Gas desorption and adsorption properties of carbon based material used for cathode ray tube

Hashiba, Masao; Hino, Tomoaki; Hirohata, Yuko; Shinbori, H.; Deyama, Sadao; Chiyoda, Hironobu

doi:10.1016/s0040-6090(98)01030-x

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The voids within the parts were attributed to gas desorption from the graphite particles that trapped bubbles within the molten polymer. In experiments conducted by Hashiba et al , mixtures containing graphite powder showed a peak in CO 2 desorption at 200°C (Hashiba et al , 1998). Similar temperatures were achieved during the RF heating experiments to ensure melting of the polymer, and thus gas desorption within the molten parts was possible.…”

Section: Resultsmentioning

confidence: 99%

Volumetric fusion of graphite-doped nylon 12 powder with radio frequency radiation

Allison

Pearce

Beaman

et al. 2021

RPJ

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Purpose Additive manufacturing (AM) of thermoplastic polymers for powder bed fusion processes typically requires each layer to be fused before the next can be deposited. The purpose of this paper is to present a volumetric AM method in the form of deeply penetrating radio frequency (RF) radiation to improve the speed of the process and the mechanical properties of the polymer parts. Design/methodology/approach The focus of this study was to demonstrate the volumetric fusion of composite mixtures containing polyamide (nylon) 12 and graphite powders using RF radiation as the sole energy source to establish the feasibility of a volumetric AM process for thermoplastic polymers. Impedance spectroscopy was used to measure the dielectric properties of the mixtures as a function of increasing graphite content and identify the percolation limit. The mixtures were then tested in a parallel plate electrode chamber connected to an RF generator to measure the heating effectiveness of different graphite concentrations. During the experiments, the surface temperature of the doped mixtures was monitored. Findings Nylon 12 mixtures containing between 10% and 60% graphite by weight were created, and the loss tangent reached a maximum of 35%. Selective RF heating was shown through the formation of fused composite parts within the powder beds. Originality/value The feasibility of a novel volumetric AM process for thermoplastic polymers was demonstrated in this study, in which RF radiation was used to achieve fusion in graphite-doped nylon powders.

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Section: Resultsmentioning

confidence: 99%

Volumetric fusion of graphite-doped nylon 12 powder with radio frequency radiation

Allison

Pearce

Beaman

et al. 2021

RPJ

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“…The WCP collected from the recycling enterprises are always mixed with impurities such as glass cullet (SiO 2 and PbO), aluminum foils (Al), and dust, etc. 19 In our work, a simple gradation sieving method was employed to remove these impurities, and a series of sieves with different mesh sizes were used (Figure S1a). Figure 1a shows the compositions of the powders at different sieve fractions, analyzed using XRF.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Reclamation and Harmless Treatment of Waste Cathode Ray Tube Phosphors: Novel and Sustainable Design

Yin

Tian

et al. 2018

ACS Sustainable Chem. Eng.

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In this paper, we propose a novel and sustainable process for recycling rare earths (REs) and zinc (Zn) simultaneously from waste cathode ray tube (CRT) phosphors. First, 95% of the impurities such as glass cullets and aluminum foils are removed by simple screening. Then, a selfpropagating, high-temperature synthesis reaction following a water-leaching process is performed to recycle Zn selectively. The REs are recycled by a combined process of oxidative leaching and ionic-liquid-based extraction. They are then regenerated to form a new Y 2 O 3 :Eu 3+ phosphor. By following this green recycling design, the recovery efficiencies of REs and Zn reach 99.5% and 99%, respectively. The negative bivalent sulfur in ZnS and Y 2 O 3 :Eu 3+ is converted completely to SO 4 2− , which efficiently avoids the secondary pollution. It should also be pointed out that the main recovery processes are all carried out at room temperature, and the "three wastes" emissions are minimized throughout the process. This work is expected to open new avenues for highly efficient, energy-saving, and pollutionreducing recovery processes for waste CRT phosphors.

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“…14) Water and carbon dioxide adsorption measurements were carried out for the characterization of carbon-based coating materials. 15) In addition, highly sensitive detection technologies for volatile organic compounds are required. The quartz crystal microbalance (QCM) method is one of the effective methods for such detection.…”

Section: Introductionmentioning

confidence: 99%

Gas Adsorption Properties of Fluorocarbon Thin Films Prepared Using Three Different Types of RF Magnetron Sputtering Systems

Iwamori

Hasegawa

Yano

et al. 2010

Jpn. J. Appl. Phys.

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Fluorocarbon thin films were deposited onto a quartz crystal with a poly(tetrafluoroethylene) target using three different types of RF magnetron sputtering systems with strong, weak, and unbalanced magnetic fields. The adsorption properties of these thin films for water, ethanol, acetone, acetaldehyde, toluene, and methyl salicylate were evaluated using the quartz crystal microbalance (QCM) method in order to characterize the surface properties of these thin films. These thin films have low sensitivities to non-polar solvents that contain methyl and aromatic groups, and high sensitivities to polar solvents that contain carbonyl and hydroxyl groups. Chemical structures, especially, polar moieties in these fluorocarbon thin films would affect the gas adsorption properties.

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Gas desorption and adsorption properties of carbon based material used for cathode ray tube

Cited by 4 publications

References 6 publications

Volumetric fusion of graphite-doped nylon 12 powder with radio frequency radiation

Volumetric fusion of graphite-doped nylon 12 powder with radio frequency radiation

Reclamation and Harmless Treatment of Waste Cathode Ray Tube Phosphors: Novel and Sustainable Design

Gas Adsorption Properties of Fluorocarbon Thin Films Prepared Using Three Different Types of RF Magnetron Sputtering Systems

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