scholarly journals Graphene synthesis by hydrazine and reduced thermal expansion graphite oxide and application in the preparation of nano-composite PMMA/graphene

2016 ◽  
Vol 19 (4) ◽  
pp. 214-226
Author(s):  
Vy Tuong Nguyen ◽  
Trung Lap Huynh ◽  
Tam Thanh Mai ◽  
Huy Thuc Ha
Keyword(s):  
Graphene Oxide ◽  
Decomposition Temperature ◽  
Nanocomposite Materials ◽  
Pure Pmma ◽  
Nano Composite ◽  
Structure And Morphology ◽  
Exfoliated Graphene ◽  
Graphene Synthesis ◽  
Graphene Nanocomposite

By in situ emulsion method to prepare polymethyl metaacrylate (PMMA) and graphene nanocomposite materials showed remarkable properties: the in glass transition temperature was increased from 5-80 0C, the decomposition temperature was 50 0C higher, the stiffness is 46 % higher compared to the pure PMMA. The reduction of exfoliated graphene oxide in TGO-PMMA nanocomposite after synthesis by hydrazine is more effective than the reduction of graphene oxide into graphene and then synthesizing the nanocomposite with PMMA. There are some differences in the structure and morphology of two nanocomposite samples (SEM and TEM) synthesized by these two methods, leading differences in their properties, as well as the original pure PMMA. These results open up new potential for the application of graphene and resulted nanocomposites.

Analysis of the low-temperature restoration process of graphene oxide based on in situ conductivity measurement

2019 ◽  
Vol 7 (9) ◽  
pp. 2583-2588 ◽  
Author(s):  
Takuya Shinohara ◽  
Seiji Obata ◽  
Koichiro Saiki
Keyword(s):  
Graphene Oxide ◽  
Low Temperature ◽  
High Throughput ◽  
Synthesis Method ◽  
Conductivity Measurement ◽  
Industrial Applications ◽  
Restoration Process ◽  
Graphene Synthesis ◽  
Honeycomb Network

Graphene, a honeycomb network of sp2 carbon atoms, is expected to replace conventional materials in various fields, which makes it important to develop a high-throughput graphene synthesis method for industrial applications.

A polyaniline/graphene nanocomposite prepared by in situ polymerization of polyaniline onto polyanion grafted graphene and its electrochemical properties

RSC Advances ◽  
2014 ◽  
Vol 4 (15) ◽  
pp. 7673-7681 ◽  
Author(s):  
Tao Wu ◽  
Xiaoyang Xu ◽  
Lei Zhang ◽  
Huabin Chen ◽  
Jianping Gao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Properties ◽  
Hydrazine Hydrate ◽  
Reduced Graphene Oxide ◽  
Radical Polymerization ◽  
In Situ Polymerization ◽  
Reduced Graphene ◽  
Graphene Nanocomposite

Poly(sodium 4-styrensulfonate), a polyanion, was grafted onto reduced graphene oxide (RGO-g-PSSNa) by in situ radical polymerization and was then chemically reduced with hydrazine hydrate.

scholarly journals Antibacterial Performance of a Mussel-Inspired Polydopamine-Treated Ag/Graphene Nanocomposite Material

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3360
Author(s):  
Jianming Liao ◽  
Shuaiming He ◽  
Shasha Guo ◽  
Pengcheng Luan ◽  
Lihuan Mo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Antibacterial Properties ◽  
Great Promise ◽  
X Ray ◽  
Antibacterial Performance ◽  
Reduced Graphene ◽  
Wide Range ◽  
Graphene Nanocomposite

