Temat: titania - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Coating of Ordered Large-Pore Mesoporous Silica with TiO₂ Nanoparticles and Evaluation of Its Photocatalytic Activity
Autorzy:: Haghighatzadeh, A.
Mazinani, B.
Abdolahpour Salari, M.
Powiązania:: https://bibliotekanauki.pl/articles/1030097.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: mesoporous
titania
silica
photocatalytic activity
Opis:: In this work, at first large pore size SiO₂ mesostructure was prepared using amphiphilic triblock copolymer (P123) as a template, tetraethyl orthosilicate (TEOS) as Si source and hexane as micelle expander by hydrothermal procedure. Separately, a stable transparent titania sol was synthesized using titanium isopropoxide (TTIP) as titanium source. Then achieved mesoporous silica structure was stirred in the titania sol resulting in formation of a titanium dioxide anatase layer on the silica structure. The sample was characterized with wide angle X-ray diffraction, N₂ adsorption-desorption analysis, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, and energy dispersive X-ray spectroscopy maps of silicon and titanium. The photocatalytic performance of prepared composite material was evaluated using UV-vis spectroscopy as well. The prepared material showed much higher photodegradation of methyl blue (MB) than commercial P-25 which was attributed to high surface area (290 m²/g), anatase phase, small crystallite size and accessible pores.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 420-422
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Effect of Phosphates and Fluorides, Included in TiO2 Nanotube Layers on the Performance of Hydrogen Peroxide Detection
Autorzy:: Arkusz, K.
Krasicka-Cydzik, E.
Powiązania:: https://bibliotekanauki.pl/articles/354114.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: titania nanotubes
thermal modification
biosensor
hydrogen peroxide
Opis:: Titania nanotube (TNT) arrays fabricated by anodizing of titanium foil in organic (ethylene glycol) and inorganic (phosphoric acid) electrolytes and thermally modified in argon revealed much improved properties to detect hydrogen peroxide. Horseradish peroxidase and acetate thionine co-absorbed by a dip coating on the TNT electrode were used to detect hydrogen peroxide in phosphate buffered saline. The morphology and electrochemical properties of TNT arrays were studied by scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry. Well defined oxidation and reduction peaks for potassium ferricyanide have been observed for TNT formed in ethylene glycol and annealed in argon. TNT arrays formed in organic electrolyte and annealed in argon indicated more favorable adsorption and electrochemical properties what was confirmed by detection of hydrogen peroxide towards analyte in phosphorate buffered saline solution.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 2; 765-772
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Synthesis, Characterization and Excellent Photocatalytic Performance of Iron-Carbon-Codoped Mesoporous Titania Nanocrystallines
Autorzy:: Zhang, Dongfang
Gao, Liang
Powiązania:: https://bibliotekanauki.pl/articles/1029986.pdf
Data publikacji:: 2018-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: titania
codoping
visible light
calcination temperature
photocatalytic mechanism
Opis:: Iron-carbon-codoped mesoporous titania nanocrystallines were synthesized by a modified sol-gel method based on the self-assembly technique using polyethylene glycol sorbitan monostearate (Tween 60) as template. The samples were characterized by X-ray diffraction, N_{2} adsorption, UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, photoluminescence, electrochemical impedance spectroscopy, and transient photocurrent responses analysis. The photocatalytic activity of Fe-C-codoped TiO_{2} nanoparticles were evaluated by the degradation of methyl orange (MO), p-nitrophenol (PNP) and biphenol A (BPA) under visible light irradiation. It was found that the as-prepared Fe-C-codoped TiO_{2} sample showed excellent photocatalytic activity compared to undoped TiO_{2}. The highest activity was obtained for Fe-C-codoped TiO_{2} sample calcined at 520°. The enhanced photocatalytic performances were attributed to the synergetic effects of good crystallizing action, appropriate phase composition and slow recombination rate of photogenerated charge carriers. Based on the experimental results, a reasonable photocatalytic mechanism of as-prepared Fe-C-codoped TiO_{2} photocatalysts was also proposed and discussed.
