| Publications on the project |
045 Structural and hydrophobic–hydrophilic properties of nanosilica/zirconia alone and with adsorbed PDMS |
Authors: | Sulym I.Y., Borysenko M.V., Goncharuk O.V., Terpilowski K., Sternik D., Chibowski E., Gun’ko V.M. | |
Summary: | Two nanosilica A-300/zirconia (SZ) composites at zirconia content CZrO2=5 and 20 wt.% were synthesized using a wet impregnation method with zirconium acetylacetonate as a precursor. The specific surface area of SZ is larger than that of A-300 because zirconia is composed of nanoparticles (crystallites of 4 nm in average size at CZrO2=20 wt.%) smaller than those of the initial silica (dav ≈ 11 nm). A-300 and SZ modified by polydimethylsiloxane (PDMS at molecular weight 1700 and 7960) in amounts of 5, 10, 15, 20 and 40 wt.% remained in the powder state with aggregates of primary particles smaller than those of A-300. SZ is more hydrophilic than silica but PDMS/SZ is more hydrophobic (maximum hydrophobic at CPDMS 15–20 or 40 wt.%) than PDMS/A-300. | |
Keywords: | Nanosilica, Grafted nanozirconia, Adsorbed PDMS, Structural characteristics, Hydrophilic–hydrophobic properties, Heat of immersion. | |
Edition: | Appl. Surf. Sci., 2011, V. 258, Iss. 1, P. 270-277. | | | 2011,
1,English |
045 The influence of pre-adsorbed water on adsorption of methane on fumed and nanoporous silicas |
Authors: | Gun’ko V.M., Turov V.V., Bogatyrev V.M., Petin A.Y., Turov A.V., Trachevskyi V.V., Blitz J.P. | |
Summary: | Co-adsorption of water and methane onto fumed (A-300, A-380) and micro/mesoporous (Gasil 200DF) silicas was studied. FTIR and 1H NMR spectroscopy with layer-by-layer freezing-out of bound water were used at different levels of hydration (h = 0.005–1.0 g of water per gram of silica). Methane adsorption was largest (1–2 wt% at T < 280 K) for nanosilica A-300 (SBET = 337 m2/g) at hydration h = 0.1 g of water per gram of silica for a non-equilibrated system. This sample was characterised by a large amount of weakly associated water (δH ≈ 1 ppm), and maximal clustering of all bound water. These conditions provide the increased microporosity necessary for enhanced methane adsorption. Heating and subsequent wetting, or long equilibration of nanosilica, decreased the adsorption of methane. The adsorption of methane on silica 200DF decreased with increasing amounts of pre-adsorbed water, characterised by significant associativity (δH ≈ 5 ppm) at h ≥ 0.005 g/g. | |
Keywords: | Nanosilica, Nanoporous silica gel, Water adsorption, Methane–water co-adsorption, FTIR, 1H NMR. | |
Edition: | Appl. Surf. Sci., 2011, V. 258, Iss. 4, P. 1306-1316. | | | 2011,
1,English |
045 Influence of Metal Content on Structural Characteristics of Inorganic Nanocomposites MxOy/SiO2 and C/MxOy/SiO2 |
Authors: | Bogatyrev V.M., Oranska O.I., Gun'ko V.M., Leboda R., Skubiszewska-Zięba J. | |
Summary: | A set of nanocomposites МxOy/SiO2 and С/МxOy/SiO2 (M = Mg, Mn, Ni, Cu and Zn) was synthesized on the basis of highly
disperse silica A-380 using thermal-oxidative destruction of metal acetates (concentration 0.2, 1.0 and 3.0 mmol/g SiO2)
and carbonization of adsorbed polystyrene (0.5 g of polystyrene per gram of composite). Analysis of phase composition, IR spectral, structural and adsorption characteristics of materials allows us to elucidate some general regularities and differences in the structure of the materials depending on the type of metal and content of deposited phases. | |
