Log in

Relevant bibliographies by topics / Grafen oxid / Journal articles

To see the other types of publications on this topic, follow the link: Grafen oxid.

Journal articles on the topic 'Grafen oxid'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 32 journal articles for your research on the topic 'Grafen oxid.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Mravik, Željko, and Zoran Jovanović. "Analysis of surface oxygen groups of thermally reduced graphene oxide via temperature programmed desorption method." Tehnika 73, no. 2 (2018): 186–91. http://dx.doi.org/10.5937/tehnika1802186m.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Malta, André Farias de Oliveira, Davi Luiz Cortez, Dayse Andrade Romão, José Eduardo Candido Holanda Pereira, Marilia Mattar de Amoêdo Campos Velo, and Tatiana Rita de Lima Nascimento. "Graphene Oxide Applications in Dentistry: Integrative Literature Review." Journal of Health Sciences 21, no. 4 (December 20, 2019): 376. http://dx.doi.org/10.17921/2447-8938.2019v21n4p376-81.

Full text

Abstract:

AbstractGraphene and its derivatives, such as graphene oxide, represent the greatest potential materials in terms of biomaterials due to their excellent physical-chemical and biological properties. Thus, the present study has developed an integrative literature review in order to evaluate the capacity of graphene oxide to replace metal biomaterials currently used in Dentistry. For this purpose, LILACS, SciELO and PubMED databases were evaluated, with the following descriptors: graphene, biomaterials and Odontology, adapted for each database used. Firstly, the descriptors were searched separately and, later, the Boolean operator AND was used to define a search strategy. The articles were selected according to the following inclusion criteria: articles in Portuguese, English and Spanish, published and indexed in the databases, in the last ten years, with texts available in full and regarding the topic under study. A total of 14 scientific papers were found and 10 of them were selected for this review. After the critical reading of each article, it was possible to observe that graphene and its derivates present great biocompatibility, excellent mechanical, electrical and thermic properties, high flexibility, low density and a huge potential to be explored in health science. It is also important to highlight its potential application as a coating of metal biomaterials. Keywords: Biocompatible Materials. Materials Testing. Dentistry. ResumoO grafeno e seus derivados, como o óxido de grafeno, representam atualmente o maior potencial em termos de biomateriais, devido às suas excelentes propriedades físico-químicas e de biocompatibilidade. Assim, o presente estudo teve como premissa conduzir uma revisão integrativa da literatura de modo a verificar a capacidade do óxido de grafeno em substituir os biomateriais metálicos atualmente utilizados na Odontologia. Para isto, foram utilizadas as bases de dados Lilacs, SciELO e Pubmed, com os seguintes descritores: grafeno, biomateriais e Odontologia, adaptados para cada base de dados utilizada. Primeiramente, os descritores foram pesquisados isoladamente e, posteriormente, o operador booleano AND foi utilizado de modo a definir uma estratégia de busca. Os artigos foram selecionados de acordo com os critérios de inclusão: artigos em Português, Inglês e Espanhol, publicados e indexados nas referidas bases de dados, nos últimos dez anos, com texto disponível na íntegra e que retratassem a temática em estudo. Foram encontrados um total de 14 artigos científicos e, dez destes artigos foram selecionados para compor a revisão. A partir da leitura crítica de cada artigo, foi possível observar que o grafeno e seus derivados apresentam uma alta biocompatibilidade, notáveis propriedades mecânicas, elétricas e térmicas, alta flexibilidade, baixa densidade de massa e um enorme potencial a ser explorado para beneficiar a área da saúde. Deve-se, também, destacar sua potencial aplicação como revestimento de materiais metálicos implantáveis. Palavras-chave: Materiais Biocompatíveis. Teste de Materiais. Odontologia.

APA, Harvard, Vancouver, ISO, and other styles

3

Syaifuddin, Muhammad. "Organic Geochemical Characteristic Of Crude Oils From Orange Graben, South Sumatra Basin." Journal of Geoscience, Engineering, Environment, and Technology 1, no. 1 (December 1, 2016): 25. http://dx.doi.org/10.24273/jgeet.2016.11.3.

Full text

Abstract:

Lemat Formation in the Orange Graben in the South Sumatra basin has been considered as syn-rift sediments consist of fluvio-lacustrine sediments, create source rock with fluvio-lacustrine characterize. Based on existing publications, showing that the oils from Orange Graben have fluvio-deltaic characterization and generated by source rock from Talangakar Formation with fluvio-deltaic depositional environment. This paper emphasizes geochemistry methods. Source rock analysis, consist of 26 samples for carbon isotope and 14 samples for biomarker, while oil analysis, consist of 15 samples for carbon isotope and 19 samples for biomarker. Characterization has been based on qualitative and quantitative data. Qualitative data comprise evaluation based on chromatograms and mass-fragmentograms, whereas quantitative data consists of a series of cross-plots, eg. cross plot of carbon isotope δ13C saturates - aromatics, distribution of C27-C28-C29 sterane, Pr/nC17-Ph/nC18, Pr/Ph-Pr/nC17, carbon isotope δ13C saturates-Pr/Ph, Pr/Ph-total hopane/total sterane, and ratio of C26/C25 (tricyclic). Based on geochemical result of analysis, source rocks of Lemat Formation in the Orange Graben interpret as source rock with fluvio-deltaic characterize, have terrestrial influence while Talangakar Formation in the Orange Graben interpreted as source rock with deltaic characterization, having marine and terrestrial influence. Both of them , consist of humic kerogen. Whereas, oil samples in the Orange Graben interpreted as oilwhich is generated by source rock with fluvio-deltaic characterization, having terrestrial influence, in anoxic-suboxic-oxic conditions, consisting of humic kerogen. Correlation result between source rocks and oils in the Orange Graben, indicating that fluvio-deltaic oil type in the Orange Graben are correlate with not only the source rocks of Talangakar Formations but also with source rock of Lemat Formation.

