Trapping of microwave radiation in hollow polypyrrole microsphere through enhanced internal reflection: a novel approach.

Scientific reports · 2015 · Benefit · Insufficient evidence

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BenefitInsufficient evidencePaper 6583

Hollow polypyrrole (HPPy) microspheres showed higher electromagnetic interference (EMI) shielding efficiency than polypyrrole (PPy) across 0.5–8 GHz, attributed to trapping of EM waves by internal reflection. Adding silver (HPPy/Ag-10, 10 wt% Ag) further incr…

Study snapshot

PublicationScientific reports · 2015

Study typeengineering

Reported directionBenefit

Evidence ratingInsufficient

Abstract

In present work, spherical core (polystyrene, PS)/shell (polypyrrole, PPy) has been synthesized via in situ chemical oxidative copolymerization of pyrrole (Py) on the surface of sulfonated PS microsphere followed by the formation of hollow polypyrrole (HPPy) shell by dissolving PS inner core in THF. Thereafter, we first time established that such fabricated novel art of morphology acts as a conducting trap in absorbing electromagnetic (EM) wave by internal reflection. Further studies have been extended on the formation of its silver nanocomposites HPPy/Ag to strengthen our contention on this novel approach. Our investigations showed that electromagnetic interference (EMI) shielding efficiency (SE) of HPPy (34.5-6 dB) is significantly higher compared to PPy (20-5 dB) in the frequency range of 0.5-8 GHz due to the trapping of EM wave by internal reflection. We also observed that EMI shielding is further enhanced to 59-23 in 10 wt% Ag loaded HPPy/Ag-10. This is attributed to the simultaneous contribution of internal reflection as well as reflection from outer surface. Such high EMI shielding capacity using conducting polymers are rarely reported.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionbenefit

PopulationNot supplied

Sample sizeNot supplied

ExposureRF

Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

EMI shielding efficiency (SE)
Electromagnetic wave absorption/trapping via internal reflection

Limitations

No biological or health outcomes assessed (materials/engineering study).
Sample size and measurement protocol details are not provided in the abstract.

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "EMI shielding efficiency (SE)",
    "Electromagnetic wave absorption/trapping via internal reflection"
  ],
  "main_findings": "Hollow polypyrrole (HPPy) microspheres showed higher electromagnetic interference (EMI) shielding efficiency than polypyrrole (PPy) across 0.5–8 GHz, attributed to trapping of EM waves by internal reflection. Adding silver (HPPy/Ag-10, 10 wt% Ag) further increased shielding efficiency, attributed to internal reflection plus reflection from the outer surface.",
  "effect_direction": "benefit",
  "limitations": [
    "No biological or health outcomes assessed (materials/engineering study).",
    "Sample size and measurement protocol details are not provided in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "polypyrrole",
    "hollow microsphere",
    "electromagnetic interference",
    "EMI shielding",
    "internal reflection",
    "silver nanocomposite",
    "0.5-8 GHz",
    "microwave"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1038/srep07638
PubMed: 25560384

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