Structural and vibrational study of graphene oxide via coronene based models: theoretical and experimental results

This paper reports the development of simple and economical reduced graphene oxide (rGO) based screen-printed electrodes (SPE) for five basic taste sensing applications. Twenty different test solutions for the five tastes of salty, sour, sweet, umami, and bitter at 1 ppm, 10 ppm, 100 ppm, 1000 ppm concentration levels were tested with the fabricated SPEs. From experimental results, electrical signals generated between the electrode and test solution interface were measured using the potentiometric method. Satisfactory potentiometric responses of SPEs to different ppm concentrations for each sample were used to analyze the sample data. Histogram using the statistical tool was used to analyze the changes in the conductivity response. A multivariate Principal Component Analysis (PCA) statistical tool correlated using loading plots between variables and factors of all the five basic tastes. The plot showed the interrelation between variables and test samples. The obtained experimental results from these rGO based SPEs make them suitable for their use in taste sensing applications such as for any taste disorder disability, food-producing industry, pharmaceutical industries, etc.

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Structural and vibrational study of 2-MethoxyEthylAmmonium Nitrate (2-OMeEAN): Interpretation of experimental results with ab initio molecular dynamics

The Journal of Chemical Physics ◽

10.1063/1.4956459 ◽

2016 ◽

Vol 145 (2) ◽

pp. 024507 ◽

Cited By ~ 8

Author(s):

M. Campetella ◽

D. Bovi ◽

R. Caminiti ◽

L. Guidoni ◽

L. Bencivenni ◽

...

Keyword(s):

Molecular Dynamics ◽

Ab Initio ◽

Experimental Results ◽

Ab Initio Molecular Dynamics ◽

Vibrational Study

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Flame retardance of modified graphene to pure cotton fabric

Journal of Fire Sciences ◽

10.1177/0734904117748118 ◽

2017 ◽

Vol 36 (2) ◽

pp. 111-128 ◽

Cited By ~ 3

Author(s):

Hong Liu ◽

Yang Du ◽

Guohai Yang ◽

Guoqing Zhu ◽

Yunji Gao ◽

...

Keyword(s):

Graphene Oxide ◽

Flame Retardant ◽

Cotton Fabric ◽

Combustion Process ◽

Experimental Results ◽

Graphene Oxides ◽

Nitrogen Doped ◽

Nitrogen Doped Graphene ◽

Doped Graphene ◽

Phosphorus Doped

Phosphorus- and nitrogen-doped graphene oxides are conveniently obtained by the modification of as-prepared graphene oxide and characterized by scanning electron microscopy, X-ray powder diffraction, Fourier-transform infrared, and ultraviolet–visible spectra. The combustion performances of pure cotton fabric, respectively, enriched with graphene oxide, phosphorus-doped graphene oxide, and nitrogen-doped graphene oxides, are tested and evaluated. The results show that phosphorus-doped graphene oxide acts as the most promising flame retardant, which can effectively reduce the burning rate and heat release rate of the combustion process, with excellent smoke suppression effect. Based on the relevant parameters obtained from the experimental results of phosphorus-doped graphene oxide, Simtec simulation is operated to demonstrate vertical combustion of thin fabric before and after flame-retardant treatment, and the results are consistent with the trend of the experimental results and suggest a magnifying effect of phosphorus-doped graphene oxide.

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Significant Fatigue Life Enhancement in Multiscale Doubly-Modified Fiber/Epoxy Nanocomposites with Graphene Nanoplatelets and Reduced-Graphene Oxide

Polymers ◽

10.3390/polym12092135 ◽

2020 ◽

Vol 12 (9) ◽

pp. 2135

Author(s):

Mohammad Rafiee ◽

Somayeh Hosseini Rad ◽

Fred Nitzsche ◽

Jeremy Laliberte ◽

Michel R. Labrosse

Keyword(s):

Graphene Oxide ◽

Fatigue Life ◽

Reduced Graphene Oxide ◽

Composite Laminates ◽

Fatigue Behavior ◽

Cost Effective ◽

Mechanical Analysis ◽

Graphene Nanoplatelets ◽

Experimental Results ◽

Reduced Graphene

We report the fatigue behavior of a novel multiscale fiberglass/epoxy composite modified with reduced-graphene oxide (rGO) and graphene nanoplatelets (GNP). A novel and cost-effective fabrication method based on vacuum assisted resin transfer molding (VARTM) method was used for manufacturing the composite laminates. Morphological and mechanical analysis of composites showed a successful dispersion of nano-fillers and a remarkable improvement in fatigue life of the nanocomposites. The experimental results revealed that all rGO concentrations resulted in a significant increase in fatigue life of the nanocomposites. These enhancements can be explained by the creation of stronger links between the nanoparticles fiberglass and epoxy. The experimental results also showed that lower concentrations of GNPs lead to an increase in fatigue life of nanocomposites; however, a decrease in their fatigue life can be seen at higher loadings.

