scholarly journals Characterization of Reduced and Surface-Modified Graphene Oxide in Poly(Ethylene-co-Butyl Acrylate) Composites for Electrical Applications

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 740 ◽  
Author(s):  
Carmen Cobo Sánchez ◽  
Martin Wåhlander ◽  
Mattias Karlsson ◽  
Diana C. Marin Quintero ◽  
Henrik Hillborg ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Butyl Acrylate ◽  
Particle Dispersion ◽  
Butyl Methacrylate ◽  
High Voltage Direct Current ◽  
Modified Graphene Oxide ◽  
Filler Fraction ◽  
Poly Ethylene ◽  
Surface Modified ◽  
Modified Graphene

Promising electrical field grading materials (FGMs) for high-voltage direct-current (HVDC) applications have been designed by dispersing reduced graphene oxide (rGO) grafted with relatively short chains of poly (n-butyl methacrylate) (PBMA) in a poly(ethylene-co-butyl acrylate) (EBA) matrix. All rGO-PBMA composites with a filler fraction above 3 vol.% exhibited a distinct non-linear resistivity with increasing electric field; and it was confirmed that the resistivity could be tailored by changing the PBMA graft length or the rGO filler fraction. A combined image analysis- and Monte-Carlo simulation strategy revealed that the addition of PBMA grafts improved the enthalpic solubility of rGO in EBA; resulting in improved particle dispersion and more controlled flake-to-flake distances. The addition of rGO and rGO-PBMAs increased the modulus of the materials up to 200% and the strain did not vary significantly as compared to that of the reference matrix for the rGO-PBMA-2 vol.% composites; indicating that the interphase between the rGO and EBA was subsequently improved. The new composites have comparable electrical properties as today’s commercial FGMs; but are lighter and less brittle due to a lower filler fraction of semi-conductive particles (3 vol.% instead of 30–40 vol.%).

Surface modified graphene oxide/poly(vinyl alcohol) composite for enhanced hydrogen gas barrier film

2016 ◽  
Vol 50 ◽  
pp. 49-56 ◽  
Author(s):  
Hongyu Liu ◽  
Parthasarathi Bandyopadhyay ◽  
Nam Hoon Kim ◽  
Bongho Moon ◽  
Joong Hee Lee
Keyword(s):  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Hydrogen Gas ◽  
Poly Vinyl Alcohol ◽  
Gas Barrier ◽  
Modified Graphene Oxide ◽  
Surface Modified ◽  
Modified Graphene ◽  
Barrier Film

Poly(ethylene imine)-modified graphene oxide with improved colloidal stability and its adsorption of methyl orange

2014 ◽  
Vol 70 (5) ◽  
pp. 851-857 ◽  
Author(s):  
Hongxi Liu ◽  
Ting Wu ◽  
Zhimin Wu ◽  
Yong Zhang ◽  
Keqin Xuan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Methyl Orange ◽  
Adsorption Capacity ◽  
Colloidal Stability ◽  
Ethylene Imine ◽  
Chemically Modified ◽  
Modified Graphene Oxide ◽  
Infrared Spectrometer ◽  
Poly Ethylene ◽  
Modified Graphene

Graphene oxide (GO) was chemically modified with poly(ethylene imine) (PEI) to improve its colloidal stability and was investigated as a potential adsorbent for the removal of methyl orange (MO). The synthesis of PEI-GO was verified with a Fourier transform infrared spectrometer and thermogravimetric analysis. A series of adsorption experiments were carried out to investigate the adsorption capacity of PEI-GO. Adsorption kinetics and thermodynamics studies were performed, and the thermodynamic parameters were calculated. The results showed that PEI could improve the colloidal stability of GO in aqueous solution, and the obtained PEI-GO showed a macroscopically homogeneous dispersion after more than three months. After standing for 90 days, the Brunauer–Emmett–Teller specific surface area of GO decreased from 353 to 214 m2 · g−1, while that of PEI-GO remained almost unchanged (from 432 to 413 m2 · g−1). The PEI-GO exhibited significantly faster kinetic and higher adsorption capacity for MO than GO. Moreover, PEI-GO had a good adsorption capacity in the acidic range, and the highest adsorption of MO occurred at pH = 6.0. The adsorption of MO on PEI-GO was an endothermic, spontaneous and physisorption process.