Źródło:: Acta Physica Polonica A; 2018, 133, 5; 1150-1159
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Stability investigation of the pcm nanocomposites
Autorzy:: Cieśliński, Janusz T.
Boroń, Paulina
Fabrykiewicz, Maciej
Powiązania:: https://bibliotekanauki.pl/articles/2233712.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: stability
nano-PCM
experiment
surfactant
alumina
titania
concentration
Opis:: Ensuring the stability is a key issue to be solved for the technical application of nanocomposites. In this work, fatty acid P1801 served as base phase change material (PCM)P1801, and its main ingredients are palmitic acid (58%) and stearic acid (38%). Titania (TiO2) and alumina (Al2O3) with mass concentrations of 1% and 5% were selected as nanoparticles, while polyvinylpyrrolidone (PVP) or oleic acid (OA) with mass concentrations of 5% were tested as surfactants. On the basis of the measured temperature distributions in the sample, which is subject to melting and solidification processes, it was determined which of the tested nanocomposites are stable and which are not. In addition, a thermal test was proposed to assess the stability of the produced nanoPCM, which consists in measuring the temperature distribution versus time according to a precisely given procedure.
Źródło:: Acta Mechanica et Automatica; 2023, 17, 3; 381--389
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Cost-effective titania layers over 100 nm thick : effect of annealing on the structural, morphological, and optical properties
Autorzy:: Zięba, Magdalena
Tyszkiewicz, Cuma
Gondek, Ewa
Wojtasik, Katarzyna
Nizioł, Jacek
Dorosz, Dominik
Starzyk, Bartłomiej
Szymczak, Patryk
Pakieła, Wojciech
Rogoziński, Roman
Karasiński, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/27315694.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: sol-gel
titania layer
dip-coating
surface roughness
optical properties
Opis:: Titania dioxide (TiO₂) layers were synthesized via the acid-catalysed sol-gel route using titania (IV) ethoxide, and then annealed at temperatures varying in the range of 150-700 °C. The research concerned the effect of annealing temperature on the structure of TiO₂ layers, their surface morphology, and their optical properties. Further, X-ray diffractometry, and Raman spectroscopy were used to determine the structure of TiO₂ layers. Scanning electron and atomic force microscopy were used to study the surface morphology of TiO₂ layers. Transmittance, reflectance, absorption edge, and optical homogeneity were investigated by UV-VIS spectrophotometry, while the refractive index and thicknesses of TiO₂ layers were measured using a monochromatic ellipsometer. Chromatic dispersion characteristics of the complex refractive index were determined using spectroscopic ellipsometry. Structural studies have shown that the TiO₂ layers annealed at temperatures up to 300 °C are amorphous, while those annealed at temperatures exceeding 300 °C are polycrystalline containing only anatase nanocrystals with sizes increasing from 6 to 20 nm with the increase of the annealing temperature. Investigations on the surface morphology of TiO₂ layers have shown that the surface roughness increases with the increase in annealing temperature. Spectrophotometric investigations have shown that TiO₂ layers are homogeneous and the width of the indirect optical band gap varies with annealing temperature from 3.53 eV to 3.73 eV.
Źródło:: Opto-Electronics Review; 2023, 31, 4; art. no. e147913
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Microwave assisted sulphated titania catalyzed aldol condensation: Synthesis of some (E) 3-(2-naphthyl)-1-(substituted phenyl)-2-propen-1-ones under solvent-free conditions
Autorzy:: Janaki, P.
Sekar, K. G.
Thirunarayanan, G.
