Non‐aqueous Synthesis of Isotropic and Anisotropic Actinide Oxide Nanocrystals

Hudry, Delphine; Apostolidis, Christos; Walter, Olaf; Gouder, T.; Courtois, Eglantine; Kübel, Christian; Meyer, Daniel

doi:10.1002/chem.201200513

Cited by 56 publications

(62 citation statements)

References 51 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fig. 7 shows the SEM images of the samples prepared at different temperatures under otherwise 50 identical conditions (Table 1, sample [17][18][19]. No product was obtained at 80 °C, suggesting the incomplete decomposition of HMTA.…”

Section: Resultsmentioning

confidence: 99%

“…Among them, thorium dioxide, a very important inorganic material in nuclear industry and catalysis, has been prepared using various methods [11][12][13][14][15][16] . For example, different morphologies of small ThO 2 25 nanocrystals, such as branched nanocrystals, nanodots and nanorods, have been synthesized through an organic-phase thermolysis method using thorium acetate and thorium acetylacetonate as the metal source in a mixture solution of oleic acid, oleylamine and octadecene 17,18 . This method has been 30 extended to the synthesis of other actinide oxide nanocrystals, such as UO 2 , NpO 2 , PuO 2 and the mixing oxide of thorium/uranium nanocrystals [19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of ThO₂nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)

2014

View full text Add to dashboard Cite

In this work, ThO 2 nanostructures with various morphologies are synthesized through a hydrothermal approach. The influences of some experimental parameters, such as the concentration of hexamethylenetetramine (HMTA), the amount of sodium dodecyl sulfate (SDS) and the hydrothermal temperature, on the synthesis and morphologies of ThO 2 nanostructures were systematically investigated 10 by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The results showed that ThO 2 nanospheres with a particle size of 59 ± 9 nm could be synthesized at a molar ratio of Th 4+ /HMTA of 0.3 under the reaction temperature of 100 °C. Adding SDS could adjust the diameter of ThO 2 nanospheres from 240 to 71 nm while keeping other parameters as a constant. Furthermore, nanoparticles and the aggregated 15 nanostructures of ThO 2 could be obtained by varying the concentration of HMTA and the amount of SDS. The possible formation mechanism of various ThO 2 nanostructures was also proposed.. Experimental 65All of the reagents were analytical grade and were used as received without further purification. In a typical procedure, 0.114 g (0.2 mmol) thorium nitrate pentahydrate (TNP) and 8.4 mg (0.06 mmol) hexamethylenetetramine (HMTA) was dissolved into 10ml deionized water. The solution was stirred for 15min 70 before being transferred into a 15 ml Teflon-lined autoclave.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of ThO₂nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)

2014

View full text Add to dashboard Cite

show abstract

“…Hudry and co-workers demonstrated such a possibility with the Rietveld refinement of the crystal structure of ultrasmall thorium, uranium, and plutonium oxide NCs based on the bulk face-centered cubic (fcc) structure (space group Fm3̅ m). 31,58 The results showed that these ultrasmall NCs adopt a crystal structure that is very close to the bulk one. Nevertheless, large atomic displacement parameters of actinide atoms (unusual for such heavy atoms) suggest deviations from the average bulk structure, which were not quantified.…”

Section: Chemistry Of Materialsmentioning

confidence: 89%

Ultrathin Europium Oxide Nanoplatelets: “Hidden” Parameters and Controlled Synthesis, Unusual Crystal Structure, and Photoluminescence Properties

Hudry

Abeykoon²,

Hoy³

et al. 2015

Chem. Mater.

