Temat: graphene - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Morphology and properties of the graphene layer on the copper substrate
Autorzy:: Pietrzak, K.
Olesińska, W.
Strąk, C.
Siedlec, R.
Gładki, A.
Tematy:: copper
graphene
graphene oxide
reduced graphene oxide; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/778091.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Graphene-Based Composite Membrane for Water Desalination
Autorzy:: Dybowski, K.
Kowalczyk, P.
Kula, P.
Jeziorna, A.
Atraszkiewicz, R.
Kołodziejczyk, Ł.
Zawadzki, P.
Nowak, D.
Kazimierczak, T.
Kucińska, M.
Tematy:: graphene
desalination
water filtration
polycrystalline graphene
graphene composite; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354170.pdf Link otwiera się w nowym oknie
Opis:: The article presents the results of studies on the efficacy of water desalination (i.e. Elimination of NaCl ions from the solution) using graphene-polyamide composite membranes. The membranę used for filtration consists of a monolayer of polycrystalline graphene on a porous polyamide carrier support (nylon 66). The degree of desalination for an aqueous NaCl solution percolated through the membrane was 18%. In the future this type of membrane may replace the currently used reverse osmosis membranes.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Impact of the Method of Separating Graphene from the Growth Substrate on the Quality of the 2D Material Obtained
Autorzy:: Dybowski, K.
Romaniak, G.
Kula, P.
Jeziorna, A.
Kowalczyk, P.
Atraszkiewicz, R.
Kołodziejczyk, Ł.
Nowak, D.
Zawadzki, P.
Kucińska, M.
Tematy:: graphene
polycrystalline graphene
electrochemical delamination
chemical etching
graphene transfer; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351974.pdf Link otwiera się w nowym oknie
Opis:: This article presents the research results on impact of the method of polycrystalline graphene layers separation from the growth substrate on the obtained carbon material quality. The studies were carried out on graphene sheets obtained by metallurgical method on a liquid metal substrate (HSMG® graphene). The graphene was separated using chemical etching method or the electrochemical delamination method, by separating by means of electrolysis. During electrolysis, hydrogen is emitted on a graphene-covered of cathode (metal growth substrate) as a result of the voltage applied. The graphene layer breaks away from metallic substrate by gas accumulation between them. The results from these separation processes were evaluated by means of different tools, such as SEM, TEM and AFM microscopy as well as Raman Spectroscopy. In summary, the majority of analyses indicate that the graphene obtained as a result of hydrogen delamination possesses higher purity, smaller size and number of defects, its surface is smooth and less developed after the transfer process to the target substrate.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Manufacturing of composites samples with graphene
Wytwarzanie kompozytowych próbek z grafenem
Autorzy:: Wiśniewski, A.
Sałacińska, A.
Szymański, R.
Kunikowska, A.
Tematy:: composite
graphene
composites with graphene; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/213647.pdf Link otwiera się w nowym oknie
Opis:: The article presents the state of knowledge within the scope of graphene production used in polymer matrices composites, as well as methods of obtaining graphene for these composites, including chemical method. The way of obtaining graphene in form of planes with dimensions of90 x 100 mm and the method of manufacturing multilayer composite with graphene were presented. Composites were produced from carbon fiber-epoxy resin prepregs in out of autoclave process. The adhesive film were used as an additional component which allows to transfer of graphene plane on carbon-epoxy resin prepregs and facilitate the consolidation process. In terms of the quality analysis of prepared composite samples results of ultrasonic tests of composites plate without the graphene and with graphene as an A-scan, B-scan, C-scan, S-scan were shown. The use of ultrasonic methods of registration: C-scan type amplitude of the echo and bottom echo signal amplitude, that allows to detect manufacturing defects caused by the mismatch of parallel edges of carbon prepregs, were engaged. The analysis of C-scan images allows to determine the accuracy of the angular orientation of the carbon layers.