APA, Harvard, Vancouver, ISO, and other styles

4

C. Dias, Gabriel, Thelma S.P. Cellet, Mirian C. Santos, Cláudio L. Carvalho, and Luiz F. Malmonge. "A CARACTERIZAÇÃO MORFOLÓGICA DE ÓXIDO DE GRAFENO PREPARADOS PELO MÉTODO DE HUMMERS MODIFICADO." Revista Tecnológica 29, no. 1 (January 16, 2020): 199–216. http://dx.doi.org/10.4025/revtecnol.v29i1.51286.

Full text

Abstract:

O desenvolvimento de metodologias para obtenção do oxido de grafeno a partir do grafite tem movimentando ainda boa parte das pesquisas., justamente pelos materiais em nanoescala possuírem grande potencial para aplicações como adsorventes no tratamento de efluentes contaminados com contaminantes emergentes, sendo está uma preocupação atual. Neste trabalho apresenta-se a síntese modificada via método Hummers de óxido de grafeno a partir do grafite em pó obtido comercialmente. A caracterização morfológica do material preparado ocorreu por meio da Difração de Raios X, FTIR e Espectrometria RAMAN, além de Microscopia Eletrônica de Varredura e de Transmissão. Os resultados evidenciam a formação de um nanomaterial com alto grau de oxidação e esfoliação, validando a rota de síntese utilizada evidenciando característica morfológicas do material como esperado na literatura.

APA, Harvard, Vancouver, ISO, and other styles

5

Kumar, Jogendra, and Rajesh Verma. "Experimental investigations and multiple criteria optimization during milling of Graphene Oxide (GO) doped epoxy/CFRP composites using TOPSIS-AHP hybrid module." FME Transactions 48, no. 3 (2020): 628–35. http://dx.doi.org/10.5937/fme2003628k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Iniestra, M. G. "ROLE OF TRAPPED WATER IN THE MICROWAVE ASSISTED REDUCTION AND EXFOLIATION OF GRAPHENE OXIDE." Revista Mexicana de Ingeniería Química 17, no. 2 (March 26, 2018): 445–53. http://dx.doi.org/10.24275/uam/izt/dcbi/revmexingquim/2018v17n2/iniestra.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

García-Contreras, René, Héctor Guzmán-Juárez, Daniel López-Ramos, and Carlos Alvarez-Gayosso. "Biological and physico-mechanical properties of poly(methyl methacrylate) enriched with graphene oxide as a potential biomaterial." Journal of Oral Research 10, no. 2 (April 30, 2021): 1–9. http://dx.doi.org/10.17126/joralres.2021.019.

Full text

Abstract:

Objective: To determine the cytotoxicity and effects of graphene oxide (GO) on cellular proliferation of gingival-fibroblasts, pulpdental cells and human osteoblasts in culture, and to determine the physical, mechanical and biological properties of poly (methyl methacrylate) (PMMA) enriched with GO. Material and Methods: T he G O w as c haracterized with SEM. Cytotoxicity and cell proliferation were determined by the MTT bioassay. The physical-mechanical tests (flexural strength and elastic modulus) were carried out with a universal testing machine. Sorption and solubility were determined by weighing before and after drying and immersion in water. Porosity was evaluated by visual inspection. Data were analyzed with Student's t-test and Tukey's post-hoc ANOVA. Results: The GO has a heterogeneous morphology and a particle size of 66.67±64.76 μm. GO has a slight to no-cytotoxicity (>50-75% viability) at 1-30 days, and at 24 hours incubation of PMMA with GO significantly stimulates osteoblasts (45±8%, p<0.01). The physical and mechanical properties of PMMA with GO increase considerably without altering sorption, solubility and porosity. Conclusion: GO alone or with PMMA has an acceptable biocompatibility, could contribute to cell proliferation, cell regeneration and improve the physical-mechanical properties of PMMA.

APA, Harvard, Vancouver, ISO, and other styles

8

Turek, Tomasz, Beata Fryczkowska, and Lucyna Przywara. "APPLICATION OF MEMBRANES FROM POLYACRYLONITRITE DOPPED WITH GRAPHEN OXIDE IN PURIFICATION OF INDUSTRIAL WASTEWATER GENERATED DURING PROCESSING OF METALS." Inżynieria Ekologiczna 18, no. 4 (August 1, 2017): 54–64. http://dx.doi.org/10.12912/23920629/74962.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Versteegh, Gerard J. M., Alexander J. P. Houben, and Karin A. F. Zonneveld. "Better molecular preservation of organic matter in an oxic than in a sulfidic depositional environment: evidence from <i>Thalassiphora pelagica</i> (Dinoflagellata, Eocene) cysts." Biogeosciences 17, no. 13 (July 9, 2020): 3545–61. http://dx.doi.org/10.5194/bg-17-3545-2020.