View full text Add to dashboard Cite

A good understanding of the relationship between the atomic scale structure of ultrasmall europium oxide nanocrystals (NCs) and their photoluminescence properties is of major interest in the design and development of innovative europium-based nanophosphors. As a consequence, the preparation of reliable (controlled size and shape distributions) and structurally well characterized ultrasmall europium oxide NCs is an essential prerequisite to understand the size effects on their photoluminescence properties. First, we reveal that nonaqueous approaches used to synthesize ultrasmall europium oxide NCs are deeply affected by "hidden" parameters that are directly related to the preparation of the reactive mixture. Indeed, trace amounts of products of side reactions and byproducts, such as acetic acid and water, act as growth-directing agents. Second, the challenging problem related to the structural characterization of ultrasmall europium oxide NCs is addressed for the first time by coupling high-resolution transmission electron microscopy and X-ray atomic pair distribution function. The ultrasmall thickness of the as-prepared NCs apparently dictates the crystalline structure, which can no longer be described by the crystal phases of their bulk counterparts. The induced distortions due to the ultrasmall thickness as well as the bonding of the stabilizing organic ligand are strong enough to break down the symmetry and, hence, prevent the europium oxide NCs from accommodating the usual bulk crystal phase. Finally, the formation of such unusual polymorphs of europium oxide has a profound impact on the resulting crystal field, with direct effects on the photoluminescence properties.

show abstract

“…Although the state of the art in this emerging field is still far from the level of complexity that has been reached for stable element‐based nanocrystals (i.e., noble metals, transition metals and rare‐earth elements), achievements in the wet‐chemical preparation of well‐defined actinide‐based nano‐objects have been reported over the past decade. For example, the non‐aqueous colloidal synthesis of uranium oxide nanocrystals was first proposed by Cao and co‐workers and was extended to thorium oxide by our group 5. 6 Additionally, heterodimer uranium oxide/indium oxide nanocrystals were successfully synthesised 7.…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis of Thorium and Uranium Oxide Nanocrystals

Hudry

Apostolidis

Walter

et al. 2013

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

Very little is known about the size and shape effects on the properties of actinide compounds. As a consequence, the controlled synthesis of well-defined actinide-based nanocrystals constitutes a fundamental step before studying their corresponding properties. In this paper, we report on the non-aqueous surfactant-assisted synthesis of thorium and uranium oxide nanocrystals. The final characteristics of thorium and uranium oxide nanocrystals can be easily tuned by controlling a few experimental parameters such as the nature of the actinide precursor and the composition of the organic system (e.g., the chemical nature of the surfactants and their relative concentrations). Additionally, the influence of these parameters on the outcome of the synthesis is highly dependent on the nature of the actinide element (thorium versus uranium). By using optimised experimental conditions, monodisperse isotropic uranium oxide nanocrystals with different sizes (4.5 and 10.7 nm) as well as branched nanocrystals (overall size ca. 5 nm), nanodots (ca. 4 nm) and nanorods (with ultra-small diameters of 1 nm) of thorium oxide were synthesised.

show abstract

Non‐aqueous Synthesis of Isotropic and Anisotropic Actinide Oxide Nanocrystals

Cited by 56 publications

References 51 publications

Synthesis of ThO₂nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)

Synthesis of ThO₂nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)

Ultrathin Europium Oxide Nanoplatelets: “Hidden” Parameters and Controlled Synthesis, Unusual Crystal Structure, and Photoluminescence Properties

Controlled Synthesis of Thorium and Uranium Oxide Nanocrystals

Contact Info

Product

Resources

About

Non‐aqueous Synthesis of Isotropic and Anisotropic Actinide Oxide Nanocrystals

Cited by 56 publications

References 51 publications

Synthesis of ThO2nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)

Synthesis of ThO2nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)

Ultrathin Europium Oxide Nanoplatelets: “Hidden” Parameters and Controlled Synthesis, Unusual Crystal Structure, and Photoluminescence Properties

Controlled Synthesis of Thorium and Uranium Oxide Nanocrystals

Contact Info

Product

Resources

About

Synthesis of ThO₂nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)

Synthesis of ThO₂nanostructures through a hydrothermal approach: influence of hexamethylenetetramine (HMTA) and sodium dodecyl sulfate (SDS)