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Search results for: ALUMINUM FLUORIDE
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Influence of titanium layer on counter electrode on electrical parameters of DSSC
PublicationIn this paper the influence of the Ti layer thickness at counter-electrode on electrical parameters of DSSCs was examined. The transparent conductive oxide – less (TCO-less) counter electrodes (CE) with titanium layers and platinum as catalyst on Bk7 glass were prepared. Thin metallic films were deposited by means of magnetron sputtering (titanium) and Pulsed Laser Deposition (platinum). The counter electrode with Pt layer on Fluorine...
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Laser assisted forming of the surface layer of Al-Si alloy at cryogenic conditions.
PublicationW artykule przedstawiono wpływ powierzchniowego laserowego przetapiania w warunkach kriogenicznych na mikrostrukturę, mikrotwardość i własności korozyjne stopu AlSi13Mg1CuNi. Stwierdzono korzystny wpływ obróbki laserowej na mikrostrukturę, mikrotwardość i odporność na zużycie ścierne badanego stopu aluminium.
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Solvothermal growth of {0 0 1} exposed anatase nanosheets and their ability to mineralize organic pollutants. The effect of alcohol type and content on the nucleation and growth of TiO2 nanostructures
PublicationHerein, the series of {0 0 1} exposed anatase nanosheets from HF-assisted solvothermal growth synthesis were obtained. The two-dimensional TiO2 were characterized, including both bulk (XRD, DR-UV–Vis, Mott-Schottky) and surface characteristics (N2 sorption, XPS, SEM) with experimental results compiled with Density Functional Theory (DFT) calculations. The effect of alcohol amount and type was studied, demonstrating the crucial...
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Experimental Study on the Effectiveness of Polyurethane Flexible Adhesive in Reduction of Structural Vibrations
PublicationThe aim of the present study is to consider the idea of using polyurethane flexible adhesive in to reduce the vibrations in structures exposed to dynamic loads and evaluate their damping properties in relation to large deformations. Firstly, two aluminium cantilever beams, simulating structural elements (without and with polyurethane layer in the form of tape), were analysed, in order to check the damping of the unconstrained polymer...
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New potent STS inhibitors based on fluorinated 4-(1-phenyl-1H-[1,2,3]triazol-4-yl)-phenyl sulfamates
PublicationA series of fluorinated analogs based on the frameworks of 4-(1- phenyl-1H-[1,2,3]triazol-4-yl)-phenyl sulfamates have been synthesized as steroid sulfatase (STS) inhibitors. The design of chemical structures of new potential STS inhibitors was supported by molecular docking techniques to identify potential interactions between inhibitors and amino acid residues located in the STS active site. The STS inhibitory potency was evaluated...
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Protective properties of Al2O3 + TiO2 coating produced by the electrostatic spray deposition method
PublicationMechanical resistance of Al2O3 + TiO2 nanocomposite ceramic coating deposited by electrostatic spray deposition method onto X10CrAlSi18 steel to thermal and slurry tests was investigated. The coating was produced from colloidal suspension of TiO2 nanoparticles dispersed in 3 wt% solution of Al2(NO3)3, as Al2O3 precursor, in ethanol. TiO2 nanoparticles of two sizes, 15 nm and 32 nm, were used in the experiments. After deposition,...
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Corrosion resistance evaluation of Al-based alloys by means of dynamic electrochemical impedance spectroscopy
PublicationW pracy przedstawiono wyniki badań stopów aluminium wykonane za pomocą dynamicznej elektrochemicznej spektroskopii. Na podstawie uzyskanych widm impedancyjnych zostały pokazane zmiany parametrów elektrycznego schematu zastępczego z potencjałem. Stwierdzono, że dodatek magnezu do badanego stopu obniża właściwości przeciwkorozyjne stopu.
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Ireneusz Kreja dr hab. inż.
PeopleGraduated from the mathematical class at the Nicolaus Copernicus High School in Gdańsk (1974). Master of Sciences in Civil Engineering after studies at Gdansk University of Technology (GUT), Poland (1974-1979). Since 1979 became an employee of the GUT. In 1989 earned a Ph.D. degree in Civil Engineering (with grade "Summa cum Laude") from the GUT. In 2008 obtained a D. Sc. (Habilitation) degree in Civil Engineering (with grade...
