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Wyszukujesz frazę "titanium oxide" wg kryterium: Temat


Tytuł:
Evaluation of the quality of titanium oxide and copper oxide layers by means of optical microscopy
Autorzy:
Głuszek, A.
Sawicka-Chudy, P.
Wisz, G.
Sibiński, M.
Cholewa, M.
Tematy:
titanium oxide
copper oxide
optical microscopy
histograms
Pokaż więcej
Wydawca:
Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Powiązania:
https://bibliotekanauki.pl/articles/101772.pdf  Link otwiera się w nowym oknie
Opis:
The aim of this paper is to analyse high-resolution optical images of the surface layers of titanium oxide and copper oxide. The materials were produced using the PREVAC Modular Platform for layer deposition located at the University of Rzeszów. Images with a magnification of 50x were obtained using an optical microscope. On the basis of the results obtained, the quality of the layers was evaluated based on the image analysis. The quantitative method of analysis was applied, as a result of which the conditions of the manufacturing process for which the obtained layers had the highest homogeneity were indicated. The minimum range of grey shade counting was from 65 to 150 and the maximum range from 135 to 220. The standard deviation was from 8 to 40%.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Nanocomposite Sulfonated PVDF Membrane
Autorzy:
Juliandri, Juliandri
Rukiah, Rukiah
Ernawati, E. E.
Silitonga, M. P. R.
Nasir, M.
Tematy:
PVDF membrane
nanocomposites
silicon oxide
titanium oxide
Pokaż więcej
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1167197.pdf  Link otwiera się w nowym oknie
Opis:
As a commercial fuel cell membrane, Nafion has disadvantages such as low stability at high temperature and low conductivity at low humidity. Sulfonated Polyvinylidene fluoride (PVDF) is known for good mechanical and thermal properties as a membrane. The purpose of this research is to synthesis a nanocomposite PVDF-TiSiO4 membrane as a potential replacement of Nafion. PVDF sulfonation was performed using concentrated sulfuric acid. The nanocomposites TiSiO4 were synthesized from TiCl4 and TEOS. Ultrasonification was used to insert the nanomaterial to the sulfonated membrane. The infrared spectra analysis shows the peak for the Ti-O-Si angel. SEM-EDX analysis shows that the nanocomposite PVDF-TiSiO4 membrane contents titanium oxide. The conductivity analysis shows the increasing of conductivity on addition of nanomaterials.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocomposite Sulfonated PVDF-TiO2 Membranes as a Potential Alternative for Nafion
Autorzy:
Juliandri, Juliandri
Rukiah, Rukiah
Ernawati, E. E.
Handika, R. S.
Nasir, M.
Tematy:
PVDF membrane
conductivity
nanocomposites
titanium oxide
Pokaż więcej
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1165508.pdf  Link otwiera się w nowym oknie
Opis:
Fuel cell is an alternative renewable energy source which potentially able to replace a fossil fuel. Nowadays, common fuel cell membrane generally used is Nafion. PVDF polymer is another synthetic polymer which has excellent physical and chemical properties. The purpose of this research is to synthesize an alternative fuel cell membrane, using sulfonated PVDF doped with TiO2 nanoparticles. Sol-gel method was performed to synthesize TiO2 nanoparticles, with TiCl4 as precursor. PVDF membranes with variation of TiO2 composition (0, 1, 1.5, and 2%) were prepared with ultrasonic method. The composite membranes then were sulfonated with concentrated sulfuric acid. The composite membranes were characterized with FTIR for functional group analysis, SEM-EDX for morphology analysis, acid-base titration for degree of sulfonation, weight difference for degree of water uptake, and four point lines for conductivity. FTIR spectra of the sulfonated membrane show the existence of sulfonic group at wavenumber of 601, 1400, and 1454 cm-1. The result of SEM-EDX analysis shows that the nanoparticles of TiO2 were not distributed homogenously. Degree of sulfonation of the PVDF-TiO2 2% composite membrane is 19.54%, and its water uptake is 23.34%. The highest conductivity is about 3.17 × 10-3 S cm-1 for the PVDF-TiO2 2% composite membrane that is very close to Nafion’s conductivity, 6.08 × 10-3 S cm-1.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorption properties of stainless steel membranes impregnated with titanium dioxide sorbent
Autorzy:
Bilewicz, A.
Tematy:
high temperature adsorption
titanium oxide
impregnated membrane
Pokaż więcej
Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/147324.pdf  Link otwiera się w nowym oknie
Opis:
High-temperature sorption of corrosion products from primary cooling circuit is an effective method for radiation reduction in pressurize and boiling reactor plants. We have developed a suitable high temperature resistant adsorbent by impregnating a porous stainless steel membrane with titanium oxide. The adsorption studies of corrosion products in soluble and insoluble forms indicate that the stainless steel membrane impregnated with TiO2 combines high affinity of TiO2 for transition metal cations with a high mechanical stability of the porous steel membrane under high-temperature and highpressure conditions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disentangling the impact of morphology on the photoelectrochemical performance of nanostructured anodic $TiO_2$ : a systematic study of anodization potential at constant oxide thickness
Autorzy:
Rodríguez-López, Joaquín
Kromer, Matthew L.
