Measurements of electrostatic potentials and electric fields in some industrial applications: Basic principles

Llovera, P.; Molinié, Philippe; Soria, Anabel; Quijano, Alfredo

doi:10.1016/j.elstat.2009.01.004

Cited by 47 publications

(26 citation statements)

References 7 publications

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“…The plasma treatment is expected to affect other surface properties such as surface potential of the treated material. For dielectric materials this can be associated with surface charge [35] , [36] . However, the effect of such treatments on the surface potential and consequently surface charge have not been studied, in particular, in conjunction with adhesion and attachment of subsequent layers such as dust and regolith.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Plasma Treatments on the Adhesion of Mars JSC 1 Simulant Dust to RTV 655, RTV 615, and Sylgard 184

et al. 2012

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BackgroundDust accumulation on surfaces of critical instruments has been a major concern during lunar and Mars missions. Operation of instruments such as solar panels, chromatic calibration targets, as well as Extra Vehicular Activity (EVA) suits has been severely compromised in the past as a result of dust accumulation and adhesion. Wind storms with wind speeds of up to 70 mph have not been effective in removing significant amounts of the deposited dust. This is indeed an indication of the strength of the adhesion force(s) involved between the dust particles and the surface(s) that they have adhered to. Complications associated with dust accumulation are more severe for non-conducting surfaces and have been the focus of this work.MethodologyArgon plasma treatment was investigated as a mechanism for lowering dust accumulation on non-conducting polymeric surfaces. Polymers chosen for this study include a popular variety of silicones routinely used for space and terrestrial applications namely RTV 655, RTV 615, and Sylgard 184. Surface properties including wettability, surface potential, and surface charge density were compared before and after plasma treatment and under different storage conditions. Effect of ultraviolet radiation on RTV 655 was also investigated and compared with the effect of Ar plasma treatment.Conclusion/SignificanceGravimetric measurements proved Ar plasma treatment to be an effective method for eliminating dust adhesion to all three polymers after short periods of exposure. No physical damage was detected on any of the polymer surfaces after Ar plasma treatment. The surface potential of all three polymers remained zero up to three months post plasma exposure. Ultraviolet radiation however was not effective in reducing surface and caused damage and significant discoloration to RTV 655. Therefore, Ar plasma treatment can be an effective and non-destructive method for treating insulating polymeric surfaces in order to eliminate dust adhesion and accumulation.

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Section: Introductionmentioning

confidence: 99%

Effect of Surface Plasma Treatments on the Adhesion of Mars JSC 1 Simulant Dust to RTV 655, RTV 615, and Sylgard 184

et al. 2012

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“…Polarization of PP is neglected and only the surface charge deposited by the corona discharge and the internal discharges are considered. It has to be taken into account that, when measuring with the electrostatic probe, the electric field in the air between the sample and the probe is zero [11]. The distribution of the internal electric field is represented in figure 8.…”

Section: Samplementioning

confidence: 99%

Relationship between surface potential and d 33 constant in cellular piezoelectric polymers

Ortega-Braña

Llovera-Segovia

Domínguez-Lagunilla

et al. 2017

Journal of Electrostatics

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The development of cellular piezoelectric polymers has shown very promising results thanks to their high d 33 piezoelectric constants which make them candidates for many applications. Cellular piezoelectric polymers, known as ferroelectrets, are obtained by means of an activation process which consists in generating an internal dipole with electrostatic charges produced by internal electric discharges. The most common system for this activation process is the application of a corona discharge on the surface of the sample in order to produce a high internal electric field. The theoretical electrostatic model of the process which is widely used is the Sessler model which relates the internal surface charge density, the air and polymer layers thickness, the dielectric permittivity of the polymer and the Young's Modulus of the cellular material to the d 33 piezoelectric constant. In our work, we relate the internal charges of the material with the d 33 piezoelectric constant by means of a surface potential scanning of cellular polypropylene biaxially stretched samples. Samples were charged by a corona discharge controlled with a triode electrode. Surface potentials were high enough to generate internal discharges and obtain measurable d 33 piezoelectric constants but low enough to be measured with spatial resolution by means of a 3kV electrostatic probe. Surface potential profiles showed some deviations from the expected bell-shape profile due to the internal electric field generated by the internal static charge. These deviations can be numerically related to the measured d 33 piezoelectric constant with the electrostatic Sessler model.

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“…The charge decay on insulating materials can be monitored and quantified by using different techniques, such as Faraday cup, and surface potential measurement techniques, such as, Kelvin Probe Force Microscopy and electrostatic probes. [27][28][29][30][31][32] The majority of papers published in the literature on polymeric materials have studied the effect of humidity on charge decay as a function of surface and volume resistivity. [33][34][35][36] It is evident that as we increase the ambient relative humidity, we increase the amount of hydronium and hydroxyl ions that are available to react as a function of the potential of hydrogen (pH).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of relative humidity on charge stability of ozone treated polystyrene particles

Jaber

Obaid

Advani

et al. 2020

J of Applied Polymer Sci

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The influence of relative humidity on charge decay on polystyrene (PS) particles is investigated at room temperature by using Faraday cup and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) spectroscopy. The PS (2.8 ± 0.4 μm in diameter) particles were charged by using an ozone setup. The ozone charging source was from the free O-radicals generated from O 3 dissociation on the surface of the PS particles resulting in carbonyl groups formation. The charge decayed exponentially, and the decay time constants were quantified using Faraday cup for various relative humidity conditions at room temperature. The charge decay due to the interaction of the PS particles with the environment was also investigated using ATR-FTIR, where the C O stretching band at 1745 cm −1 was monitored. The decay of the C O on the PS particles is due to the reaction of the carbonyl groups with the hydronium ions [H 3 O] +. The reaction of C O with [H 3 O] + is responsible for the time dependent charge decay. From both methods, the charge decay exhibited an exponential behavior, where the time decay constants measured from the two methods were in excellent correlation. The decay time constant increased linearly with increasing the RH. A generalized master charge decay curve is established for any PS surfaces (particles/films).

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Measurements of electrostatic potentials and electric fields in some industrial applications: Basic principles

Cited by 47 publications

References 7 publications

Effect of Surface Plasma Treatments on the Adhesion of Mars JSC 1 Simulant Dust to RTV 655, RTV 615, and Sylgard 184

Effect of Surface Plasma Treatments on the Adhesion of Mars JSC 1 Simulant Dust to RTV 655, RTV 615, and Sylgard 184

Relationship between surface potential and d 33 constant in cellular piezoelectric polymers

Influence of relative humidity on charge stability of ozone treated polystyrene particles

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