Full text

Abstract:

Abstract. Anoxic sediments, as compared to oxic settings, encompass a much higher proportion of relatively labile and thus more reactive organic matter, naturally giving rise to structural changes of the organic molecules themselves, as well as cross-linking between them (e.g., through reactive sulfur species). Both processes transform the original biomolecules into geomolecules. For the oxic environment, these intermolecular and intramolecular transformations also operate, but cross-linking may be less important since the labile, reactive component is rapidly removed. As such, one may expect a structurally better preservation of the more refractory initial biomolecules in the oxic environment. To test this hypothesis, initially identical biomolecules need to be compared between different preservational environments. Here, we use the species-specific morphology of organic microfossils to assure a single initial biosynthetic product (the cysts of the fossil dinoflagellate species Thalassiphora pelagica) for comparison. We assess the macromolecular structures of cysts from the Eocene (∼40 Ma) sulfidic Rhine Graben and the oxic Kerguelen Plateau and compare them with each other and the structures of recent cysts. While between the sites the T. pelagica cysts are morphologically identical and show no signs of morphological modification, pyrolysis gas chromatography mass spectroscopy and micro Fourier transform infrared analyses show that their macromolecular characteristics are strongly different. Comparison with recent cysts shows that the cysts deposited in the sulfidic Rhine Graben show a strong additional contribution of long-chain aliphatic moieties and thus less diagenetic intermolecular cross-linking. The presence of organic sulfur identifies natural volcanization as one of the diagenetic processes. Furthermore, we observe a loss of bound oxygen and no trace of the original carbohydrate signature of the cyst wall biomacromolecule. The material deposited in the oxic sediments of the Kerguelen Plateau shows no traces of sulfurization. It shows a minor contribution of short carbon chains only and thus less diagenetic intermolecular cross-linking. Furthermore, a carbohydrate signature was still preserved evidencing a better molecular preservation of the initial biomacromolecule, supporting our initial hypothesis. This shows that excellent morphological preservation does not imply excellent chemical preservation. It also leads to the conclusion that the best preservation of molecular structure is not necessarily where most organic matter gets preserved, which, in turn, is important for understanding the nature and fate of sedimentary organic matter and its isotopic signature.

APA, Harvard, Vancouver, ISO, and other styles

10

Chagas, Dimitrius Carvalho. "VIABILIDADE TÉCNICO-ECONÔMICA DO ÓXIDO DE GRAFENO / TECHNICAL AND ECONOMIC FEASIBILITY OF GRAPHENE OXIDE." Brazilian Journal of Development 7, no. 1 (2021): 6777–92. http://dx.doi.org/10.34117/bjdv7n1-459.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Taufantri, Yudha, Irdhawati Irdhawati, and Ida Ayu Raka Astiti Asih. "Sintesis dan Karakterisasi Grafena dengan Metode Reduksi Grafit Oksida Menggunakan Pereduksi Zn." Jurnal Kimia VALENSI 2, no. 1 (May 31, 2016): 17–23. http://dx.doi.org/10.15408/jkv.v2i1.2233.

Full text

Abstract:

Graphene is a thin material, has a hexagonal two-dimentional lattice and is considered as an interesting material for adsorption process. Nowadays, graphene has been known as a potential material for diverse application, such as adsorbent. In this study graphene was synthesized from graphite. Furthermore, graphene was applied for adsorption of dichloro diphenyl trichloroethane (DDT). Graphene was synthesized by Hummer’s method using hydrothermal and reduced by Zn. The samples were characterized by Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) methods. The results of the XRD showed graphene structure in the 2θ, appeared at 23.9369 with interlayer spacing was about 3.71763 Å, compared with graphite oxide structure in the 2θ appeared at 11.2055 with interlayer spacing was about 7.89649 Å. The results of SEM analysis showed graphene has one layer with planar hexagonal structure and seems transparent whose single layer and multi layers. The graphene adsorption was analyzed by using the UV-Visible spectrophotometer. The results indicated the surface area of graphene was shown as 46.8563 m2/g. The amount of DDT adsorbed by graphene during 15 minutes was 7.5859 mg/g. This adsorption mechanism of DDT and graphene might be due to π-π and hydrogen interactions. Keywords: Adsorption, dichloro diphenyl trichloroethane (DDT), graphena. DOI: http://dx.doi.org/10.15408/jkv.v2i1.2233

APA, Harvard, Vancouver, ISO, and other styles

12

Malinowski, Marek, Agnieszka Hreniak, Agnieszka Iwan, and Ludwika Lipinska. "Study on porosity and surface area of the mixtures of graphene oxide and TiO2 modified gas diffusion electrodes for polymer fuel cells." Polimery 61, no. 07/08 (July 2016): 538–43. http://dx.doi.org/10.14314/polimery.2016.538.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Aguilar-Meza, David Ricardo, Moisés Israel Salazar-Gastélum, Sergio Pérez-Sicairos, Rosa María Félix-Navarro, and Yadira Gochi-Ponce. "Evaluation of cobalt nanoparticle deposited graphene oxide and carbon nanotube supports as supercapacitor electrodes." Revista de Ciencias Tecnológicas 2, no. 1 (February 15, 2019): 40–44. http://dx.doi.org/10.37636/recit.v214044.

Full text

Abstract:

Las nanopartículas de cobalto se depositaron en soportes de carbono, nanotubos de carbono de pared múltiple (CNT) y óxido de grafeno (GO), y se evaluaron como potenciales electrodos de supercondensadores. La estructura y la morfología de las nanopartículas de cobalto depositadas sobre los soportes de carbono se estudiaron mediante XRD, TGA y espectroscopía Raman. La voltametría cíclica se utilizó para medir la carga eléctrica del electrodo en función de los materiales y se calculó su capacitancia específica (Csp). El electrodo basado en GO mostró un Csp mayor que el electrodo CNT, lo cual se atribuye a un área de superficie mayor del soporte de carbono GO. Curiosamente, el depósito de nanopartículas de Co promovió una Csp mejorada en los soportes GO y en los CNT de pared múltiple.

