Bibliografías temáticas / Dielectric barrier discharges (DBD)

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Literatura académica sobre el tema "Dielectric barrier discharges (DBD)"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 8 de febrero de 2022

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Artículos de revistas sobre el tema "Dielectric barrier discharges (DBD)"

Dineff, Peter y Dilyana Gospodinova. "Electrode configurations and non-uniform dielectric barrier discharge properties". Facta universitatis - series: Electronics and Energetics 22, n.º 2 (2009): 217–26. http://dx.doi.org/10.2298/fuee0902217d.

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Interesting types of AC discharges in ambient air at atmospheric pressure for the generation of non-thermal plasma at/on dielectric surfaces were investigated. Pin-to-plane dielectric barrier discharge (PTP-DBD) was sustained in the electrode configurations combining electrode components of both corona and DBD - metallic pins, or triangle spikes electrode, situated single- or double-in-line and metallic plate electrode covered with a dielectric barrier. It was investigated experimentally and theoretically the burning mode of a PTP-DBD in ambient air at atmospheric pressure. The PTP-DBD behavior with single- or double-in-line spikes high voltage electrode was discussed. The PTP-DBD is a new DBD-based discharge. .

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Lee, Don Kyu. "Analysis of the Characteristics on Dielectric Barrier Discharges Depending on the Relative Permittivity and Frequency". Applied Mechanics and Materials 875 (enero de 2018): 113–16. http://dx.doi.org/10.4028/www.scientific.net/amm.875.113.

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Various studies are being conducted on the application of DBD (Dielectric barrier discharges). The internal dielectric has a very important characteristic on DBD, thus we analyze of the characteristics on dielectric barrier discharges depending on the relative permittivity and frequency. Through simulation, the discharge voltage was calculated based on relative permittivity and frequency of real used dielectrics (Green sheet, Down dielectric, white dielectric). We investigate that increased relative permittivity and fast frequency occur the decrease of the firing voltage. Also, we investigate the frequency dependence of the dielectric constant and dielectric loss of dielectric layers measured at a frequency region of 100Hz to 10MHz. In a condition of drive within 1MHz, with regard to the change of real and imaginary part according to frequency, it has quite stable dielectric constant in the condition of drive within 1MHz.

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Chirokov, A., A. Gutsol y A. Fridman. "Atmospheric pressure plasma of dielectric barrier discharges". Pure and Applied Chemistry 77, n.º 2 (1 de enero de 2005): 487–95. http://dx.doi.org/10.1351/pac200577020487.

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The dielectric barrier discharge (DBD) has a number of industrial applications and has been a subject of research for many years. Many studies have been carried out to understand the underlying DBD physics. Despite the fact that much progress has been made, some important issues are still far from being clear. In this work, we summarize the basics of DBD physics and introduce innovative concepts of discharge behavior that were discovered recently.

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Okazaki, Ken y Tomohiro Nozaki. "Ultrashort pulsed barrier discharges and applications". Pure and Applied Chemistry 74, n.º 3 (1 de enero de 2002): 447–52. http://dx.doi.org/10.1351/pac200274030447.

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Atmospheric pressure nonequilibrium plasmas have made a recent remarkable progress in formation techniques including atmospheric pressure glow discharge (APG), dielectric barrier discharge (DBD), corona discharge, surface discharge, ultrashort pulsed discharge, etc., and are expanding their applications into the field of energy and environment as well as material conversion processes. This paper will especially focus on a large improvement of DBD by combining it with squared ultrashort high voltage pulses and various applications.

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Sláma, Jan y Vítezslav Kríha. "INHIBITION OF CANDIDA ALBICANS GROWTH ON SURFACES TREATED BY DIELECTRIC BARRIER DISCHARGE WITH VARIOUS BARRIERS". Acta Polytechnica 54, n.º 4 (31 de agosto de 2014): 290–94. http://dx.doi.org/10.14311/ap.2014.54.0290.

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Discharges generating low temperature plasma at atmospheric pressure have the potential to treat surfaces biologically contaminated by organic matter in a non-destructive manner. We have been studying ways of inhibiting the growth of microorganisms with the use of dielectric barrier discharge (DBD) plasma. The effect of the choice of a barrier material and its thickness on the germicide properties of the DBD is described. We used Saboraud agar inoculated by 105 cfu/cm2 of Candida albicans yeast as the model contaminated surface. After cultivation, the proportion of the treated surface with no C. albicans colony was evaluated.

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JARDIM, C. M., R. C. OLIVEIRA, J. S. HSIEH, A. J. RAGAUSKAS y T. ELDER. "Eucalyptus fiber modification using dielectric-barrier discharge". TAPPI Journal 14, n.º 9 (1 de octubre de 2015): 585–91. http://dx.doi.org/10.32964/tj14.9.585.

