Synthesis of Nanosized Gadolinium Oxide

Нифталиев, С. И.; Кузнецова, И. В.; Саранов, И. А.; Zhundrikova, T. V.; Лыгина, Л. В.; Tuneekov, V. Yu.; Числова, И. В.; Zvereva, Irina A.

doi:10.1134/s1087659619030064

Cited by 8 publications

(7 citation statements)

References 8 publications

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“…To obtain information on the dehydration process, the concepts of kinetics in solid phase systems were used [17]. The sol dehydration reaction refers to the processes of the type: A (solid) → B (solid) + C (gas).…”

Section: Resultsmentioning

confidence: 99%

“…where A-is the pre-exponential factor, Ea-is the activation energy. According to the technique described in [17], using the data of the Integral curve (α), the dependences (−lg α) on the reciprocal temperature (1000/T) were plotted and linear sections on the graph were marked. For all samples, this approach made it possible to mark 1 linear section of moisture release from the sol, and its slope to the abscissa axis is the activation energy of the dehydration process (Table 4).…”

Section: Resultsmentioning

confidence: 99%

“…For the medical use of the preparations based on Се х Gd у О z , the aggregatively stable sols and non-toxic stabilizers are necessary. Various additives and coatings increase the stability of colloidal solutions of nanoparticles and reduce their aggregation [17]. Poly-and monosaccharides were used [18] to obtain aggregatively stable aqueous sols of cerium dioxide with a particle size of 3-17 nm in both acidic and alkaline media.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and morphology of nanodisperse cerium oxide modified by gadolinium oxide

Нифталиев

Кузнецова

Vlasov

et al. 2020

J Sol-Gel Sci Technol

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Stable sols were obtained in the CeO 2-Gd 2 O 3 system using the stabilizing additive Hamulsion RUGLAP. The formation of phases in the CeO 2-Gd 2 O 3 system with Gd 2 O 3 content of up to 0.07 mol occurs already at the stage of synthesis by the Krekke method. The electrokinetic potential is positive for all samples. A sharp increase in the electrokinetic potential (with Gd 2 O 3 content of over 0.07 mol) is connected with a change in the nature of potential-determining ions of the electrical double layer and the diffusion of excess Gd 3+ ions from the solid core of a colloidal particle into its surface. The absorption spectra were analyzed to determine the band gap of colloidal sol particles. With an increase in the cerium oxide content in the sol with the stabilizer (CeO 2-Stab), the value of the band gap energy for direct and indirect transitions increases. An additional absorption band appears in the sol spectra based on the CeO 2-Gd 2 O 3-Stab system in the 265 ÷ 275 nm wavelength range, the value of the band gap energy for direct transitions 4.46-4.62 eV, presumably, corresponds to solid solutions of Ce 1−y Gd y O 2 type. The suggested stabilizer, which contains silicon oxide, guar gum, and gelatin, is neutral with respect to positively charged sol particles. It is adsorbed on the surface of dispersed particles and isolates them from each other, without causing coagulation of the sol. When gadolinium oxide (0.01 mol) is added to the CeO 2 sol, an average particle size decreases to 13 ± 2.8 nm. The nanoparticles are weakly agglomerated, if Gd 2 O 3 content in the sol is up to 0.05 mol; with increasing gadolinium oxide content the size of agglomerates increases. The processes of sol dehydration proceed in the range of 65-90°C. The activation energy of these processes is in the range of 51-54 kJ/mol. The values of activation energies indicate the presence of moisture in a bound state in the structure of the stabilizing additive Hamulsion RUGLAP.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and morphology of nanodisperse cerium oxide modified by gadolinium oxide

Нифталиев

Кузнецова

Vlasov

et al. 2020

J Sol-Gel Sci Technol

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“…The sol-gel method is a wet-chemical technique that involves several steps: (1) hydrolysis and polycondensation, (2) gelation, (3) aging drying, (4) densification, and (5) crystallization. Niftaliev et al [9] reported gadolinium oxide NPs synthesized by the sol-gel method using Gd(NO 3 ) 3 as the salt precursor and agar-agar as a stabilizer. White gel with a particle size of 145 ± 10 nm was obtained.…”

Section: The Sol-gel Methodsmentioning

confidence: 99%

“…Therefore, numerous synthesis and functionalization strategies have been approached to enhance both systems' intrinsic properties in recent years. The synthesis methods for their preparation include techniques such as sonic-chemical reaction [7], solid-state reaction [8], the sol-gel method [9], polyol method [10], microwave-assisted synthesis [11], the hydrothermal method [12], and combustion synthesis method [13]. These techniques are widely used to produce well-shaped nano-or micro-particles doped with different ions.…”