APA, Harvard, Vancouver, ISO, and other styles

14

Ahmadin, Hashem, Karim Zare, Majid Monajjemi, and Ali Shamel. "MÉTODOS COMPUTACIONALES PARA LA DELAMINACIÓN DE GRAFITO UTILIZANDO SURFACTANTES ANIONICOS PARA PRODUCIR GRAFENO." Revista de Investigaciones Universidad del Quindío 31, no. 1 (November 15, 2019): 41–53. http://dx.doi.org/10.33975/riuq.vol31n1.276.

Full text

Abstract:

Today, using thermal and chemical reduction and solubility, graphene oxide is produced in large scale. Since there are various methods for producing graphene, each of which allocates properties to the produced graphene, the purpose of this research is to investigate graphite delamination using anionic surfactants and produce graphene by means of computational methods. The research method was applied in order to perform molecular dynamics analysis, first, (the minimum) force that each atom imposes to other atoms was calculated. This is the total gradient of the system’s energy according to the coordinates of the related atom. A Bayesian method was used for dynamic modeling, which, on average, uses dynamic parameters instead of their estimates. The Gaussian Process Dynamic Model (GPDM) was completely defined by a set of low-level data representations and was observed by both dynamics and modeling of GP regression (Gaussian process regression). Then, using the Gaussian software, along with empirical results or just using this software, the molecular state and reactions and their mechanisms were simulated. The results indicated that the presence of benzene, ether and carbo xyl groups in the optimal structure facilitates the entry of surfactants into the sheets and that the agent to start the separation of the graphene sheets adhered to each other by comparing the results of this study between the two surfactants, it was found that the gap to change by separation layers between the graphene plates is different for two surfactants. Besides, the difference in the polarity of the surfactants resulted in the final polarization of the surfactant and graphene system. Therefore, the difference in the polarity causes the difference in the solubility.

APA, Harvard, Vancouver, ISO, and other styles

15

Wojnicki, M., I. Mania, M. Marzec, M. Gajewska, and K. Mech. "Influence of Experimental Conditions on Deposition of Silver Nanoparticles Onto Surface of Graphene Oxide / Wpływ Warunków Eksperymentalnych Na Proces Osadzania Nanocząstek Srebra Na Powierzchni Tlenku Grafenu." Archives of Metallurgy and Materials 60, no. 4 (December 1, 2015): 2631–36. http://dx.doi.org/10.1515/amm-2015-0425.

Full text

Abstract:

Present work describes the influence of silver nanoparticles precursor form as well as the impact of graphene oxide initial concentration on deposition of the silver nanoparticles onto graphene oxide. Borane dimethylamine complex (DMAB) was used as the reducing agent. It was observed that application of silver ammonia complexes as the silver nanoparticles precursor as well as alkaline solution effect in higher quantity of deposited AgNPs in comparison to deposition process with the use of silver(I) nitrate in acidic solution.

APA, Harvard, Vancouver, ISO, and other styles

16

Ferreira Oliveira, Ana Elisa, Arnaldo César Pereira, Guilherme Braga Bettio, and César Ricardo Teixeira Tarley. "Synthesis, Studies and Structural characterization of Thermal and Hydrazine Reduction of Graphene Oxide by Raman Spectroscopy and Infrared Spectroscopy." Revista Virtual de Química 11, no. 3 (2019): 866–77. http://dx.doi.org/10.21577/1984-6835.20190060.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Ursúa Goicoechea, María. "Propiedades mecánicas de morteros de cemento con adiciones de fibras de carbono, nanotubos de carbono y grafeno = Mechanical properties of cement mortars with additions of carbon fibres, carbon nanotubes and graphene." Anales de Edificación 3, no. 3 (December 28, 2017): 12. http://dx.doi.org/10.20868/ade.2017.3674.

Full text

Abstract:

El carbono es uno de los elementos más abundantes de la naturaleza. Su particular estructura hace que pueda tener hasta cinco tipos distintos de alótropos. Durante los últimos años se han producido grandes avances en el estudio de estos materiales de carbono. Las fibras de carbono (CF), los nanotubos de carbono (CNTs) y el grafeno y óxido de grafeno (GO), en función de su estructura y su escala, presentan unas propiedades notablemente diferenciadas. Este estudio pretende comparar y determinar los efectos de estas características en matrices de cemento. Las características de estos materiales son difíciles de transmitir de forma exacta a los compuestos de cemento y hormigones, principalmente por las dificultades que presentan los nanomateriales en su dispersión. Por ello, los datos obtenidos en distintos estudios muestran resultados muy variables. Sin embargo, se ha demostrado que, para mejoras medias, los nanomateriales resultan ser más eficientes.AbstractCarbon is one of the most abundant elements of nature. Its particular structure has to have up to five different types of allotropes. During the last years there have been great advances in the study of these carbon materials. Carbon fibers (CF), carbon nanotubes (CNT) and graphene and graphene oxide (GO), depending on their structure and scale, have remarkably different properties. This study aims to compare and determine the effects of these characteristics on cement matrices. The characteristics of these materials are difficult to transmit accurately to concrete and cement compounds, mainly due to the difficulties presented by nanomaterials in their dispersion. Therefore, the data obtained in different studies, results, very variable. However, it has been shown that, for average improvements, nanomaterials are more efficient.