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This study involves an investigation of the impact of the various levels of atmospheric dielectricbarrier discharge (DBD) treatment on the surface of eucalyptus fibers at different levels of beating with the objective of enhancing paper strength properties. The DBD treatment led to significant improvements in wet-strength tensile properties, increasing them by 2%-112%, as a function of the dosage of atmospheric plasma applied. Also, using controlled dosages of the DBD treatment, dry-strength tensile could be improved, reaching a 58% increase. In addition, non-beaten samples showed greater increases in strength properties than the beaten samples. Moreover, the acid surface content was unaltered by the DBD treatment, perhaps due to over-oxidation and generation of low molecular weight species that are easily removed by washing with water. Furthermore, increases in wettability could be observed for specific DBD dosage of treatments. Atomic force microscopy images of the treated handsheets showed that DBD treatment results in surface smoothing of the fibers. In conclusion, DBD treatment was shown tobe an effective approach for eucalyptus fiber modification, especially in terms of enhancement of wet-strength properties.

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Žigon, Jure, Marko Petrič y Sebastian Dahle. "Dielectric barrier discharge (DBD) plasma pretreatment of lignocellulosic materials in air at atmospheric pressure for their improved wettability: a literature review". Holzforschung 72, n.º 11 (27 de noviembre de 2018): 979–91. http://dx.doi.org/10.1515/hf-2017-0207.

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AbstractThe treatment of wood surfaces with gas discharges is one of the methods to achieve better surface adhesion properties. Good penetration, spreading and wettability of the applied liquid adhesives and coatings is a crucial factor for their adequate mechanical properties. Plasmas are the result of electrical discharge and can be created in different ways. The plasma treatment (PT) is frequently executed prior to material bonding or coating via the so-called dielectric barrier discharges (DBD) at atmospheric pressure. This literature review summarizes the essential aspects of DBD PTs aiming at a better wettability and surface adhesion. After introduction of the principle of DBD, the individual effects of internal and external parameters of the process will be discussed, which influence the final properties of treated materials.

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Dilecce, Giorgio, Paolo F. Ambrico y Santolo De Benedictis. "Optical diagnostics in dielectric barrier discharges at atmospheric pressure". Pure and Applied Chemistry 82, n.º 6 (20 de abril de 2010): 1201–7. http://dx.doi.org/10.1351/pac-con-09-08-19.

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Our recent work on optical emission spectroscopy (OES) and laser-induced fluorescence (LIF) applied to dielectric barrier discharge (DBD) at atmospheric pressure (ATP) is reported. The interplay of discharge kinetics and diagnostic techniques features is evidenced, with emphasis on collision processes that, with their variety of state-to-state characteristics and rate constants, determine the observation of a peculiar collision-dominated non-equilibrium system.

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Thapa, Bhesh Bahadur y Raju Bhai Tyata. "Study of Dielectric Barrier Discharge in Air and Estimation of Electron Density and Energy Deposition". Journal of Science and Engineering 7 (20 de diciembre de 2019): 1–9. http://dx.doi.org/10.3126/jsce.v7i0.26780.

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This paper reports the electrical behaviors of atmospheric pressure plasma reactor with Dielectric Barrier Discharge (DBD) in air medium. The DBD discharge was generated in air at atmospheric pressure using Disc Electrode Geometry (DEG) reactor powered by ac voltage (0-7kV) at a frequency of 24kHz. The glass plates of thickness 1.0mm and 3.0mm were used as dielectric. The current-voltage characteristics were studied for two air gap of 2.0mm and 3.0mm by varying the applied voltages. The numbers of filamentary micro discharges were found as increased in each half cycle with increase in power. The observations of Lissajous figure of applied voltage versus electric current was used for measuring energy deposited by discharge and also compared with calculated value. Lissajous figures clearly show that the energy deposited by discharge was dependent on applied voltage. The electron density of discharge was measured by power balance method. Electron density was found in the order of 1017 per cubic meter.

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Balasubramanian, Manjula, Anita Sebastian, Marie Peddinghaus, Gregory Fridman, Alexander Fridman, Alexander Gutsol, Gregory Friedman y Brooks Ari. "Dielectric Barrier Discharge Plasma in Coagulation and Sterilization." Blood 108, n.º 11 (16 de noviembre de 2006): 4043. http://dx.doi.org/10.1182/blood.v108.11.4043.4043.

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Abstract Rapid loss of blood, in the operating room or trauma, necessitates a need for hastening coagulation Attempts to hasten coagulation include electrocautery based on thermal plasma discharges. Although there have been other effective attempts to prevent further loss of blood via coagulation, tissue damage and dessication can occur as a result of the high temperatures 2. Our group has developed a method to initiate rapid coagulation with dielectric plasma discharge (cold). Initial experiments were performed using fresh blood from volunteers to compare time for coagulation of whole blood exposed to plasma, one minute versus 10 minutes. We tried same experiments on cut cadaver organs such as spleen and placenta which showed evidence of rapid coagulation compared to control without evidence of tissue damage. Our research team has developed a novel method using non-thermal dielectric barrier discharge plasma (DBD plasma) to coagulate blood and sterilize tissues without causing thermal damage. This treatment would be safe to patients because no exposed electrodes are involved and high frequency current (under 10 KHz) is kept below mili-ampere. Our experiments have shown that such plasma treatment hastens blood coagulation and causes simultaneous wound sterilization via a large concentration of chemically active species in plasma that are ions, radicals (O, OH, N) and electronically-excited atoms and molecules. A kinetic model of blood coagulation under influence of DBD plasma was constructed. The model assumes contact flux of positive ions from DBD plasma into the surface of the blood being treated. Once at the surface, these ions recombine, leading to formation of aqueous Hydrogen ions which catalyze the release of Calcium ions into the blood. The addition of Calcium ions to blood speeds up the coagulation process proportionally to the amount of ions added. The model demonstrates thrombin formation in the presence of DBD plasma peaking and occurring within significantly less time compared to thrombin formation without DBD plasma3. Such medically relevant demonstrations and mathematical explanations have allowed us to develop a portable device that may prove useful in situations where control of bleeding is crucial. In addition, because of the potential for simultaneous sterilization, this device may also help to decrease infections. This pioneering technology will find applicability in many clinical situations: sterilization of human tissue surfaces prior to surgery and sterilization of catheters, a well-known cause of morbidity in hospitals.