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Evaluation of the influence of grapevine growing conditions on wine quality
PublicationScientists are increasingly interested in the viticulture concept of terroir, which states that unique properties of wine are strictly related to the environmental conditions under which grapes are cultivated. The aim of the research was to compare the parameters characterizing wines produced in Poland, such as pH, conductivity, total organic carbon (TOC), and concentration of anions (F−, Cl−, NO2−, NO3−, PO43−, SO42−). It was...
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Możliwości łączenia elementów rurowych z wykorzystaniem technologii nagniatania otworów
PublicationW opracowaniu przedstawiono możliwość użycia głowic nagniatających do otworów w wytwarzaniu złączy rurowych z aluminium AA6060. Zamieszczono wyniki badań laboratoryjnych wpływu konstrukcyjnych i technologicznych parametrów złącza, jak długość i szerokość pierścieni oraz naddatek nagniatania, na wartość osiowej siły rozłączającej.
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Analiza zniszczenia noża.
PublicationPrzedmiotem analizy była ocena przyczyn zniszczenia noża kuchennego, wykonanego z nierdzewnej stali z rączką drewnianą i nitowaniem ze stopu aluminium. Podano wyniki przeprowadzonych numerycznych obliczeń wytrzymałościowych. Wykazano, że przyczyną zniszczenia noża było nieprawidłowe usytuowanie otworu pod nit w cześci chwytowej noża.
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Structural characterization of plasmenylcholine photooxidation products.
PublicationZbadano fotoutlenianie PPlsC w obecności rozpuszczalnego w wodzie sensybilizatora (uczulacza) jakim jest tetrasulfonian ftalocyjaniny zawierający aluminium(III). Stosując metody chromatograficzne (HPLC) wyizolowano, zidentyfikowano oraz scharakteryzowano zasadnicze produkty powstające w obecności tlenu podczas ciągłego naświetlania światłem widzialnym o długości fali 610nm.
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Tuning of the plasmon resonance location in Au nanostructures coated with a ultrathin film of Al2O3 – Optical measurements and FDTD simulations
PublicationThe Au nanostructures have been coated with an ultra-thin films of amorphous aluminium oxide. Optical absorption spectra show the influence of the thickness of Al2O3 on plasmon resonance wavelength. The observed red-shift of the resonance location with the increase of the thickness of the Al2O3 film, can be explained by the change in the dielectric function of this film. It allows control of the optical spectra of the coated particles....
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Report no: WOiO /II/46/2015 - Construction node verification test, estimation of breaking load (shear force) and destruction form
PublicationA new generation of tanks for LNG transportation has been designed. Mass reduction forced our customer to use three different materials: austenitic steel, aluminium alloy and LNG compressed wood between them. The expertise concerns structural node between tank foundation and suspension. Expertise contains: description of object of test, test principals, results and conclusions
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KTaO3 a perovskite for water and air treatment
PublicationPerovskites are inorganic compounds that exhibit dielectric properties. These minerals belong to the crystal ceramics family. These compounds are described by the formula: ABX3 where, A and B are 2, 3 or 4 valuable metal ions, and X is an ion of oxygen or fluorine. An example of perovskite is the compound KTaO3. There are many methods for producing KTaO3, but the hydrothermal method is most commonly used. Perovskites can be characterized...
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Peroxymonosulfate-assisted photocatalytic degradation of artificial sweeteners in water
PublicationIn the present study, peroxymonosulfate (PMS) activation was proposed for efficient photocatalytic degradation of aspartame, acesulfame, saccharin, and cyclamate - artificial sweeteners frequently present in wastewaters and surface waters worldwide. The TiO2 nanosheets with exposed {0 0 1} facets were synthesised using the fluorine-free lyophilisation technique as a green concept for the synthesis and used for the photodegradation...
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Al-DIAMOND SCHOTTKY TUNNEL DIODES WITH BARRIER HEIGHT CONTROL
PublicationFew-nanometer-thick very highly boron-doped p-type layers were fabricated at metal-semiconductor interfaces of Schottky barrier diodes formed with aluminum on polycrystalline diamond. Preliminary results show that hermionically-assisted tunneling mechanism results in lower voltage drops at forward biasing of these diodes than expected for the Al-diamond metal-semiconductor potential barrier B. The effective barrier height Bpeff...