Powiązania:: https://bibliotekanauki.pl/articles/411813.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: aldol condensation
sulphated titania
microwave irradiation
2-propen-1-ones
Opis:: A series of titled chalcones were synthesized by aldol condensation between 2-naphthaldehyde and various substituted acetophenones using solid acidic solid sulphated titania catalyst under microwave irradiation. The yields of these chalcones are more than 90 %. The synthesized chalcones are characterized by their physical constants, analytical and spectroscopic data.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 9; 16-22
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Mitigating the bending losses of the silica-titania-based rib waveguide structure
Autorzy:: Shahbaz, Muhammad
Kozłowski, Łukasz
Butt, Muhammad A.
Piramidowicz, Ryszard
Powiązania:: https://bibliotekanauki.pl/articles/2204159.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: photonic integrated chips
waveguides
silica-titania
ridge waveguide
strip waveguide
Opis:: Optical waveguides (WGs) are widely used as interconnects in integrated optical circuits both for telecommunication and sensing applications. There are different kind of optical WG designs that offers different guiding parameters, opening a vast number of possibilities. A silica-titania (SiO₂:TiO₂) rib WG is discussed and examined by a numerical analysis in this article with a great emphasis on the analysis of bending losses and optimization. A modal analysis for different basic parameters of the WG is presented with a detailed wavelengthbased modal analysis. Various potential fabrication methods are discussed, however, a solgel method and dip-coating deposition technique are proposed for the low-cost development of such WGs. Moreover, an approach towards minimizing the bending losses by adding an upper cladding layer on the rib WG is presented and described.
Źródło:: Opto-Electronics Review; 2023, 31, 1; art. no. e145551
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Titania/mesoporous silica nanotubes with efficient photocatalytic properties
Autorzy:: Cendrowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/778607.pdf
Data publikacji:: 2018
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: mesoporous silica nanotubes
silica-titania nanocomposite
photocatalysis
phenol decomposition
Opis:: Ordered nanocrystalline titania-mesoporous silica nanotube structures are synthesized by hydrolysis of the titania precursor inside pours silica shell. Silica coating surrounding carbon nanotubes was further removed by thermal reduction. The proposed method of functionalization silica channels with the titania nanoparticles preclude aggregation of TiO₂ nanoparticles. The nanocrystalline silica/titania (mt-SiO₂ /TiO₂ ) nanotubes were prepared according to the describe method has high specific surface area and possesses excellent photocatalytic properties capable of decomposing phenol and methylene blue in a short time. Since the nanocrystalline TiO₂ is produced in the wall of the mesoporous silica tube, phenol or dye molecules can react with TiO₂ nanoparticles from both the inside and outside.
Źródło:: Polish Journal of Chemical Technology; 2018, 20, 1; 103-108
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Elektrochemiczna detekcja interleukiny-6 na podłożu nanotubularnym ditlenku tytanu
Electrochemical detection method for interleukin-6 on titania nanotube platforms
Autorzy:: Arkusz, K.
Nycz, M.
Paradowska, E.
Krasicka-Cydzik, E.
