Structural and optical features of ureasiloxane–polyethylene oxide hybrids containing CeO2 nanoparticles

Truffault, Laurianne; Magnani, Marina; Hammer, Peter; Santilli, Celso Valentim; Pulcinelli, Sandra Helena

doi:10.1016/j.colsurfa.2015.02.028

Cited by 11 publications

(7 citation statements)

References 27 publications

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“…There are many publications on preparation, structure, and properties of CeO 2 -TiO 2 [3,[12][13][14], CeO 2 -ZrO 2 [2,[14][15][16], TiO 2 -SiO 2 [17], ZrO 2 -SiO 2 [4,9,11,[18][19][20], and CeO 2 (or TiO 2 ) -ZrO 2 -SiO 2 composites [5,6,[21][22][23]. Numerous synthesis routes have been used to prepare binary and ternary oxides including impregnation, sol-gel, co-precipitation, pyrogenic and other methods [22,24,25].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Silica-supported ceria–zirconia and titania–zirconia nanocomposites: Structural characteristics and electrosurface properties

Sulym

Goncharuk

Skwarek

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Introductionmentioning

confidence: 99%

“…Such oxides as SiO 2 , TiO 2 , CeO 2 , and ZrO 2 are important materials for industrial applications [1][2][3][4]. [3,7].…”

Section: Introductionmentioning

confidence: 99%

Silica-supported ceria–zirconia and titania–zirconia nanocomposites: Structural characteristics and electrosurface properties

Sulym

Goncharuk

Skwarek

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…СеО 2 nanoparticles with the size of 4-6 nm were obtained by the sol-gel method in a silicon-containing substance [20]. To stabilize the CeО 2 -Gd 2 О 3 sol, agar-agar was used [21]; the thermal analysis data combined with mass spectrometry indicate crystallization of the solid phases at temperatures of 275.93 and 334.55°С.…”

Section: Introductionmentioning

confidence: 99%

“…The stabilizing additive Hamulsion RUGHAP was chosen due to the fact that it is a food additive containing proteins and carbohydrates in complex. In [18][19][20][21], it was indicated that a component containing only proteins or only carbohydrates should be used to stabilize sols. A complex additive has not been used.…”

Section: Introductionmentioning

confidence: 99%

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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“…The composites exhibit the distinct properties different than that of its initial constituent materials due to large interfacial interaction [14,15]. Thus, a series of nanocomposites were synthesized for their structural characterization and properties, such as TiO 2 -SiO 2 [16], ZrO 2 -SiO 2 [17][18][19][20][21][22], CeO 2 -ZrO 2 [23][24][25][26][27] and CeO 2 -TiO 2 [28][29][30]. Some triphasic composites viz., CeO 2 -ZrO 2 -SiO 2 and TiO 2 -ZrO 2 -SiO 2 were also reported in literature [31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and dielectric properties of $$\hbox {TiO}_{2}$$ TiO 2 – $$\hbox {CeO}_{2}$$ CeO

et al. 2018

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TiO 2(x)-CeO 2(1−x) nanocomposites were prepared at low TiO 2 composition of 5, 10, 15 and 20%, by using TiO 2 and CeO 2 nanoparticles obtained by polymeric citrate precursor method. These nanocomposites were characterized by using powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive analysis of X-rays and BET surface area studies. BET studies showed the specific surface area of as-prepared nanocomposites in the range of 239-288 m 2 g −1. Twenty percent of TiO 2-based titania-ceria nanocomposites have smallest average particle size of 30 nm and highest surface area of 288 m 2 g −1 among all the as-prepared nanocomposites. The dielectric characteristics were measured as a function of frequency and temperature. The dielectric constant of TiO 2(x)-CeO 2(1−x) at room temperature was 35.6 (maximum) at 500 kHz for x = 0.20.

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Structural and optical features of ureasiloxane–polyethylene oxide hybrids containing CeO2 nanoparticles

Cited by 11 publications

References 27 publications

Silica-supported ceria–zirconia and titania–zirconia nanocomposites: Structural characteristics and electrosurface properties

Silica-supported ceria–zirconia and titania–zirconia nanocomposites: Structural characteristics and electrosurface properties

Synthesis and morphology of nanodisperse cerium oxide modified by gadolinium oxide

Synthesis, characterization and dielectric properties of $$\hbox {TiO}_{2}$$ TiO 2 – $$\hbox {CeO}_{2}$$ CeO

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