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Improvements to the two-phase sandwich method for calculating the melting points of pure metals
PublicationThe thermophysical properties of metal alloys are often investigated via molecular dynamics (MD) simulations.An exact and reliable estimation of the thermophysical parameters from the MD data requires a properly and carefullyelaborated methodology. In this paper, an improved two-phase sandwich method for the determination of the metal meltingtemperature is proposed, based on the solid-liquid equilibrium theory. The new method was...
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Utlenianie anodowe biostopu Ti6Al4V w aspekcie jego zastosowań w implantacji
PublicationStop tytanu z aluminium i wanadem jest jednym z najczęściej używanych stopów tytanu w implantologii. Ti6Al4V charakteryzuje się dobrymi właściwościami i jest względnie tani. Na stopie wytworzono warstwy metodą anodowania, przy zastosowaniu trzech różnych elektrolitów i różnych parametrów procesu. Na wszystkich próbkach otrzymano nanorurki.
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A white phosphor based on oxyfluoride nano-glass-ceramics co-doped with Eu3+ and Tb3+: Energy transfer study
PublicationStrontium fluoride nanocrystals doped separately with Ln3+ = Eu3+ or Tb3+ ions (95SrF2·5LnF2), as well as co-doped with both the ions (95SrF2·Eu4Tb) were synthesized for comparison. Then, glass-ceramics consisting of the mono-doped or di-doped SrF2 nanocrystals incorporated into amorphous silica (90SiO2·9.5SrF2·0.5Ln or 90SiO2·9.5SrF2·0.1EuF3·0.4Tb) were prepared by sol-gel procedure. The studied materials were characterized by...
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Adam Dąbrowski dr inż.
PeopleAdam Dabrowski has obtained a PhD in mechanical engineering from Gdańsk University of Technology and MSc. degree in mechatronics from Technische Universität Hamburg. He has an industry experience in Institute of Aviation Engineering Design Center (Warsaw, Poland) and SICK AG (Hamburg, Germany). Additionally, as an assistant at Gdansk University of Technology he teaught courses on mechanics, space mechanisms and dynamics of space...
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Structure and Stability Characterization of Natural Lake Pigments Made from Plant Extracts and Their Potential Application in Polymer Composites for Packaging Materials
PublicationNatural dyes were extracted from various plant sources and converted into lake pigments based on aluminum and tin. Three different plants (weld, Persian berries, and Brazilwood) were chosen as representative sources of natural dyes. High-performance liquid chromatography (HPLC) and triple-quadrupole mass spectrometry (QqQ MS) were used to identify dyestuffs in the raw extracts. The natural dyes and lake pigments were further characterized...
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Influence of the Tool Rotational Speed on Physical and Chemical Properties of Dissimilar Friction-Stir-Welded AA5083/AA6060 Joints
PublicationAluminum alloys have been successfully used in the railroad and automotive industries because of their potential to significantly reduce component weights, and their good mechanical and anti-corrosion properties. Problems with joining aluminum alloys are characterized by low weldability, which influences the need for studies focused on unconventional methods. The environmentally friendly and low-cost friction-stir-welding method...
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Effect of Processing Parameters on Strength and Corrosion Resistance of Friction Stir-Welded AA6082
PublicationThe friction stir welding method is increasingly attracting interest in the railway sector due to its environmental friendliness, low cost, and ease of producing high-quality joints. Using aluminum alloys reduces the weight of structures, increasing their payload and reducing fuel consumption and running costs. The following paper presents studies on the microstructure, strength, and corrosion resistance of AA6082 aluminum alloy...
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Corrosion Properties of Dissimilar AA6082/AA6060 Friction Stir Welded Butt Joints in Different NaCl Concentrations
PublicationA solid-state friction stir welding method which is increasingly used in the marine and shipbuilding industry, has been developed to produce welds with high mechanical properties. In seawater, the oxide layer of aluminium is attacked by Cl− ions resulting in its disruption and formation of pitting corrosion. It is particularly important to determine the electrochemical properties of the produced welds and to evaluate the efect...
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Determination of the width of the carrier recombination zone in organiclight emitting diodes.
