Tuning Mie scattering resonances in soft materials with magnetic fields.

PAPER pubmed Physical review letters 2013 Engineering / measurement Effect: unclear Evidence: Insufficient

Read original paper → DOI: 10.1103/physrevlett.111.264301 PMID: 24483797 Evidence Lab

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.

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

unclear

Population

—

Sample size

—

Exposure

external low induction magnetic fields

Evidence strength

Insufficient

Confidence: 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": 0.7399999999999999911182158029987476766109466552734375,
    "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/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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