2008
DOI: 10.1007/s11237-008-9030-0
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Modification of highly dispersed silica with zirconium acetylacetonate

Abstract: UDC 541.183 N. V. Borisenko, I. Ya. Sulim, and L. I. BorisenkoThe chemisorption of Zr(acac) 4 and the formation of nanoparticles of ZrO 2 on the surface of silica were studied by IR spectroscopy, thermogravimetry, thermal and X-ray phase analysis. The composition was established and the hydrolytic and thermal properties of ºSiOZr(acac) 3 groups were investigated.Chemical reactions of metal (M) chlorides and oxochlorides with surface hydroxyl groups are widely used for the formation of nanoparticles of metal … Show more

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Cited by 7 publications
(9 citation statements)
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“…For both composites, the mass loss in the range 50-190 • C arises primarily due to desorption of intact water [6]. The mass loss in the 190-500 • C range corresponds to destruction of acetylacetonates ligands and removal of volatile carbon components upon oxide formation [29]. This agrees with the DTA curves having the corresponding exothermic peaks.…”
Section: Thermogravimetric Xrf and Nitrogen Adsorption Analysissupporting
confidence: 80%
“…For both composites, the mass loss in the range 50-190 • C arises primarily due to desorption of intact water [6]. The mass loss in the 190-500 • C range corresponds to destruction of acetylacetonates ligands and removal of volatile carbon components upon oxide formation [29]. This agrees with the DTA curves having the corresponding exothermic peaks.…”
Section: Thermogravimetric Xrf and Nitrogen Adsorption Analysissupporting
confidence: 80%
“…By using the variational method, we obtain the total energy and the binding energy of the biexciton singlet ground state in such system as a function of the spacing between the QD surfaces and of the QD radius. Moreover we establish that the spectral shift of the lowtemperature absorption peak [1,2] in such a nanosystem is due to quantum confinement of the energy of the biexciton ground state.…”
Section: Introductionmentioning
confidence: 68%
“…In Refs [1][2][3][4][5], a shift of the spectral peak of the low-temperature absorption was observed also for samples with a QD content of x ≈ (1-2) %. It was noted that, at such a QD content in the samples, one must take into account the interaction between charge carriers localized above the QD surfaces [1 -5].…”
Section: Introductionmentioning
confidence: 94%
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“…The reaction mixture was stirred in the refluxing tube for 1 h. Then, IPA and acetylacetone were removed from the mixture by evacuation. The solid products were dried and calcined at 550 °С and 1100 °С for 1 h. According to [22], the temperature range 500–550 °C corresponds to the destruction of acetylacetonate ligands and complete removal of the volatile carbon components upon oxide formation. But at 550 °C, a high probability of the formation of the amorphous structure takes place, while the temperature of 1100 °C was chosen as sufficient for crystalline structure formation.…”
Section: Methodsmentioning
confidence: 99%