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Tesis sobre el tema "Dielectric barrier discharges (DBD)"

Droubi, Ashraf El. "Investigation of the efficiency of a novel three electrode configuration for the dielectric barrier discharge". Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-03102018-144641/.

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Having gained popularity in the last decade, the dielectric barrier discharge (DBD) has been studied in numerous ways as a device for air acceleration. A major interest of all these works has been concentrated on achieving higher efficiency and producing higher jet velocities. These studies considered alternative geometries, different voltage waveforms etc., yet none of these studies tackle the inherently inefficient process of force creation and actuation in a DBD. Air acceleration has been attributed to the electric force that switches direction on each voltage half cycle (that is due to the nature of the discharge mechanism) yet has a forward resulting force. The present thesis considers the phenomenon of memory charge accumulation on the dielectric surface and reasons that the backward force in the second half cycle can be reversed by further migration of the memory charges to an added exposed anode. Hence a novel 3-electrode configuration is presented. Flow velocity investigations showed a 27% improvement in efficiency in comparison with the traditional 2-electrode actuator. This meant a 0.4m/s gain along the velocity profile. During the investigation process, a new discharge mechanism was encountered. This was characterized by the double discharge lines along the exposed electrode edges while in the presence of a \"floating\" encapsulated electrode.
Tendo ganho popularidade na última década, a descarga de barreira dielétrica (DBD) foi estudada de várias maneiras como um dispositivo para aceleração do ar e controle aerodinâmico. Um grande interesse de todos esses trabalhos foi concentrado em alcançar maior eficiência e produzir maiores velocidades de jato. Alguns desses estudos consideraram geometrias alternativas, diferentes formas de onda de tensão, etc., mas nenhum desses estudos aborda o processo inerentemente ineficiente de criação e atuação da força em um DBD. A Aceleração do ar tem sido atribuída à força elétrica que muda de direção em cada meio ciclo (que é devido à natureza do mecanismo de descarga), mas que tem uma força resultante para a frente. A presente tese considera o fenômeno de acumulação de carga de memória na superfície dielétrica e raciocina que a força contraria no segundo meio ciclo da descarga pode ser revertida por migração dessas cargas de memória para um ânodo adicional exposto. Assim, uma nova configuração de 3 eletrodos é apresentada. Investigações de velocidade do fluxo mostraram uma melhoria de 27% na eficiência em comparação com o tradicional atuador de 2 eletrodos. Isso significou um ganho de 0,3 m/s ao longo do perfil de velocidade. Durante o processo de investigação, foi encontrado um novo mecanismo de descarga. Isso foi caracterizado por uma dupla descarga ao longo das bordas do eletrodos expostos, enquanto na presença de um eletrodo encapsulado \"pendurado\".

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Stanfield, Scott Alan II. "A SPECTROSCOPIC INVESTIGATION OF A SURFACE-DISCHARGE-MODE, DIELECTRIC BARRIER DISCHARGE". Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1261582116.

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Elam, Dana. "A direct numerical simulation of dielectric barrier discharge (DBD) plasma actuators for turbulent skin-friction control". Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/49964/.

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Turbulent skin-friction control is the subject of much research and the use of transverse (spanwise) oscillating motions offers the means of obtaining a significant reduction in skin-friction. Dielectric barrier discharge (DBD) actuators can be used to generate spanwise oscillating waves but the difficulty in placing a sensor in the area of plasma gives rise to problems in recording near-wall velocities. A modified version of the Shyy et al. (2002) DBD model was integrated into a direct numerical simulation (DNS). This numerical model was used in a series of two-dimensional simulations, in initially quiescent ow, and the results were compared to results reported from experimental investigations. A close affinity was found confirming that the DBD model is satisfactory. Both a temporal and a spatial, spanwise oscillating ow were investigated. Only one plasma profile was investigated. Three actuator spacings were investigated. Only the largest actuator spacing resulted in a gap between each plasma profile that was larger than the plasma profile width itself. A spatially uniform plasma configuration produced larger DR% than spanwise wall oscillation for both spatial and temporal waves, maximum DR = 51% compared to a DR = 47% for a spanwise wall oscillation. Increased skin-friction reductions originated from the displacement of the Stokes layer. The spatial wave produced lower skin-friction values than temporal waves for all the configurations. For both spatial and temporal waves the performance of the discrete configurations in producing an overall skin-friction reduction decreased with increasing actuator spacing. Using both temporal and spatial waves, the configuration with the largest spacing, which is relatively small, did not produce a drag reduction for any case that was tested.