PublicationW pracy mierzono kwantową wydajność elektroluminescencji w diodach dwuwarstwowych z różną grubością emitera w postaci warstwy hydroksychinolinowego kompleksu aluminium (Alq3). Stwierdzono, że szerokość strefy rekombinacji ładunku maleje ze wzrostem natężenia pola elektrycznego od 70 nm(dla E=0.75MV/cm do 40 nm (dla E=1.MV/cm).
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Wpływ dawkowania pasty ściernej na intensywność docierania próbek płaskich
PublicationPrzedstawiono wyniki badań intensywności docierania próbek płaskich ze stopu aluminium, brązu aluminiowego i żeliwa sferoidalnego na docierarce jednotarczowej. Analizowano wpływ okresowego dawkowania elektrokorundowej pasty ściernej na wydajność obróbki w funkcji czasu, w zależności od położenia próbek w separatorach oraz liczby próbek docieranych jednocześnie i wywieranego nacisku jednostkowego.
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Wpływ zmiennych własności adhezyjnych powierzchni klejonych na propagację pęknięcia w złączu Al/laminat epoksydowo - węglowy
PublicationPraca dotyczy oceny efektywności wstępnej obróbki powierzchni klejonych polegającej na zastosowaniu dwóch różnych sposobów obróbki (piaskowanie lub polerowanie), na tej samej próbce naprzemiennie. Badania przeprowadzono na próbce sklejonej z płytki aluminiowej i płytki z laminatu epoksydowo/węglowego z pęknięciem zainicjowanym przez wbicie znormalizowanego klina pomiędzy płytki (wedge test wg. Boeing'a). Badano przebieg propagacji...
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Magnetic hyperfine modulation of charge photogeneration in solid films of Alq3.
PublicationZewnętrzne pole magnetyczne (B=100mT) zwiększa fotoprzewodnictwo w hydro-sychinolinowym kompleksie aluminium (Alq3) o 6%. W silniejszych polach magnetycznych (B>100mT) wielkość efektu osiąga stałą wartość. Zaobserwowane wyniki doświadczalne wyjaśniono biorąc pod uwagę magnetyczno-polową modulację oddziaływań nadsubtelnych singletowych i trypletowych par elektron-dziurawy tworzonych w procesie fotogeneracji ładunku.
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Unraveling a novel microwave strategy to fabricate exposed {001}/{101} facets anatase nanocrystals: Potential for use to the elimination of environmentally toxic metronidazole waste
PublicationThis study present a novel microwave strategy to fabricate highly active anatase particles, exposing {101} and {001} facets. Microwave treatment time was shown to determine the growth of crystals in a certain direction. To the best of our knowledge, it is the first report revealing that the contact time of TiO2 crystals with fluorine ions during the microwave process affects the formed morphology, in particular exposed facets ratio....
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Groundwater Quality in the Gdansk Aquifer System
PublicationThe Gdańsk hydrogeological system consists of three main aquifers: Cretaceous, Paleogene-Neogene and Pleistocene. Chemical composition of groundwater varies between water-bearing beds, although water from Pleistocene and Paleogene-Neogene aquifers shows much similarities. The dominant hydrochemical groundwater types is HCO3-Ca. This type is characteristic for Pleistocene deposits in the Kashubian Lake District where natural chemical...
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Extracellular proteolytic activity of Deinococcus geothermalis
PublicationProduction of extracellular protease by extremophilic bacteria Deinococcus geothermalis cultivated in liquid media containing 0.1% (w/v) of peptone K, 0.1% yeast extract and 0.2% marine salt reached a maximum in 14 h of the cell growth at 45°C and pH 8.0. The enzyme was purified by a two-step procedure using fractionation by a graded ammonium sulphate precipitation technique and gel filtration on Sephadex G-100 column. Protease...
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Powierzchniowa obróbka laserowa stopu Al-Si w warunkach kriogenicznych
PublicationPrzedstawiono sposób krystalizacji metali w warunkach wolnego i ultra szybkiego chłodzenia. Wykorzystanie wiązki lasera umożliwia szybkie nadtopienie określonej warstwy materiału metalicznego, a intensywne chłodzenie sprzyja tworzeniu struktur drobnokrystalicznych, quasi krystalicznych lub amorficznych. W tym aspekcie opracowano obróbkę powierzchniową stopu Al-Si, która w znacznym zakresie zmodyfikuje właściwości użytkowe wymienionego...