Keywords: | | |
Edition: | Chemistry, Physics and Technology of Surface, 2011, V. 2, N 2, P. 135-146. | | | 2011,
1,Russian |
045 Structure of Modifying Component in Nanocomposites Based on Fumed Silica and Mg, Mn, Ni, Zn Oxides |
Authors: | Oranska O.I., Danylenko M.I., Bogatyrev V.M., Gornikov Yu.I. | |
Summary: | By means of X-ray diffraction, transmission electron microscopy, and electron diffraction, the structures of modifying oxides have been studied in the nanocomposites based on fumed silica and oxides of magnesium, manganese, nickel, and zinc obtained from metal acetates by liquid-phase modifying, followed by thermolysis at 600°С. By means of transmission electron microscopy, the formation of crystalline oxide phases Zn, Mn, and Ni in the nanocomposites studied has been shown. | |
Keywords: | | |
Edition: | Chemistry, Physics and Technology of Surface, 2011, V.2, №3, P.258-261. | | | 2011,
1,Russian |
045 Structural characteristics of mixed oxides MOx/SiO2 affecting photocatalytic decomposition of methylene blue |
Authors: | Gun’ko V.M., Blitz J.P., Bandaranayake B., Pakhlov E.M., Zarko V.I., Sulym I.Ya., Kulyk K.S., Galaburda M.V., Bogatyrev V.M., Oranska O.I., Borysenko M.V., Leboda R., Skubiszewska–Zieba J., Janush W. | |
Summary: | A series of photocatalysts based on silica (nanoparticulate) supported titania, ceria, and ceria/zirconia were synthesized and characterized by a variety of techniques including surface area measurements, X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential, surface charge density, and photocatalytic behavior toward methylene blue decomposition. Thermal treatment at 600 °C increases the anatase content of the titania based catalysts detected by XRD. Changes in the infrared spectra before and after thermal treatment indicate that at low temperature there are more Si–O–Ti bonds than at high temperature. As these bonds break upon heating the SiO2 and TiO2 separate, allowing the TiO2 anatase phase to form. This results in an increased catalytic activity for the thermally treated samples. Nearly all titania based samples exhibit a negative surface charge density at pH 7 (initial pH of photocatalytic studies) which aids adsorption of methylene blue. The crystallinity of ceria and ceria/zirconia based catalysts are in some cases limited, and in others non-existent. Even though the energy band gap (Eg) can be lower for these catalysts than for the titania based catalysts, their photocatalytic properties are inferior. | |
Keywords: | Fumed silica substrate, Grafted titania, Ceria, Ceria–Zirconia, Structural characteristics, Crystallinity, Methylene blue, Photocatalysis. | |
Edition: | Appl. Surf. Sci., 2012, V. 258, Iss. 17, P. 6288-6296. | | | 2012,
1,English |
045 Effect of ferrum oxide nanoparticles on thermal destruction of polymethysiloxane adsorbed on silica |
Authors: | Bogatyrov V. M., Galaburda M.V., Pokrovskiy V.A., Mischanchuk B.G. | |
Summary: | Method of temperature-programmed desorption mass spectrometry was used in studies on thermal destruction of polymethylphenylsiloxane on the surface of fumed SiO2 and of nanocomposite Fe2O3/SiO2 with various ratio of components. Bensene evolution (78 a.u.) with Тmaxat 500–580°С and methane (16 а.u.) with Тmax at 680–700 °С was observed for silica surface. In presence of Fe2O3 essential decrease of benzene evolution was took place, accompanied by loss of extremal shape of temperature dependence. Effect of thermal treatment conditions on thermal destruction of adsorbed molecules was considered. | |
