Temat: silica-titania - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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: 2.

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: 3.

Tytuł:: Nanotechnology for biomedical applications - enhancement of photodynamic activity by nanomaterials
Autorzy:: Ulatowska-Jarża, A.
Pucińska, J.
Wysocka-Król, K.
Hołowacz, I.
Podbielska, H.
Powiązania:: https://bibliotekanauki.pl/articles/200175.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: silver-doped nanomaterials
silica-titania (SiO2-TiO2) materials
photodynamic activity
fluorescence enhancement
Opis:: Over the last two decades nanotechnology has become one of the most dynamically evolving field of research. The unique properties of nanomaterials, not disclosing at microscale, are examined and exploited to extend our understanding of the interactions taking place at atomic or molecular level. Those findings affect research in many areas, like e.g. alternative energy sources, electronics, physics and medicine. In this paper, the possibility of using nanomaterials for the enhancement of photodynamic activity, is discussed. A brief review on drug-delivery facilitating nanomaterials, regarding their characteristic features, is presented. An exemplary application of silver-doped nanomaterials for enhancement of photodynamic properties of two photosensitizers: Photolon and Protoporphyrin IX, is described. Influence of silver-doped nanomaterials addition on the fluorescence intensity of photosensitizers immobilized in silica-titania (SiO2-TiO2) sol was examined via VIS spectroscopy. Influence of sonication on the fluorescence enhancement was also investigated. It was demonstrated that the fluorescence enhancement of photosensitizers depends on the concentration of both: photosensitizer and silver-doped nanoparticles.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 253-261
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Electrokinetic properties of silica-titania mixed oxide particles dispersed in aqueous solution of C.I. Direct Yellow 142 dye – effects of surfactant and electrolyte presence
Autorzy:: Chibowski, Stanisław
Wiśniewska, Małgorzata
Wawrzkiewicz, Monika
Hubicki, Zbigniew
Goncharuk, Olena
Powiązania:: https://bibliotekanauki.pl/articles/1450752.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: silica-titania composite
mixed oxides
zeta potential
solid surface charge density
dye adsorption
surfactant effect
Opis:: The mixed $SiO_2$-$TiO_2$ oxide obtained by the pyrogenic method with the silica:titanium percentage ratio equal to 20:80 (ST80) was used in the experiments. The influence of azo dye C.I. Direct Yellow 142 (DY) adsorption at the mixed oxide-solution interface on the electrokinetic properties of solid particles was studied. To determine solid surface charge density and zeta potential of examined suspensions the potentiometric titration and Doppler laser electrophoresis techniques were applied. The changes in structure of electrical double layer formed on the mixed oxide surface in the dye presence were specified as a function of DY concentration, inorganic salt addition and surfactant introduction. The effects of surfactant type and its concentration were determined. Three surfactants of different ionic character (anionic SDS, cationic CTAB and nonionic Triton X-100) were used in measurements. The obtained electrokinetic characteristics of ST80 mixed oxide dispersed in aqueous solutions with various adsorbate compositions is essential for such suspensions stability.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 6; 6-13
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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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Skocz do pozycji: 6.

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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