Can mineral growth by oriented attachment lead to incorporation of uranium(vi) into the structure of goethite?

Numerical simulations of the oriented aggregation of BaTiO3 nanocrystals using the dipole-dipole interaction model have been performed under conditions corresponding to those used in ultrasound-assisted synthesis. The results suggest that BaTiO3 nanocrystals with a diameter of 5 nm have a spontaneous polarization that is not more than one order of magnitude lower than the value of ~0.15 C/m2 for a macroscopic BaTiO3 single crystal.

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One-Pot Assembly of Cu2O Chain-Like Hollow Structures

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.18389 ◽

2008 ◽

Vol 8 (12) ◽

pp. 6332-6337 ◽

Cited By ~ 3

Author(s):

Hua Zhang ◽

Dongfeng Zhang ◽

Lin Guo ◽

Rui Zhang ◽

Penggang Yin ◽

...

Keyword(s):

Hollow Spheres ◽

Solution Process ◽

Oriented Attachment ◽

Interfacial Region ◽

One Pot ◽

Hollow Structures ◽

Peak Intensity ◽

Hollow Nanostructures ◽

Oriented Aggregation ◽

Raman Peak Intensity

Novel Cu2O chain-like network was assembled via a facile one-pot solution process with the assistance of poly(vinylpyrrolidone) (PVP). TEM observations showed that the chain-like structures were aggregated by hollow spheres ∼70 nm in diameter. To be worth mentioning, HRTEM image recorded from the coherent interfacial region demonstrated that the lattice fringes penetrate from one sphere into the adjacent one smoothly without apparent diffraction contrast, which indicated that the hollow spheres experienced lattice fusion and grew into each other. Based on the systematic studies, an oriented aggregation mechanism was proposed, i.e., Cu2O nanoparticles into hollow spheres and subsequently the hollow spheres into the chain-like structures. The Raman spectra of the Cu2O chain-like hollow nanostructures were also investigated. It was found that the Raman peak intensity is different from that in the previous reports, which might be originated from the structure defect resulted from the oriented attachment.

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IV.—On Mineral growth, at ordinary temperatures, and under ordinary conditions

Mineralogical Magazine and Journal of the Mineralogical Society ◽

10.1180/minmag.1877.005.1.05 ◽

1877 ◽

Vol 1 (5) ◽

pp. 158-184

Author(s):

T. A. Readwin

Keyword(s):

Natural Order ◽

Mineral Growth ◽

Close Relationship ◽

At Will

“Plants live, and grow ; Animals live, grow, and move; Minerals, neither live, grow, nor move.”For so long a time, has this been an article of almost universal belief, that any nonconformity therewith, is looked upon with more or less of grave suspicion.In what follows, it is proposed to show that there is a rather more natural order in which the aphorism may appropriately run; namely :—Minerals grow, Plants live and grow, Animals live, grow, and move at will. “The three kingdoms of nature,” as they are not at all inconveniently called, exist in close relationship; so very close, indeed, that some naturalists think they are not really apart from each other.

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Constructing defect-related subband in silver indium sulfide QDs via pH-dependent oriented aggregation for boosting photocatalytic hydrogen evolution

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2021.02.091 ◽

2021 ◽

Vol 593 ◽

pp. 222-230

Author(s):

Xiaoyan Huang ◽

Yu Huang ◽

Fengpo Yan ◽

Xiaogang Xue ◽

Kexiang Zhang ◽

...

Keyword(s):

Hydrogen Evolution ◽

Indium Sulfide ◽

Photocatalytic Hydrogen Evolution ◽

Ph Dependent ◽

Oriented Aggregation

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Controlling the optical properties of nanostructured oxide-based polymer films

Scientific Reports ◽

10.1038/s41598-021-94881-3 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

N. C. Angastiniotis ◽

S. Christopoulos ◽

K. C. Petallidou ◽

A. M. Efstathiou ◽

A. Othonos ◽

...