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Lovascio, Sara. "Cold Plasma deposition of organosilicon films with different monomers in a dielectric-barrier discharge". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00815260.

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Cette thèse porte sur une étude fondamentale sur le dépôt des couches minces d'organosiliciés par des Décharges à Barrière Diélectrique (DBD), un procédé très intéressant pour l'application aux textiles. La plupart des dépôts des couches d'oxyde de silicium sont déposées à partir du précurseur hexaméthyle silixone (HMDSO).De plus très peu d'études sont consacrées aux mécanismes de dépôt des couches à la pression atmosphérique. Dans cette étude les propriétés des couches minces déposées par DBD alimentées par Ar/HMDSO/O2, Ar/PMDSO (pentaméthyldisiloxane)/O2 et Ar/TMDSO (tetraméthyldisiloxane)/O2, avec différentes proportions de l'oxygène, ont été confrontées aux analyses, par GC-MS, des gaz sortant du réacteur. Nous avons trouvé que l'ajout d'O2 au gaz d'alimentation n'améliore pas l'activation du précurseur organosilicié, même s'il augmente la puissance injectée. En revanche il influence fortement la composition chimique des dépôts et favorise une forte réduction de la concentration des sous-produits dans le gaz sortant du réacteur. Sans ajout de l'O2, des couches minces obtenues contiennent beaucoup de carbone , avec rétention de la structure du précurseur de départ. En réduisant le nombre de -CH3 dans le précurseur (HMDSO>PMDSO>TMDSO), le nombre et l'abondance des sous-produits détectés dans le gaz sortant du réacteur diminuent fortement. Il semblerait que les unités de répétition diméthylsiloxane et hydrométhylsiloxane jouent un rôle important dans l'oligomérisation des trois précurseurs. Différents mécanismes d'activation, ainsi que différents procédés de formation des groupes Si-OH dans les dépôts, ont été proposés pour les trois précurseurs.

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Santos, Alessandro Luiz Ribeiro dos [UNESP]. "Estudo de polímeros comerciais tratados a plasma em pressão atmosférica". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/91830.

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Made available in DSpace on 2014-06-11T19:25:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-02-08Bitstream added on 2014-06-13T20:14:00Z : No. of bitstreams: 1 santos_alr_me_guara.pdf: 967831 bytes, checksum: 8cbbf37b87afd6e4a7c7ecc3380f9ebf (MD5)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Materiais poliméricos têm sido amplamente utilizados em várias áreas tecnológicas e biomédicas, devido às suas excelentes propriedades mecânicas, térmicas e elétricas. No entanto, estes materiais têm baixa energia de superfície e, portanto, não aderem facilmente a outros materiais. Por isso, para muitas aplicações é necessário modificar a superfície do polímero, a fim de aumentar a sua energia de superfície. Tratamentos a plasma à pressão atmosférica têm sido muito utilizados para modificar as propriedades superficiais de polímeros comerciais, devido aos baixos custos do processo. Este trabalho apresenta os resultados do tratamento de tereftalato de polietileno (PET), poliuretano (PU) e de politetrafluoretileno (PTFE) em plasma de descargas com barreira dielétrica (DBD) em ar, nitrogênio e argônio, à pressão atmosférica. As superfícies tratadas foram caracterizadas por medidas de ângulo de contato, espectroscopia de fotoelétrons de raios-X (XPS) e microscopia de força atômica (AFM). A superfície polimérica, modificada nas DBD a pressão atmosférica, mostraram uma redução significativa no ângulo de contato da água, embora uma recuperação parcial da molhabilidade ocorresse nos primeiros dias após o tratamento. Todavia, a recuperação foi insuficiente para que as amostras tratadas recuperassem a sua molhabilidade original. Análises de XPS mostraram um aumento na concentração de oxigênio na superfície, devido à formação de grupos polares, tais como C-O e OC= O. Um pequeno aumento na concentração de nitrogênio também foi observada. Imagens de AFM mostraram um aumento da rugosidade de polímeros tratados, decorrentes da interação física entre as espécies geradas na descarga e a superfície do polímero. A superfície ativada e a elevada tensão superficial dos polímeros tratados devem levar a um aumento da aderência do polímero.
Polymeric materials have been widely used in various biomedical and technological applications, due to their excellent mechanical, thermal and electric properties. However, these materials have low surface energy, and thus not easily adhere to other materials. Therefore, for many applications it is necessary to modify the polymer surface in order to increase its surface energy. Plasma treatments at atmospheric pressure have been frequently used to modify the surface properties of commercial polymers, due to their low process costs. This work reports the results of polyethylene terephthalate (PET), polyurethane (PU) and polytetrafluoroethylene (PTFE) treatments in plasma by dielectric barrier discharges (DBDs) in air, nitrogen and argon at atmospheric pressure. The plasma-modified surfaces were characterized by contact angle measurements, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The polymer surface, modified by DBD at atmospheric pressure, showed a significant decrease in water contact angle although a partial recovery of the surface wettability occurred during the first few days after the treatment. However, the process of hydrophobic recovery was insufficient for complete recovering of the samples original wettability. XPS analysis showed an increase of the oxygen concentration on the surface, due to the formation of polar groups, such as C-O and OC= O. A small increase in the concentration of nitrogen was also observed. AFM images exhibit an increased roughness of the treated polymers because of the physical interaction between the species generated in the discharge and the polymer surface. The activated surface and high surface tension of treated polymers should promote an enhancement of the polymer adhesion to paints and coatings.

