Highly dispersed silica-supported ceria–zirconia nanocomposites: Preparation and characterization

Sulym, Iryna; Sternik, Dariusz; Oleksenko, L. P.; Lutsenko, L. V.; Borysenko, M.V.; Deryło–Marczewska, Anna

doi:10.1016/j.surfin.2016.08.001

Cited by 26 publications

(14 citation statements)

References 31 publications

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“…To control the morphology and other characteristics of nanoparticles, the synthesis of certain phases (deposits) could be carried out at a surface of nanocarriers with a high-specific surface area [13][14][15][16][17]. Fumed silica is one of the most widely used carriers with a large-specific surface area, high-thermal stability and chemical resistance [14]. The use of fumed silica as a carrier provides the simplicity of the modification methods with easy control of the dispersity of both a deposited phase and whole material as well the structure and surface properties.…”

Section: Introductionmentioning

confidence: 99%

Silica-supported $$\hbox {Ni}_{{x}}\hbox {O}_{{y}}$$, $$\hbox {Zn}_{{x}}\hbox {O}_{{y}}$$ and $$\hbox {Mn}_{{x}}\hbox {O}_{{y}}$$ nanocomposites: physicochemical characteristics and interactions with water and n-decane

et al. 2019

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A series of M x O y /SiO 2 (where M = Ni, Zn and Mn) nanocomposites were synthesized at different M x O y contents (0.2, 1 and 3 mmol per 1 g SiO 2) using a deposition method. The samples were characterized using nitrogen adsorption-desorption, X-ray diffraction, Fourier transform infrared spectroscopy, high resolution transmission electron microscopy and photon correlation spectroscopy. The heat of immersion in water (Q w) and n-decane (Q d) were measured using a microcalorimetry method, and the corresponding values of the hydrophilicity index K h = Q w /Q d were analysed. The formation of M x O y on a silica surface leads to diminishing of the Q w and Q d values (calculated per 1 g of nanocomposites) because of the specific surface area reduction. However, the Q w values calculated per 1 m 2 increase for Zn x O y /SiO 2 and Mn x O y /SiO 2 in comparison with the unmodified silica, and it remains unchanged for Ni x O y /SiO 2. Silica modification with M x O y significantly changes the pH dependence of zeta potential and affects the surface charge density. A shift of the isoelectric point (pH IEP) and a character of the zeta potential ζ (pH) curve are affected by the M x O y phase, and pH IEP shifts toward higher values as follows Mn < Zn < Ni. Keywords. Oxide nanocomposites; Zn x O y /SiO 2 ; Ni x O y /SiO 2 ; Mn x O y /SiO 2 ; physicochemical properties; heats of immersion.

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Section: Introductionmentioning

confidence: 99%

Silica-supported $$\hbox {Ni}_{{x}}\hbox {O}_{{y}}$$, $$\hbox {Zn}_{{x}}\hbox {O}_{{y}}$$ and $$\hbox {Mn}_{{x}}\hbox {O}_{{y}}$$ nanocomposites: physicochemical characteristics and interactions with water and n-decane

et al. 2019

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“…%) and TiO 2 -ZrO 2 /SiO 2 (10 : 10 : 80 wt. %) were synthesized using a liquid-phase method and fumed silica A-300 as a substrate that results in the formation of ZrCeO x /SiO 2 and ZrTiO x /SiO 2 heated at 550 °C (XRD-amorphous phase, but HRTEM images show the presence of crystallites) and 1100 °C (including XRDcrystalline phase) [26][27][28]. Two natural materials: "black clay" (Carpathian region including crystalline quartz, CaCO 3 , smectite with amorphous carbon (coal) and other components) and kaolin clay (Azov region, mainly kaolinite and small admixtures with quartz and clays, e.g.…”

