Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Gubanova, N. N.; Baranchikov, А. Е.; Kopitsa, G. P.; Almásy, László; Angelov, Borislav; Yapryntsev, A. D.; Rosta, L.; Ivanov, V. K.

doi:10.1016/j.ultsonch.2014.11.012

Cited by 21 publications

(15 citation statements)

References 81 publications

(107 reference statements)

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“…First of all, this manifests itself in an increase in the surface fractal dimension D S1 and characteristic size (upper self similarity boundary) R g1 of the particles of the first structural level. We note that in the precipita tion of hydrated zirconium and hafnium oxides an analogous increase in the surface fractal dimension was observed in [44][45][46]. In addition, the degree of aggregation grows for mass fractal clusters D m2 and aggregates D m3 of the second and third structural lev els, respectively.…”

Section: Mesostructure Of Yttrium and Aluminum Hydroxocompounds Precisupporting

confidence: 60%

Mesostructure of yttrium and aluminum basic salts coprecipitated from aqueous solutions under ultrasonic treatment

Yapryntsev

Gubanova

Kopitsa

et al. 2016

J. Synch. Investig.

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The influence of ultrasonic treatment on the micro and mesostructures and fractal characteristics of amorphous powders of yttrium and aluminum basic salts (precursors for the synthesis of neodymium acti vated yttrium-aluminum garnet, Nd:YAG, which were coprecipitated from aqueous solutions by different precipitants, namely, aqueous solutions of ammonia and ammonium bicarbonate) is studied. It is established that ultrasonication applied during the precipitation of the aforementioned powders does not significantly change the structure of the obtained materials but always leads to the formation of structures with a less homogeneous nuclear density, i.e., a more developed surface area. Moreover, the ultrasound assisted precip itation of the hydroxocompounds by ammonium hydrocarbonate results in a certain increase in the surface fractal dimension and the degree of aggregation for mass fractal aggregates of particles.

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Section: Mesostructure Of Yttrium and Aluminum Hydroxocompounds Precisupporting

confidence: 60%

Mesostructure of yttrium and aluminum basic salts coprecipitated from aqueous solutions under ultrasonic treatment

Yapryntsev

Gubanova

Kopitsa

et al. 2016

J. Synch. Investig.

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“…No appreciable difference could be seen between the structure of sonogels and xerogels. In general, sonication applied during synthesis does not affect the size of monomer particles but may influence their secondary aggregation [36,37,39]. In the present materials, the SANS data did not reveal any influence of ultrasonication on the level of the primary particle formation, while the presence of ionic liquid appears to slow down the polycondensation reaction thus leading to increase of the primary particle size.…”

Section: Sans Scattering Curves Of Xerogels (Left) and Sonogels (Righmentioning

confidence: 47%

“…Interparticle interference effects are not included in this model, as in the given q-range there is no visible decrease or increase of the scattering intensity toward low q values. It is known that at a larger magnification, (that is at lower q) the fractal like assembly of the primary particles would be seen [36,37]. Data fitting was performed by the NCNR reduction and analysis package written for the Wavemetrics Igor Pro software [38].…”

Section: Sansmentioning

confidence: 99%

Ultrasonic preparation of mesoporous silica using pyridinium ionic liquid

Putz

Len

Ianăși

et al. 2016

Korean J. Chem. Eng.

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2Mesoporous silica matrices have been prepared via classic acid catalyzed and sono-catalyzed sol-gel routes. Tetramethoxysilan (TMOS) and methyl-trimethoxysilane (MTMS) were used as silica precursors, and N-butyl-3-methylpyridinium tetrafluoroborate ([bmPy][BF4]) was employed as cosolvent and pore template. The ionic liquid (IL) to silica mole ratio was varied between 0.007 and 0.07. Nitrogen adsorption-desorption and small-angle neutron scattering measurements have been used to characterize the obtained materials. The ionic liquid played the role of catalyst that affected the formation of the primary xerogel particles, and changed the porosity of the materials. Ultrasound treatment resulted in microstructure change on the level of the colloid particle aggregates. In comparison with IL containing xerogels, the IL containing sonogels show increased pore diameter, bigger pore volumes and diminished surface areas.

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“…Nano-cauliflower shapes of 1 were obtained by applying ultrasound to a methanolic solution containing the reagents, and single-crystalline materials were obtained by applying a heat gradient (the branched tube method [36]). There are very few reports on the synthesis of nano, cauliflower-shape compounds [52][53][54].…”

Section: Resultsmentioning

confidence: 99%

Preparation of a Novel Nano-scale Lead (II) Zig-Zag Metal–Organic Coordination Polymer with Ultrasonic Assistance: Synthesis, Crystal Structure, Thermal Properties, and NBO Analysis of [Pb(μ-2-pinh)N3 H2O]n

Mirtamizdoust

Bieńko

Hanifehpour

et al. 2016

J Inorg Organomet Polym

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A novel nano, cauliflower-shaped lead(II) metal-organic coordination polymer, [Pb(μ-2-pinh)(N3)OH2]n (1), was synthesized using an ultrasonic method. The nanostructure was characterized by scanning electron microscopy (SEM), X-ray powder diffraction, IR spectroscopy, elemental analysis and thermal analysis. The compound was structurally characterized by single-crystal X-ray diffraction and takes the form of a zigzag onedimensional polymer in the solid-state. The coordination number of the lead(II) ions is six (PbN4O2), with one oxygen and three nitrogen donor atoms derived from two linker organic ligands, one nitrogen atom from a terminal azide anion and one oxygen from coordinated water. It has a stereochemically active lone electron pair, and the coordination sphere is hemidirected. The zigzag 1D chains interact with neighbouring chains through weak interactions, creating a 3D supramolecular metal-organic framework. Lead oxide nanoparticles were obtained by thermolysis of the new nano coordination compound at 180 °C with oleic acid as a surfactant. The morphology and size were further studied using SEM. Natural bond orbital (NBO) analyses demonstrate the electronic properties of the lead centre and other atoms.

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Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Cited by 21 publications

References 81 publications

Mesostructure of yttrium and aluminum basic salts coprecipitated from aqueous solutions under ultrasonic treatment

Mesostructure of yttrium and aluminum basic salts coprecipitated from aqueous solutions under ultrasonic treatment

Ultrasonic preparation of mesoporous silica using pyridinium ionic liquid

Preparation of a Novel Nano-scale Lead (II) Zig-Zag Metal–Organic Coordination Polymer with Ultrasonic Assistance: Synthesis, Crystal Structure, Thermal Properties, and NBO Analysis of [Pb(μ-2-pinh)N3 H2O]n

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