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GREENHIB Study of the impact of green corrosion inhibitors for aluminum alloys
ProjectsProject realized in Department of Electrochemistry, Corrosion and Materials Engineering according to 0675/IP2/2016/74 agreement from 2016-10-17
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DSC and TG results for strontium ferrite molybdate: pristine La, or Nb-doped
Open Research DataThis dataset consists of DSC and TG data collected for SFM, LSFM (La-doped) and SFMNb (Nb-doped) compounds, which were undertaken to analyze the reoxidation process of reduced compounds and its transition to double-perovskite structure .The appropriate amount of the powder (~10 mg with 10% tolerance factor) were placed into the alumina crucible and...
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Effect of microstructure on mechanical properties of BA1055 bronze castings
PublicationThe article presents research results performed on aluminum bronze CuAl10Fe5Ni5 (BA1032) castings used for marine propellers. Metallographic studies were made on light microscope and a scanning electron microscope to assess quantitatively and qualitatively the alloy microstructure. It has been shown that the shape, size and distribution of the iron-rich phase precipitates in bronze microstructure significantly affect its mechanical...
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Alternative Energy: Photovoltaic Modules and Systems
PublicationUse of solar energy does not contribute to global warming. The light-to-current conversion (photovoltaic conversion) takes place within solar cells, which in most cases are made of silicon. Solar module consists of many solar cells, which are electrically connected and placed between glass or Tedlar® and framed by an aluminium frame. A number of solar modules and other components form photovoltaic systems. In this entry, a brief...
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Metalowe przegrody i obudowy ścian i dachów. Cz. 3. Wyroby z metali nieżelaznych
PublicationWyroby okładzinowe wykonane z materiałów metalowych stanowią istotny asortyment możliwości stosowanych zewnętrznych okładzin ściennych jak i dachowych. W wielu przypadkach zapewniają funkcje nośne dla fasad ściennych, w tym szklano-metalowych, jak i przekryć dachowych. W budownictwie stosujemy nie tylko materiały metalowe oparte na stali, lecz równie powszechnie wykorzystujemy materiały nieżelazne w postaci miedzi, aluminium,...
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The finite-difference simulation of x-rays propagation through a system of lenses
PublicationThe propagation of X-ray waves through an optical system consisting of 33 aluminum X-ray refractive lenses is considered. For solving the problem, a finite-difference method is suggested and investigated. It is shown that very small steps of the difference grid are necessary for reliable computation of propagation of X-ray waves through the system of lenses. It is shown that the wave phase is a function very quickly increasing...
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Simultaneous Removal of Al, Cu and Zn Ions from Aqueous Solutions Using Ion and Precipitate Flotation Methods
PublicationThis paper presents the results of investigations concerning the simultaneous removal of Al(III), Cu(II), and Zn(II) from dilute aqueous solutions using ion and precipitate flotation methods. The effects of initial solution pH, surface active substance concentration, and the gas velocity on the flotations’ efficiency and course are studied. Experimental results are discussed in terms of physicochemical aspects related to aqueous...
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Antibacterial properties of laser-encapsulated titanium oxide nanotubes decorated with nanosilver and covered with chitosan/Eudragit polymers
PublicationTo provide antibacterial properties, the titanium samples were subjected to electrochemical oxidation in the fluoride-containing diethylene glycol-based electrolyte to create a titanium oxide nanotubular surface. Afterward, the surface was covered by sputtering with silver 5 nm film, and the tops of the nanotubes were capped using laser treatment, resulting in an appearance of silver nanoparticles (AgNPs) of around 30 nm in diameter...
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Study of Cloud Water Samples Collected over Northern Poland
PublicationThe paper gives the results of the first studies on the chemistry of cloud water collected during 3 mo (Aug.–Oct. 2010) in the free atmosphere over the area to the south of the Tri-City (Gdansk-Sopot-Gdynia) conurbation on the Gulf of Gdansk, Poland. Taken from cumulus, stratus, and stratocumulus clouds by means of an aircraft-mounted collector, the water samples were analyzed for the following contaminants: anions (chlorides,...