APA, Harvard, Vancouver, ISO, and other styles

18

Wahyuningsih, Sayekti, Ari Handono Ramelan, Mochammad Fuad, and Qonita Awliya Hanif. "Sintesis Grafena Oksida Tereduksi Terdoping Nitrogen Dan Sulfur Dari Amonium Tiosianat Sebagai Elektroda Lawan Pada Sistem Dye Sensitized Solar Cell (DSSC)." ALCHEMY Jurnal Penelitian Kimia 16, no. 1 (February 28, 2020): 126. http://dx.doi.org/10.20961/alchemy.16.1.34587.126-139.

Full text

Abstract:

<p>Pada penelitian ini telah berhasil disintesis komposit rGO-NS melalui pendopingan pada material berbasis grafena oksida tereduksi (rGO) dengan penambahan amonium thiosianat sebagai sumber dopan N dan S. Dopan N dan S pada rGO mempengaruhi struktur rGO yang ditunjukkan dengan pergeseran puncak difraktogram pada 2θ=24,97 (<em>hkl</em> 002). Spektra <em>Fourier transform infrared</em> (FTIR) material rGO-NS memberikan serapan puncak baru dari vibrasi C=N pada daerah 1501-1516 cm<sup>-1</sup> dan dari vibrasi C-N serta C-S pada daerah 1130 – 1146 cm<sup>-1</sup>. Morfologi rGO-NS berupa lembaran tipis dua Dimensional (2D) bertumpuk dengan jarak antar lapis tertentu. Pengujian <em>I-V measurement </em>menggunakan Keithley 2602A, sistem DSSC dengan material rGO-NS digunakan sebagai bahan elektroda lawan menunjukkan efisiensi terbesar mencapai 0,1268%, dengan peningkatan efisiensi sebanyak 11,32 kali apabila dibandingkan dengan Pt.</p><p><strong>Synthesis of Reduced Graphene Oxide doped with </strong><strong>Nitrogen and Sulfur </strong><strong>from Ammonium Thiocyanate as </strong><strong>a Counter</strong><strong> Electrode in Dye</strong><strong>-</strong><strong>Sensitized Solar Cell (DSSC) System</strong><strong>.</strong> In this research, the rGO-NS composite was successfully synthesized through doping on reduced graphene oxide based-materials (rGO) with the addition of ammonium thiocyanate as nitrogen (N) and sulfur (S) source. N and S dopant influence the rGO structure indicated by the peak shifting into 2θ=24.97 (hkl 002). The Fourier transform infrared (FTIR) spectrum of material rGO-NS reveals new bands which correspond to C=N vibration within 1501 – 1516 cm<sup>-1 </sup>and C–N vibration together with C–S at area between 1130-1146 cm<sup>-1</sup>. The morphology of rGO-NS shows that the material consists of many 2 Dimensional (2D) thin layers. The current and voltage (I-V) measurement using Keithley 2602A with material rGO-NS as a counter electrode on DSSC system, demonstrates that the highest efficiency is 0.1268%. This performance is 11.32 times higher compare to the DSSC system with Pt.</p>

APA, Harvard, Vancouver, ISO, and other styles

19

Rivera-Lugo, Y. Y., C. Silva-Carrillo, B. Trujillo-Navarrete, E. A. Reynoso-Soto, T. Romero-Castañón, S. W. Lin-Ho, J. C. Calva-Yañez, F. Paraguay-Delgado, and R. M. Félix-Navarro. "Cobalt and copper nanoparticles on partially reduced graphene oxide interlayer spacing carbon nanotubes or carbon black as catalysts for oxygen reduction reaction." Revista Mexicana de Ingeniería Química 20, no. 1 (May 22, 2020): 67–75. http://dx.doi.org/10.24275/rmiq/mat961.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Schmitz, Ana Paula de Oliveira, Máira Vieira, Camila de Abreu Antoniolli, Wagner da Silveira, João Pedro do Prado, Laiza Bergamasco Beltran, Luís Fernando Cusioli, and Rosângela Bergamasco. "ESTUDO DA CINÉTICA DE ADSORÇÃO DO CARVÃO ATIVADO IMPREGNADO COM ÓXIDO DE GRAFENO / STUDY OF THE ADSORPTION KINETICS OF ACTIVATED CARBON IMPREGNATED WITH GRAPHENE OXIDE." Brazilian Journal of Development 7, no. 1 (2021): 10732–43. http://dx.doi.org/10.34117/bjdv7n1-734.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Mashuri, M., Luthfiati Ningsih, M. Zainul Asrori, T. Triwikantoro, and D. Darminto. "Sintesis dan Sifat Penyerapan Gelombang Mikro Grafena Alam (reduced graphene oxide) Berbahan Dasar Arang Bambu Kuning (Bambusa Vulgaris), Ori (Bambusa Bambos Miq) dan Petung (Dendrocalamus Asper)." Jurnal Fisika dan Aplikasinya 16, no. 3 (October 16, 2020): 173. http://dx.doi.org/10.12962/j24604682.v16i3.6973.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Burisch, Mathias, Max Frenzel, Henning Seibel, Albert Gruber, Marcus Oelze, Jörg A. Pfänder, Cynthia Sanchez-Garrido, and Jens Gutzmer. "Li-Co–Ni-Mn-(REE) veins of the Western Erzgebirge, Germany—a potential source of battery raw materials." Mineralium Deposita 56, no. 6 (June 25, 2021): 1223–38. http://dx.doi.org/10.1007/s00126-021-01061-4.

