scholarly journals Preparation and Performance of Ecofriendly Epoxy/Multilayer Graphene Oxide Composites with Flame-Retardant Functional Groups

2018 ◽  
Vol 2 (2) ◽  
pp. 18 ◽  
Author(s):  
Ming-He Chen ◽  
Cing-Yu Ke ◽  
Chin-Lung Chiang
Keyword(s):  
Graphene Oxide ◽  
Flame Retardant ◽  
Functional Groups ◽  
Multilayer Graphene ◽  
And Performance ◽  
Oxide Composites

scholarly journals Room temperature production of graphene oxide with thermally labile oxygen functional groups for improved lithium ion battery fabrication and performance

2019 ◽  
Vol 7 (16) ◽  
pp. 9646-9655 ◽  
Author(s):  
Jiadong Qin ◽  
Yubai Zhang ◽  
Sean E. Lowe ◽  
Lixue Jiang ◽  
Han Yeu Ling ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Battery ◽  
Functional Groups ◽  
Room Temperature ◽  
Synthesis Method ◽  
Lithium Ion ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis ◽  
Oxygen Functional Groups ◽  
And Performance

We report a room-temperature synthesis method to produce graphene oxide with thermally-labile oxygen functional groups.

Ultrafast H2-Selective Nanoporous Multilayer Graphene Membrane Prepared by Confined Thermal Annealing

2021 ◽  
Author(s):  
Jeong Pil Kim ◽  
Eunji Choi ◽  
Junhyeok Kang ◽  
Seung Eun Choi ◽  
Yunkyu Choi ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
High Pressure ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Thermal Annealing ◽  
Multilayer Graphene ◽  
Graphene Membrane ◽  
Oxygen Functional Groups ◽  
Co2 Selectivity

H2 selective dense pores are generated in graphene oxide (GO) layer by thermal-decomposition of oxygen-functional groups under high pressure. The nanoporous GO membrane shows H2/CO2 selectivity of 12.1 and H2...

scholarly journals Catalase-like properties of multilayer graphene oxides and their modified forms

Surface ◽  
2020 ◽  
Vol 12(27) ◽  
pp. 251-262
Author(s):  
K. V. Voitko ◽  
◽  
O. M. Bakalinska ◽  
Yu. V. Goshovska ◽  
Yu. I. Sementsov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Catalytic Reaction ◽  
Active Sites ◽  
Aqueous Media ◽  
Reaction Medium ◽  
Multilayer Graphene ◽  
Graphene Oxides ◽  
Modified Forms

The catalytic system, that mimets catalase enzyme such as “multilayer graphene oxide /peroxide molecule” in aqueous media was investigated. The main factors that influence on catalyst’s effectiveness were determining. The catalytic activity of as-synthesized multilayered graphene oxides, and their modified forms (oxidized and nitrogen doped) were investigated in the decomposition of hydrogen peroxides at room temperature and physiological pHs by measuring the volume of released gases. A phosphate buffer with a pH of 5 to 8 was chosen as the reaction medium. The original and modified samples were characterized using XPS, TPD-MS, Boehm titration analyses. The effect of surface chemistry on the catalytic reaction proceeding has been studied. It was found that catalysis on the graphene plane is determined by the presence of heteroatoms in their structure. The catalytic process takes place in the kinetic zone over the entire accessible surface of the samples. The active sites of the catalysts contain a large amount of both nitrogen and oxygen-containing functional groups. In addition, the surface of graphene oxide is hydrophilic, which enhances the catalytic reaction in an aqueous medium. It has been established that the rate of hydrogen peroxide decomposition by reduced graphene oxide samples is lower than for samples modified with oxygen and nitrogen. The catalase-like activity of graphene increases in alkaline pH up to 7.8. Studies have shown that samples of multilayer graphenes with a high content of functional groups can be an alternative to the catalase enzyme as a catalyst for the decomposition of hydrogen peroxide in physiological solutions.

Novel Magnetic Nanocluster@Graphene Oxide Composites for Potential Application in Environmental Adsorption

2020 ◽  
Vol 20 (3) ◽  
pp. 1814-1821 ◽  
Author(s):  
Zhongliang Hu ◽  
Xiaojing Zhang ◽  
Houquan Cui ◽  
Zhaohui Li
Keyword(s):  
Graphene Oxide ◽  
Magnetic Particle ◽  
Performance Enhancement ◽  
Rough Surfaces ◽  
Sio2 Coating ◽  
Characterization Methods ◽  
Good Magnetic Property ◽  
And Performance ◽  
Oxide Composites ◽  
Potential Use

Graphene-oxide-wrapped magnetic Fe3O4 nanocluster (NC) composites (MC@GO) were prepared and their characteristics were analyzed by multiple characterization methods. Results indicated that the magnetic NCs (~400 nm in size) were composed of numerous Fe3O4 monocrystalline particles (30–50 nm in size) and MC@GO had stable structure, high saturation magnetization (61 emu/g) and specific surface area of 112.5 m2/g. The magnetic NCs were integrally and tightly encapsulated in the composites by silk-like GO sheets via electrostatic interaction. The formation mechanism for MC@GO is also discussed in detail herein. Fe3+ was reduced by ethylene glycol in the adopted synthesis scheme, to generate Fe3O4 monocrystalline particles that aggregated to form Fe3O4 NCs with rough surfaces. Subsequent SiO2 coating and positive charge introduction caused the GO sheets to firmly wrap around the magnetic NCs, resulting in novel GO wrapped magnetic NC composites. The Fe3O4 NCs contributed much to structure amelioration and performance enhancement of the final GO composites. The rough surfaces of Fe3O4 NCs were beneficial for the SiO2 coating and final wrapping of GO sheets. The good magnetic property and beneficial structure of MC@GO make it an ideal adsorbent, which was demonstrated in the current study using methylene blue (MB) as a model adsorbate. The maximum MB adsorption capacity for MC@GO reached 105.5 mg/g. This is the first study on GO-wrapped Fe3O4 NC composites and their potential use for environmental adsorption. Furthermore, this study provides a method for developing GO wrapped magnetic particle composites by tailoring the magnetic precursor.

Design and performance of Fe3O4@SiO2/MoO3/polydopamine-graphene oxide composites for visible light photocatalysis

2021 ◽  
Author(s):  
Rheamay Vasallo-Antonio ◽  
Janire Peña-Bahamonde ◽  
Mariano D. Susman ◽  
Florencio C. Ballesteros ◽  
Debora F. Rodrigues
Keyword(s):  
Graphene Oxide ◽  
Visible Light ◽  
Visible Light Photocatalysis ◽  
And Performance ◽  
Oxide Composites
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