experimental study of laser irradiated graphite oxidation

Pulsed Laser Ablation of Graphite Target in Dimethyformamide

5 cm focal-length plano-convex lens on the surface of the graphite target. Laser energy employed in this study was 3.0 J/pulse. Pulse repetition rate and pulse duration were 2 Hz and 5 ms, respectively. After 5,000 pulses of laser ablation, the target was Fig. 1.

Graphite oxide

Graphite oxide, formerly called graphitic oxide or graphitic acid, is a compound of carbon, oxygen, and hydrogen in variable ratios, obtained by treating graphite with strong oxidizers and acids for resolving of extra metals.The maximally oxidized bulk product is a yellow solid with C:O ratio between 2.1 and 2.9, that retains the layer structure of graphite but with a much larger and irregular

Examination of Surface Deposits on Oldbury Reactor Core

2016/10/5Treatment and disposal of irradiated graphite and other carbonaceous waste. ATW - International Journal for Nuclear Power. 2011;56(4-5):263–269. View Article Google Scholar 41. Handy BJ. Experimental Study of C-14 and H

Characterization of nuclear graphite elastic properties

Laser ultrasonic line source methods have been used to study elastic anisotropy in nuclear graphites by measuring shear wave birefringence. Depending on the manufacturing processes used during production, nuclear graphites can exhibit various degrees of material anisotropy related to preferred crystallite orientation and to microcracking.

Study on the oxidation of WC

2021/1/1The laser energy density is a main factor that greatly affects the laser irradiated temperature and the induced oxidation. The energy density of laser beam can be calculated from: (1) E = P fA = 4 P π f D 2 where E is the laser energy density, P is the averaging laser power, A is the irradiated area of laser beam, D is the spot diameter and f is the pulse repetition rate.

(PDF) Surface characterisation of laser irradiated SiC

Within sputter depth the steady state in the laser irradiated area can be described as a mixture of Si, graphite and siliconoxycarbide with a small amount of SiC only. The lapped sample and the wear tracks, respectively, are mainly composed of SiC and are covered by a very thin oxide only.

(PDF) Raman study of single wall carbon nanotube thin

Our experimental results indicate that the red excitation versus excitation laser power when irradiated with 532, 633 and line probes the Raman spectra of SWCNT and substrate bulk, while 780 nm excitation laser lines, respectively (Fig. 2a).

GAMMA RADIATION EFFECTS ON NUCLEAR RECTOR GRADES GRAPHITE

Transactions, SMiRT-23 Manchester, United Kingdom - August 10-14, 2015 Division IV, Paper ID 157 GAMMA RADIATION EFFECTS ON NUCLEAR RECTOR GRADES GRAPHITE Ram Krishna 1, Abbie N Jones 2, and Barry J Marsden 2 1 Dalton Cumbrian Facility, Dalton Nuclear Institute, The University of Manchester, Westlakes Science

Thermal Oxidation and Subsequent Characterisation of

Gilsocarbon is a graphite grade used as a main structural proponent of the current UK fleet of Advanced Gas-Cooled Reactors. In this research, multiple gilsocarbon graphite samples were thermally oxidised in an attempt to simulate the effects on the graphite of radiolytic oxidation, which occurs in the reactors core. A combined technique of characterising and thermally oxidised samples

On the nature of cracks and voids in nuclear graphite

This paper extends this work and presents a study of microcracks in irradiated graphite samples removed from the British Experimental Pile 'O' (BEPO) reactor as well as in non-irradiated Pile Grade A (PGA) graphite for comparative purposes. Using TEM

Kinetics of Graphite Oxidation in Reacting Flow from Imaging

AFIT-ENP-DS-16-S-024 Abstract This work focuses on the characterization of laser irradiated graphite oxidation using mid-wave infrared (MWIR) imaging Fourier transform spectroscopy (IFTS). Al-though graphite oxidation has been studied extensively, IFTS uniquely

Materials

In order to clearly understand the details of ZrO2 formation during ablation, high intensity continuous laser was chosen to irradiate ZrB2/SiC. The results reveal that there are two different modes of ZrO2 formation depending on whether liquid SiO2 is present. When liquid SiO2 is present, ZrO2 generated by the oxidation of ZrB2 is firstly dissolved into SiO2. Then, ZrO2 will precipitate again

Materials

In order to clearly understand the details of ZrO2 formation during ablation, high intensity continuous laser was chosen to irradiate ZrB2/SiC. The results reveal that there are two different modes of ZrO2 formation depending on whether liquid SiO2 is present. When liquid SiO2 is present, ZrO2 generated by the oxidation of ZrB2 is firstly dissolved into SiO2. Then, ZrO2 will precipitate again

Resonance Raman study on photoreduction of cytochrome

1985/12/17Resonance Raman study on photoreduction of cytochrome c oxidase: distinction of cytochromes a and a3 in the intermediate oxidation states. Ogura T, Yoshikawa S, Kitagawa T. Occurrence of photoreduction of bovine cytochrome c oxidase was confirmed with the difference absorption spectra and oxygen consumption measurements for the enzyme irradiated with laser light

