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Magnetodeformation effects and the swelling of ferrogels in a uniform magnetic field.

Journal of physics. Condensed matter : an Institute of Physics journal · 2010 · Mixed · Insufficient evidence

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MixedInsufficient evidencePaper 3295

Gel spheres with randomly distributed magnetic particles showed a weak magnetodeformation: elongation along the field lines and compression perpendicular to the field. No magnetodeformation was observed for gels with aligned particles in the polymer matrix. T…

Study snapshot

PublicationJournal of physics. Condensed matter : an Institute of Physics journal · 2010
Study typeother
Reported directionMixed
Evidence ratingInsufficient

Abstract

Magnetic field sensitive gels (ferrogels or magnetoelastic gels) are three-dimensional cross-linked networks of flexible polymers swollen by ferrofluids or magnetic fluids. We have studied the response of magnetic field sensitive polymer gels to an external magnetic field. Two phenomena were investigated in detail: deformation and swelling under a uniform magnetic field. Gel spheres containing magnetic particles distributed randomly in the gel matrix as well as pearl chain aggregates chemically fixed in the network were exposed to a static homogeneous magnetic field. It was found that the spatial distribution of the magnetic particles plays an essential role in the magnetodeformation effect. A weak effect was observed for gels containing randomly distributed magnetic particles. In response to the magnetic field induction, these gel spheres elongated along the field lines and were compressed in the perpendicular direction. No magnetodeformation was observed for gels containing aligned particles in the polymer matrix. The influence of an external magnetic field on the equilibrium swelling degree was also the subject of this study. Using thermodynamic arguments it was shown that a uniform external field may result in deswelling of the ferrogels at high field intensities.

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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 typeother
Effect directionmixed
PopulationNot supplied
Sample sizeNot supplied
ExposureNot supplied
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Gel spheres with randomly distributed magnetic particles showed a weak magnetodeformation: elongation along the field lines and compression perpendicular to the field. No magnetodeformation was observed for gels with aligned particles in the polymer matrix. Thermodynamic arguments suggested that a uniform external field may cause deswelling of ferrogels at high field intensities.

Outcomes measured

  • gel deformation (elongation/compression) under magnetic field
  • magnetodeformation dependence on particle spatial distribution
  • equilibrium swelling degree / deswelling at high field intensities

Limitations

  • No magnetic field strength/intensity values reported in the abstract
  • No sample size or number of gel spheres/replicates reported
  • Findings are for material/gel systems rather than biological/health outcomes
  • Deswelling conclusion is described as based on thermodynamic arguments; experimental confirmation details not provided in the abstract
View raw extracted JSON
{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "static homogeneous magnetic field",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "gel deformation (elongation/compression) under magnetic field",
    "magnetodeformation dependence on particle spatial distribution",
    "equilibrium swelling degree / deswelling at high field intensities"
  ],
  "main_findings": "Gel spheres with randomly distributed magnetic particles showed a weak magnetodeformation: elongation along the field lines and compression perpendicular to the field. No magnetodeformation was observed for gels with aligned particles in the polymer matrix. Thermodynamic arguments suggested that a uniform external field may cause deswelling of ferrogels at high field intensities.",
  "effect_direction": "mixed",
  "limitations": [
    "No magnetic field strength/intensity values reported in the abstract",
    "No sample size or number of gel spheres/replicates reported",
    "Findings are for material/gel systems rather than biological/health outcomes",
    "Deswelling conclusion is described as based on thermodynamic arguments; experimental confirmation details not provided in the abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "ferrogels",
    "magnetoelastic gels",
    "magnetic particles",
    "static magnetic field",
    "uniform magnetic field",
    "magnetodeformation",
    "swelling",
    "deswelling",
    "particle distribution",
    "pearl chain aggregates"
  ],
  "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: 10.1088/0953-8984/22/27/276001
PubMed: 21399267

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