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Tuning Mie scattering resonances in soft materials with magnetic fields.

Physical review letters · 2013 · Unclear · Insufficient evidence

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The authors propose and experimentally demonstrate reversible tuning of Mie scattering resonances in random media using external low induction magnetic fields. In ultrasound experiments on emulsions with fluorinated ferrofluid droplets, magnetic-field-induced…

Study snapshot

PublicationPhysical review letters · 2013
Study typeengineering
Reported directionUnclear
Evidence ratingInsufficient

Abstract

An original approach is proposed here to reversibly tune Mie scattering resonances occurring in random media by means of external low induction magnetic fields. This approach is valid for both electromagnetic and acoustic waves. The experimental demonstration is supported by ultrasound experiments performed on emulsions made of fluorinated ferrofluid spherical droplets dispersed in a Bingham fluid. We show that the electromagnet-induced change of droplet shape into prolate spheroids, with a moderate aspect ratio of 2.5, drastically affects the effective properties of the disordered medium. Its effective acoustic attenuation coefficient is shown to vary by a factor of 5, by controlling both the flux density and orientation of the applied magnetic field.

Machine Enhanced Logic

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 directionunclear
PopulationNot supplied
Sample sizeNot supplied
ExposureNot supplied
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

The authors propose and experimentally demonstrate reversible tuning of Mie scattering resonances in random media using external low induction magnetic fields. In ultrasound experiments on emulsions with fluorinated ferrofluid droplets, magnetic-field-induced droplet deformation (to prolate spheroids, aspect ratio ~2.5) altered effective medium properties, with the effective acoustic attenuation coefficient varying by a factor of 5 depending on magnetic flux density and field orientation.

Outcomes measured

  • Mie scattering resonances tuning in random media
  • Droplet shape change (spherical to prolate spheroids)
  • Effective acoustic attenuation coefficient change
  • Effective properties of disordered medium

Limitations

  • No biological/health outcomes assessed (materials/physics study).
  • Magnetic field parameters (e.g., exact flux density values, frequency) not specified in the abstract.
  • Sample size and detailed experimental conditions not provided in the abstract.
View raw extracted JSON
{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "external low induction magnetic fields",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Mie scattering resonances tuning in random media",
    "Droplet shape change (spherical to prolate spheroids)",
    "Effective acoustic attenuation coefficient change",
    "Effective properties of disordered medium"
  ],
  "main_findings": "The authors propose and experimentally demonstrate reversible tuning of Mie scattering resonances in random media using external low induction magnetic fields. In ultrasound experiments on emulsions with fluorinated ferrofluid droplets, magnetic-field-induced droplet deformation (to prolate spheroids, aspect ratio ~2.5) altered effective medium properties, with the effective acoustic attenuation coefficient varying by a factor of 5 depending on magnetic flux density and field orientation.",
  "effect_direction": "unclear",
  "limitations": [
    "No biological/health outcomes assessed (materials/physics study).",
    "Magnetic field parameters (e.g., exact flux density values, frequency) not specified in the abstract.",
    "Sample size and detailed experimental conditions not provided in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "Mie scattering",
    "random media",
    "magnetic field tuning",
    "low induction magnetic fields",
    "ultrasound",
    "emulsions",
    "ferrofluid droplets",
    "Bingham fluid",
    "acoustic attenuation",
    "effective medium properties"
  ],
  "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: 10.1103/physrevlett.111.264301
PubMed: 24483797

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