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    Wyświetlanie 1-10 z 10
    Tytuł:
    Morphology and properties of the graphene layer on the copper substrate
    Autorzy:
    Pietrzak, K.
    Olesińska, W.
    Strąk, C.
    Siedlec, R.
    Gładki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778091.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    copper
    graphene
    graphene oxide
    reduced graphene oxide
    Opis:
    The aim of the work presented in the article was to clarify controversial comments about anti-corrosion and mechanical properties of graphene coatings, deposited on copper substrates. It was designed special experimental cycle comprising: preparation of graphene forms and copper, the observation of layers Cu / GO (rGO) after the thermal reduction processes and oxidative test in air at 150°C temperature and 350 h in time. The resulting coatings and graphene layers were subjected to tribological test for hardness. The observed differences in the continuity of the coverage copper surface by graphene forms, allowed to understand the macroscopic effect of increased hardness and wear resistance layers rGO/Cu.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 104-108
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equilibrium and kinetics studies for the adsorption of Ni2+ and Fe3+ ions from aqueous solution by graphene oxide
    Autorzy:
    Konicki, W.
    Aleksandrzak, M.
    Mijowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/778711.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nickel
    iron
    graphene oxide
    adsorption
    kinetics
    Opis:
    In this study, the adsorption of Ni2+  and Fe3+  metal ions from aqueous solutions onto graphene oxide (GO) have been explored. The effects of various experimental factors such as pH of the solution, initial metal ion concentration and temperature were evaluated. The kinetic, equilibrium and thermodynamic studies were also investigated. The adsorption rate data were analyzed using the pseudo-first-order kinetic model, the pseudo-second-order kinetic model and the intraparticle diffusion model. Kinetic studies indicate that the adsorption of both ions follows the pseudo-second-order kinetics. The isotherms of adsorption data were analyzed by adsorption isotherm models such as Langmuir and Freundlich. Equilibrium data fitted well with the Langmuir model. The maximum adsorption capacities of Ni2+  and Fe3+  onto GO were 35.6 and 27.3 mg g-1 , respectively. In addition, various thermodynamic parameters, such as enthalpy (ΔHO), entropy (ΔSO) and Gibbs free energy (ΔGO), were calculated.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 3; 120-129
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of carbon and aluminosilicate nanofillers in XNBR composites designed for protective materials against oils
    Autorzy:
    Krzemińska, S. M.
    Smejda-Krzewicka, A. A.
    Leniart, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778545.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    carboxylated nitrile butadiene rubber
    XNBR composites
    graphene
    graphene oxide
    bentonite
    Opis:
    The objective of the work was to investigate the possibility of application of carbon and bentonite nanoparticles in carboxylated acrylonitrile-butadiene rubber (XNBR) and the related effects of the nanofi llers on the structure, as well as mechanical and barrier properties, of the resulting composites. The composites were designed for use in protective clothing and gloves. XNBR compounds were modifi ed with 2 phr of graphene fl akes, graphene oxide, or modifi ed bentonite, and crosslinked with sulfur-accelerator system. Rubber compounds were prepared using a conventional method with a laboratory rolling mill. The composites were studied in terms of structure (WAXS), surface morphology (AFM), the presence of functional groups (ATR-FTIR) barrier properties against chemical substances (mineral oil) and swelling properties, as well as mechanical properties (abrasion resistance and tensile strength). The composites were characterized by very high resistance to oil permeation (breakthrough time >480 min). The type of nanofi ller added to the XNBR blend in the amount of 2 phr did not signifi cantly affect mechanical parameters.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 2; 15-23
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and properties of cellulose membranes with graphene oxide addition
    Autorzy:
    Fryczkowska, B.