Keyword(s):

Optical Properties ◽

Metal Oxide ◽

Metal Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Optimal Size ◽

Specific Chemical ◽

Nanostructured Oxide ◽

Bulk Scale ◽

Transmission And Reflection ◽

Film Composites

AbstractA bulk scale process is implemented for the production of nanostructured film composites comprising unary or multi-component metal oxide nanoparticles dispersed in a suitable polymer matrix. The as-received nanoparticles, namely Al$$_2$$ 2 O$$_3$$ 3 , SiO$$_2$$ 2 and TiO$$_2$$ 2 and binary combinations, are treated following specific chemical and mechanical processes in order to be suspended at the optimal size and composition. Subsequently, a polymer extrusion technique is employed for the fabrication of each film, while the molten polymer is mixed with the treated metal oxide nanoparticles. Transmission and reflection measurements are performed in order to map the optical properties of the fabricated, nanostructured films in the UV, VIS and IR. The results substantiate the capability of the overall methodology to regulate the optical properties of the films depending on the type of nanoparticle formation which can be adjusted both in size and composition.

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Construction of EuF3 hollow sub-microspheres and single-crystal hexagonal microdiscs via Ostwald ripening and oriented attachment

CrystEngComm ◽

10.1039/b902838b ◽

2009 ◽

Vol 11 (8) ◽

pp. 1591 ◽

Cited By ~ 19

Author(s):

Zhiming Chen ◽

Zhirong Geng ◽

Menglu Shi ◽

Zhihui Liu ◽

Zhilin Wang

Keyword(s):

Single Crystal ◽

Ostwald Ripening ◽

Oriented Attachment

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Antibacterial and In Vivo Studies of a Green, One-Pot Preparation of Copper/Zinc Oxide Nanoparticle-Coated Bandages

Membranes ◽

10.3390/membranes11070462 ◽

2021 ◽

Vol 11 (7) ◽

pp. 462

Author(s):

Archana R. Deokar ◽

Ilana Perelshtein ◽

Melissa Saibene ◽

Nina Perkas ◽

Paride Mantecca ◽

...

Keyword(s):

Zinc Oxide ◽

Metal Oxide ◽

Ultrasound Irradiation ◽

Face Mask ◽

In Vivo Studies ◽

One Pot ◽

The Face ◽

Bulk Scale ◽

Particle Size And Shape

Simultaneous water and ethanol-based synthesis and coating of copper and zinc oxide (CuO/ZnO) nanoparticles (NPs) on bandages was carried out by ultrasound irradiation. High resolution-transmission electron microscopy demonstrated the effects of the solvent on the particle size and shape of metal oxide NPs. An antibacterial activity study of metal-oxide-coated bandages was carried out against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative). CuO NP-coated bandages made from both water and ethanol demonstrated complete killing of S. aureus and E. coli bacteria within 30 min., whereas ZnO NP-coated bandages demonstrated five-log reductions in viability for both kinds of bacteria after 60 min of interaction. Further, the antibacterial mechanism of CuO/ZnO NP-coated bandages is proposed here based on electron spin resonance studies. Nanotoxicology investigations were conducted via in vivo examinations of the effect of the metal-oxide bandages on frog embryos (teratogenesis assay—Xenopus). The results show that water-based coatings resulted in lesser impacts on embryo development than the ethanol-based ones. These bandages should therefore be considered safer than the ethanol-based ones. The comparison between the toxicity of the metal oxide NPs prepared in water and ethanol is of great importance, because water will replace ethanol for bulk scale synthesis of metal oxide NPs in commercial companies to avoid further ignition problems. The novelty and importance of this manuscript is avoiding the ethanol in the typical water:ethanol mixture as the solvent for the preparation of metal oxide NPs. Ethanol is ignitable, and commercial companies are trying the evade its use. This is especially important these days, as the face mask produced by sonochemistry (SONOMASK) is being sold all over the world by SONOVIA, and it is coated with ZnO.

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