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Alignment of carbon nanotubes under low magnetic fields through attachment of magnetic nanoparticles.

The journal of physical chemistry. B · 2005 · Unclear · Insufficient evidence

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Multiwalled carbon nanotubes coated with magnetite/maghemite nanoparticles (6–10 nm) were reported to align at room temperature on substrates when deposited from aqueous solution in an external magnetic field of B = 0.2 T. The volume magnetization of particle…

Study snapshot

PublicationThe journal of physical chemistry. B · 2005
Study typeengineering
Reported directionUnclear
Evidence ratingInsufficient

Abstract

The alignment of multiwalled carbon nanotubes (MWNTs) has been accomplished through deposition of uniform layers of magnetite/maghemite nanoparticles (diameter = 6-10 nm) and use of an external magnetic field. The coating of CNTs with magnetic nanoparticles was performed by combining the polymer wrapping and layer-by-layer (LbL) assembly techniques. The particle-coated MWNTs are superparamagnetic and can be aligned at room temperature on any substrate by deposition from an aqueous solution in an external field B = 0.2 T. The volume magnetization of the particle coated MWNTs is found to be enhanced by 17% compared to the pure particles in a powder indicating that either the adsorption process onto the CNTs changes the particle magnetization, or the MWNTs carry an intrinsic magnetization due to remaining Ni used as a catalyst for the growth process.

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

Main findings

Multiwalled carbon nanotubes coated with magnetite/maghemite nanoparticles (6–10 nm) were reported to align at room temperature on substrates when deposited from aqueous solution in an external magnetic field of B = 0.2 T. The volume magnetization of particle-coated MWNTs was reported to be 17% higher than that of the pure particles in powder.

Outcomes measured

  • Alignment of multiwalled carbon nanotubes (MWNTs)
  • Volume magnetization of particle-coated MWNTs

Limitations

  • No biological/health outcomes described (materials/engineering study).
  • Sample size and experimental replication not stated in the abstract.
  • Magnetization increase mechanism is not resolved; authors propose alternative explanations (adsorption effect vs residual Ni catalyst).
View raw extracted JSON
{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "external magnetic field",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Alignment of multiwalled carbon nanotubes (MWNTs)",
    "Volume magnetization of particle-coated MWNTs"
  ],
  "main_findings": "Multiwalled carbon nanotubes coated with magnetite/maghemite nanoparticles (6–10 nm) were reported to align at room temperature on substrates when deposited from aqueous solution in an external magnetic field of B = 0.2 T. The volume magnetization of particle-coated MWNTs was reported to be 17% higher than that of the pure particles in powder.",
  "effect_direction": "unclear",
  "limitations": [
    "No biological/health outcomes described (materials/engineering study).",
    "Sample size and experimental replication not stated in the abstract.",
    "Magnetization increase mechanism is not resolved; authors propose alternative explanations (adsorption effect vs residual Ni catalyst)."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "carbon nanotubes",
    "multiwalled carbon nanotubes",
    "magnetite",
    "maghemite",
    "magnetic nanoparticles",
    "superparamagnetic",
    "alignment",
    "external magnetic field",
    "0.2 T",
    "layer-by-layer assembly",
    "polymer wrapping",
    "magnetization"
  ],
  "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: 10.1021/jp0544890
PubMed: 16853457

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