Syrek, Karolina
Cichoń, Krzysztof
Schorr, Noah B.
Sulka, Grzegorz
Opis:
Understanding the photoelectrochemical water oxidation performance ofhighly textured semiconductors requires systematic studies capable of revealing relevantcorrelations among the synthetic methods used, the resulting morphologies, and theirrelationship to activity. Here, we carry out a systematic study on anodized $TiO_{2}$ tounderstand the impact of anodization potential on the transition from a nanoporous to ananoring morphology and its influence on the semiconductor properties and photoassistedwater oxidation. We demonstrate that the applied anodizing potential has a profoundimpact on the material properties, in particular, the morphology of the top layer as well asthe size and shape of nanotubes. The anodized substrates produced at higher potentialspossess superior photoelectrochemical properties, which are ensured by a hierarchicalnanoporous-nanoring morphology, high donor density, and a more positive flat bandpotential. We further confirmed the generation of oxygen at the anodic $TiO_{2}$ under whitelight irradiation through scanning electrochemical microscopy (SECM). This work introduces a methodology to systematicallysynthesize and characterize the features of hybrid semiconductor materials toward materials with improved photoelectrochemicalproperties for renewable energy technologies.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
TiO2 thin films grown on SiO2–Si(111) by the reactive evaporation method
Autorzy:
Grodzicki, M
Wasielewski, R
Mazur, P
Zuber, S
Ciszewski, A
Tematy:
titanium oxide
wettability
X-ray photoelectron spectroscopy
UV radiation
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/173459.pdf  Link otwiera się w nowym oknie
Opis:
TiO2 thin films were grown on silicon substrates using an electron-beam evaporator. Grainy TiO was used as the evaporation material. Temperature substrate during TiO2 growth was relatively low (about 150 °C), what is important for many optoelectronic devices and multilayers mirrors. High vacuum condition allows to maintain clean surfaces substrates before and during oxide growth. The morphology of titanium oxide thin films was ex situ investigated using atomic force microscopy operating in contact mode, X-ray photoelectron spectroscopy, X-ray powder diffractometry, and by means of a contact angle analyzer. The influence of annealing treatment and exposure to UV–VIS radiation on the morphology has been also discussed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The photocatalytic activity of nanocrystalline oxide materials with respect to biomacromolecules.
Aktywność fotokatalityczna nanokrystalicznych materiałów tlenkowych względem biomakrocząsteczek
Autorzy:
Wójtowicz, Agnieszka
Opis:
Tlenek tytanu(IV) jest powszechnie znany z własności fotokatalitycznych, aktywność TiO2 przypada na zakres promieniowania ultrafioletowego. Proces rozszerzenia aktywności materiału na zakres promieniowania widzialnego nazywamy fotosensybilizacją. Aby rozszerzyć te właściwości na zakres widzialny stosuje się modyfikacje. W pracy badano aktywność fotokatalityczną TiO2 modyfikowanego powierzchniowo przez naftalenodiol oraz alizarynę pod kątem wydajności generowania rodników hydroksylowychoraz aktywność fotokatalityczną tych nanomateriałów względem albuminy ludzkiej. Badano również stabilność danych materiałów w roztworach wodnych. Materiały badano za pomocą pomiarów fluorymetrycznych, fotoelektrochemicznych a także zbadano aktywność tych materiałów w obecności albuminy surowicy ludzkiej, które następnie badano za pomocą elektroforezy białka i wykonano test na obecność grup karbonylowych w materiałach naświetlanych w obecności filtra wodnego i filtrów optycznych w zakresie ultrafioletu i światła widzialnego.
The titanium oxide (IV) is widely known for its photocatalytic properties, the activity of TiO2 in the range of ultraviolet radiation. The enlargement process active material visible light range is called photosentization. To extend these properties to the range of visible we used modifications. In this study, the photocatalytic activity of TiO2 modified surface by naphthalenediol and Alizarin for performance generate hydroxyl radicals, and photocatalytic activity of these nanomaterial’s with respect to human albumin. We have also studied the stability of materials in aqueous solutions. The materials were tested using a fluorescence measurement, photoelectrochemical and examined the activity of these materials in the presence of human serum albumin, which then was examined by electrophoresis of the protein and test for the presence of carbonyl groups in the materials irradiated in the presence of a water filter and optical filters in the ultraviolet and visible light .
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne

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