Full text

Abstract:

AbstractSituated in the western Erzgebirge metallogenetic province (Vogtland, Germany), the Eichigt prospect is associated with several quartz-Mn-Fe-oxyhydroxide veins that are exposed at surface. Bulk-rock geochemical assays of vein material yield high concentrations of Li (0.6–4.1 kg/t), Co (0.6–14.7 kg/t), and Ni (0.2–2.8 kg/t), as well as significant quantities of Mn, Cu, and light rare earth elements, a very unusual metal tenor closely resembling the mixture of raw materials needed for Li-ion battery production. This study reports on the results of a first detailed investigation of this rather unique polymetallic mineralization style, including detailed petrographic and mineralogical studies complemented by bulk rock geochemistry, electron microprobe analyses, and laser ablation inductively coupled mass spectrometry. The mineralized material comprises an oxide assemblage of goethite hematite, hollandite, and lithiophorite that together cement angular fragments of vein quartz. Lithiophorite is the predominant host of Li (3.6–11.1 kg/t), Co (2.5–54.5 kg/t), and Ni (0.2–8.9 kg/t); Cu is contained in similar amounts in hollandite and lithiophorite whereas light rare earth elements (LREE) are mainly hosted in microcrystalline rhabdophane and florencite, which are finely intergrown with the Mn-Fe-oxyhydroxides. 40Ar/39Ar ages (~ 40–34 Ma) of coronadite group minerals coincide with tectonic activity related to the Cenozoic Eger Graben rifting. A low-temperature hydrothermal overprint of pre-existing base metal sulfide-quartz mineralization on fault structures that were reactivated during continental rifting is proposed as the most likely origin of the polymetallic oxyhydroxide mineralization at Eichigt. However, tectonically enhanced deep-reaching fracture-controlled supergene weathering cannot be completely ruled out as the origin of the mineralization.

APA, Harvard, Vancouver, ISO, and other styles

23

Foltyn, M., M. Lichovníková, V. Rada, and A. Musilová. "Apparent ileal amino acids digestibility of diets with graded levels of corn DDGS and determination of DDGS amino acids digestibility by difference and regression methods in broilers." Czech Journal of Animal Science 59, No. 4 (April 15, 2014): 164–69. http://dx.doi.org/10.17221/7340-cjas.

Full text

Abstract:

This study was conducted to determine apparent ileal amino acids digestibility (AIAAD) of diets with different levels of corn distiller’s dried grains with solubles (DDGS) and to determine AIAAD of corn DDGS by difference and regression methods in broiler chickens. One hundred and fifty 30-day-old male broiler chickens were used in the experiment. The corn DDGS were incorporated into basal diets at graded levels (0, 4, 8, 12, and 16%). All birds were killed at the age of 35 days and the contents of the lower half of the ileum were collected. AIAAD was calculated using chromic oxide as the indigestible marker. For AIAAD of DDGS determination, difference and regression methods were used. AIAAD of Lys (78.6%) and Met (91.3%) were the significantly highest in the diet without DDGS in comparison with other diets (P < 0.01). AIAAD of the rest of essential and nonessential amino acids were the lowest in the diet with 8% of DDGS in comparison with the diets with 0 or 16% of DDGS (P < 0.01). The apparent ileal crude protein digestibility was also the lowest in the diet with 8% (61.8%) of DDGS (P < 0.01). The highest differences in AIAAD of DDGS determined by the difference method and in the diet without DDGS (basal diet) determined by the regression methods were found in Lys and Met. There were very low differences between DDGS and basal diet in AIAAD of nonessential amino acids, except Ala and Asp. These results show that higher levels of DDGS decrease AIAAD.  