Keywords: | | |
Edition: | Surface, 2012, N4 (19), P. 239-245. | | | 2012,
1,Russian |
045 Interfacial behavior of water bound to zirconia/nanosilica with adsorbed poly(dimethylsiloxane) |
Authors: | Gun’ko V.M., Sulym I.Y., Borysenko M.V., Turov V.V. | |
Summary: | The behavior of water bound to silica/zirconia (2.4 wt.%) (at hydration of 50 mg/g) bare or with adsorbed poly(dimethylsiloxane) (PDMS) (5 wt.%) strongly changes in chloroform medium in comparison with air. PDMS and CDCl3 stimulate an increase in size of water structures (clusters, domains) to reduce the contact area (Suw) between water and hydrophobic polymer or weakly polar solvent. Adsorbed water does not completely cover the oxide surface in air since the surface area in contact with unfrozen water is Suw = 63 m2/g at the specific surface area of 290 m2/g. The Suw value decreases by 5–10 times for samples with PDMS in the chloroform or chloroform–acetonitrile dispersion media. | |
Keywords: | Poly(dimethylsiloxane), Zirconia/silica, Bound water, 1H NMR, Cryoporometry, Dispersion medium effects. | |
Edition: | Colloids Surf. A: Physicochem. Eng. Aspects, 2013, V. 426, P. 47–54. | | | 2013,
1,English |
045 Structural features of ZnxOy/nanosilica composites |
Authors: | Gun'ko V.M., Bogatyrov V.M., Oranska O.I., Borysenko L.I., Skubiszewska–Zięba J., Książek A., Leboda R. | |
Summary: | Nanocomposites with nanosilica A380 (SBET = 378 m2/g) and grafted ZnO or/and zinc silicate were prepared using zinc acetate adsorbed onto nanosilica and then treated at 600–900 °C. The samples studied using a variety of methods demonstrated the dependences of the textural and structural characteristics and phase transformations on the amounts of adsorbed precursor and treatment conditions. Thermodestruction of zinc acetate Zn(ac)2 at 600 °C results in the formation of ZnO which is amorphous according to XRD data. However, HRTEM images show the presence of a small amount of ZnO crystallites of 2–5 nm in size. A portion of surface silanols interacts with adsorbed Zn-containing compounds to form Si–O–Zn bonds, a number of which increases with increasing Zn(ac)2 content and heating temperature. Heating at 800–900 °C leads to transformation of ZnO and other structures into crystalline zinc silicate β-Zn2SiO4 with larger particles more strongly packed in aggregates. The specific surface area of the composites decreases with increasing zinc content and heating temperature. | |
Keywords: | Nanosilica, ZnO/SiO2, Zink silicate, Surface structure, Textural characteristics, Electronic structure. | |
Edition: | Appl. Surf. Sci., 2013, V. 276, P. 802–809. | | | 2013,
1,English |
045 Thermal transformations of copper acetylacetonate adsorbed on silica surface |
Authors: | Borysenko M.V., Kulyk K.S., Dyachenko A.G., Cherniavska T.V., Borysenko L.I. | |
Summary: | Using molecular layering method and impregnation of silica Asil-300 with copper acetylacetonate, Cu(acac)2, nanocomposites of CuO/SiO2 have been synthesized containing CuO nanoparticles with crystallite size of 36–88 nm and concentration of 1.6–7.4 wt. %.
