Emi Shielding Through Conductive Plastics

Simon, Robert M.

doi:10.1080/03602558108067695

Cited by 159 publications

(70 citation statements)

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“…As indicated by Simon's empirical equation, absorption-based SE is strongly dependent on the composite thickness [21]. Thus, we could confirm that absorption served as a major electromagnetic interference (EMI)-shielding mechanism in the CNC-CMC@PU and CMC@PU composites.…”

Section: Resultssupporting

confidence: 52%

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Enhanced shielding effectiveness for electromagnetic wave radiation using carbon nanocoil - carbon microcoil hybrid materials

Kang¹

2017

SurfCoat Korea 2017 Conference Proceedings

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The hydrophobic-oleophilic mesh is prepared via simple and environmental friendly method by coating of encapsulation particle. The natural rubber-encapsulated silica ( NR/ SiO 2 ) can undergo the chemical reaction with fluoro-containing chemical under alkaline conditions at 6±2 °C to provide the NR/SiO 2 -encapsulated fluoroalkylsilane. Firstly, the natural rubber was encapsulated with inorganic silica shell using tetraethyl orthosilicate (TEOS) as a silica precursor. The thermal behavior of surface modified natural rubber from thermogravimetric analysis (TGA) showed the thermal stability enhancement of natural rubber after encapsulated with silica shell. The morphology of NR/SiO 2 from TEM image revealed rubber core covered by silica shell. Secondly, the process is integrated between NR/SiO 2 and fluoroalkylsilane group. The coating mesh exhibited hydrophobic-oleophilic characteristic with static water contact angle (WCA) value of 138° and oil contact angle (OCA) of 0°. The surface roughness of mesh from encapsulation particle coating was confirmed by SEM. The coating surface with these encapsulated particles, NR/SiO 2 -encapsulated with trimethoxy( 3,3,3-trifluoropropyl)silane (FAS-3) is applicable to use as coating material for oil/water separation

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Section: Resultssupporting

confidence: 52%

“…11). As indicated by Simon's empirical equation, absorption-based SE increases with increasing operating frequency [21]. Therefore, these samples apparently show behavior that is typical of an absorption-based shielding mechanism.…”

Section: Resultsmentioning

confidence: 79%

Enhanced shielding effectiveness for electromagnetic wave radiation using carbon nanocoil - carbon microcoil hybrid materials

Kang¹

2017

SurfCoat Korea 2017 Conference Proceedings

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“…Many researches indicate that the reduction of signal strength by 30 dB would be adequate for 50 % cases in the applications of automotive and computer industries. And the reduction by 40 dB would fulfill 95 % of the requirements [42]. It is clear that CNT/SMP nanocomposites are excellent shielding materials for electromagnetic interference, especially at high frequency.…”

Section: Shielding Effectiveness Of Cnt/smp Nanocompositesmentioning

confidence: 93%

Electromagnetic interference shielding effect of nanocomposites with carbon nanotube and shape memory polymer

Zhang

et al. 2007

Composites Science and Technology

279

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The nanocomposites with carbon nanotubes (CNTs) and shape memory polymer (SMP) were developed for electrical applications. The specimens with different CNTs weight fractions were prepared. Their electrical resistivities and electromagnetic interference (EMI) shielding effectiveness (SE) were investigated. The electrical resistivity was examined by four-probe method at different testing temperatures of 25, 35, 45, 55 and 65 ˚C around glass transfer temperature (T g ).As a result, for the developed nanocomposites, even lower weight fraction of CNTs could achieve a high level of conductivity and a low percolation threshold for CNTs content was confirmed. The electrical resistivity for the developed nanocomposites is dependant obviously on temperature with a linear relation like metals. The interconnected conducting network was formed more easily than other fillers. For the EMI SE measurements, a near-field antenna measurement system was used.The experiments to evaluate EMI SE were carried out in three different frequency bands, 8~26.5 GHz (K band), 33~50 GHz (Q band) and 50~75 GHz (V band). The EMI SE of CNT/SMP nanocomposites have a strong dependence of carbon nanotube content and the specimen thickness at all of three frequency bands. The higher frequency, the larger EMI SE. For the materials with 5.5wt% VGCFs both experiment and analysis will agree well, and theoretical prediction proposed for EMI SE may be useful.

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“…Considering only the reflection and the absorption effects as the main shielding mechanisms for EMI of this work, the SE of EMI for the electrically conductive polymer composites can be estimated by the empirical equation of Simon [14]: where SE is in dB, r is the volume resistivity (Wcm) at room temperature, t is the thickness of the sample (cm), f is the measurement frequency, respectively. In this equation, the combined first and second terms, namely 50 + 10log 10 (rf) −1 , shows the SE only by reflection mechanism.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the Electromagnetic Wave Shielding Effectiveness by Geometry-Controlled Carbon Coils

Kang¹,

Kim²,

Kim³

2015

MSCE

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Carbon microcoils were deposited onto Al2O3 substrates using C2H2/H2 as source gases and SF6 as an incorporated additive gas in a thermal chemical vapor deposition system. At as-grown state, the carbon coils (d-CCs) show the diverse geometry. The geometry-controlled carbon microcoils (g-CMCs) could be obtained by manipulating the injection time of SF6 in C2H2 source gas. The d-CCs with polyurethane (PU) composite (d-CC@PU) and the g-CMCs with PU composite (g-CMC@PU) were obtained by dispersing d-CCs and g-CMCs in PU, respectively. The electromagnetic wave shielding properties of d-CC@PU and g-CMC@PU composites were investigated in the frequency range of 0.25-4.0 GHz. The shielding effectiveness (SE) of d-CC@PU and g-CMC@PU composites were measured and discussed according to the weight percent of d-CCs and g-CMCs in the composites with the thickness of the composites layers. On the whole frequency range in this work, the SE of g-CMC@PU composites was higher than those of d-CC@PU composites, irrespective of the weight percent of carbon coils in the composites and the layer thickness. Furthermore, we confirmed that the absorption mechanism, instead of the reflection mechanism, seemed to play the critical role to shield the EMI for not only the g-CMC@PU composites but also the d-CC@PU composites.

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Emi Shielding Through Conductive Plastics

Cited by 159 publications

References 1 publication

Enhanced shielding effectiveness for electromagnetic wave radiation using carbon nanocoil - carbon microcoil hybrid materials

Enhanced shielding effectiveness for electromagnetic wave radiation using carbon nanocoil - carbon microcoil hybrid materials

Electromagnetic interference shielding effect of nanocomposites with carbon nanotube and shape memory polymer

Enhancement of the Electromagnetic Wave Shielding Effectiveness by Geometry-Controlled Carbon Coils

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