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Passively Q-switched Erbium-Doped Fiber Laser based on Graphene Oxide as Saturable Absorber

Journal of Optical Communications ◽

10.1515/joc-2016-0154 ◽

2018 ◽

Vol 39 (3) ◽

pp. 307-310 ◽

Cited By ~ 2

Author(s):

A. K. W. Mansoor ◽

Belal Ahmed Hamida ◽

Tawfig Eltaif ◽

E. I. Ismail ◽

N. A. A. Kadir ◽

...

Keyword(s):

Graphene Oxide ◽

Fiber Laser ◽

Saturable Absorber ◽

Pulse Width ◽

Laser Cavity ◽

Experimental Results ◽

Laser Output ◽

Output Energy ◽

Erbium Doped

Abstract In this paper, passively Q-switched fiber laser is demonstrated and the laser output energy is stabilized by using 2.4 m Erbium-doped fiber laser (EDFL) with a graphene oxide used as saturable absorber (GO-SA). According to the experimental results in the Q-switched configuration, the laser cavity emits a wavelength centered at 1,558.75 nm, and by inserting the GO-SA into EDFL cavity, hence, the laser output energy around 1.68 nJ with an FWHM pulse width of 2.3 µs at 123.5 kHz was achieved.

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Mass Transfer Through Graphene-Based Membranes

Applied Sciences ◽

10.3390/app10020455 ◽

2020 ◽

Vol 10 (2) ◽

pp. 455

Author(s):

Valerij Levdansky ◽

Olina Šolcová ◽

Karel Friess ◽

Pavel Izák

Keyword(s):

Mass Transfer ◽

Graphene Oxide ◽

Kinetic Parameters ◽

Resonance Radiation ◽

Experimental Results ◽

Surface Processes ◽

Graphene Sheets ◽

External Fields ◽

Nanoporous Graphene ◽

Gas Molecules

The problems related to the transport of gases through nanoporous graphene (NG) and graphene oxide (GO) membranes are considered. The influence of surface processes on the transport of gas molecules through the aforementioned membranes is studied theoretically. The obtained regularities allow finding the dependence of the flux of the gas molecules passing through the membrane on the kinetic parameters which describe the interaction of the gas molecules with the graphene sheets. This allows to take into account the influence of external fields (e.g., resonance radiation), affecting the aforementioned kinetic parameters, on the transport of gas molecules through the membranes. The proposed approach makes it possible to explain some experimental results related to mass transfer in the GO membranes. The possibility of the management of mass transfer through the NG and GO membranes using resonance radiation is discussed.

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A study on interfacial behaviors of epoxy/graphene oxide derived from pitch-based graphite fibers

Nanotechnology Reviews ◽

10.1515/ntrev-2021-0111 ◽

2021 ◽

Vol 10 (1) ◽

pp. 1827-1837

Author(s):

Seong-Hwang Kim ◽

Yinhang Zhang ◽

Jong-Hoon Lee ◽

Seul-Yi Lee ◽

Yeong-Hun Kim ◽

...

Keyword(s):

Fracture Toughness ◽

Graphene Oxide ◽

Thermophysical Properties ◽

Epoxy Matrix ◽

Flexural Modulus ◽

Experimental Results ◽

Wide Range ◽

Graphite Fibers ◽

Graphene Structures ◽

Multifunctional Properties

Abstract Graphene oxide (GO) is a versatile material with inherent unique properties that can be used in a wide range of applications. GO is produced from graphitic materials including graphite, and its properties can depend on the nature of stacking in the graphene structures. In this study, GO was prepared from pitch-based graphite fibers via the modified Hummer’s method and subsequently incorporated into an epoxy matrix to obtain graphene-loaded nanocomposites (EP/GO). Presented experimental results revealed that the addition of 0.6 wt% GO yielded an ∼110% increase in the fracture toughness. The corresponding fracture energies as well as the flexural strengths and flexural modulus exhibited similar trends to the fracture toughness. The thermophysical properties of the EP/GO, to further demonstrate the reinforcing effectiveness of GO, were also observed. Collectively, these results indicate that GO investigated in the study can be a viable reinforcement candidate to develop next-generation nanocomposites with multifunctional properties.

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