Self-supporting graphene oxide films preparation and characterization methods

Torrisi, A.; Cutroneo, M.; Havránek, V.; Silipigni, L.; Fazio, Barbara; Fazio, M.; Marco, G. Di; Stassi, A.

doi:10.1016/j.vacuum.2018.11.001

Cited by 50 publications

(15 citation statements)

References 29 publications

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“…FTIR characterization of synthesized graphene oxide by the modified Hummers method [ 16 ] showed the characteristic bands of this material reported by other authors ( Figure 2 a). At 3369 and 1046 cm −1 , the stretching vibrations of the hydroxyl functional group; at 1729 cm −1 , the vibration of the carbonyl group (C=O); at 1620 cm −1 , the vibration of the double bond C=C of the aromatic structure of GO; at 1374 cm −1 , the vibration of the carboxyl group; and at 1224 cm −1 , the characteristic peak of the epoxy group [ 20 , 22 , 23 , 24 , 25 ]. DLS results ( Figure 2 b) show an average particle size of 400 nm for GO sheets.…”

Section: Resultsmentioning

confidence: 99%

Acrylic Bone Cements Modified with Graphene Oxide: Mechanical, Physical, and Antibacterial Properties

et al. 2020

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Bacterial infections are a common complication after total joint replacements (TJRs), the treatment of which is usually based on the application of antibiotic-loaded cements; however, owing to the increase in antibiotic-resistant microorganisms, the possibility of studying new antibacterial agents in acrylic bone cements (ABCs) is open. In this study, the antibacterial effect of formulations of ABCs loaded with graphene oxide (GO) between 0 and 0.5 wt.% was evaluated against Gram-positive bacteria: Bacillus cereus and Staphylococcus aureus, and Gram-negative ones: Salmonella enterica and Escherichia coli. It was found that the effect of GO was dependent on the concentration and type of bacteria: GO loadings ≥0.2 wt.% presented total inhibition of Gram-negative bacteria, while GO loadings ≥0.3 wt.% was necessary to achieve the same effect with Gram-positives bacteria. Additionally, the evaluation of some physical and mechanical properties showed that the presence of GO in cement formulations increased wettability by 17%, reduced maximum temperature during polymerization by 19%, increased setting time by 40%, and increased compressive and flexural mechanical properties by up to 17%, all of which are desirable behaviors in ABCs. The formulation of ABC loading with 0.3 wt.% GO showed great potential for use as a bone cement with antibacterial properties.

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Section: Resultsmentioning

confidence: 99%

Acrylic Bone Cements Modified with Graphene Oxide: Mechanical, Physical, and Antibacterial Properties

et al. 2020

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“…Such target was chosen for the interest toward an innovative foil containing high carbon and hydrogen concentration, mechanically high resistant and ready to become reduced and highly conductive just irradiated by the laser pulse, in accordance with the literature [7]. The target preparation method is described in our previous paper [8].…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, in the forward surface, we assume a thin layer of impurity (20 nm), containing 2000 particles of each charge, from 1þ to 6þ of carbon, and 1500 proton particles. Really we know that the hydrogen concentration in graphene oxide (GO) is less than 1% [8], but this assumption permits one to increase particles statistics. The temperature of all particles is initiated to 1 keV.…”

Section: A Pic Simulation Proceduresmentioning

confidence: 99%

Ion acceleration by fs laser in target-normal-sheath-acceleration regime and comparison of time-of-flight spectra with particle-in-cell simulations

Torrisi

Costa

2020

Phys. Rev. Accel. Beams

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The ions acceleration through an fs laser irradiating a reduced graphene oxide foil in a target-normalsheath-acceleration regime is investigated using a SiC detector connected in time-of-flight configuration. The experimental data indicated maximum proton energy of 1.8 MeV and a large number of carbon ions accelerated at different energies depending on their charge state. Particle-in-cell (PIC) simulations were applied to the studied target given the electron density as a function of the space and time and permitted one to evaluate the electrical field developed in the rear side of the foil driving the forward ion acceleration. The simulation indicates that the carbon ions are subjected to a lower acceleration with respect to protons, due to their slow velocity, depending on the charge-to-mass ratio. The latter does not permit carbon ions to be affected by the maximum electric field but a lower intensity due to the fast time decay of the electric field. Considering the angular emission of protons and the six carbon ions, the charge particles assume a Boltzmann energy distribution with a fixed cutoff at high energy, in agreement with the experimental measurements of ion energy.

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“…Moreover, gafchromic detectors, HD‐V2 type, adapt for real‐time ion detection and low doses (0.1Gy up to 1 kGy), are employed to detect the accelerated ions from the non‐equilibrium plasma. More details on the used gafchromic are reported in a previous article …”

Section: Experimental Set‐upsmentioning

confidence: 99%

Tantalum ion acceleration in laser‐generated plasma and dependence on the pulse duration

Torrisi

Cutroneo

Torrisi

2019

Contributions to Plasma Physics

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The laser irradiation of tantalum targets is presented for different pulsed laser intensities ranging from 1010 up to about 1018 W/cm2 and pulse durations from 9 ns up to 40 fs. The results show that the produced non‐equilibrium plasma accelerates Ta ions in the backward direction from values of the order of keV up to values of about 5 MeV. In thin foils, the forward plasma, developed behind the target along the direction of incoming laser, at intensities of about 1016 W/cm2 and 300 ps pulse duration, accelerates Ta ions at energies of the order of 4.6 MeV and produces charge states up to about 40+. For fs lasers at intensities of the order of 1018 W/cm2, only proton acceleration occurs up to 2.1 MeV while no Ta ions are accelerated, due to the reduced duration of the electric field and to the too high inertial mass of the Ta ions.

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Self-supporting graphene oxide films preparation and characterization methods

Cited by 50 publications

References 29 publications

Acrylic Bone Cements Modified with Graphene Oxide: Mechanical, Physical, and Antibacterial Properties

Acrylic Bone Cements Modified with Graphene Oxide: Mechanical, Physical, and Antibacterial Properties

Ion acceleration by fs laser in target-normal-sheath-acceleration regime and comparison of time-of-flight spectra with particle-in-cell simulations

Tantalum ion acceleration in laser‐generated plasma and dependence on the pulse duration

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