Application of low temperature plasmas for restoration/conservation of archaeological objects

Krčma, František; Blahová, Lucie; Fojtíková, Petra; Graham, Willam G.; Grossmannová, Hana; Hlochová, Lenka; Horak, J.; Janova, D.; Kelsey, Colin; Kozáková, Zdenka; Mazánková, Věra; Procházka, Michal; Přikryl, Radovan; Řádková, Lucie; Sazavska, Vera; Vašíček, Michal; Veverková, R; Zmrzlý, Martin

doi:10.1088/1742-6596/565/1/012012

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…Low temperature plasma has been applied for modification of material surfaces to change water surface angle, to improve coating properties, to preserve archeological objects, etc. [ 34 – 46 ]. Non-equilibrium plasma has been used to decontaminate seeds from pathogens, to improve their germination properties and length of sprouts [ 47 – 61 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of atmospheric pressure plasma jet operating with DBD on Lavatera thuringiaca L. seeds’ germination

et al. 2018

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The paper presents the results of an experiment on the effect of pre-sowing stimulation of seeds with atmospheric pressure plasma jet operating with dielectric barrier discharge (DBD plasma jet) on the process of germination of Thuringian Mallow (Lavatera thuringiaca L.). Five groups of seeds characterized by a different exposure times (1, 2, 5, 10 and 15 minutes) as well as untreated seeds—control were used. Pre-sowing plasma stimulation of seeds improved germination parameters such as: germination capacity and germination energy for all tested groups relative to control. The highest germination parameters were obtained for seeds stimulated with plasma for the exposure times of 2 and 5 min. The analysis of the contact surface angle indicated the decrease of its’ mean values upon seed stimulation while no statistical effects were observed. Analysis of the SEM scans revealed the increase in seed pattern intensity which could be attributed to removing of the surface parts of cuticle possibly covered with wax upon short time—2 and 5 min plasma treatment. Such a phenomenon can act similarly to mechanical scarification of seeds. Longer exposure of seeds to plasma resulted in affecting the deeper zone of cuticle and damage or fracture of some parts of the cuticle. Lower germination parameters of seeds upon longer exposure times to plasma may indicate mechanical damage of the seeds.

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Section: Introductionmentioning

confidence: 99%

Effects of atmospheric pressure plasma jet operating with DBD on Lavatera thuringiaca L. seeds’ germination

et al. 2018

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“…The EDS analysis areas are 150 × 90 μm in these experiments. The crystalline phases of the corrosion sheet sample (copper foil covered by corrosion layer) were determined by X-ray diffraction (XRD Rigaku Smartlab 9) with Cu Kα radiation (λ = 1.5406 Å) and the assignment of phases was based on the JPDS powder diffraction cards [24]. According to many specialists, X-ray photoelectron spectra (XPS) of the samples were determined using an ESCALAB 250 + instrument (Thermo Fischer, EACALAB 250Xi) to obtain the valence, and calibration was carried out by C1s peak (binding energy = 284.8 eV) [12,28,29].…”

Section: Analysis and Characterizationmentioning

confidence: 99%

“…Usually, hydrogen gas has been widely employed in plasma treatment based on the fact that most of the corrosion products are metal oxides or chlorides [21,22]. During this process, the hydrogen species will react with oxygen and chlorine, resulting in the formation of OH radicals and HCl molecules that can be consequently removed from the reaction system [23,24]. Compared to the traditional methods, the modern plasma chemical treatment is a dry method, which prevents further corrosion caused by water during the treatment [25].…”

Section: Introduction and Research Aimmentioning

confidence: 99%

Application of low-temperature plasma for the removal of copper chloride layers on bronze Wares

Jiao

Sun

2023

Herit Sci

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Archaeological objects based on copper alloys (such as bronze wares) usually suffer from “bronze disease” that results from the existence of CuCl on the surfaces. The surface-coating Cu2(OH)3Cl can release Cl− and lead to further corrosion during the storage procedure. The central aim of the work is the verity the effectiveness of low-temperature radio-frequency (RF) plasma for the removal of CuCl and Cu2(OH)3Cl from the bronze wares. In this work, CuCl and Cu2(OH)3Cl patina were synthesized on copper by a simple solution method. The chemical and aesthetic features before and after plasma treatment were characterized using optical microscopy (OM), SEM-EDS, XRD, and XPS. The results show that Ar-H2 plasma could reduce the CuCl to Cu efficiently, which achieves pleasing esthetics as well as removes the chlorine (Cl atomic ratio decrease from 46.0 to 3.6%). For Cu2(OH)3Cl, the air plasma treatment exhibit better performance compared to the Ar-H2 plasma treatment, judging from the aesthetic effect and the removal effect of chlorine (Cl atomic ratio decrease from 14.8 to 3.3%).

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“…Compared with alkanes and aromatic hydrocarbons, halogenated hydrocarbons have higher energy consumption, which indicates that the decomposition of halogenated hydrocarbons requires more energy. (Krčma et al 2014).…”

Section: Knife-shaped Electrode Ga Reactormentioning

confidence: 99%

Decomposition of volatile organic compounds using gliding arc discharge plasma

Gong

Lin

et al. 2020

Journal of the Air & Waste Management Association

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This work provides a systematic review on the decomposition of volatile organic pollutants in flue gas through the gliding arc (GA) plasma technology. To begin with, the basic mechanisms of GA plasma generation are summarized and three characteristic stages existed during the GA plasma generation process are revealed: gas breakdown stage, equilibrium stage, and non-equilibrium stage. Then, the types of GA reactors are comparatively illustrated. Possible destruction mechanisms of volatile organic compounds (VOCs) by GA plasma are discussed by taking chloroform, benzene, and methanol as examples. Furthermore, the effects of many operating parameters on the VOCs destruction efficiency are comprehensively analyzed. Simultaneously, the product distribution, energy cost, technical and economic during the whole decomposition process are considered. Finally, the advantages and disadvantages of GA plasma and its further development trend are concluded from the academic and industrial application of GA plasma in VOCs decomposition.Implications: This paper comprehensively describes the principle, characteristics, research progress and engineering application examples of the degradation of volatile organics by gliding arc discharge plasma, so that readers can fully understand the degradation of volatile organics by gliding arc discharge plasma and provide theoretical basis for the industrial application of the degradation of volatile organics by gliding arc discharge plasma.

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Application of low temperature plasmas for restoration/conservation of archaeological objects

Cited by 8 publications

References 15 publications

Effects of atmospheric pressure plasma jet operating with DBD on Lavatera thuringiaca L. seeds’ germination

Effects of atmospheric pressure plasma jet operating with DBD on Lavatera thuringiaca L. seeds’ germination

Application of low-temperature plasma for the removal of copper chloride layers on bronze Wares

Decomposition of volatile organic compounds using gliding arc discharge plasma

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