Nucleation and growth of Ni0 nanoparticles and thin films by TEM electron irradiation

Ángel, P. Del; Rodrıguez-Hernandez, J.; Garcı́a-Bórquez, A.; Montoya, J.A.

doi:10.1016/j.cattod.2012.12.018

Cited by 9 publications

(9 citation statements)

References 20 publications

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“…In addition, we note that all treatments were done in room temperature. That is, no thermal treatments are required as in a recent study of EI-induced nanocrystallization of Ni [26].…”

Section: Resultsmentioning

confidence: 99%

Electron-Irradiation Induced Nanocrystallization of Pb(II) in Silica Gels Prepared in High Magnetic Field

Kaito¹,

Mori²,

Kaito³

2015

JCCE

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In a previous study, structure of silica gels prepared in a high magnetic field was investigated. While a direct application of such anisotropic silica gels is for an optical anisotropic medium possessing chemical resistance, we show here their possibility of medium in materials processing. In this direction, for example, silica hydrogels have so far been used as media of crystal growth. In this paper, as opposed to the soft-wet state, dried silica gels have been investigated. We have found that lead (II) nanocrystallites were formed induced by electron irradiation to lead (II)-doped dried silica gels prepared in a high magnetic field such as B = 10 T. Hydrogels made from a sodium metasilicate solution doped with lead (II) acetate were prepared. The dried specimens were irradiated by electrons in a transmission electron microscope environment. Electron diffraction patterns indicated the crystallinity of lead (II) nanocrystallites depending on B. An advantage of this processing technique is that the crystallinity can be controlled through the strength of magnetic field B applied during gel preparation. Specific skills are not required to control the strength of magnetic field.

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“…In addition, we note that all treatments were done in room temperature. That is, no thermal treatments are required as in a recent study of EI-induced nanocrystallization of Ni [26].…”

Section: Resultsmentioning

confidence: 99%

Electron-Irradiation Induced Nanocrystallization of Pb(II) in Silica Gels Prepared in High Magnetic Field

Kaito¹,

Mori²,

Kaito³

2015

JCCE

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“…Nucleation and growth of nickel (Ni) NPs on carbon support induced by the electron beam irradiation experiments on nickel oxide (NiO), were studied by Angel et al at the nanoscale in the TEM. The study indicated that the Ni NPs followed a monomer attachment and coalescence driven growth pathway on the support …”

Section: Metalsmentioning

confidence: 99%

“…The study indicated that the Ni NPs followed a monomer attachment and coalescence driven growth pathway on the support. 343 More recently, Ercius, Hyeon, and co-workers investigated the crystallization dynamics of Ni NPs from a molecular precursor solution containing Ni−ammine−acetate complexes using LCTEM at the atomic scale. 344 As shown in Figure 38, the Ni NPs in the solution show an amorphous-phase-mediated mechanism.…”

Section: Npsmentioning

confidence: 99%

In Situ Kinetic Observations on Crystal Nucleation and Growth

Deepak

2022

Chem. Rev.

149

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Nucleation and growth are critical steps in crystallization, which plays an important role in determining crystal structure, size, morphology, and purity. Therefore, understanding the mechanisms of nucleation and growth is crucial to realize the controllable fabrication of crystalline products with desired and reproducible properties. Based on classical models, the initial crystal nucleus is formed by the spontaneous aggregation of ions, atoms, or molecules, and crystal growth is dependent on the monomer’s diffusion and the surface reaction. Recently, numerous in situ investigations on crystallization dynamics have uncovered the existence of nonclassical mechanisms. This review provides a summary and highlights the in situ studies of crystal nucleation and growth, with a particular emphasis on the state-of-the-art research progress since the year 2016, and includes technological advances, atomic-scale observations, substrate- and temperature-dependent nucleation and growth, and the progress achieved in the various materials: metals, alloys, metallic compounds, colloids, and proteins. Finally, the forthcoming opportunities and challenges in this fascinating field are discussed.

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“…As mechanical milling is a solid state process, it needs to overcome the difficulty of the formation of new powders using a starting mixture of low and high melting temperature elements. Thus, mechanical milling is a processing technique for solid materials to obtain smaller-sized particles, through high impact, which is a simple and efficient method to obtain nanomaterials of inorganic origin (Pochet et al, 1995; Maurice & Courtney, 1996; Tokumitsu, 1997; Kakuk et al, 2009; Yu & Wu, 2011; Ullah et al, 2014; Cipolloni et al, 2015). Nevertheless, the technique has been rarely used for the preparation of materials with a biological origin as in the present investigation.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, nanotechnology has provided opportunities to increase therapeutic properties of materials of biological origin by developing and engineering advanced materials (Lü & Lai, 1998;Suryanarayana, 2004) with improved properties (Del Angel et al, 2013;Hong et al, 2015), using a variety of methods to develop nanostructured materials (Chen et al, 2003;Zhou et al, 2009). Obtaining nanoparticles has frequently been used to improve functional properties such as increasing the bioactivity of pharmaceutical materials and foods.…”

Section: Introductionmentioning

confidence: 99%

Structural and Physicochemical Characterization of Spirulina (Arthrospira maxima) Nanoparticles by High-Resolution Electron Microscopic Techniques

et al. 2016

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The objective of this work was to obtain Spirulina (Arthrospira maxima) nanoparticles (SNPs) by using high-impact mechanical milling and to characterize them by electron microscopy and spectroscopy techniques. The milling products were analyzed after various processing times (1-4 h), and particle size distribution and number mean size (NMS) were determined by analysis of high-resolution scanning electron microscopic images. The smallest particles are synthesized after 3 h of milling, had an NMS of 55.6±3.6 nm, with 95% of the particles being smaller than 100 nm. High-resolution transmission electron microscopy showed lattice spacing of ~0.27±0.015 nm for SNPs. The corresponding chemical composition was obtained by energy-dispersive X-ray spectroscopy, and showed the presence of Ca, Fe, K, Mg, Na, and Zn. The powder flow properties showed that the powder density was higher when the average nanoparticle size is smaller. They showed free flowability and an increase in their specific surface area (6.89±0.23 m2/g) up to 12-14 times larger than the original material (0.45±0.02 m2/g). Fourier transform infrared spectroscopy suggested that chemical damage related to the milling is not significant.

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Nucleation and growth of Ni0 nanoparticles and thin films by TEM electron irradiation

Cited by 9 publications

References 20 publications

Electron-Irradiation Induced Nanocrystallization of Pb(II) in Silica Gels Prepared in High Magnetic Field

Electron-Irradiation Induced Nanocrystallization of Pb(II) in Silica Gels Prepared in High Magnetic Field

In Situ Kinetic Observations on Crystal Nucleation and Growth

Structural and Physicochemical Characterization of Spirulina (Arthrospira maxima) Nanoparticles by High-Resolution Electron Microscopic Techniques

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