Section: Methodsmentioning

confidence: 99%

Particulate morphology of nanostructured materials

Gun’ko¹,

Oranska²,

Paientko³

et al. 2020

Him. Fiz. Tehnol. Poverhni

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The aim of this study was to develop a technique to analyze the crystalline and particulate morphology of highly disperse complex metal and metalloid oxides, which include both crystalline and amorphous phases, using X-ray diffraction (XRD) data to compute crystallite size distributions (CSD) compared to the particles size distribution functions estimated from high-resolution transmission electron microscopy (TEM) images treated with specific software. Two versions of the XRD treatment methods were used: (i) full profile analysis (FPA) of whole XRD patterns with a self-consistent regularization (SCR) procedure using models for spherical and lamellar crystallites that allows us to estimate relative contributions of crystallites of different shapes; and (ii) analysis of main pure XRD lines with consideration of corrections on an instrumental line profile and background using a regularization procedure with models of spherical or lamellar crystallites. The XRD and TEM based approaches were tested to analyze the crystalline and particulate morphology of various disperse materials: complex (binary and ternary) fumed oxides with silica/alumina, silica/titania, and alumina/silica/titania including crystalline alumina and titania and amorphous silica; nanocomposites CeO 2-ZrO 2 /SiO 2 (10 : 10 : 80 wt.%) and TiO 2-ZrO 2 /SiO 2 (10 : 10 : 80 wt.%) including crystalline and amorphous phases and synthesized using a liquid-phase method and fumed silica A-300 as a substrate; and natural clays of complex composition including several crystalline phases. Obtained results show that the developed approaches to analyze the XRD patterns could be effectively used to compute the CSD in parallel with TEM image treatments, using specific software, for a deeper insight into crystalline and particulate morphology of various disperse materials.

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“…Silica-supported ceria–zirconia nanocomposites were prepared using a liquid-phase method and subjected to thermal treatment at 550 °C for 1 h. The content of grafted CeO 2 was 3 and 10 wt%, and the ZrO 2 content was constant at 10 wt% (CZS1 and CZS2, respectively). The synthesis and physicochemical characteristics of CeO 2 –ZrO 2 –SiO 2 nanooxides were described in detail previously [ 42 , 43 ].…”

Section: Methodsmentioning

confidence: 99%

“…Since the presence of such oxides as CeO 2 and ZrO 2 in MO/PDMS increases the thermal stability [ 21 , 34 , 41 ], the NC based on CeO 2 –ZrO 2 –SiO 2 could be a promising material. Preparation of similar complex nanooxides with a high specific surface was previously described in detail [ 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Nanooxide/Polymer Composites with Silica@PDMS and Ceria–Zirconia–Silica@PDMS: Textural, Morphological, and Hydrophilic/Hydrophobic Features

et al. 2017

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SiO2@PDMS and CeO2–ZrO2–SiO2@PDMS nanocomposites were prepared and studied using nitrogen adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), measurements of advancing and receding contact angles with water, and microcalorimetry. The pore size distributions indicate that the textural characteristics change after oxide modification by poly(dimethylsiloxane) (PDMS). Composites are characterized by mainly mesoporosity and macroporosity of aggregates of oxide nanoparticles or oxide@PDMS nanoparticles and their agglomerates. The FT-IR spectra show that PDMS molecules cover well the oxide surface, since the intensity of the band of free silanols at 3748 cm−1 decreases with increasing PDMS concentration and it is absent in the IR spectrum at C PDMS ≥ 20 wt% that occurs due to the hydrogen bonding of the PDMS molecules to the surface hydroxyls. SEM images reveal that the inter-particle voids are gradually filled and aggregates are re-arranged and increase from 20 to 200 nm in size with the increasing polymer concentration. The highest hydrophobicity (contact angle θ = 140° at C PDMS = 20–40 wt%) is obtained for the CeO2–ZrO2–SiO2@PDMS nanocomposites. The heat of composite immersion in water shows a tendency to decrease with increasing PDMS concentration.

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Highly dispersed silica-supported ceria–zirconia nanocomposites: Preparation and characterization

Cited by 26 publications

References 31 publications

Silica-supported $$\hbox {Ni}_{{x}}\hbox {O}_{{y}}$$, $$\hbox {Zn}_{{x}}\hbox {O}_{{y}}$$ and $$\hbox {Mn}_{{x}}\hbox {O}_{{y}}$$ nanocomposites: physicochemical characteristics and interactions with water and n-decane

Silica-supported $$\hbox {Ni}_{{x}}\hbox {O}_{{y}}$$, $$\hbox {Zn}_{{x}}\hbox {O}_{{y}}$$ and $$\hbox {Mn}_{{x}}\hbox {O}_{{y}}$$ nanocomposites: physicochemical characteristics and interactions with water and n-decane

Particulate morphology of nanostructured materials

Nanooxide/Polymer Composites with Silica@PDMS and Ceria–Zirconia–Silica@PDMS: Textural, Morphological, and Hydrophilic/Hydrophobic Features

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