On the sign of the relaxation activation energy for interfacial polarization in reduced graphene oxide–based nano-composites

2016 ◽  
Vol 109 (18) ◽  
pp. 182901 ◽  
Author(s):  
Rakibul Islam ◽  
Anthony N. Papathanassiou ◽  
Roch Chan-Yu-King ◽  
Frédérick Roussel
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Interfacial Polarization ◽  
Nano Composites ◽  
Reduced Graphene

Synthesis and characterization of copper particles decorated reduced graphene oxide nano composites for the application of supercapacitors

2018 ◽  
Author(s):  
B. V. Naveen Kumar ◽  
Putra Kumar Balla ◽  
Satya Kamal Chirauri ◽  
T. K. Visweswara Rao ◽  
Y. Ramakrishna ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Synthesis And Characterization ◽  
Nano Composites ◽  
Copper Particles ◽  
Reduced Graphene

scholarly journals Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2528
Author(s):  
Yudong Wang ◽  
Min Yang ◽  
Honggang Chen ◽  
Xiaopeng Zhao ◽  
Jianbo Yin
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electric Fields ◽  
Flow Instability ◽  
Interfacial Polarization ◽  
Simultaneous Action ◽  
Dielectric Polarization ◽  
Polarization Rate ◽  
Reduced Graphene ◽  
The Difference

We prepared poly(ethylaniline)-coated graphene oxide nanoflakes and then treated them with different concentrations of hydrazine solution to form dielectric composite nanoflakes having different reduction degrees of reduced graphene oxide core and insulating polyethylaniline shell (PEANI/rGO). The morphology of PEANI/rGO was observed by scanning electron microscopy, while the chemical structure was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectrometer. The influence of reduction degrees on the conductivity, dielectric polarization and electrorheological effect of PEANI/rGO in suspensions was investigated by dielectric spectroscopy and rheological test under electric fields. It shows that the PEANI/rGO has two interfacial polarization processes respectively due to rGO core and PEANI shell. As the number of hydrazine increases, the conductivity and polarization rate of rGO core increase. As a result, the difference between the polarization rate of rGO core and that of the PEANI shell gradually becomes large. This increased difference does not significantly decrease the yield stress but causes the flow instability of PEANI/GO suspensions under the simultaneous action of electric and shear fields.

scholarly journals Hydrodechlorination of carbon tetrachloride with nanoscale nickeled zero-valent iron @ reduced graphene oxide: kinetics, pathway, and mechanisms

2020 ◽  
Vol 82 (4) ◽  
pp. 759-772
Author(s):  
Xiao Chen ◽  
Zhen Wang ◽  
Qi Yang ◽  
Yeyao Wang ◽  
Zhaoxiang Liu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Carbon Tetrachloride ◽  
Reduced Graphene Oxide ◽  
Bimetallic Nanoparticles ◽  
Dimensional Structure ◽  
Nickel Metal ◽  
Reduced Graphene ◽  
Supporting Material ◽  
Reaction Activation Energy

Abstract In recent years, carbon tetrachloride (CT) has been frequently detected in surface water and groundwater around the world; it is necessary to find an effective way to treat wastewater contaminated with it. In this study, Ni/Fe bimetallic nanoparticles were immobilized on reduced graphene oxide (NF@rGO), and used to dechlorinate CT in aqueous solution. Scanning electron microscopy (SEM) demonstrated that the two-dimensional structure of rGO could disperse nanoparticles commendably. The results of batch experiments showed that the 4N4F@rGO (Fe/GO = 4 wt./wt., and Ni/Fe = 4 wt.%) could reach a higher reduction capacity (143.2 mgCT/gcatalyst) compared with Ni/Fe bimetallic nanoparticles (91.7 mgCT/gcatalyst) and Fe0 nanoparticles (49.8 mgCT/gcatalyst) respectively. That benefited from the nickel metal as a co-catalyst, which could reduce the reaction activation energy of 6.59 kJ/mol, and rGO as an electrical conductivity supporting material could further reduce the reaction activation energy of 4.73 kJ/mol as presented in the conceptual model. More complete dechlorination products were generated with the use of 4N4F@rGO. Based on the above results, the reductive pathway of CT and the catalytic reaction mechanism have been discussed.

Role of Reduced Graphene Oxide on Mechanical-thermal Properties of Aluminum Metal Matrix Nano Composites

2015 ◽  
Vol 2 (4-5) ◽  
pp. 1270-1275 ◽  
Author(s):  
K. Srinivasulu Reddy ◽  
D. Sreedhar ◽  
K. Deepak Kumar ◽  
G. Praveen Kumar
Keyword(s):  
Graphene Oxide ◽  
Thermal Properties ◽  
Reduced Graphene Oxide ◽  
Metal Matrix ◽  
Nano Composites ◽  
Aluminum Metal ◽  
Reduced Graphene

Synthesis and Enhanced Electro-Magnetic Wave Absorbing Properties of Reduced Graphene Oxide-Fe3O4-Polyaniline Ternary Nano-Composites

2021 ◽  
Vol 13 (3) ◽  
pp. 473-480
Author(s):  
Yihan Jin ◽  
Xi Luo ◽  
Jinglin Zhang ◽  
Dongliang Zhao ◽  
Kewei Gao
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Nano Particles ◽  
Magnetic Data ◽  
Nano Composites ◽  
Frequency Bandwidth ◽  
Magnetic Wave ◽  
Three Samples ◽  
Reduced Graphene ◽  
Electro Magnetic

Micro-emulsion method is adopted to synthesis rGO-Fe3O4-PANI (reduced graphene oxide-Fe3O4-polyaniline) ternary nano-composites. With the different contents of aniline (0.1 g, 0.2 g, 0.3 g) added in production, the corresponding final products are named as sample 1, sample 2, sample 3, respectively. The results of TEM indicate that the mean size of Fe3O4 nano-particles is 14 nm and they are anchored onto rGO slice. There are some PANI polymer wrinkles distributed on the rGO surface uniformly. The electro-magnetic data demonstrate that sample 1 possess a great enhancement of the electro-magnetic wave absorption abilities and frequency bandwidth among the three samples. The RLmin (minimum reflection loss) value of sample 1 is -44.16 dB at 4.29 GHz with 5 mm coating thickness and 1.77 GHz (3.72-4.94 GHz, 13.33-13.88 GHz) frequency bandwidth (RL <italic/> -10 dB). We can believe that this kind of nano-composites will have a promising application in the future.

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