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Rampa, Federico. "Trattamento plasma assistito di acqua con una sorgente Dielectric Barrier Discharge (DBD): analisi delle specie reattive prodotte e potere battericida". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11812/.

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La proliferazione di batteri in liquido è una problematica che riguarda anche le acque di fiumi e mari. In questo progetto di tesi sperimentale si indagherà un trattamento plasma assistito diretto di acqua sintetica riprodotta in laboratorio con l’obiettivo di ottenere un effetto battericida sul liquido contaminato. L’acqua trattata verrà analizzata chimicamente, in particolare si andranno a misurare i TRO (Total Residual Oxidant, composti dell’ossigeno derivanti dalla parziale ozonizzazione dell’acqua) che dovranno essere presenti in quantità minori di 0,1 mg/l. Il dispositivo utilizzato per i test biologici è una sorgente di tipologia DBD (Dielectric Barrier Discharge) indiretto. Gli elettrodi della sorgente sono separati dal solo strato di materiale dielettrico e uno di questi è composto da una rete metallica in acciaio inossidabile. Il plasma si forma tra le maglie della rete e induce la formazione di specie reattive, radiazioni UV, particelle cariche, campi elettromagnetici e calore. Ciò che raggiunge la soluzione contaminata è l’afterglow del plasma, ovvero tutte le specie reattive a lunga vita prodotte dalla ionizzazione dell’aria e dalle radiazioni UV. La sorgente è stata dapprima caratterizzata elettricamente studiando le forme d’onda di tensione e corrente a determinate condizioni operative. Il liquido da trattare è contaminato con il batterio Escherichia coli. è emerso che in tutti i casi testati i livelli degli ossidanti sono entro il limite prestabilito di 0,1 mg/l. Il trattamento plasma in soli 10 secondi è responsabile di una decontaminazione parziale del batterio E. coli. Da ulteriori studi si potranno trovare delle condizioni tali da inattivare totalmente la carica batterica presente date le grandi potenzialità di questo trattamento.

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Santos, Alessandro Luiz Ribeiro dos. "Estudo de polímeros comerciais tratados a plasma em pressão atmosférica /". Guaratinguetá : [s.n.], 2010. http://hdl.handle.net/11449/91830.

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Resumo: Materiais poliméricos têm sido amplamente utilizados em várias áreas tecnológicas e biomédicas, devido às suas excelentes propriedades mecânicas, térmicas e elétricas. No entanto, estes materiais têm baixa energia de superfície e, portanto, não aderem facilmente a outros materiais. Por isso, para muitas aplicações é necessário modificar a superfície do polímero, a fim de aumentar a sua energia de superfície. Tratamentos a plasma à pressão atmosférica têm sido muito utilizados para modificar as propriedades superficiais de polímeros comerciais, devido aos baixos custos do processo. Este trabalho apresenta os resultados do tratamento de tereftalato de polietileno (PET), poliuretano (PU) e de politetrafluoretileno (PTFE) em plasma de descargas com barreira dielétrica (DBD) em ar, nitrogênio e argônio, à pressão atmosférica. As superfícies tratadas foram caracterizadas por medidas de ângulo de contato, espectroscopia de fotoelétrons de raios-X (XPS) e microscopia de força atômica (AFM). A superfície polimérica, modificada nas DBD a pressão atmosférica, mostraram uma redução significativa no ângulo de contato da água, embora uma recuperação parcial da molhabilidade ocorresse nos primeiros dias após o tratamento. Todavia, a recuperação foi insuficiente para que as amostras tratadas recuperassem a sua molhabilidade original. Análises de XPS mostraram um aumento na concentração de oxigênio na superfície, devido à formação de grupos polares, tais como C-O e OC= O. Um pequeno aumento na concentração de nitrogênio também foi observada. Imagens de AFM mostraram um aumento da rugosidade de polímeros tratados, decorrentes da interação física entre as espécies geradas na descarga e a superfície do polímero. A superfície ativada e a elevada tensão superficial dos polímeros tratados devem levar a um aumento da aderência do polímero.
Abstract: Polymeric materials have been widely used in various biomedical and technological applications, due to their excellent mechanical, thermal and electric properties. However, these materials have low surface energy, and thus not easily adhere to other materials. Therefore, for many applications it is necessary to modify the polymer surface in order to increase its surface energy. Plasma treatments at atmospheric pressure have been frequently used to modify the surface properties of commercial polymers, due to their low process costs. This work reports the results of polyethylene terephthalate (PET), polyurethane (PU) and polytetrafluoroethylene (PTFE) treatments in plasma by dielectric barrier discharges (DBDs) in air, nitrogen and argon at atmospheric pressure. The plasma-modified surfaces were characterized by contact angle measurements, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The polymer surface, modified by DBD at atmospheric pressure, showed a significant decrease in water contact angle although a partial recovery of the surface wettability occurred during the first few days after the treatment. However, the process of hydrophobic recovery was insufficient for complete recovering of the samples original wettability. XPS analysis showed an increase of the oxygen concentration on the surface, due to the formation of polar groups, such as C-O and OC= O. A small increase in the concentration of nitrogen was also observed. AFM images exhibit an increased roughness of the treated polymers because of the physical interaction between the species generated in the discharge and the polymer surface. The activated surface and high surface tension of treated polymers should promote an enhancement of the polymer adhesion to paints and coatings.
Orientador: Konstantin Georgiev Kostov
Coorientador: Roberto Yzumi Honda
Banca: Konstantin Georgiev Kostov
Banca: Rogério Pinto Mota
Banca: Gilberto Petraconi Filho
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McElligott, Kristine L. "Control of flow separation from the deflected flap of a high-lift airfoil using multiple dielectric barrier discharge (DBD) plasma actuators". Connect to resource, 2010. http://hdl.handle.net/1811/45388.

