Lichtenberg figures

Magnusson, C. Edward

doi:10.1109/jaiee.1928.6534946

Cited by 9 publications

(5 citation statements)

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“…We have observed similar features in our investigations of the DBD polymerisation of other small molecules 64 . We propose that these might be Lichtenberg figures that have formed due to the electrical current passing through the material 67 .…”

Section: Discussionmentioning

confidence: 98%

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Hartl

Michl

et al. 2022

Sci Rep

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This work reveals a versatile new method to produce films with antimicrobial properties that can also bond materials together with robust tensile adhesive strength. Specifically, we demonstrate the formation of coatings by using a dielectric barrier discharge (DBD) plasma to convert a liquid small-molecule precursor, m-cresol, to a solid film via plasma-assisted on-surface polymerisation. The films are quite appealing from a sustainability perspective: they are produced using a low-energy process and from a molecule produced in abundance as a by-product of coal tar processing. This process consumes only 1.5 Wh of electricity to create a 1 cm2 film, which is much lower than other methods commonly used for film deposition, such as chemical vapour deposition (CVD). Plasma treatments were performed in plain air without the need for any carrier or precursor gas, with a variety of exposure durations. By varying the plasma parameters, it is possible to modify both the adhesive property of the film, which is at a maximum at a 1 min plasma exposure, and the antimicrobial property of the film against Escherichia coli, which is at a maximum at a 30 s exposure.

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Section: Discussionmentioning

confidence: 98%

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Hartl

Michl

et al. 2022

Sci Rep

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“…When considering that 2H ? r p and combining (12) and (13), a relationship between E T and V T could be deduced as given in (14) as in the following:…”

Section: Electric Field Computationmentioning

confidence: 99%

“…Actually, the creeping discharges take place on some electrical components when being subjected to higher electric stresses, such as cable terminations, suspension insulators, piercing connectors or power capacitors, leading to partial or generalised deteriorations depending on weather conditions, the type of the material and the applied voltage [4][5][6][7][8]. More precisely, creeping discharges are known to occur after an excessive accumulation of space charges or when electrical apparatus are subjected to other constraints like switching or lightning impulse transients [9][10][11][12][13][14]. The shape of these discharges is similar to those observed by Lichtenberg and could be characterised by a fractal dimension that depends on geometrical and physical factors such as the dielectric thickness and its permittivity [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Creeping discharges features propagating in air at atmospheric pressure on various materials under positive lightning impulse voltage – part 2: modelling and computation of discharges’ parameters

Douar

Béroual

Souche³

2017

IET Generation, Transmission & Distribution

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“…Actually, the creeping discharges are likely to take place on the surface of insulating structures after an excessive accumulation of space charges [1,2] or when these structures are facing other constraints such as switching or lightning impulse waves [3][4][5][6][7][8][9]. The shape of these discharges is reminiscent of Lichtenberg figures and can be characterized by a fractal dimension that depends on both geometrical and physical factors [10]. Studies regarding discharges propagating over solid/air interfaces are less numerous comparatively to those available on the prebreakdown and breakdown phenomena in solids [11][12][13] or air alone [14].…”

Section: Introductionmentioning

confidence: 99%

Propagation of creeping discharges in air depending on the electric field direction and insulator materials under lightning impulse voltage

Douar¹,

Béroual²,

Souche³

2015

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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International audienceAbstract:This paper is devoted to the influence of the direction of the applied electric field (namely perpendicular and parallel to the insulator surface) and the type of insulator materials on the propagation of creeping discharges (pattern and stopping length) in presence of air under standard lightning impulse voltage. The investigated materials belong to two distinguished families among the mostly used in electrical industry: (i) thermoplastics (namely polyamide 6 and polyarylamide), and (ii) one cycloaliphatic filled epoxy resin. It is shown that the stopping discharges length on a solid/air interface covers generally 55% of the creeping distance for both polarities under perpendicular E-field right before the flashover. While with parallel E-field, the stopping length is included between 20 to 30% for positive polarity and less than 25% for negative polarity. Also, the application of a perpendicular E-field is more straitened than the tangential one due mainly to the dielectric constant of polymers. Numerical simulations show that the electric field is more reduced for perpendicular E-field inferring that discharges (streamers) lengthen and develop easily at lower voltage levels

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Lichtenberg figures

Cited by 9 publications

References 0 publications

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Creeping discharges features propagating in air at atmospheric pressure on various materials under positive lightning impulse voltage – part 2: modelling and computation of discharges’ parameters

Propagation of creeping discharges in air depending on the electric field direction and insulator materials under lightning impulse voltage

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