850 °C). In striking contrast, Rh/ACZ (alumina–ceria–zirconia) and Rh/CZ (ceria–zirconia) exhibited marked resistance to sintering, and even moderate (ca. −10% at 850 °C) to pronounced (ca. −60% at 850 °C) redispersion of the Rh. A model is proposed based on a double-layer description of metal–support interactions assigned to back-spillover of labile oxygen ions onto the Rh particles, accompanied by trapping of atomic Rh by the resulting surface oxygen vacancies. This model accounts for the observed resistance to sintering and actual redispersion of Rh, consistent with both alternative sintering mechanisms, namely Ostwald ripening (OR) or particle migration and coalescence (PMC).

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Section: Introductionmentioning

confidence: 99%

Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability

et al. 2019

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“…Thus, the Biofield Energy Treated sample showed a slight reduction in the T max by 1.67% as compared with the control sample (Table 4). Overall, TGA/DTG revealed that the thermal stability of the Biofield Energy Treated silver sulfadiazine was altered compared with the control sample that might occur due to the reduction in the particle size of the sample [49].…”

Section: Differential Scanning Calorimetry (Dsc) Analysismentioning

confidence: 97%

Consciousness Energy Healing Treatment: Impact on Physicochemical and Thermal Properties of Silver Sulfadiazine

Nayak¹,

Trivedi²,

Branton³

et al. 2018

JAPST

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Silver sulfadiazine is a topical medicine that belongs to sulfa antibiotics class of drugs and used in treating wound infections in burn patients. The aim of this study was to determine the effect of Consciousness Energy Healing Treatment (the Trivedi Effect®) on the various properties of silver sulfadiazine with the help of modern analytical techniques. The sample was divided into two parts; the first part was not given any treatment and considered as a control sample, while the second part was provided the Consciousness Energy Healing Treatment by the Biofield Energy Healer, Gopal Nayak remotely, named as the treated sample. The powder XRD data showed significant alterations in the peak intensities of the treated sample ranging from-30.71% to 47.54% compared to the control sample. The crystallite size was altered ranging from -78.12% to 1.47%; and the average crystallite size was significantly reduced by 31.62% in the treated sample compared to the control sample. The particle sizes were decreased in the treated sample by 12.75%(d10), 4.98%(d50), 0.89%(d90), and 2.92%{D(4,3)}; thus, the specific surface area was significantly increased by 17.31% compared with the control sample. The latent heat of fusion and latent heat of decomposition were profoundly increased by 24.62% and 156.28%, respectively in the treated sample compared to the control sample. The total weight loss was increased by 3.08% and the residue amount was reduced by 4.44% in the treated sample compared to the control sample. Thus, the Trivedi Effect®-Consciousness Energy Healing Treated sample might form a new polymorph of silver sulfadiazine that possesses reduced particle size and improved thermal properties compared to the untreated sample. Therefore, the Biofield Energy treated sample can be used in nutraceutical/pharmaceutical formulation, which would show a better bioavailability and therapeutic response against various infections in comparison to the control sample.

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“…Furthermore, the uniformity of the PAA-Ag NPs synthesized under 17 s of MW irradiation was reflected in a higher stability for longer storage time, due to a reduction of Ostwald ripening and coalescence mechanisms [28]. The evolution of ultra-small particles in water suspension is still a common critical factor [29,30].…”

Section: Synthesis Of Ultra-small Ag Nanoparticlesmentioning

confidence: 99%

Ultra-Small Silver Nanoparticles Immobilized in Mesoporous SBA-15. Microwave-Assisted Synthesis and Catalytic Activity in the 4-Nitrophenol Reduction

et al. 2021

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Despite the continuous developments in the synthesis of noble metal nanoparticles, the uniformity of particle size distribution still represents a critical aspect. A fast and homogeneous nucleation is a key requirement to achieve a monodisperse particle size distribution and in this scenario, the application of alternative energy sources may constitute a winning strategy for the development of highly active nanocatalysts with unique properties. Here we present several approaches to control the synthesis of Ag nanoparticles stabilized by an anionic template, and the results evidence the advantages of adopting unconventional heating techniques such as microwave heating. The fast and selective electromagnetic heating strongly reduced the nucleation and growth times, impacting on the homogeneity of the resulting particle size distribution. In this work, we have carried out the microwave-assisted synthesis of Ag nanoparticles and the resulting nanoparticles were compared to those synthesized under conventional heating using an oil bath, showing that the differences in temperature profile and heating rates between the two synthesis pathways had a clear effect on the size distribution of the resulting nanoparticles as well as on their stability under long term storage. Finally, the synthesized ultra-small Ag nanoparticles were deposited on a mesoporous substrate, reducing undesired Ostwald ripening and facilitating their reusability. This nanocatalyst was adopted for the abatement of 4-nitrophenol, a well-known carcinogenic pollutant with adverse effects on human beings and aquatic life. The catalytic results confirm the high activity of the catalyst thanks to the high dispersion achieved afforded by ultra-small Ag nanoparticles and the accessibility provided by the wide SBA-15 mesoporous channels.

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Influence of Particle Size Distribution on Lifetime and Thermal Stability of Ostwald Ripening of Supported Particles

Cited by 30 publications

References 71 publications

Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability

Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability

Consciousness Energy Healing Treatment: Impact on Physicochemical and Thermal Properties of Silver Sulfadiazine

Ultra-Small Silver Nanoparticles Immobilized in Mesoporous SBA-15. Microwave-Assisted Synthesis and Catalytic Activity in the 4-Nitrophenol Reduction

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