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Diop, Mame Andallah. "Alimentation sans transformateur pour dispositif de décharge à barrière diélectrique (DBD)". Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30092/document.

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Cette thèse porte sur le développement d'une structure d'alimentation sans transformateur pour des décharges à barrière diélectrique (DBD). Une DBD est une charge permettant d'obtenir des plasmas froids à la pression atmosphérique. Ce dispositif est fortement capacitif et son alimentation doit délivrer plusieurs kilovolts pour allumer et entretenir la décharge. Cette haute tension est classiquement obtenue à l'aide d'un transformateur élévateur. Dans une première partie, nous montrons que les éléments parasites du transformateur impactent fortement le transfert d'énergie vers la décharge. C'est pourquoi dans une seconde partie, nous proposons une nouvelle topologie d'alimentation sans transformateur élévateur. Les caractéristiques fondamentales et le dimensionnement de notre alimentation sont obtenus par une analyse théorique. Dans cette topologie, les interrupteurs sont directement connectés à la DBD ; ils doivent donc supporter des tensions de plusieurs kilovolts. Il y a encore quelques années, il n'existait pas de semi-conducteur capable de supporter ce niveau de tension, à moins d'utiliser des interrupteurs fonctionnant à très basse fréquence. De récents progrès sur les matériaux semi-conducteurs ont permis d'élaborer des transistors et des diodes à base de carbure de silicium (SiC) capables de supporter des tensions allant jusqu'à 10 kV. Ce niveau de tension est tout à fait compatible avec la topologie d'alimentation proposée ici.Nous consacrerons la troisième partie du manuscrit à la mise en œuvre de notre convertisseur. Ce dernier, conçu à base de semi-conducteurs SiC, est fonctionnel et permet d'allumer une décharge. Cependant le fonctionnement initialement prévu est fortement affecté par la présence des capacités parasites notamment celles des interrupteurs. Nous détaillerons le rôle de chacune d'entre elles. Nous proposerons enfin des solutions permettant d'améliorer le transfert de puissance : mise en série de semi-conducteurs basses tensions, utilisation sur DBD de forte puissance
This thesis focuses on the development of a dielectric barrier discharge (DBD) transformerless power supply. A DBD can produce cold plasma at atmospheric pressure. This device is a capacitive load, which must be supplied by a high voltage alternative source. This high voltage is classically obtained by amplifying a low level voltage with a step up transformer. In the first part, we show that the parasitic elements of the transformer limit the power transfer to the DBD load. This is why, in a second part, we propose a new topology without step-up transformer. A theoretical study of the converter allows to size our power supply and to deduce the fundamental characteristics of the latter. In our topology, the power switches are directly connected to the high voltage. A few years ago, it was inconceivable to connect directly a transistor to a high level of voltage (5kV), unless using very low frequency switches. Recent progress on semiconductor devices led to the development of transistors and diodes based on silicon carbide (SiC), which are able to hold up to 10kV. This voltage level is compatible with our topology.In the third part, we focus on the realization of our transformerless power supply and its operation. Our power supply based on 10 kV SiC semiconductors can ignite the discharge; however the parasitic capacitance and particularly those of the switches affect the power transfer. The role of each one of them is analyzed in detail.In the last part we propose solutions to improve the power delivered by this supply: series connection of lower voltage switches, supplying a high power DBD

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Chhatiawala, Nihar H. "Case Study: The Commercial Potential of Dielectric Barrier Discharge Plasma Actuators for Active Flow Control in Wind Turbines". Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1536947431190003.

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Capítulos de libros sobre el tema "Dielectric barrier discharges (DBD)"

Subedi, Deepak Prasad, Ujjwal Man Joshi y Chiow San Wong. "Dielectric Barrier Discharge (DBD) Plasmas and Their Applications". En Plasma Science and Technology for Emerging Economies, 693–737. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4217-1_13.

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Snehal, U. M., Mohammed Ibrahim y G. Jagadeesh. "Effect of Dielectric Barrier Discharge Plasma Actuator (DBD-PA) on Boundary Layer Separation Control in Hypersonic Flows". En 31st International Symposium on Shock Waves 1, 1105–12. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91020-8_133.