W artykule przedstawiono stan wiedzy w zakresie wytwarzania grafenu do zastosowań w kompozytach o osnowach polimerowych, a także metody pozyskiwania grafenu dla tych kompozytów, w tym metodę chemiczną. Przedstawiono sposób pozyskiwania grafenu w formie płaszczyzn o wymiarach 90x100 mm, a także metodę wytwarzania wielowarstwowego kompozytu z grafenem. Kompozyty wytwarzano z preimpregantów węglowo-epoksydowych w procesie bezautoklawowym. Zastosowano klej błonkowy, jako dodatkowy składnik kompozytu pozwalający na przeniesienie płaszczyzn grafenowych na preimpregnat węglowo-epoksydowy oraz ułatwiający proces konsolidacji kompozytu. W zakresie wykonanych analiz jakości przygotowanych próbek kompozytowych przedstawiono wyniki badań ultradźwiękowych płyt kompozytowych bez grafenu i z grafenem w postaci: A-scan, B-scan, C-scan i S-scan. Przedstawiono użycie metody ultradźwiękowej z rejestracją typu C-scan amplitudy echa oraz amplitudy echa dna, która pozwala na wykrycie wad produkcyjnych powstałych w wyniku niedopasowania równoległego krawędzi preimpregnatu węglowego. Z analizy obrazów typu C-scan określono dokładność kątową ułożenia warstw węglowych.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Graphene and graphene oxide in the oil and gas industry
Autorzy:: Jamrozik, A.
Tematy:: drilling
nanotechnologies
graphene
graphene oxide; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/299253.pdf Link otwiera się w nowym oknie
Opis:: Presently, nanotechnology and nanomaterials have found a number of applications in drilling, exploration and production (E&P) works, as well as in the area of refinery and distribution of crude oil and natural gas. Nanomaterials enjoy considerable popularity owing to their new and unique features which differentiate them from classical materials. Graphene is a relatively new material. Currently it occupies the seventh position among the most commonly used nanomaterials in oil and gas industry. This paper presents the properties graphene and graphene oxide and gives an insight into the applicability of graphene and graphene oxide in the oil and gas industry.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Applications of chitosan–graphene oxide nanocomposites in medical science: a review
Autorzy:: Pieklarz, Katarzyna
Tylman, Michał
Modrzejewska, Zofia
Tematy:: biopolymers
chitosan
graphene
graphene oxide
nanomedicine; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Powiązania:: https://bibliotekanauki.pl/articles/1034405.pdf Link otwiera się w nowym oknie
Opis:: Combinations of biopolymers with nanostructured carbon materials have been the subject of interest of many scientists in recent years. Particularly significant are nanocomposites made of chitosan, which is a linear aminopolysaccharide obtained in the process of deacetylation of chitin, and graphene oxide (GO). These systems, due to the atypical properties of both components such as non-toxicity, biocompatibility with human tissues and organs as well as bacteriostaticity, are characterised by a wide range of biomedical applications. They may be used in emergency medicine as dressing materials which accelerate wound healing, as well as carriers of drugs/genes and biological macromolecules, for example proteins, peptides and nucleic acids. In addition, CS-GO systems can potentially be used in regenerative medicine as scaffolds for cell culture. For this reason, the current publication presents the possibilities of the application of chitosan–graphene oxide nanocomposites in medicine considering the characteristics of the system components.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Preparation and properties of nanocrystalline Ni/graphene composite coatings deposited by electrochemical method
Autorzy:: Cieślak, G.
Trzaska, M.
Tematy:: Graphene
electrodeposition
composite coatings
Ni/graphene coatings; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/949445.pdf Link otwiera się w nowym oknie
Opis:: The paper presents results of studies of composite nickel/graphene coatings produced by electrodeposition method on a steel substrate. The method of producing composite coatings with nanocrystalline nickel matrix and dispersion phase in the form of graphene is presented. For comparative purposes, the study also includes nano-crystalline Ni coatings produced by electrochemical reduction without built-in graphene flakes. Graphene was characterized by Raman spectroscopy, transmission and scanning electron microscopes. Results of studies on the structure and morphology of Ni and Ni/graphene layers produced in a bath containing different amounts of graphene are presented. Material of the coatings was characterized by SEM, light microscopy, X-ray diffraction. The microhardness of the coatings was examined by Knoop measurements. The adhesion of the coatings with the substrate was tested using a scratchtester. The influence of graphene on the structure and properties of composite coatings deposited from a bath with different graphene contents was determined.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The sensitivity of sensor structures with oxide graphene exposed to selected gaseous atmospheres
Autorzy:: Pustelny, T.
Drewniak, S.
Setkiewicz, M.
Maciak, E.
Urbańczyk, M.
Procek, M.
Gut, K.
Opilski, Z.
Jagiello, J.
Lipinska, L.