APA, Harvard, Vancouver, ISO, and other styles

24

Ruivo, Carlos César González Piccoli. "DESENVOLVIMENTO DE ARGAMASSA PARA REPARO DE ESTRUTURAS NA CONSTRUÇÃO CIVIL UTILIZANDO ÓXIDO DE GRAFENO COMO ADITIVO / MORTAR DEVELOPMENT FOR REPAIR OF STRUCTURES IN CIVIL CONSTRUCTION USING GRAPHEN OXIDE AS AN ADDITIVE." Brazilian Journal of Development 7, no. 1 (2021): 8082–100. http://dx.doi.org/10.34117/bjdv7n1-549.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Cambraia, Luciana Vasconcelos, Felipe Luiz Queiroz Ferreira, Matheus Regino Faria Bernardes, and Glaura Goulart Silva. "DESENVOLVIMENTO DE FILAMENTOS DE PLA E ÓXIDO DE GRAFENO PARA MELHORIA TERMOMECÂNICA DE PEÇAS PRODUZIDOS POR IMPRESSÃO 3D / DEVELOPMENT OF PLA AND GRAPHENE OXIDE FILAMENTS FOR THERMO-MECHANICAL IMPROVEMENT OF PARTS PRODUCED BY 3D PRINTING." Brazilian Journal of Development 6, no. 9 (2020): 69623–36. http://dx.doi.org/10.34117/bjdv6n9-419.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Oliveira, Francilio de Carvalho, Manuel Henrique de Sousa Cunha, Mariana Carneiro Brito, Vinicius Luis de Oliveira Cantuário, Jancineide Oliveira de Carvalho, and Anderson Oliveira Lobo. "ESTUDO IN VIVO DA TOXICIDADE E CITOTOXICIDADE DE BIOCERÂMICOS DE NANOHIDROXIAPATITA E NANOTUBOS DE CARBORNOS FUNCIONALIZADO COM ÓXIDO DE GRAFENO / IN VIVO STUDY OF THE TOXICITY AND CYTOTOXICITY OF NANO-HYDROXYAPATITE AND CARBIDE NANOTUBES FUNCTIONALIZED WITH GRAPHENE OXIDE." Brazilian Journal of Development 6, no. 10 (2020): 78341–52. http://dx.doi.org/10.34117/bjdv6n10-312.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Dias, Luana Inêz Ribeiro, Elizabeth das Chagas Ramos, and Odila Florencio. "APROVEITAMENTO DE RESÍDUOS DA CONSTRUÇÃO E DEMOLIÇÃO (RCD) NA FABRICAÇÃO DE BLOCOS DE CONCRETO SEM E COM ADIÇÃO DE ÓXIDO DE GRAFENO/ USE OF CONSTRUCTION AND DEMOLITION WASTE (RCD) IN THE MANUFACTURE OF CONCRETE BLOCKS WITHOUT AND WITH THE ADDITION OF GRAPHENE OXIDE." Brazilian Journal of Development 7, no. 1 (2021): 5972–89. http://dx.doi.org/10.34117/bjdv7n1-407.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Robles, Juvencio, and Brenda Manzanilla. "Conceptual DFT Reactivity Descriptors Computational Study of Graphene and Derivatives Flakes: Doped Graphene, Graphane, Fluorographene, Graphene Oxide, Graphyne, and Graphdiyne." Journal of the Mexican Chemical Society 64, no. 3 (July 9, 2020). http://dx.doi.org/10.29356/jmcs.v64i3.1167.

Full text

Abstract:

Abstract. Allotropes of carbon such as graphene, graphane, fluorographene, doped graphene with N, B or P, graphene oxide, graphyne, and graphdiyne were studied through conceptual DFT reactivity descriptor indexes. To understand their chemical behavior and how they interact with different types of molecules, for instance, drugs (due to their potential use in drug carrier applications). This work shows the results of the changes in the global and local reactivity descriptor indexes and geometrical characteristics within the different graphene derivatives and rationalizes how they can interact with small molecules. Molecular hardness, the ionization energy, the electron affinity, electrodonating power index, and electroaccepting power indexes are the computed global reactivity descriptors. While, fukui functions, local softness, and molecular electrostatic potential are the local reactivity descriptors. The results suggest that the hybridization of carbons in the derivatives is kept close to sp3, while for graphene is sp2, the symmetry changes have as consequence changes in their chemical behavior. We found that doping with B or P (one or two atoms doped) and functionalizing with -OH or -COOH groups (as in graphene oxide), decreases the ionization energy in water solvent calculations, allowing for easier electron donation. On the other hand, doping with N atoms and functionalizing with F atoms increases the electron affinity. These types of changes enhance the chemisorption or physisorption by non-covalent interactions and covalent interactions with small molecules, principally, in the carbon atoms nearest to the doped/functionalized atom. Resumen. Los alótropos de carbono como el grafeno, el grafano, el fluorografeno, el grafeno dopado con N, B o P, el óxido de grafeno, el grafino y el grafidiino se estudiaron mediante los índices de los descriptores de reactividad de la DFT conceptual. Ello, para comprender su comportamiento químico y cómo interactúan con diferentes tipos de moléculas, por ejemplo, fármacos (debido a su posible uso en aplicaciones como transportadores de fármacos). Este trabajo muestra los resultados de los cambios en los índices de los descriptores de reactividad global y local y las características geométricas de los diferentes derivados de grafeno y, predice cómo podrián interactuar con moléculas pequeñas. La dureza molecular, la energía de ionización, la afinidad electrónica, el índice de potencia electrodonadora y electroaceptora son los descriptores DFT de reactividad global calculados. Mientras que las funciones de fukui, la suavidad local y el potencial electrostático molecular son los descriptores de reactividad local. Los resultados sugieren que la hibridación de los carbonos en los derivados se mantiene cerca de sp3, mientras que para el grafeno es sp2, los cambios de simetría tienen como consecuencia cambios en su comportamiento químico. Descubrimos que el dopaje con B o P (uno o dos átomos dopados) y la funcionalización con grupos -OH o -COOH (como en el óxido de grafeno), disminuye la energía de ionización en los cálculos de solvente con agua, lo que permite una donación de electrones más fácil. Por otro lado, el dopaje con átomos de N y la funcionalización con átomos de F aumenta la afinidad electrónica. Estos tipos de cambios mejoran la quimisorción o fisisorción por interacciones no covalentes e interacciones covalentes con moléculas pequeñas, principalmente en los átomos de carbono más cercanos al átomo dopado/funcionalizado.

APA, Harvard, Vancouver, ISO, and other styles

29

Kartal Temel, Nuket, Kadriye Sertakan, and Ümit Nazlı Temel. "Improvement of Affecting Parameters to Synthesis Grafene Oxide by Hummer Method)." Cumhuriyet Science Journal, December 8, 2017, 674–80. http://dx.doi.org/10.17776/csj.356379.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

WIDADA, HARI, ABDUL ROHMAN, RIRIS ISTIGHFARI JENIE, and SISMINDARI . "APPLICATION OF GRAPHENE OXIDE ON APTAMER-BASED BIOSENSOR DEVELOPMENT FOR AUTHENTICATION OF GELATIN." International Journal of Applied Pharmaceutics, January 30, 2019, 254–58. http://dx.doi.org/10.22159/ijap.2019v11i2.31122.