Powiązania:: https://bibliotekanauki.pl/articles/283773.pdf
Data publikacji:: 2014
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: nanorurki ditlenku tytanu
IL-6
biosensor elektrochemiczny
titania nanotubes
electrochemical biosensor
Opis:: Celem przeprowadzonych badań było opracowanie elektrochemicznych biosensorów do wykrywania obecności prozapalnej cytokiny, interleukiny 6 (IL-6), w roztworze soli fizjologicznej buforowanej fosforanami (phosphate bufferred saline PBS). Do tego celu wykorzystano nowe, modyfikowane powierzchniowo warstwy nanorurek ditlenku tytanu (TNT – titania nanotubes) wytworzone w procesie anodowania folii tytanu w roztworze glikolu etylenowego. Warstwy TNT poddano obróbce termicznej poprzez wyżarzanie w atmosferze argonu i funkcjonalizowano przez bezpośrednią immobilizację przeciwciał cytokiny IL-6 na ich powierzchni metodą nakraplania. Oznaczenie stężenia IL-6 w roztworze PBS badano za pomocą dwóch typów biosensorów elektrochemicznych: impedancyjnego i amperometrycznego, wykorzystując oddziaływania pomiędzy ludzkim przeciwciałem monoklonalnym IL-6 i antygenem IL-6. Działanie biosensora impedancyjnego polegało na określeniu zmian wartości pojemności elektrycznej warstwy powierzchniowej (a równocześnie kąta przesunięcia fazowego jej charakterystyki impedancyjnej) na skutek powstawania kompleksu antygen-przeciwciało IL-6. Do wykrywania antygenu IL-6 w biosensorze amperometrycznym zastosowano natomiast przeciwciało IL-6 skoniugowane z peroksydazą chrzanową (HRP). Limity detekcji IL-6 opracowanych biosensorów wynoszące 5 pg/ml są znacznie niższe od limitu detekcji w obecnie stosowanych testach immunoenzymatycznych ELISA (25 pg/ml). Zarówno korzystne właściwości adsorpcyjne i dobre przewodnictwo elektryczne materiału podłoża biosensorów, umożliwiającego zastosowanie bezpośredniej immobilizacji substancji biologicznych, jak i stosowane dwie metody elektrochemiczne: impedancyjna oraz amperometryczna sprawiają, że opracowana metoda detekcji cytokin jest szybka, tania, selektywna i czuła.
Sensitive electrochemical biosensors for determination of proinflammatory cytokine Interleukin-6 are elaborated. They are based on novel and surface modified layers of titania nanotubes (TNT) formed by anodization of titanium foil in ethylene glycol solution. The TNT layers were thermally improved by annealing in argon and functionalized for biosensing by direct immobilization of biological reagents on their surfaces with the simple drop technique. Strong antibody-antigen interaction was used in two types of electrochemical biosensors: the impedimetric and the amperometric to detect the IL-6 concentrations in phosphate buffered solutions (PBS). The impedimetric biosensor determines changes of capacitance values due to the formation of IL-6 antibody-antigen complex on biosensor platform. Horseradish peroxide (HRP) conjugated antibodies are used to detect IL-6 antigen in the amperometric biosensor. Two novel electrochemical methods allow to detect 5 pg/ml of IL-6 in PBS solution, which is below detection limit 25 pg/ml in currently used enzyme-linked immunosorbent assay (ELISA) tests. The favorable adsorption and electrical conductance properties of the platform material, which allow the direct immobilization of biological substances on its surface and give the possibility to apply two electrochemical techniques: the impedimetric and the amperometric one, ensure the elaborated cytokine detection methods to be fast, inexpensive, selective and sensitive.
Źródło:: Engineering of Biomaterials; 2014, 17, 125; 21-29
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Photodegradation of organic compounds in water
Autorzy:: Brodzik, K.
Walendziewski, J.
Stolarski, M.
Powiązania:: https://bibliotekanauki.pl/articles/778174.pdf
Data publikacji:: 2007
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: fotodegradacja
fotokatalizator
aerożele tytanowo-krzemowe
photodegradation
photocatalyst
titania-silica aerogels
aerogels
Opis:: The application of photocatalytic processes for the decontamination treatment of polluted water has inspired very extensive studies. Titanium dioxide with its large band gap energy and appropriate redox potential was found as one of the most promising semiconductors for the photodegradation of pollutants in the water as well as in gas phase. The titania-silica aerogels obtained by a simple co-hydrolysis method was applied in the photodegradation of the model organic compound. Different ageing times and heat treatment temperatures were found to influence both the activity and the textural properties of the photocatalysts. The obtained aerogels are efficient photodegradation catalysts of methylene blue and allow a removal up to 98 and 78% of the model pollutant from 20 and 500 ppm solutions, respectively.
Źródło:: Polish Journal of Chemical Technology; 2007, 9, 3; 130-133
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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