Tematy:: graphene
graphene oxide
gas sensors
resistive sensors; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200229.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of investigations on the resistive structure with a graphene oxide (GO) sensing layer. The effects of dangerous gases (hydrogen and nitrogen dioxide) on the structure were studied; the resistance changes were examined during the flow of the selected gas in the atmosphere of synthetic air. Measurements were performed with a special emphasis on the detection of low concentrations of the analyzed gases. The reactions of the sensing structure to the effect of nitrogen and synthetic air at different humidity were also tested. Much attention was also paid to the fast response of the sensor to the changes in the gas atmosphere. The thin palladium layer (~2 nm) has been applied in order to improve the sensing properties of the structure. The investigations were performed in the temperature range from RT to 120°C and the analyzed gases in synthetic air were batched alternately with pure synthetic air.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Graphene oxide and green-synthesized reduced graphene oxide in chitosanbased nanocomposites
Autorzy:: Kosowska, K.
Domalik-Pyzik, P.
Chłopek, J.
Tematy:: graphene oxide
reduced graphene oxide
chitosan
hydroxyapatite
biomaterial; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284287.pdf Link otwiera się w nowym oknie
Opis:: The first part of the paper concerns synthesis and characterization of two types of nanomaterials: graphene oxide (GO) prepared by modified Marcano method and reduced graphene oxide (rGO) synthesized using green reductant, L-ascorbic acid. Their structural properties were investigated by attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD). Results confirmed that L-ascorbic acid is an effective reducing agent. Intensity of the oxygen-groups decreased dramatically what resulted in reduction of the GO interlayer spacing from 0.8 nm to 0.4 nm. The second part of the research was concentrated on the properties of chitosan nanocomposites modified with GO and rGO. Films were prepared by mixing of the chitosan solution with the nanoparticles dispersion. Scanning electron microscopy (SEM) was used to investigate the microstructure of the composites surface. In addition, wettability and pore size of the freeze-dried scaffolds were evaluated. Results of the mechanical tests (increase in Young’s modulus) and structural characterization confirmed that chitosan solution and GO dispersion can be mixed homogeneously. Reduction of GO during composite synthesis resulted in better dispersion of the nanosheets what increased surface roughness, wettability and stability in distilled water, PBS and Ringer’s solution compared to composite with GO. After detailed biological examination, rGO-modified nanocomposites can be potentially applied in tissue engineering.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Chemical and structural properties of reduced graphene oxide – dependence on the reducing agent
Autorzy:: Trykowski, Grzegorz
Tóth, Jozsef
Rangam, Neha
Lesiak, Beata
Stobinski, Leszek
Kövér, László
Malolepszy, Artur
Biniak, Stanisław
Wydawca:: Springer
Cytata wydawnicza:: Lesiak, B., Trykowski, G., Tóth, J. et al. Chemical and structural properties of reduced graphene oxide—dependence on the reducing agent. J Mater Sci 56, 3738–3754 (2021). https://doi.org/10.1007/s10853-020-05461-1
Opis:: Graphene oxide (GO) prepared from graphite powder using a modified Hummers method and reduced graphene oxide (rGO) obtained from GO using different reductants, i.e. sodium borohydride, hydrazine, formaldehyde, sodium hydroxide and L-ascorbic acid, were investigated using transmission electron microscopy, X-ray diffraction, Raman, infrared and electron spectroscopic methods. The GO and rGOs stacking nanostructure (flake) size (height x diameter), interlayer distance, average number of layers, distance between defects, elementary composition, content of oxygen groups, C sp3 and vacancy defects were determined. Different reductants applied to GO led to modification of carbon to oxygen ratio, carbon lattice (vacancy) and C sp3 defects with various in-depth distribution of C sp3 due to oxygen group reduction proceeding as competing processes at different rates between interstitial layers and in planes. The reduction using sodium borohydride and hydrazine in contrary to other reductants results in a larger content of vacancy defects than in GO. The thinnest flakes rGO obtained using sodium borohydride reductant exhibits the largest content of vacancy, C sp3 defects and hydroxyl group accompanied by the smallest content of epoxy, carboxyl and carbonyl groups due to a mechanism of carbonyl and carboxyl group reduction to hydroxyl groups. This rGO similar diameter to GO seems to result from a predominant reduction rate between the interstitial layers. The thicker flakes of a smaller diameter than in GO obtained in rGOs prepared using remaining reductants result from a higher rate of reduction of in plane defects.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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