Graphene-based nanocomposites have attracted tremendous attention in recent years. In this study, a facile yet effective approach was developed to synthesize reduced graphene oxide and an Ag–graphene nanocomposite. The basic strategy involved in the preparation of reduced graphene oxide includes reducing graphene oxide with dopamine, followed by in situ syntheses of the Ag-PDA-reducing graphene oxide (RGO) nanocomposite through adding AgNO3 solution and a small amount of dopamine. The nanocomposite was characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), FTIR spectra, Raman spectra, ultraviolet-visible (UV-vis), and X-ray photoelectron spectroscopy (XPS), results indicated that a uniform PDA film is formed on the surface of the GO and GO is successfully reduced. Besides, the in situ synthesized Ag nanoparticles (AgNPs) were evenly distributed on the RGO surface. To investigate antibacterial properties Ag-PDA-RGO, different dosages were selected for evaluating the antibacterial activity against Gram-positive bacteria Staphylococcus aureus and Gram-negative bacteria Escherichia coli. The Ag-PDA-RGO nanocomposites displayed excellent antibacterial property. The antibacterial ratio reached 99.9% against S. aureus and 90.9% against E. coli when the dosage of 100 mg/L Ag-PDA-RGO nanocomposites was 100 μL. The novel Ag-PDA-RGO nanocomposite prepared by a facile yet effective, environmentally friendly, and low-cost method holds great promise in a wide range of modern biomedical applications.

High Electrochemical Performance of LiFePO4 Cathode Material via In-Situ Microwave Exfoliated Graphene Oxide

2015 ◽  
Vol 151 ◽  
pp. 240-248 ◽  
Author(s):  
Feng Yu ◽  
Lili Zhang ◽  
Linfei Lai ◽  
Mingyuan Zhu ◽  
Yanchuan Guo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Exfoliated Graphene ◽  
Lifepo4 Cathode

scholarly journals The Role of Reduced Graphene Oxide in the Suspension Polymerization of Styrene and Its Effect on the Morphology and Thermal Properties of the Polystyrene/rGO Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1468
Author(s):  
Marta Sieradzka ◽  
Janusz Fabia ◽  
Dorota Biniaś ◽  
Ryszard Fryczkowski ◽  
Jarosław Janicki
Keyword(s):  
Graphene Oxide ◽  
Thermal Properties ◽  
Reduced Graphene Oxide ◽  
Suspension Polymerization ◽  
Decomposition Temperature ◽  
Reduced Graphene ◽  
The Difference ◽  
Polar Functional Groups

Reduced graphene oxide (rGO) was used to obtain Polystyrene (PS)/rGO nanocomposites via in-situ suspension polymerization. The main goal of the article was to determine how rGO influences the morphology and thermal properties of PS beads. The obtained samples were studied by means of a scanning electron microscope (SEM), and calorimetric and thermogravimetric analysis (DCS, TGA). It was proven that the addition of rGO, due to the presence of polar functional groups, causes significant changes in bead sizes and size distribution, and in their morphology (on the surface and in cross-section). The increasing amount of rGO in the polymer matrix increased the size of beads from 0.36 to 3.17 mm for pure PS and PS with 0.2 wt% rGO content, respectively. PS/rGO nanocomposites are characterized by distinctly improved thermostability, which is primarily expressed in the increase in their decomposition temperature. For a sample containing 0.3 wt% rGO, the difference is more than 12 °C in comparison to pure PS beads.

In-situ Modification of Graphene Oxide by Insoluble Sulfur and Application for Nitrile Butadiene Rubber

2020 ◽  
Vol 35 (2) ◽  
pp. 221-228
Author(s):  
S.-B. Chen ◽  
T.-X. Li ◽  
S.-H. Wan ◽  
X. Huang ◽  
S.-W. Cai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
In Situ Modification

In situ synthesis of Mn3O4/graphene nanocomposite and its application as a lubrication additive at high temperatures

2021 ◽  
Vol 546 ◽  
pp. 149019
Author(s):  
Bao Jin ◽  
Jun Zhao ◽  
Guangyan Chen ◽  
Yongyong He ◽  
Yiyao Huang ◽  
...  
Keyword(s):  
High Temperatures ◽  
In Situ Synthesis ◽  
Graphene Nanocomposite ◽  
Lubrication Additive
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