The thermal transformations of surface structures of Cu(acac)2 have been studied by infrared spectroscopy and differential thermogravimetry. Heating the adsorbed Cu(acac)2 and chemisorbed –Cu(acac)-groups up to 550 °C leads to the formation of tenorite – monoclinic copper oxide on silica surface. | |
Keywords: | Thermal transformation, copper oxide nanoparticles, silica surface, infrared spectroscopy, differential thermogravimetry | |
Edition: | Chemistry, Physics and Technology of Surface, 2013, V. 4, № 3, P. 320–326. | | | 2013,
1,Russian |
045 Sol-gel synthesis and optical properties of silica glass doped with transition metals |
Authors: | Borysenko M.V., Frolova O.K., Borysenko L.I., Sulym I.Ya., Galaburda M.V., Bogatyrov V.M. | |
Summary: | A new variant of the sol-gel synthesis of the quartz glass activated with transition metal oxide nanoparticles have been developed. The resulting doped glass has a high optical homogeneity, contains ~ 0.3 wt. % OH groups and different high refractive index compared to pure silica glass. | |
Keywords: | | |
Edition: | Surface, 2013, N 5 (20), P. 174–181. | | | 2013,
1,Russian |
045 Dielectric properties and thermal destruction of poly(dimethylsiloxane)/Fe2O3/SiO2 nanocomposites |
Authors: | Galaburda M.V., Klonos, P. Gun’ko V.M., Bogatyrov V.M., Borysenko M.V., Pissis P. | |
Summary: | Thermally stimulated chemical transformation of poly(dimethilsiloxane) (PDMS) adsorbed onto highly disperse Fe2O3/SiO2 was studied using FTIR, thermogravimetry and differential thermal analysis. The influence of active surface sites on this transformation was investigated since iron oxide affects the degradation of PDMS. It was shown that PDMS provides stable (in the 100–500 °C range) hydrophobic properties to SiО2/PDMS depending on PDMS concentration. Differential scanning calorimetry, thermally stimulated depolarization currents and dielectric relaxation spectroscopy techniques were employed to investigate the effects of iron oxide on thermal transitions (in particular glass transition), segmental dynamics and interfacial interactions in PDMS/oxides nanocomposites. | |
Keywords: | Nanosilica, Fe2O3/SiO2 nanocomposite, Poly(dimethilsiloxane), SiО2/PDMS, Thermogravimetry, Differential scanning calorimetry, Thermally stimulated depolarization current, Dielectric relaxation spectroscopy, Hydrophobicity. | |
Edition: | Appl. Surf. Sci, 2014, V. 305, P. 67–76. | | | 2014,
1,English |
045 Catalytic activity of cerium-containing materials in reaction of hydrogen peroxide decomposition |
Authors: | Dmytrenko T.Yu., Kulyk K.S., Voitko K.V., Bakalinska O.N., Borysenko, N.V. Kartel M.T. | |
Summary: | We have studied the effect of crystallinity (micro- and nano-) and size of cerium oxide nanoparticles pristine and deposited on silica A-300 on their catalytic properties in the model reaction of hydrogen peroxide decomposition activity in comparision with enzyme catalase. Affinity constants were calculated by the kinetic data of hydrogen peroxide decomposition. It was found that with decreased degree of cerium oxide dispersion its catalytic properties calculated on the 100 % cerium oxide content was dropped. It is shown that for samples and silica supported catalysts 2 %CeO2/A-300, 5 %CeO2/A-300 activity has an extreme character with a maximum at pH 10.0–10.5. Activity of the enzyme catalase and sample of CeO2 m.c. is relatively low and is practically independent from pH. | |
Keywords: | Cerium dioxide nanoparticles, CeO2/SiO2, hydrogen peroxide decomposition, catalase, affinity constants. | |
Edition: | Chemistry, Physics and Technology of Surface, 2014, V. 5, N3, P. 317-324. | | | 2014,
1,Ukrainian |
| The events in the framework of the project |
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045 2.1. Physics and chemistry of nanomaterials and nanostructures Purpose: Expected results:Release of new product: material Stage 1:Фізико-хімічні основи синтезу нових люмінесцентних матеріалів на основі оксиду церію Stage 2:Фізико-хімічні основи синтезу нових люмінесцентних матеріалів на основі оксиду європію Stage 3:Фізико-хімічні основи синтезу нових люмінесцентних матеріалів на основі оксиду міді Stage 4:Фізико-хімічні основи синтезу нових люмінесцентних матеріалів на основі алюмо-ітрієвого граната (Y3Al5O12) Stage 5:Оптимізація синтезу нових люмінесцентних матеріалів на основі наночастинок оксидів міді, церію, европію та алюмо-ітрієвого граната
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