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    Wyświetlanie 1-8 z 8
    Tytuł:
    Porous silicon: fabrication, characterization and photoelectronic applications
    Autorzy:
    Shuihab, Aliyah A.
    Khalf, Surour A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177955.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Anodization
    FTIR & AFM
    Nanocrystalline porous silicon
    XRD
    porosity
    porous silicon
    Opis:
    In this paper, the nanocrystalline porous silicon (PS) films are prepared by electrochemical etching of p-type silicon wafer with current density (15 mA/cm2) and etching times on the formation nanosized pore array with a dimension of around different etching time. The films were characterized by the measurement of XRD, FTIR spectroscopy and atomic force microscopy properties (AFM). We have estimated crystallites size from X-Ray diffraction about nano scale for porous silicon and Atomic Force microscopy confirms the nanometric size Chemical fictionalization during the electrochemical etching show on the surface chemical composition of PS. The etching possesses inhomogeneous microstructures that contain a -Si clusters (Si3–Si–H) dispersed in amorphous silica matrix. From the FTIR analyses showed that the Si dangling bonds of the as-prepared PS layer have large amount of Hydrogen to form weak Si–H bonds. The atomic force microscopy investigation shows the rough silicon surface, with increasing etching process (current density and etching time) porous structure nucleates which leads to an increase in the depth and width (diameter) of surface pits. Consequently, the surface roughness also increase.
    Źródło:
    World Scientific News; 2018, 97; 264-273
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sustainable use of Natural Resources as Alternative for the Hazardous Corrosion Inhibitor of Mild Steel/Dilute Sulfuric Acid Interface: Weight Loss, EIS, AFM and FTIR Studies
    Autorzy:
    Tezeghdenti, M.
    Etteyeb, N.
    Dhouibi, L.
    Kanoun, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/351244.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Acacia Cyanophylla
    inhibition
    corrosion
    mild steel
    electrochemical impedance spectroscopy
    adsorption
    AFM
    Opis:
    Point of present exploration was to figure out the anticorrosion activity of Acacia Cyanophylla (Saligna leaves) extract on the corrosion of mild steel in dilute sulfuric acid medium, using weight loss measurements and electrochemical impedance spectroscopy. The result of the study revealed that the extract act as a potent inhibitor on mild steel in acid medium. The increase in inhibitor concentration and immersion time showed a positive effect on inhibition efficiency. EIS exhibited one capacitive loop which indicates that the corrosion reaction is controlled by charge transfer process. The increase of phase shift (n) in presence of (ACLE) lower surface roughness. This change reveals the adsorption of the inhibitor compound on the steel surface. According to the results of weight loss measurements, the adsorption of the extract on the steel surface can be described by the Langmuir isotherm. The inhibition mechanism of (ACLE) molecules involves physical interaction between the inhibitor and metal surface. Additionally, Protective film formation against acid attack was confirmed by FT-IR and AFM techniques.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 697-707
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study on interactions of ionic collectors with orthoclase
    Autorzy:
    Ozun, S.
    Atalay, M. U.
    Powiązania:
    https://bibliotekanauki.pl/articles/110609.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    collector interactions
    zeta potential
    microflotation
    FTIR
    AFM
    orthoclase
    Opis:
    Flotation and adsorption characteristics of the most commonly used cationic and anionic collectors with high grade orthoclase were investigated through the electrokinetic potential measurement, microflotation, Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) studies. According to the obtained results, orthoclase had high flotation recovery with amine and oleic acid based (OAB) collector at certain pH ranges no flotation response was observed with petroleum sulfonate at different pHs. In contrast to the flotation recovery differences, the electrokinetic potential measurements, FTIR and AFM analyses presented similar adsorption characteristics for all collectors. The results of electrokinetic potential tests showed that amine had a strong influence on the zeta potential of orthoclase. While amine turned the zeta potentials of orthoclase from negative to positive, sulfonate and OAB collector provided slightly more negative zeta potentials at certain pHs. In the case of FTIR and AFM analyses, each collector-treated orthoclase (CTO) sample displayed similar characteristic FTIR bands of CH2 group and micro topographical collector coated patches with different intensities. However, the interactions of each collector with orthoclase surfaces were altered by rinsing with acetone indicating that the interactions were mostly through the electrostatic forces and/or hydrogen bonding.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 955-972
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Miscibility and interactions in chitosan and polyacrylamide mixtures
    Autorzy:
    Lewandowska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1035186.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    AFM
    FTIR analysis
    chitosan
    polyacrylamide
    polymer blends
    surface properties
    Opis:
    In the present work, the results of Fourier transform infrared (FTIR) and atomic force microscopy (AFM) studies of films of chitosan acetate (ChA), polyacrylamide (PAM), and their mixtures are presented. The morphology of the ChA and PAM films and their mixtures was studied by tappingmode atomic force microscopy (AFM). The topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of mixtures by AFM showed a completely different morphology when compared with pure components. The roughness of mixtures increases with the increase of ChA content but is significantly reduced after UV exposure. This may indicate a strong interaction between the polymeric components. The FTIR spectroscopy also supports the obtained results. The miscibility of polymer mixtures is related to interactions between the functional groups of the polymeric components.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 65-71
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fouling membran półprzepuszczalnych podczas oczyszczania wody metodą ultra- i mikrofiltracji - przegląd piśmiennictwa
    The fouling of semi-permeable membranes during water treatment by use of UF/MF proces - review
    Autorzy:
    Bodzek, M.
    Płatkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/296721.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    NOM
    fouling
    membrany
    HPSEC
    SEM/AFM
    FTIR
    koagulacja
    PAC
    membranes
    coagulation
    Opis:
    Procesom membranowym uzdatniania wody i oczyszczania ścieków towarzyszy nieodłącznie zjawisko zmniejszania wydajności i żywotności membran zwane foulingiem. Pierwszym krokiem do ograniczenia foulingu jest poznanie natury tego zjawiska. Pozwalają na to dostępne techniki analityczne, takie jak: SEM, AFM, FTIR, HPSEC, analiza OWO, ASA, pomiar kąta zwilżenia oraz potencjału elektrokinetycznego membran czy też frakcjonowanie na żywicach XAD8/4. Stopień foulingu powodowanego przez NOM uzależniony jest m.in. od siły jonowej oraz pH. Zależy on w dużej mierze od właściwości filtrowanej wody, w tym hydrofilowości/hydrofobowości jej składników. Duża część badaczy obarcza frakcję hydrofobową odpowiedzialnością za fouling. Dla procesów niskociśnieniowych zaobserwowano wpływ rozmiaru cząstek filtrowanej frakcji (im mniejsze, tym większy obserwowany spadek strumienia oraz opór filtracji) na zjawisko foulingu. Zidentyfikowano 4 kategorie NOM, które uważane są za silne foulanty, a mianowicie białka, aminocukry, polisacharydy i związki poli(hydroksy-aromatyczne). Znaczenia ma również rodzaj membrany. W zdecydowanej większości prac zaobserwowano większą tendencję do foulingu w przypadku membran hydrofobowych niż hydrofilowych, co tłumaczono adsorpcją ujemnie naładowanych grup funkcyjnych NOM na dodatnio naładowanych powierzchniach membrany. Obecnie stosowane są różne procesy wstępnego przygotowania nadawy, mające na celu zwiększenie jakości wody i/lub wydajności membran. Koagulacja oraz adsorpcja na węglu aktywnym są polecane przy minimalizacji foulingu związanego z dużymi stężeniami poli(hydroksy-aromatów), proces utlenienia natomiast jest zalecany do zmniejszania foulingu powodowanego polisacharydami.
    During membrane water and wastewater processes reduction of capacity and membranes lifetime can be observed. Those phenomena are caused by membrane fouling. To limit the influence of fouling on the efficiency of membrane processes detailed recognition of its nature is required. This can be done using available analytical technologies like: electron microscopy (SEM, AFM), infrared spectroscopy (FTIR), high performance size exclusion chromatography (HPSEC), TOC analysis, atomic absorption spectroscopy (AAS), measurement of contact angle and zeta potential or fractionation on XAD8/4 resins. The influence of fouling caused by NOM mainly depends on ionic strength and pH, but also on properties of filtrated water, including hydophobicity/hydrophilicity of its components. Resent scientific reports suggest that the hydrophobic water fraction has a significant impact on fouling. Size of molecules of filtrated fraction is responsible for fouling occurring fouling during low-pressure membrane processes (the smallest size of molecules the highest flux decline). 4 categories of NOM, which are considered to be strong foulants, were identified. They include: proteins, aminosugars, polysaccharides and poly(hydroxy-aromatics). The membrane composing material also has a meaning. Hydrophobic membranes seem to have greater ability to fouling than hydrophilic ones. It can be explained by the fact, that the positively charged membrane surface tends to adsorb negatively charged functional groups of NOM. Nowadays different water pretreatment processes are applied. Their aim is to improve water quality and/or membrane capacity. Fouling caused by poly(hydroxyl-amines) can be minimized by coagulation or adsorption on activated carbon, while oxidation reduces the fouling induced by polysacharides.