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High-temperature properties of titanium-substituted yttrium niobate
Publicationhe defect fluorite titanium-doped yttrium niobate samples Y3Nb1−xTixO7−δ have been synthesized and investigated by the means of high-temperature X-ray diffraction, dilatometry, and thermogravimetry. Thermal expansion coefficients (TECs) as well as chemical expansion coefficients for material with 5, 10, and 15 mol% of titanium were determined. All investigated samples exhibit chemical contraction caused by Ti doping. The values...
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Novel method of initiation stage of stress corrosion cracking monitoring with respect to marine constructions
PublicationKorozja konstrukcji morskich i jednostek pływających stanowi bardzo ważny problem w odniesieniu do aspektów bezpieczeństwa, gdyż w całym okresie eksploatacji narażone są na działanie bardzo agresywnego środowiska i innych czynników eksploatacyjnych. W rezultacie prowadzi to do niespodziewanych kolizji i wypadków. Praca przedstawia zastosowanie dynamicznej elektrochemicznej spektroskopii impedanycjnej (DEIS) do badania inicjacji...
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Wpływ struktury siluminu na skrawalność = Effect of silumin structure on machinability
PublicationBadano odlewy ciśnieniowe ze siluminu EN AC-AlSi7Cu2 pochodzące z dwóch partii różniące się skrawalnością, w zakresie składu chemicznego, mikrostruktury na mikroskopie świetlnym i skaningowym z EDS oraz składu fazowego na dyfraktometrze rentgenowskim. Stop o niższej skrawalności posiadał mniejszą dyspersję eutektyki, większe stężenie tytanu w roztworze aluminium, wydzielenia fazy międzymetalicznej Al i Ti oraz większe skupiska...
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New plasmonic platform for enhanced luminescence of Valrubicin
PublicationLuminescence enhanced by new structure of plasmonic platform with aluminum oxide (Al2O3) buffer layer deposited on gold nanostructures is investigated. Regularly distributed gold nanostructures of average dimension of 50 nm formed the active part of plasmonic platforms. They were manufactured on Corning 1737 glass substrate by melting of gold thin film. The nanostructures were coated by dielectric Al2O3 thin film with thickness...
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Microstructure and residual stresses in surface coatings with PTFE reservoirs
PublicationThe paper presents the results of experimental study into the microstructure and changes in residual stresses resulting from sliding and rolling/sliding loaded interaction between metallic surface coatings with embedded PTFE reservoirs and various counter faces. It was found that before testing surface coatings had compressive residual stresses. Molybdenum coating with all types of PTFE reservoirs displayed, as a result of testing,...
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The effect of preliminary creep-strain on material behavior under LCF tension/compression and pure torsion regimes
PublicationThis paper presents the results of experimental tests of monotonic tension and torsion, creep-rupture and preliminary creep at 200C and 300C, as well as low-cycle fatigue of 2024 T3511 aluminum alloy. The fatigue process was conducted at room temperature for uniaxial tension/compression and torsion. The as-received material and pre-deformed material were also investigated during creep at elevated temperature. Basic monotonic,...
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Badania tribologiczne w warunkach posuwisto-zwrotnego ślizgania stopu AK12(AlSi13Mg1CuNi) po obróbce laserowej w warunkach kriogenicznych
PublicationPrzedstawiono wyniki badań tribologicznych skojarzenia: żeliwo szare 300 i stop odlewniczy aluminium AlSi13Mg1CuNi o powierzchni obrobionej metodą laserowego przetopiania w środowiskach ciekłego azotu. Na tribometrze TP2-1wykonano serię badań oporów, ruchu i zużycia opisanego skojarzenia, w warunkach ślizgania w ruchu posuwisto-zwrotnym, przy smarowaniu mineralnym olejem silnikowym, dla próbek ze stopu Al-Si po obróbce przy różnych...
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Application of the electrochemical quartz crystal microbalance in corrosionstudies
PublicationPrzegląd niniejszy opisuje zastosowania elektrochemicznej wagi kwarcowej (EQCM) w badaniach korozyjnych. Przedstawione zostały dwa główne obszary badań. Jeśli chodzi o badania mechanizmów korozji, mikrowaga elektrochemiczna była wykorzystywana jako narzędzie do testowania korozji miedzi, niklu, cynku, aluminium i stopów. Była użyteczna w określaniu mechanizmów roztwarzania albo pasywacji w różnych warunkach. Drugim kierunkiem wykorzystania...