    Wiechniak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/778535.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    cellulose
    ionic liquid
    graphene oxide
    membranes
    transport properties
    Opis:
    The paper presents results of research on the preparation of cellulose membranes with graphite oxide addition (GO/CEL). Initially, a cellulose (CEL) solution in 1-ethyl-3-methylimidazole acetate (EMIMAc) was obtained, to which graphene oxide (GO) dispersed in N,N-dimethylformamide (DMF) was added. From this solution, composite membranes were formed using phase inversion method. It was observed that the GO addition influences the physico-chemical properties of GO/CEL composite membranes, resulting in an increase in their mass per unit area, thickness and density, and a decrease in sorption properties. In addition, the study of transport properties has shown that GO/CEL membranes do not absorb BSA particles on their surface, which prevents the unfavorable phenomenon of fouling. An important feature of the obtained membranes is the specific permeate flux which reaches high values (~124 L/m2 ×h) at 3.8% of the GO addition to the cellulose matrix.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 4; 41-49
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of expanded graphite (EG) and graphene oxide (GO) on physical properties of PET based nanocomposites
    Autorzy:
    Paszkiewicz, S.
    Nachman, M.
    Szymczyk, A.
    Špitalský, Z.
    Mosnáček, J.
    Rosłaniec, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/778760.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    in situ polymerization
    PET
    graphene oxide
    expanded graphite
    Opis:
    This work is the continuation and refinement of already published communications based on PET/EG nanocomposites prepared by in situ polymerization1, 2. In this study, nanocomposites based on poly(ethylene terephthalate) with expanded graphite were compared to those with functionalized graphite sheets (GO). The results suggest that the degree of dispersion of nanoparticles in the PET matrix has important effect on the structure and physical properties of the nanocomposites. The existence of graphene sheets nanoparticles enhances the crystallization rate of PET. It has been confirmed that in situ polymerization is the effective method for preparation nanocomposites which can avoid the agglomeration of nanoparticles in polymer matrices and improve the interfacial interaction between nanofiller and polymer matrix. The obtained results have shown also that due to the presence of functional groups on GO surface the interactions with PET matrix can be stronger than in the case of exfoliated graphene (EG) and matrix.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 4; 45-50
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoplastic elastomers containing 2D nanofillers: montmorillonite, graphene nanoplatelets and oxidized graphene platelets
    Autorzy:
    Paszkiewicz, S.
    Pawelec, I.
    Szymczyk, A.
    Rosłaniec, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/779218.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    montmorillonite
    graphene oxide
    graphene nanoplatelets
    thermoplastic elastomers
    in situ polymerization
    Opis:
    This paper presents a comparative study on which type of platelets nanofiller, organic or inorganic, will affect the properties of thermoplastic elastomer matrix in the stronger manner. Therefore, poly(trimethylene terephthalate-block-poly(tetramethylene oxide) copolymer (PTT-PTMO) based nanocomposites with 0.5 wt.% of clay (MMT), graphene nanoplatelets (GNP) and graphene oxide (GO) have been prepared by in situ polymerization. The structure of the nanocomposites was characterized by transmission electron microscopy (TEM) in order to present good dispersion without large aggregates. It was indicated that PTT-PTMO/GNP composite shows the highest crystallization temperature. Unlike the addition of GNP and GO, the introduction of MMT does not have great effect on the glass transition temperature of PTMO-rich soft phase. An addition of all three types of nanoplatelets in the nanocomposites caused the enhancement in tensile modulus and yield stress. Additionally, the cyclic tensile tests showed that prepared nanocomposites have values of permanent set slightly higher than neat PTT-PTMO.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 74-81
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of physicochemical properties of graphite oxide and thermally exfoliated/reduced graphene oxide
    Autorzy:
    Drewniak, S. E.
    Pustelny, T. P.
    Muzyka, R.