Full text

Abstract:

Objective: The objective of this study was to perform aptamer selection using systematic evolution of ligands by exponential enrichment (SELEX) method which assisted by graphene oxide against target of porcine gelatin (non-halal gelatin). Methods: The aptamer selection was carried out using SELEX method without target immobilization. Selection of aptamer capable of binding porcine gelatin by applying grafen oxide (GO) was known as GO-SELEX. The selection process was initially carried out by incubation of single-stranded DNA (ssDNA) libraries targeting on porcine gelatin with the addition of graphene oxide. The selected ssDNA was then purified by several stages namely; symmetric PCR amplification, purification of products with DNA purification kits, asymmetric PCR amplification, and continued purification of DNA with native PAGE. The analysis of each stage was done by agarose gel electrophoresis. Results: the results showed that aptamer targeting porcine DNA could be selected. This was indicated by the results of DNA analysis using native polyacrylamide gel electrophoresis (PAGE) in which sharp separation band with a base length equivalent to the marker of the ssDNA library (about 80 base pair) was obtained. Conclusion: Aptamer targeting on porcine gelatin has been successfully developed using GO-SELEX method. GO can increase selectivity in developing aptamer which will be used as a biosensor to detect porcine gelatin. The method could be proposed as a standard of apatamer based method for porcine gelatin detection on halal products authentication.

APA, Harvard, Vancouver, ISO, and other styles

31

"Efecto morfológico y térmico de filmes flexibles de etilen vinil alcohol reforzados con óxido de grafeno." Revista ECIPeru, December 15, 2018, 110–14. http://dx.doi.org/10.33017/reveciperu2015.0017/.

Full text

Abstract:

Efecto morfológico y térmico de filmes flexibles de etilen vinil alcohol reforzados con óxido de grafeno Morphological and thermal effects of ethylene vinyl alcohol film reinforced with graphene oxide Lourdes Marcela Yataco-Lazaro1, Jesús González-Ruiz2,3, Sueli Virginio4, Rene R. Oliveira4, Wilson S. Maia5, Francisco Valenzuela-Díaz5, Esperidiana Moura4, 1 University of São Paulo, Faculty of Pharmaceutical Sciences, Av. Professor Lineu Prestes, 580, São Paulo, PA 05508-00, Brazil 2 Biomaterials Center, University of Havana, Av. Universidad / G y Ronda, PA 10400, Havana, Cuba 3 High Polytechnic Institute “José Antonio Echeverría”, Street 114 / 119 and 127, PA 10800, Havana, Cuba 3 Nuclear and Energy Research Institute – IPEN-CNEN/SP Av. L. Prestes, 2242 São Paulo, PA 05508000, Brazil 4 Metallurgical and Materials Engineering Department, Polytechnic School, University of São Paulo, Av. Mello de Moraes, 2463, São Paulo, PA 05508-030, Brazil DOI: https://doi.org/10.33017/RevECIPeru2015.0017/ Resumen Se estudió los efectos morfológicos y térmicos de los filmes de EVOH reforzados con 0.1 y 0.5 wt. % de GO. El EVOH ha sido ampliamente usado en embalajes para alimentos porque preserva la calidad de los productos debido a su excelente desempeño de barrera de gas y su buena transparencia. El GO fue preparado vía oxidación química del grafito y fue exfoliado en nanoláminas usando el método sonoquímico. Los filmes fueron preparados por extrusión en estado fundido y extrusión por soplado, luego fueron caracterizados por análisis de XRD, TG y SEM, la correlación entre sus propiedades fue discutida. Descriptores: etilen vinil alcohol, óxido de grafeno, filmes flexibles, propiedades mecánicas, propiedades térmicas. Abstract This work studied the morphological and thermal effects of ethylene vinyl alcohol (EVOH) film reinforced with 0.1 and 0.5 wt. % of graphene oxide (GO). The EVOH has been widely used in packaging for food to preserve the quality of the products due to its excellent gas barrier performance and its good transparency. The GO was prepared via chemical oxidation of graphite and was exfoliated into nanosheets using the sonochemical method. The films were prepared by melt and blown extrusion, then were characterized by XRD, TG and SEM analysis, the correlation between properties was discussed. Keywords: ethylene vinyl alcohol, graphene oxide, flexible films, mechanical properties, thermal properties.

APA, Harvard, Vancouver, ISO, and other styles

32

Figueredo, Igor Carneiro, and Antonio Riul Junior. "Nanoestruturação de nanofolhas de óxido de grafeno reduzido com glicose oxidase (GOx) para verificar transferência direta de elétrons." Revista dos Trabalhos de Iniciação Científica da UNICAMP, no. 26 (January 14, 2019). http://dx.doi.org/10.20396/revpibic262018609.

Full text

Abstract:

A nanoestruturação de materiais possibilita explorar propriedades únicas não observadas em macroescala, e uma técnica bastante explorada é a de automontagem por adsorção física (LbL ,do inglês Layer by Layer). Neste trabalho fizemos filmes LbL de óxido de reduzido (rGO, do inglês reduced graphene oxide) funcionalizado com polialilamanina hidroclorada (PAH) e poliestirenossulfonado (PSS), que denominaremos respectivamente de GPAH e GPSS. A ideia inicial era a nanoestruturação de filmes (GPAH/GPSS) com a enzima glicose oxidase, seguido da caracterização eletroquímica dos filmes formados.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!