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Kogelschatz, U. "UV Production in Dielectric Barrier Discharges for Pollution Control". En Non-Thermal Plasma Techniques for Pollution Control, 339–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_24.

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Zhang, Yue-ping, Yang Li, Chang-jun Liu y Baldur Eliasson. "Influence of Electrode Configuration on Direct Methane Conversion with CO2as a Co-Reactant Using Dielectric-Barrier Discharges". En ACS Symposium Series, 100–115. Washington, DC: American Chemical Society, 2003. http://dx.doi.org/10.1021/bk-2003-0852.ch006.

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"Dielectric Barrier Discharge (DBD)". En Encyclopedia of Plasma Technology, 355–66. CRC Press, 2016. http://dx.doi.org/10.1081/e-eplt-120050797.

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Bibinov, Nikita, Priyadarshini Rajasekaran, Philipp Mertmann Dirk Wandke, Wolfgang Vil y Peter Awakowicz. "Basics and Biomedical Applications of Dielectric Barrier Discharge (DBD)". En Biomedical Engineering, Trends in Materials Science. InTech, 2011. http://dx.doi.org/10.5772/13192.

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"Modification of Sugar Maple (Acer saccharum) and Black Spruce (Picea mariana) Wood Surfaces in a Dielectric Barrier Discharge (DBD) at Atmospheric Pressure". En Wood Adhesives, 45–58. CRC Press, 2011. http://dx.doi.org/10.1201/b12180-6.

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Peeters, Floran y Tom Butterworth. "Electrical Diagnostics of Dielectric Barrier Discharges". En Atmospheric Pressure Plasma - from Diagnostics to Applications. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.80433.

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Egli, W., J. M. Favre y B. Eliasson. "Numerical results of microdischarge formation in dielectric-barrier discharges for CO2 recycling". En Greenhouse Gas Control Technologies 4, 1099–101. Elsevier, 1999. http://dx.doi.org/10.1016/b978-008043018-8/50180-6.

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Wang, Jian-guo, Chang-jun Liu y Baldur Eliassion. "A Feasibility Study of Synthesis of Oxygenates Directly from Methane and Carbon Dioxide Using Dielectric-barrier Discharges". En Carbon Dioxide Utilization for Global Sustainability, Proceedings of 7ththe International Conference on Carbon Dioxide Utilization, 109–18. Elsevier, 2004. http://dx.doi.org/10.1016/s0167-2991(04)80228-3.

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Actas de conferencias sobre el tema "Dielectric barrier discharges (DBD)"

Baird, Corrie, C. Enloe, Thomas McLaughlin y James Baughn. "Acoustic Testing of the dielectric barrier discharge (DBD) plasma actuator". En 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-565.

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Ghassemi, Mona, Hossein Mohseni, Kaveh Niayesh y Amir Abbas Shayegani. "Dielectric Barrier Discharge (DBD) dynamic modeling for high voltage insulation". En 2011 Electrical Insulation Conference (EIC) (Formerly EIC/EME). IEEE, 2011. http://dx.doi.org/10.1109/eic.2011.5996137.

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Shan, Hua y Yu-Tai Lee. "Numerical Study of Dielectric Barrier Discharge Plasma Actuation". En ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21108.

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There has been an increasing interest in dielectric barrier discharge (DBD) plasma actuation for flow control in the past decade. Compared to other means of active flow controls, the DBD plasma actuations have several advantages, including absence of moving parts, a fast time response for unsteady applications, a very low mass of the device, no cavities or holes on control surfaces, and possibly low energy consumption. These features are especially important for applications with high g-loads, such as turbomachinery blades rotating at high speed. A computational method has been developed to couple a DBD electro-hydrodynamic (EHD) body force model with the Reynolds averaged Navier-Stokes (RANS) model for incompressible flows. The EHD body force model is based on solving the electrostatic equations for the electric potential due to applied voltage and the net charge density due to ionized air. The boundary condition for charge density on the dielectric surface is obtained from a Space-Time Lumped-Element (STLE) circuit model that accounts for time and space dependence of the air ionization on the input voltage amplitude, frequency, electrode geometry, and dielectric properties. Alternatively, an empirical formulation representing a Gaussian distribution of charge density on the dielectric surface can also be used. The EHD body force is calculated using the solutions obtained from solving the electric potential and the net charge density equations. As a comparison, a much simpler Linearized Electric Body Force (LEBF) model is also used to directly specify the spatial distribution of the averaged EHD body force. The coupled computational models have been implemented using a multiple-domain approach. The electric potential equation, the net charge density equation, and the flow equations are solved in separate computational domains. All equations are discretized in space using a cell-centered finite volume method. Parallel computation is implemented using domain-decomposition and message passing interface (MPI). Due to a large disparity in time scales between the electric discharge and the flow, a multiple sub-cycle technique is used in coupling the plasma solver and the flow solver. The DBD plasma induced flow in quiescent air is used as a test case and the computational results are validated against experimental measurement. A comparison between different EHD body force models is also presented. Then, the effect of driving duty-cycles with different waveforms and input voltage amplitudes is investigated in terms of electrical power, EHD thrust, and kinetic energy of induced flow.

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Rodrigues, F. F., J. C. Pascoa y M. Trancossi. "Experimental Analysis of Alternative Dielectric Materials for DBD Plasma Actuators". En ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87455.