    Plis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/779581.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    graphite oxide
    thermally exfoliated/reduced graphene oxide
    topography investigations
    Raman spectroscopy
    elemental analysis
    Opis:
    The aim of the experimental research studies was to determine some electrical properties of graphite oxide and thermally exfoliated/reduced graphene oxide. The authors tried to interpret the obtained physicochemical results. For that purpose, both resistance measurements and investigation studies were carried out in order to characterize the samples. The resistance was measured at various temperatures in the course of composition changes of gas atmospheres (which surround the samples). The studies were also supported by such methods as: scanning electron microscopy (SEM), Raman spectroscopy (RS), atomic force microscopy (AFM) and thermogravimetry (TG). Moreover, during the experiments also the elemental analyses (EA) of the tested samples (graphite oxide and thermally exfoliated/reduced graphene oxide) were performed.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 109-114
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Graphene oxide flake activation via divinylsulfone – a procedure for efficient β-galactosidase immobilization
    Autorzy:
    Trusek, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/779087.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    graphene oxide
    enzyme chemical immobilization
    divinylsulfone
    β-galactosidase
    lactose-free product
    Opis:
    Flaky graphene oxide was activated with divinylsulfone followed by immobilization of the β-galactosidase enzyme. An active and stable preparation was obtained. β-galactosidase stability after immobilization was much higher than with the native enzyme. The half-life time of the immobilized enzyme was estimated as 165 hours, while for the native form, the estimate was only 5 hours. The developed procedure for the preparation of flaked graphene and its use in the chemical immobilization of enzymes can be used for any enzyme. A processing solution for continuous operation was proposed and verified using cow’s milk, with lactose as the hydrolysed substrate, as a dosing stream. Lactose, a milk sugar, was effectively hydrolysed. Product for allergy sufferers who cannot digest lactose has been obtained in this way.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 1; 27-32
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduced graphene oxide and inorganic nanoparticles composites – synthesis and characterization
    Autorzy:
    Onyszko, M.
    Urbaś, K.
    Aleksandrzak, M.
    Mijowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/778813.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    reduced graphene oxide
    platinum nanoparticles
    palladium nanoparticles
    zirconia nanoparticles
    manganese dioxide nanoparticles
    Opis:
    Graphene – novel 2D material, which possesses variety of fascinating properties, can be considered as a convenient support material for the nanoparticles. In this work various methods of synthesis of reduced graphene oxide with metal or metal oxide nanoparticles will be presented. The hydrothermal approach for deposition of platinum, palladium and zirconium dioxide nanoparticles in ethylene glycol/water solution was applied. Here, platinum/reduced graphene oxide (Pt/RGO), palladium/reduced graphene oxide (Pd/RGO) and zirconium dioxide/reduced graphene oxide (ZrO2/RGO) nanocomposites were prepared. Additionally, manganese dioxide/reduced graphene oxide nanocomposite (MnO2/RGO) was synthesized in an oleic-water interface. The obtained nanocomposites were investigated by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), Raman spectroscopy and thermogravimetric analysis (TGA). The results shows that GO can be successfully used as a template for direct synthesis of metal or metal oxide nanoparticles on its surface with a homogenous distribution.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 95-103
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Graphene oxide-assisted synthesis of LiMn2O4 nanopowder
    Autorzy:
    Majchrzycki, Ł
    Michalska, M.
    Walkowiak, M.
    Wiliński, Z.
    Lipińska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/778629.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    LiMn2O4 spinel
    graphene oxide
    sol-gel synthesis
    li-ion battery
    Opis:
    The article reports sol-gel synthesis of nanosized spinel-type lithium manganese oxide LiMn2O4 (LMO) carried out in the presence of graphene oxide (GO) and its electrochemical lithium insertion ability. The synthesis was performed in an aqueous environment with lithium acetate and manganese acetate used as precursors and citric acid as a chelating agent. The material was characterized by X-ray diffraction, SEM microscopy, Raman spectroscopy and cyclic voltammetry. The calcination step totally eliminated graphene from the final product, nevertheless its presence during the synthesis was found to affect the resulting LiMn2O4 morphology by markedly reducing the size of grains. Moreover, potentials of electrochemical lithium insertion/deinsertion reactions have been shifted, as observed in the cyclic voltammetry measurements. Along with the diminished grain size the voltammetric curves of the graphene oxide-modified material exhibit higher oxidation and lower reduction peak currents. The study demonstrates that GO mediation/assistance during the sol-gel synthesis fosters more nanostructured powder and changes the electrochemical characteristics of the product.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 3; 15-19
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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