Reduced and Surface‐Modified Graphene Oxide with Nonlinear Resistivity

2017 ◽  
Vol 38 (16) ◽  
pp. 1700291 ◽  
Author(s):  
Martin Wåhlander ◽  
Fritjof Nilsson ◽  
Richard L. Andersson ◽  
Anna Carlmark ◽  
Henrik Hillborg ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Modified Graphene Oxide ◽  
Surface Modified ◽  
Modified Graphene

Fabrication and characterization of in situ graphene oxide reinforced high-performance shape memory polymeric nanocomposites from vegetable oil

RSC Advances ◽  
2016 ◽  
Vol 6 (33) ◽  
pp. 27648-27658 ◽  
Author(s):  
Rakesh Das ◽  
Sovan Lal Banerjee ◽  
P. P. Kundu
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Linseed Oil ◽  
Polymeric Nanocomposites ◽  
Modified Graphene Oxide ◽  
Fabrication And Characterization ◽  
Surface Modified ◽  
Modified Graphene

Polymeric nanocomposites have been fabricated via in situ cationic polymerization of linseed oil in the presence of surface-modified graphene oxide (SGO).

scholarly journals Organic Functionalized Graphene Oxide Behavior in Water

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1228
Author(s):  
Changwoo Kim ◽  
Junseok Lee ◽  
Will Wang ◽  
John Fortner
Keyword(s):  
Graphene Oxide ◽  
Divalent Cations ◽  
Critical Role ◽  
Functionalized Graphene Oxide ◽  
Organic Functionalization ◽  
Chemical Structures ◽  
Modified Graphene Oxide ◽  
Surface Modified ◽  
Modified Graphene ◽  
Hydrophilic Coatings

Surface modified graphene oxide (GO) has received broad interest as a potential platform material for sensors, membranes, and sorbents, among other environmental applications. However, compared to parent (unmodified) GO, there is a dearth of information regarding the behavior of subsequently (secondary) modified GO, other than bulk natural organic matter (NOM) coating(s). Here, we systematically explore the critical role of organic functionalization with respect to GO stability in water. Specifically, we synthesized a matrix of GO-based materials considering a carefully chosen range of bound organic molecules (hydrophobic coatings: propylamine, tert-octylamine, and 1-adamantylamine; hydrophilic coatings: 3-amino-1-propanol and 3-amino-1-adamantanol), so that chemical structures and functional groups could be directly compared. GO (without organic functionalization) with varying oxidation extent(s) was also included for comparison. The material matrix was evaluated for aqueous stability by comparing critical coagulation concentration (CCC) as a function of varied ionic strength and type (NaCl, CaCl2, MgCl2, and MgSO4) at pH 7.0. Without surface derivatization (i.e., pristine GO), increased stability was observed with an increase in the GO oxidation state, which is supported by plate–plate Derjaguin, Landau, Verwey and Overbeek (DLVO) energy interaction analyses. For derivatized GO, we observed that hydrophilic additions (phi-GO) are relatively more stable than hydrophobic organic coated GO (pho-GO). We further explored this by altering a single OH group in the adamantane-x structure (3-amino-1-adamantanol vs. 1-adamantylamine). As expected, Ca2+ and monovalent co-ions play an important role in the aggregation of highly oxidized GO (HGO) and phi-GO, while the effects of divalent cations and co-ions were less significant for pho-GO. Taken together, this work provides new insight into the intricate dynamics of GO-based material stability in water as it relates to surface functionalization (surface energies) and ionic conditions including type of co- and counter-ion, valence, and concentration.

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