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Dielectric Barrier Discharge plasma actuators are simple devices with great potential for active flow control applications. They have very interesting features which have made them a topic of interest for many researchers, for instance they present very low mass, fast response time, low cost, easy implementation and they are fully electronic with no moving parts. The dielectric material used in the construction of these devices present an important role in their performance. The variety of dielectrics studied in the literature is very restrict and the majority of the authors make use of Kapton, Teflon, Macor ceramic or PMMA. Furthermore, several authors reported difficulties in the durability of the dielectric layer when actuators operate at high levels of voltage and frequency. Considering this background, the present study focus on the experimental testing of alternative dielectric materials which can be used for DBD plasma actuators fabrication. Considering this, plasma actuators with dielectric layers made of Poly-Isobutylene rubber, Poly-Lactic acid and Acetoxy Silicon were experimentally tested. Although these dielectric materials are not commonly used in plasma actuators, their values of dielectric strength and dielectric permittivity indicate they can be good solutions. The plasma actuators facbricated with these alternative dielectric materials were experimentally analysed in terms of electrical characteristics and induced flow velocity, and the obtained results were compared with an actuator made of Kapton which is, currently, the most common dielectric material for plasma actuators. The effectiveness of the actuators was estimated and the advantages and disadvantages of the use of each dielectric material were discussed.

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Pal, U. N., J. S. Soni, Sonu Kr, M. Kumar, A. K. Sharma y K. Frank. "Discharge analysis and electrical modeling of a coaxial dielectric barrier discharge (DBD) lamp". En 2008 IEEE 35th International Conference on Plasma Science (ICOPS). IEEE, 2008. http://dx.doi.org/10.1109/plasma.2008.4590905.

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Subedi, D. P., R. B. Tyata, R. Shrestha y C. S. Wong. "An experimental study of atmospheric pressure dielectric barrier discharge (DBD) in argon". En FRONTIERS IN PHYSICS: 4th International Meeting. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4867673.

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Tran, N. Dam y Nob Harada. "Developing of Aging Wine Model by Dielectric Barrier Discharge (DBD) at Atmospheric Pressure". En 2018 4th International Conference on Green Technology and Sustainable Development (GTSD). IEEE, 2018. http://dx.doi.org/10.1109/gtsd.2018.8595540.

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Ghaisani, Annisa Dinan, Aufara Mahayum, Kusumandari Kusumandari y Teguh Endah Saraswati. "Degradation of dyes in textile industry wastewater using dielectric barrier discharge (DBD) plasma". En THE 4TH INTERNATIONAL CONFERENCE ON INDUSTRIAL, MECHANICAL, ELECTRICAL, AND CHEMICAL ENGINEERING. Author(s), 2019. http://dx.doi.org/10.1063/1.5098272.

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Salimi Meidanshahi, Fatemeh, Khosro Madanipour, Babak Shokri, Mohammad Reza Khani y Hamid Razavi Borzoki. "Measurement of plasma parameter in Dielectric Barrier Discharge (DBD) by Moiré deflectometry technique". En SPIE Optical Metrology, editado por Peter Lehmann, Wolfgang Osten y Armando Albertazzi Gonçalves. SPIE, 2015. http://dx.doi.org/10.1117/12.2184853.

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Taylan, Onur y Halil Berberoglu. "Discharge of Carbon Dioxide Using a Non-Thermal Plasma Reactor". En ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17559.

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This paper reports a numerical study on the discharge of carbon dioxide using a non-thermal dielectric barrier discharge (DBD) plasma reactor at ambient conditions. DBD plasma reactors have been used for various applications due to their ease of production, process control, operation at different conditions. The applications of DBD plasma reactors include discharge of gases. Carbon dioxide is a greenhouse gas formed as a byproduct of fossil fuel combustion. Use of DBD non-thermal plasma reactor can be a promising technology for carbon dioxide mitigation due to its operation at low temperatures, lack of need for catalysts, and flexibility in controlling the products generated. In this study, a tubular DBD non-thermal plasma reactor was modeled with different electrode materials separated by different dielectric materials. The aim was to provide guidelines for the design and material selection for optimizing DBD plasma reactors for CO2 discharge. A parametric set of simulations was performed using a finite element solver to investigate how electrode and dielectric materials affect the discharge volume of CO2 and power requirement of the non-thermal plasma discharge of CO2. The results showed that electrode material did not affect the discharge or the power requirement. However, dielectric material with higher permittivity or lower conductivity increased the gas discharge and power requirement. Among the analyzed materials, aluminum electrode and mica tube were suggested based on the simulation results for the maximum gas discharge and low power requirement.

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Informes sobre el tema "Dielectric barrier discharges (DBD)"

Estevadeordal, Jordi y Sivaram Gogineni. Low-Speed Flow Control Using Dielectric Barrier Discharge (DBD). Fort Belvoir, VA: Defense Technical Information Center, diciembre de 2006. http://dx.doi.org/10.21236/ada463519.

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Underwood, Thomas C. Development of a Lumped Element Circuit Model for Approximation of Dielectric Barrier Discharges. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2011. http://dx.doi.org/10.21236/ada558393.

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