Section: Introductionmentioning

confidence: 99%

An Overview of Gadolinium-Based Oxide and Oxysulfide Particles: Synthesis, Properties, and Biomedical Applications

et al. 2021

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In the last decade, the publications presenting novel physical and chemical aspects of gadolinium-based oxide (Gd2O3) and oxysulfide (Gd2O2S) particles in the micro- or nano-scale have increased, mainly stimulated by the exciting applications of these materials in the biomedical field. Their optical properties, related to down and upconversion phenomena and the ability to functionalize their surface, make them attractive for developing new probes for selective targeting and emergent bioimaging techniques, either for biomolecule labeling or theranostics. Moreover, recent reports have shown interesting optical behavior of these systems influenced by the synthesis methods, dopant amount and type, particle shape and size, and surface functionality. Hence, this review presents a compilation of the latest works focused on evaluating the optical properties of Gd2O3 and Gd2O2S particles as a function of their physicochemical and morphological properties; and also on their novel applications as MRI contrast agents and drug delivery nanovehicles, discussed along with their administration routes, biodistribution, cytotoxicity, and clearance mechanisms. Perspectives for this field are also identified and discussed.

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Nanoscale Porosity of High Surface Area Gadolinium Oxide Nanofoam Obtained With Combustion Synthesis

Boer

Chen

Cvejn

et al. 2023

Adv Materials Inter

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water purification, as well as other fields of their implementation. Increasing the specific surface area is therefore an obvious pathway to increase the efficiency of materials used in these processes and technologies. This way, less material is needed making particular technology more costeffective and sustainable. An effective way of increasing the surface area of a material is by making its structure porous. An example of such porous materials are nano foams, which can be made with all kinds of materials including metals and metal oxides. [1] Gadolinium is a lanthanide with a partially filled 4f shell, giving it unique optical as well as magnetic properties. It is also known to have a large thermal-neutron capture cross-section which is exploited in various applications. [2,3] At room temperature, gadolinium(III) oxide (Gd 2 O 3 ) has a cubic crystal structure with space group 3 la . Above 1200 °C, the monoclinic structure (space group C2/m) takes over as being the most stable structure, and also a hexagonal phase (space group P4m2) exists at temperatures above 2100 °C. [4] Nanoscale Gd 2 O 3 can be applied in, among others, sensing applications, [5,6] in catalysis for the improvement of sulfur cathode materials for lithium-ion batteries, [7,8] and in the treatment of contaminated water. [9][10][11] For the latter, Nanoscale gadolinium oxide (Gd 2 O 3 ) is a promising nanomaterial with unique physicochemical properties that finds various applications ranging from biomedicine to catalysis. The preparation of highly porous Gd 2 O 3 nanofoam greatly increases its surface area thereby boosting its potential for functional use in applications such as water purification processes and in catalytic applications. By using the combustion synthesis method, a strong exothermic redox reaction between gadolinium nitrate hexahydrate and glycine causes the formation of crystalline nanoporous Gd 2 O 3 . In this study, the synthesis of Gd 2 O 3 nanofoam is achieved with combustion synthesis at large scale (grams). Its nanoscale porosity is investigated by nitrogen physisorption and its nanoscale 3D structure by electron tomography, and the formation process is investigated as well by means of in situ heating inside the transmission electron microscope. The bulk nanofoam product is highly crystalline and porous with a surface area of 67 m 2 g −1 as measured by physisorption, in good agreement with the electron tomographic 3D reconstructions showing an intricate interconnected pore network with pore sizes varying from 2 to 3 nm to tens of nanometers. In situ heating experiments point to many possibilities for tuning the porosity of the Gd 2 O 3 nanofoam by varying the experimental synthesis conditions.

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Synthesis of Nanosized Gadolinium Oxide

Cited by 8 publications

References 8 publications

Synthesis and morphology of nanodisperse cerium oxide modified by gadolinium oxide

Synthesis and morphology of nanodisperse cerium oxide modified by gadolinium oxide

An Overview of Gadolinium-Based Oxide and Oxysulfide Particles: Synthesis, Properties, and Biomedical Applications

Nanoscale Porosity of High Surface Area Gadolinium Oxide Nanofoam Obtained With Combustion Synthesis

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