    Źródło:
    Inżynieria i Ochrona Środowiska; 2009, 12, 1; 5-24
    1505-3695
    2391-7253
    Pojawia się w:
    Inżynieria i Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of technological PVD process parameters on the topography, crystal and molecular structure of nanocomposite films containing palladium nanograins
    Autorzy:
    Rymarczyk, J.
    Czerwosz, E.
    Kozłowski, M.
    Dłużewski, P.
    Kowalski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778619.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    palladium
    carbon
    SEM
    AFM
    TEM
    FTIR
    Opis:
    The paper describes the preparation and characteristics of films composed of Pd nanograins placed in carbonaceous matrix. Films were obtained in PVD (Physical Vapor Deposition) process from two sources containing: the first one – fullerene powder and the second one – palladium acetate. The topographical, morphological and structural changes due to different parameters of PVD process were studied with the use of Atomic Force Microscopy and Scanning Electron Microscopy, whereas the structure was studied with the application of the Transmission Electron Microscopy and Fourier Transform Infrared Spectroscopy methods. It was shown that topographical changes are connected with the decomposition ratio of Pd acetate as well as the form of carbonaceous matrix formed due to this decomposition. Palladium nanograins found in all films exhibit the fcc structure type and their diameter changes from 2 nm to 40 nm depending on the PVD process parameters.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 3; 18-24
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Microstructure and Barrier Properties of Silicate Coatings on Low Carbon Steel by Incorporating Colloidal Nano-SiO2
    Autorzy:
    Majdi, M. R.
    Danaee, I.
    Zaarei, D.
    Farzam, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355960.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    colloidal nano-SiO2
    silicate coating
    corrosion
    AFM
    ATR-FTIR
    Opis:
    Silicate coatings have been considered as an alternative to toxic and carcinogenic other chemical treatments. In this paper, a strengthened silicate coating was formed on the surface of low carbon steel by dip immersion method. The modification and strengthening was done by loading colloidal nano-SiO2 into the film. The characterizations of nano-SiO2 were investigated by FESEM, TEM and FT-IR. The effects of nano contents (weight ratio) and drying temperatures on corrosion properties of silicate film were studied. Potentiodynamic polarization, electrochemical impedance spectroscopy and immersion tests have been used to study corrosion behavior of nano-loaded silicate films. Surface morphology, microstructure and its chemical composition were analyzed by means of FESEM, EDS, AFM, XRD, GIXRD, ATR-FTIR and Raman techniques. Results indicated that colloidal nano-SiO2 properly modified the silicate coatings and significantly improved the corrosion resistance and barrier property. Also drying temperature showed a considerable effect in silicate coating and higher corrosion resistance was obtained with 150°C curing.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 627-638
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metal-titanium oxide / quantum dot porous silicon / silicon-metal solar cell
    Autorzy:
    Abd, Ahmad Naji
    Mishjil, Khudheir A.
    Abdulsada, Ali Hamid
    Habubi, N. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177996.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AFM
    FTIR
    TiO2
    X-Ray diffraction
    XRD
    electrochemical etching p-type silicon wafer
    nanocrystalline porous silicon
    Opis:
    In this paper, the nanocrystalline porous silicon (PSi) films are prepared by electrochemical etching of p-type silicon wafer with current density 7 mA/cm2 and etching times on the formation nano-sized pore array with a dimension of around different etching time. The films were characterized by the measurement of XRD, FTIR spectroscopy and atomic force microscopy properties (AFM). We have estimated crystallites size from X-Ray diffraction about nanoscale for porous silicon and Atomic Force microscopy confirms the nanometric size Chemical fictionalization during the electrochemical etching show on the surface chemical composition of PS. The etching possesses inhomogeneous microstructures that contain a-Si clusters (Si3–Si–H) dispersed in amorphous silica matrix. From the FTIR analyses showed that the Si dangling bonds of the as-prepared PS layer have large amount of Hydrogen to form weak Si–H bonds. The atomic force microscopy investigation shows the rough silicon surface, with increasing etching process (current density and etching time) porous structure nucleates which leads to an increase in the depth and width (diameter) of surface pits. Consequently, the surface roughness also increase.
    Źródło:
    World Scientific News; 2018, 96; 134-148
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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