Oxidation of a Graphite Surface: The Role of Water

On the basis of density functional calculations, we demonstrate a significant difference in oxidation patterns between graphene and graphite and the formation of defects after oxidation. Step-by-step modeling demonstrates that oxidation of 80% of the graphite surface is favorable. Oxidation above half of the graphite surface significantly decreases the energy costs of vacancy formation with

The effect of thermal oxidation on the coefficient of

Nuclear graphite has been used in nuclear reactors for almost 80 years, its material behavior after oxidation and irradiation is still not fully understood. In this paper, an old question of why the oxidation has a considerable effect on Young's modulus but not on the coefficient of thermal expansion (CTE) is tried to be answered. The multi-scale finite-element method was used to analyze CTE

The effects induced by proton irradiation on structural

A grade TSX graphite was irradiated by a 2.5 MeV proton and a dose of 1.47 1018 ion cm−2 at 330 K. The displacement per atom under this irradiation condition was about 0.02. The lattice parameter, crystallite size and the vacancies density in the graphite was measured before and after irradiation. It was found that the proton irradiation led to an increase in the volume of the sample. The

LDPE Oxidation by CO2 Laser Radiation (10.6 m)

In this work, we have studied the oxidation of LDPE when it is irradiated with CO 2 laser radiation (10.6 μm), obtaining an oxidized PE, by a physical process, with similar spectroscopic properties to those of PE-BIO obtained by chemical process. 2. Methodology

Experimental study of laser irradiated graphite oxidation

2018/6/1Graphite oxidation is investigated at varying porosity and laser irradiance, resulting in surface temperatures of 1500–3100 K. Samples are irradiated using a 1.07 m fiber laser at irradiances of 1000 and 3600 W/cm 2 in dry air environment (20% O 2, 1% H 2 O) at atmospheric pressure, producing a buoyant flow.

Characterization of structural defects in nuclear

The current study performs a comparative analysis of IG-110 nuclear graphite and A3 graphite matrix, by X-ray Diffraction (XRD), Raman,more At 10 kPa, the RCS occupied by H 2 uptake per number of carbon atoms at the edge of a crystallite, H/C edge, is 600(300) appm

Thermal oxidation of nuclear graphite: A large scale waste

2017/8/9This study has investigated the laboratory scale thermal oxidation of nuclear graphite, as a proof-of-concept for the treatment and decommissioning of reactor cores on a larger industrial scale. If showed to be effective, this technology could have promising international significance with a considerable impact on the nuclear waste management problem currently facing many countries

Ablation Behavior of Plasma

Thus, in this study, laser irradiation experiments were performed to study the effect of high-intensity continuous laser on the ablation behavior of the La 1–x Sr x TiO 3+δ coating. The results show that the La 1– x Sr x TiO 3+δ coating undergoes three ablation stages during laser irradiation: coating oxidation, formation and growth of new structures (columnar and dendritic crystals

Reduction of Graphene Oxide by Laser Scribing in Different

Laser scribing, by far proposed as a method for efficiently transforming graphene oxide into reduced graphene, has been employed, using a CW laser beam, to study the modifications of graphene oxide scribed under different controlled atmospheres, including air, N

Broadband absorption of nanostructured stainless steel

2020/2/6Figure 2 shows the optical microscope images of nanosecond irradiated substrates with different fluences (A1–A5 as per table 1).The FSESM images at the 100 μm scale bar show that all macroscopic surface morphologies of substrates were more or less similar to having the same features, as shown in the middle column of figure 2; one can observe the track of the laser scanning.

Graphite oxide

Graphite oxide, formerly called graphitic oxide or graphitic acid, is a compound of carbon, oxygen, and hydrogen in variable ratios, obtained by treating graphite with strong oxidizers and acids for resolving of extra metals.The maximally oxidized bulk product is a yellow solid with C:O ratio between 2.1 and 2.9, that retains the layer structure of graphite but with a much larger and irregular

An experimental study on the preparation of gold nanoparticles

Laser ablation of bulk gold means that the metal is irradiated by a laser leading to the formation of colloidal gold. The main advantage is the high purity of the nanoparticles and the fact that it can be performed in any solution. Chapter 4 dis-cusses laser ablation in

Reduction of Graphene Oxide by Laser Scribing in Different

Laser scribing, by far proposed as a method for efficiently transforming graphene oxide into reduced graphene, has been employed, using a CW laser beam, to study the modifications of graphene oxide scribed under different controlled atmospheres, including air, N

Pulsed Laser Ablation of Graphite Target in Dimethyformamide

5 cm focal-length plano-convex lens on the surface of the graphite target. Laser energy employed in this study was 3.0 J/pulse. Pulse repetition rate and pulse duration were 2 Hz and 5 ms, respectively. After 5,000 pulses of laser ablation, the target was Fig. 1.

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