Chemistry of the Pechini Process in Cerium‐Containing Systems

Todorovsky, D.; Petrova, N.; Getsova, M.; Todorovska, R.; Manolov, Ilia; Groudeva‐Zotova,

doi:10.1002/chin.200529237

Cited by 7 publications

(12 citation statements)

References 1 publication

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“…All the above mentioned features are in accordance with literature data [5]. The rheological features of the two products are presented by means of the data from Table. The characterization carried out on the two water ferrofluids revealed rather good ferrophase coating and consequently ferrofluid stability.…”

Section: Resultssupporting

confidence: 72%

Submicron Structure in Biocompatible Ferrofluids

Matei

Airinei²,

Creangă

2006

Acta Phys. Pol. A

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This paper presents a comparative study between the microstructural features of two water-ferrofluids intended for biological applications. In both cases the ferrophase was prepared by auto-catalytic reaction between ferrous and ferric salts and resulted in magnetite and some maghemite precipitates. The difference is given by the stabilizer molecule: tetramethylammonium hydroxide and, respectively, citric acid. Transmission electron microscopy and atomic force microscopy were utilized for ferrophase size investigation. The evidence of short chains and large aggregates was obtained mainly by atomic force microscopy analysis (the tip diameter being equal to 5 nm). Their role in the ferrofluid rheological properties was studied by carrying out comparative measurements of viscosity and surface tension. Complementary investigation of the ferrofluid composition was done by means of IR absorption spectra. The suitability of the prepared ferrofluids for biological goals was proved by their convenient ferrophase diameter as well as by their stability in time.

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Section: Resultssupporting

confidence: 72%

Submicron Structure in Biocompatible Ferrofluids

Matei

Airinei²,

Creangă

2006

Acta Phys. Pol. A

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“…At least two peculiarities are clearly seen: (i) formation at elevated temperatures of compounds with rather low solubility in EG accompanied by the changes in the colour of the solutions and of the isolated precipitates; (ii) deviations of the composition of the isolated precipitates from the one of the initial solution. The formation of low-soluble compounds is found only in the NO 3− -containing system, and is also observed in the analogous Ce(III) -containing system [26]. Their formation cannot be explained (or at least, not only) with hydrolysis process -the content of water in the studied systems is less than 4 % and such an amount does not cause hydrolysis of the much more hydrolysable Ti 4+ [25].…”

Section: Synthesis Composition and Ir Spectra Of The Complexesmentioning

confidence: 99%

“…The complexation is proven by the band at ∼1610-1600 cm On the basis of the IR-data, the data on the elemental composition and the data from the thermogravimertric analysis of the complexes as well as the results obtained for similar complexes isolated from Pechini-type systems containing more than one metal [21][22][23][24][25][26]28], hypothetic formulae of the complexes synthesized using MnCl 2 as source metal salt may be proposed:…”

Section: Synthesis Composition and Ir Spectra Of The Complexesmentioning

confidence: 99%

“…13 C-NMR on its turn is utilized for confirmation of the eventual deprotonation of the alcoholic OH-groups of the ligands (proven in other citric complexes [22,26,27]. Unfortunately NMR-spectroscopy cannot be applied for Mn-containing samples because of the paramagnetism of Mn itself.…”

Section: Synthesis Composition and Ir Spectra Of The Complexesmentioning

confidence: 99%

“…• C is observed for number of analogous citric complexes [22][23][24][25][26]. Heating Mn(N)Cit-120 and Mn(N)Cit-80 for 2 h at 1000…”

Section: Thermal Decomposition Of the Complexesmentioning

confidence: 99%

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Synthesis and characterization of Mn-, La-Mn- and La-Ca-Mn-citrates as precursors for LaMnO3 and La1−xCaxMnO3

Petrova

Todorovsky

Vasileva³

2005

Open Chemistry

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Mn-, LaMn-and LaCaMn-citrates were synthesized at 60-120 • C in ethylene glycol medium using chlorides or nitrates as metal sources. Their composition, IR spectra and thermal decomposition were studied. Equimolar La/Mn ratio has been established in the complex, prepared from chloride solution with the same initial composition of the metals. In the isolated three-metallic complex the molar ratio of the metals deviates from the composition in the initial solution. The final products of the heating of Mn-and mixed-metal LaMn-citrates at 1000 • C are phase-homogeneous Mn 3 O 4 (hausmannite) and LaMnO 3 respectively. Parasitic phase(s) are observed in La x Ca 1−x Mn y O 3 , produced from LaCaMn-citrate.

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